diff --git a/android-changes-for-ndk-developers.md b/android-changes-for-ndk-developers.md
index 4bd97a0..0fe16bf 100644
--- a/android-changes-for-ndk-developers.md
+++ b/android-changes-for-ndk-developers.md
@@ -46,6 +46,10 @@
 [ReLinker](https://github.com/KeepSafe/ReLinker) which claims to solve
 these problems automatically.
 
+Alternatively, if you don't have too many dependencies, it can be easiest to
+simply link all of your code into one big library and sidestep the details of
+library and symbol lookup changes on all past (and future) Android versions.
+
 ## Changes to library search order
 
 We have made various fixes to library search order when resolving symbols.
diff --git a/docs/native_allocator.md b/docs/native_allocator.md
index 97c3648..2d06e2f 100644
--- a/docs/native_allocator.md
+++ b/docs/native_allocator.md
@@ -10,7 +10,7 @@
 It is important to note that there are two modes for a native allocator
 to run in on Android. The first is the normal allocator, the second is
 called the svelte config, which is designed to run on memory constrained
-systems and be a bit slower, but take less PSS. To enable the svelte config,
+systems and be a bit slower, but take less RSS. To enable the svelte config,
 add this line to the `BoardConfig.mk` for the given target:
 
     MALLOC_SVELTE := true
@@ -55,7 +55,7 @@
 When set to zero, `mallopt(M_DECAY_TIME, 0)`, it is expected that an
 allocator will attempt to purge and release any unused memory back to the
 kernel on free calls. This is important in Android to avoid consuming extra
-PSS.
+RSS.
 
 When set to non-zero, `mallopt(M_DECAY_TIME, 1)`, an allocator can delay the
 purge and release action. The amount of delay is up to the allocator
@@ -65,13 +65,13 @@
 The drawback to this option is that most allocators do not have a separate
 thread to handle the purge, so the decay is only handled when an
 allocation operation occurs. For server processes, this can mean that
-PSS is slightly higher when the server is waiting for the next connection
+RSS is slightly higher when the server is waiting for the next connection
 and no other allocation calls are made. The `M_PURGE` option is used to
 force a purge in this case.
 
 For all applications on Android, the call `mallopt(M_DECAY_TIME, 1)` is
 made by default. The idea is that it allows application frees to run a
-bit faster, while only increasing PSS a bit.
+bit faster, while only increasing RSS a bit.
 
 #### M\_PURGE
 When called, `mallopt(M_PURGE, 0)`, an allocator should purge and release
@@ -115,7 +115,7 @@
 ## Performance
 There are multiple different ways to evaluate the performance of a native
 allocator on Android. One is allocation speed in various different scenarios,
-anoher is total PSS taken by the allocator.
+another is total RSS taken by the allocator.
 
 The last is virtual address space consumed in 32 bit applications. There is
 a limited amount of address space available in 32 bit apps, and there have
@@ -129,7 +129,7 @@
     mmma -j bionic/benchmarks
 
 These benchmarks are only used to verify the speed of the allocator and
-ignore anything related to PSS and virtual address space consumed.
+ignore anything related to RSS and virtual address space consumed.
 
 #### Allocate/Free Benchmarks
 These are the benchmarks to verify the allocation speed of a loop doing a
@@ -228,7 +228,7 @@
 These numbers should be as performant as the current allocator.
 
 ### Memory Trace Benchmarks
-These benchmarks measure all three axes of a native allocator, PSS, virtual
+These benchmarks measure all three axes of a native allocator, RSS, virtual
 address space consumed, speed of allocation. They are designed to
 run on a trace of the allocations from a real world application or system
 process.
@@ -248,7 +248,7 @@
     /data/benchmarktest/trace_benchmark/trace_benchmark
 
 #### Memory Replay Benchmarks
-These benchmarks display PSS, virtual memory consumed (VA space), and do a
+These benchmarks display RSS, virtual memory consumed (VA space), and do a
 bit of performance testing on actual traces taken from running applications.
 
 The trace data includes what thread does each operation, so the replay
@@ -279,8 +279,8 @@
 
 Where XXX.txt is the name of a trace file.
 
-Every 100000 allocation operations, a dump of the PSS and VA space will be
-performed. At the end, a final PSS and VA space number will be printed.
+Every 100000 allocation operations, a dump of the RSS and VA space will be
+performed. At the end, a final RSS and VA space number will be printed.
 For the most part, the intermediate data can be ignored, but it is always
 a good idea to look over the data to verify that no strange spikes are
 occurring.
@@ -304,6 +304,14 @@
 executable, the virtual address space consumed is not much larger than the
 current allocator. A small increase (on the order of a few MBs) would be okay.
 
+There is no specific benchmark for memory fragmentation, instead, the RSS
+when running the memory traces acts as a proxy for this. An allocator that
+is fragmenting badly will show an increase in RSS. The best trace for
+tracking fragmentation is system\_server.txt which is an extremely long
+trace (~13 million operations). The total number of live allocations goes
+up and down a bit, but stays mostly the same so an allocator that fragments
+badly would likely show an abnormal increase in RSS on this trace.
+
 NOTE: When a native allocator calls mmap, it is expected that the allocator
 will name the map using the call:
 
diff --git a/docs/status.md b/docs/status.md
index 5c2f2e8..4466a3c 100644
--- a/docs/status.md
+++ b/docs/status.md
@@ -39,6 +39,9 @@
 
 New libc functions in R (API level 30):
   * Full C11 `<threads.h>` (available as inlines for older API levels).
+  * `memfd_create` and `mlock2` (GNU extensions).
+  * `renameat2` (GNU extension).
+  * `pthread_cond_clockwait`/`pthread_mutex_clocklock`/`pthread_rwlock_clockrdlock`/`pthread_rwlock_clockwrlock`/`sem_clockwait`
 
 New libc functions in Q (API level 29):
   * `timespec_get` (C11 `<time.h>` addition)
diff --git a/libc/SECCOMP_WHITELIST_COMMON.TXT b/libc/SECCOMP_WHITELIST_COMMON.TXT
index 43e7d1c..07f84a8 100644
--- a/libc/SECCOMP_WHITELIST_COMMON.TXT
+++ b/libc/SECCOMP_WHITELIST_COMMON.TXT
@@ -64,21 +64,45 @@
 int stat64:stat64(const char*, struct stat64*)  arm,x86
 ssize_t readlink:readlink(const char*, char*, size_t)  arm,x86,x86_64
 
-# Probed for and conditionally used by ART.
-int membarrier(int cmd, int flags) all
-
+#
 # Useful new syscalls which we don't yet use in bionic.
-int sched_getattr(pid_t pid, struct sched_attr* attr, unsigned int flags) all
-int sched_setattr(pid_t pid, struct sched_attr* attr, unsigned int size, unsigned int flags) all
-int memfd_create(const char* name, unsigned int flags) all
-int renameat2(int olddirfd, const char* oldpath, int newdirfd, const char* newpath, unsigned int flags)  all
-int execveat(int dirfd, const char* pathname, char* const* argv, char* const* envp, int flags)  all
-ssize_t copy_file_range(int fd_in, loff_t* off_in, int fd_out, loff_t* off_out, size_t len, unsigned int flags) all
-int mlock2(const void* addr, size_t len, int flags) all
-ssize_t preadv2(int fd, const struct iovec* iov, int iovcnt, off_t offset, int flags) all
-ssize_t pwritev2(int fd, const struct iovec* iov, int iovcnt, off_t offset, int flags) all
+#
+
+# Since Linux 2.5, not in glibc.
 int io_setup(unsigned nr, aio_context_t *ctxp) all
 int io_destroy(aio_context_t ctx) all
 int io_submit(aio_context_t ctx, long nr,  struct iocb **iocbpp) all
 int io_getevents(aio_context_t ctx, long min_nr, long max_nr, struct io_event *events, struct timespec *timeout) all
 int io_cancel(aio_context_t ctx, struct iocb *, struct io_event *result) all
+# Since Linux 3.14, not in glibc.
+int sched_getattr(pid_t pid, struct sched_attr* attr, unsigned int flags) all
+int sched_setattr(pid_t pid, struct sched_attr* attr, unsigned int size, unsigned int flags) all
+# Since Linux 3.19, not in glibc (and not really needed to implement fexecve).
+int execveat(int dirfd, const char* pathname, char* const* argv, char* const* envp, int flags)  all
+# Since Linux 4.3, not in glibc. Probed for and conditionally used by ART.
+int membarrier(int cmd, int flags) all
+# Since Linux 4.5, glibc 2.27.
+ssize_t copy_file_range(int fd_in, loff_t* off_in, int fd_out, loff_t* off_out, size_t len, unsigned int flags) all
+# Since Linux 4.6, glibc 2.26.
+ssize_t preadv2(int fd, const struct iovec* iov, int iovcnt, off_t offset, int flags) all
+ssize_t pwritev2(int fd, const struct iovec* iov, int iovcnt, off_t offset, int flags) all
+# Since Linux 4.11, glibc 2.30.
+int statx(int, const char*, int, unsigned int, statx*) all
+# Since Linux 5.1, not in glibc.
+int clock_gettime64(clockid_t, timespec64*) lp32
+int clock_settime64(clockid_t, const timespec64*) lp32
+int clock_adjtime64(clockid_t, timex64*) lp32
+int clock_getres_time64(clockid_t, timespec64*) lp32
+int clock_nanosleep_time64(clockid_t, int, const timespec64*, timespec*) lp32
+int timer_gettime64(__kernel_timer_t, itimerspec64*) lp32
+int timer_settime64(__kernel_timer_t, int, const itimerspec64*, itimerspec64*) lp32
+int timerfd_gettime64(int, itimerspec64*) lp32
+int timerfd_settime64(int, int, const itimerspec64*, itimerspec64*) lp32
+int utimensat_time64(int, const char*, const timespec64[2], int) lp32
+int pselect6_time64(int, fd_set*, fd_set*, timespec64*, void*) lp32
+int ppoll_time64(pollfd*, unsigned int, timespec64*, const sigset64_t*, size_t) lp32
+int recvmmsg_time64(int, mmsghdr*, unsigned int, int, const timespec64*) lp32
+int semtimedop_time64(int, sembuf*, size_t, const timespec64*) lp32
+int rt_sigtimedwait_time64(const sigset64_t*, siginfo_t*, const timespec64*, size_t) lp32
+int futex_time64(int*, int, int, const timespec64*, int*, int) lp32
+int sched_rr_get_interval_time64(pid_t, timespec64*) lp32
diff --git a/libc/SYSCALLS.TXT b/libc/SYSCALLS.TXT
index 99bdc93..21ebdbd 100644
--- a/libc/SYSCALLS.TXT
+++ b/libc/SYSCALLS.TXT
@@ -107,12 +107,14 @@
 
 int         __close:close(int)  all
 pid_t       __getpid:getpid()  all
+int memfd_create(const char*, unsigned) all
 int         munmap(void*, size_t)  all
 void*       __mremap:mremap(void*, size_t, size_t, int, void*)  all
 int         msync(const void*, size_t, int)    all
 int         mprotect(const void*, size_t, int)  all
 int         madvise(void*, size_t, int)  all
-int         mlock(const void* addr, size_t len)    all
+int mlock(const void* addr, size_t len)    all
+int mlock2(const void* addr, size_t len, int flags)    all
 int         munlock(const void* addr, size_t len)   all
 int         mlockall(int flags)   all
 int         munlockall()   all
@@ -151,6 +153,7 @@
 int mknodat(int, const char*, mode_t, dev_t)  all
 int readlinkat(int, const char*, char*, size_t)  all
 int renameat(int, const char*, int, const char*)  all
+int renameat2(int, const char*, int, const char*, unsigned)  all
 int symlinkat(const char*, int, const char*)  all
 int unlinkat(int, const char*, int)   all
 int utimensat(int, const char*, const struct timespec times[2], int)  all
diff --git a/libc/bionic/__cxa_guard.cpp b/libc/bionic/__cxa_guard.cpp
index 30b5f41..e2e7477 100644
--- a/libc/bionic/__cxa_guard.cpp
+++ b/libc/bionic/__cxa_guard.cpp
@@ -16,9 +16,7 @@
 
 #include <endian.h>
 #include <limits.h>
-#undef _USING_LIBCXX  // Prevent using of <atomic>.
 #include <stdatomic.h>
-
 #include <stddef.h>
 
 #include "private/bionic_futex.h"
diff --git a/libc/bionic/libc_init_dynamic.cpp b/libc/bionic/libc_init_dynamic.cpp
index 4f3b4f7..d6d5552 100644
--- a/libc/bionic/libc_init_dynamic.cpp
+++ b/libc/bionic/libc_init_dynamic.cpp
@@ -69,6 +69,13 @@
 __LIBC_HIDDEN__ void* __libc_sysinfo = reinterpret_cast<void*>(__libc_int0x80);
 #endif
 
+extern "C" __attribute__((weak)) void __hwasan_library_loaded(ElfW(Addr) base,
+                                                              const ElfW(Phdr)* phdr,
+                                                              ElfW(Half) phnum);
+extern "C" __attribute__((weak)) void __hwasan_library_unloaded(ElfW(Addr) base,
+                                                                const ElfW(Phdr)* phdr,
+                                                                ElfW(Half) phnum);
+
 // We need a helper function for __libc_preinit because compiling with LTO may
 // inline functions requiring a stack protector check, but __stack_chk_guard is
 // not initialized at the start of __libc_preinit. __libc_preinit_impl will run
@@ -91,6 +98,14 @@
 
   // Hooks for various libraries to let them know that we're starting up.
   __libc_globals.mutate(__libc_init_malloc);
+
+#if __has_feature(hwaddress_sanitizer)
+  // Notify the HWASan runtime library whenever a library is loaded or unloaded
+  // so that it can update its shadow memory.
+  __libc_shared_globals()->load_hook = __hwasan_library_loaded;
+  __libc_shared_globals()->unload_hook = __hwasan_library_unloaded;
+#endif
+
   netdClientInit();
 }
 
diff --git a/libc/include/stdio.h b/libc/include/stdio.h
index 8bd690f..6632c01 100644
--- a/libc/include/stdio.h
+++ b/libc/include/stdio.h
@@ -165,9 +165,53 @@
 char* tempnam(const char* __dir, const char* __prefix)
     __warnattr("tempnam is unsafe, use mkstemp or tmpfile instead");
 
+/**
+ * [rename(2)](http://man7.org/linux/man-pages/man2/rename.2.html) changes
+ * the name or location of a file.
+ *
+ * Returns 0 on success, and returns -1 and sets `errno` on failure.
+ */
 int rename(const char* __old_path, const char* __new_path);
+
+/**
+ * [renameat(2)](http://man7.org/linux/man-pages/man2/renameat.2.html) changes
+ * the name or location of a file, interpreting relative paths using an fd.
+ *
+ * Returns 0 on success, and returns -1 and sets `errno` on failure.
+ */
 int renameat(int __old_dir_fd, const char* __old_path, int __new_dir_fd, const char* __new_path);
 
+#if defined(__USE_GNU)
+
+/**
+ * Flag for [renameat2(2)](http://man7.org/linux/man-pages/man2/renameat2.2.html)
+ * to fail if the new path already exists.
+ */
+#define RENAME_NOREPLACE (1<<0)
+
+/**
+ * Flag for [renameat2(2)](http://man7.org/linux/man-pages/man2/renameat2.2.html)
+ * to atomically exchange the two paths.
+ */
+#define RENAME_EXCHANGE (1<<1)
+
+/**
+ * Flag for [renameat2(2)](http://man7.org/linux/man-pages/man2/renameat2.2.html)
+ * to create a union/overlay filesystem object.
+ */
+#define RENAME_WHITEOUT (1<<2)
+
+/**
+ * [renameat2(2)](http://man7.org/linux/man-pages/man2/renameat2.2.html) changes
+ * the name or location of a file, interpreting relative paths using an fd,
+ * with optional `RENAME_` flags.
+ *
+ * Returns 0 on success, and returns -1 and sets `errno` on failure.
+ */
+int renameat2(int __old_dir_fd, const char* __old_path, int __new_dir_fd, const char* __new_path, unsigned __flags) __INTRODUCED_IN(30);
+
+#endif
+
 int fseek(FILE* __fp, long __offset, int __whence);
 long ftell(FILE* __fp);
 
diff --git a/libc/include/sys/mman.h b/libc/include/sys/mman.h
index 89d6d07..3b83229 100644
--- a/libc/include/sys/mman.h
+++ b/libc/include/sys/mman.h
@@ -26,34 +26,27 @@
  * SUCH DAMAGE.
  */
 
-#ifndef _SYS_MMAN_H_
-#define _SYS_MMAN_H_
+#pragma once
 
 #include <sys/cdefs.h>
 #include <sys/types.h>
+#include <linux/memfd.h>
 #include <linux/mman.h>
 
 __BEGIN_DECLS
 
-#ifndef MAP_ANON
-#define MAP_ANON  MAP_ANONYMOUS
-#endif
+/** Alternative spelling of the `MAP_ANONYMOUS` flag for mmap(). */
+#define MAP_ANON MAP_ANONYMOUS
 
+/** Return value for mmap(). */
 #define MAP_FAILED __BIONIC_CAST(reinterpret_cast, void*, -1)
 
-#define MREMAP_MAYMOVE  1
-#define MREMAP_FIXED    2
-
-/*
- * See https://android.googlesource.com/platform/bionic/+/master/docs/32-bit-abi.md
+/**
+ * [mmap(2)](http://man7.org/linux/man-pages/man2/mmap.2.html)
+ * creates a memory mapping for the given range.
  *
- * mmap64 wasn't really around until L, but we added an inline for it since it
- * allows a lot more code to compile with _FILE_OFFSET_BITS=64.
- *
- * GCC removes the static inline unless it is explicitly used. We can get around
- * this with __attribute__((used)), but that needlessly adds a definition of
- * mmap64 to every translation unit that includes this header. Instead, just
- * preserve the old behavior for GCC and emit a useful diagnostic.
+ * Returns the address of the mapping on success,
+ * and returns `MAP_FAILED` and sets `errno` on failure.
  */
 #if defined(__USE_FILE_OFFSET64)
 void* mmap(void* __addr, size_t __size, int __prot, int __flags, int __fd, off_t __offset) __RENAME(mmap64);
@@ -62,25 +55,126 @@
 #endif
 
 #if __ANDROID_API__ >= __ANDROID_API_L__
+/**
+ * mmap64() is a variant of mmap() that takes a 64-bit offset even on LP32.
+ *
+ * See https://android.googlesource.com/platform/bionic/+/master/docs/32-bit-abi.md
+ *
+ * mmap64 wasn't really around until L, but we added an inline for it since it
+ * allows a lot more code to compile with _FILE_OFFSET_BITS=64.
+ */
 void* mmap64(void* __addr, size_t __size, int __prot, int __flags, int __fd, off64_t __offset) __INTRODUCED_IN(21);
 #endif
 
+/**
+ * [munmap(2)](http://man7.org/linux/man-pages/man2/munmap.2.html)
+ * deletes a memory mapping for the given range.
+ *
+ * Returns 0 on success, and returns -1 and sets `errno` on failure.
+ */
 int munmap(void* __addr, size_t __size);
+
+/**
+ * [msync(2)](http://man7.org/linux/man-pages/man2/msync.2.html)
+ * flushes changes to a memory-mapped file to disk.
+ *
+ * Returns 0 on success, and returns -1 and sets `errno` on failure.
+ */
 int msync(void* __addr, size_t __size, int __flags);
+
+/**
+ * [mprotect(2)](http://man7.org/linux/man-pages/man2/mprotect.2.html)
+ * sets the protection on a memory region.
+ *
+ * Returns 0 on success, and returns -1 and sets `errno` on failure.
+ */
 int mprotect(void* __addr, size_t __size, int __prot);
+
+/** Flag for mremap(). */
+#define MREMAP_MAYMOVE  1
+
+/** Flag for mremap(). */
+#define MREMAP_FIXED    2
+
+/**
+ * [mremap(2)](http://man7.org/linux/man-pages/man2/mremap.2.html)
+ * expands or shrinks an existing memory mapping.
+ *
+ * Returns the address of the mapping on success,
+ * and returns `MAP_FAILED` and sets `errno` on failure.
+ */
 void* mremap(void* __old_addr, size_t __old_size, size_t __new_size, int __flags, ...);
 
+/**
+ * [mlockall(2)](http://man7.org/linux/man-pages/man2/mlockall.2.html)
+ * locks pages (preventing swapping).
+ *
+ * Returns 0 on success, and returns -1 and sets `errno` on failure.
+ */
 int mlockall(int __flags) __INTRODUCED_IN(17);
+
+/**
+ * [munlockall(2)](http://man7.org/linux/man-pages/man2/munlockall.2.html)
+ * unlocks pages (allowing swapping).
+ *
+ * Returns 0 on success, and returns -1 and sets `errno` on failure.
+ */
 int munlockall(void) __INTRODUCED_IN(17);
 
+/**
+ * [mlock(2)](http://man7.org/linux/man-pages/man2/mlock.2.html)
+ * locks pages (preventing swapping).
+ *
+ * Returns 0 on success, and returns -1 and sets `errno` on failure.
+ */
 int mlock(const void* __addr, size_t __size);
+
+/**
+ * [mlock2(2)](http://man7.org/linux/man-pages/man2/mlock.2.html)
+ * locks pages (preventing swapping), with optional flags.
+ *
+ * Returns 0 on success, and returns -1 and sets `errno` on failure.
+ */
+int mlock2(const void* __addr, size_t __size, int __flags) __INTRODUCED_IN(30);
+
+/**
+ * [munlock(2)](http://man7.org/linux/man-pages/man2/munlock.2.html)
+ * unlocks pages (allowing swapping).
+ *
+ * Returns 0 on success, and returns -1 and sets `errno` on failure.
+ */
 int munlock(const void* __addr, size_t __size);
 
+/**
+ * [mincore(2)](http://man7.org/linux/man-pages/man2/mincore.2.html)
+ * tests whether pages are resident in memory.
+ *
+ * Returns 0 on success, and returns -1 and sets `errno` on failure.
+ */
 int mincore(void* __addr, size_t __size, unsigned char* __vector);
 
+/**
+ * [madvise(2)](http://man7.org/linux/man-pages/man2/madvise.2.html)
+ * gives the kernel advice about future usage patterns.
+ *
+ * Returns 0 on success, and returns -1 and sets `errno` on failure.
+ */
 int madvise(void* __addr, size_t __size, int __advice);
 
+#if defined(__USE_GNU)
+
+/**
+ * [memfd_create(2)](http://man7.org/linux/man-pages/man2/memfd_create.2.html)
+ * creates an anonymous file.
+ *
+ * Returns an fd on success, and returns -1 and sets `errno` on failure.
+ */
+int memfd_create(const char* __name, unsigned __flags) __INTRODUCED_IN(30);
+
+#endif
+
 #if __ANDROID_API__ >= __ANDROID_API_M__
+
 /*
  * Some third-party code uses the existence of POSIX_MADV_NORMAL to detect the
  * availability of posix_madvise. This is not correct, since having up-to-date
@@ -89,16 +183,30 @@
  *
  * https://github.com/android-ndk/ndk/issues/395
  */
+
+/** Flag for posix_madvise(). */
 #define POSIX_MADV_NORMAL     MADV_NORMAL
+/** Flag for posix_madvise(). */
 #define POSIX_MADV_RANDOM     MADV_RANDOM
+/** Flag for posix_madvise(). */
 #define POSIX_MADV_SEQUENTIAL MADV_SEQUENTIAL
+/** Flag for posix_madvise(). */
 #define POSIX_MADV_WILLNEED   MADV_WILLNEED
+/** Flag for posix_madvise(). */
 #define POSIX_MADV_DONTNEED   MADV_DONTNEED
+
 #endif
+
+/**
+ * [posix_madvise(3)](http://man7.org/linux/man-pages/man3/posix_madvise.3.html)
+ * gives the kernel advice about future usage patterns.
+ *
+ * Returns 0 on success, and returns a positive error number on failure.
+ *
+ * See also madvise() which has been available much longer.
+ */
 int posix_madvise(void* __addr, size_t __size, int __advice) __INTRODUCED_IN(23);
 
 __END_DECLS
 
 #include <android/legacy_sys_mman_inlines.h>
-
-#endif
diff --git a/libc/kernel/tools/update_all.py b/libc/kernel/tools/update_all.py
index 9d5b02d..cef24dd 100755
--- a/libc/kernel/tools/update_all.py
+++ b/libc/kernel/tools/update_all.py
@@ -110,7 +110,9 @@
         content += '  #define SYS_%s %s\n' % (syscall, nr_name)
         content += '#endif\n'
 
-    updater.editFile('%s/include/bits/glibc-syscalls.h' % libc_root, content)
+    syscall_file = os.path.join(libc_root, 'include/bits/glibc-syscalls.h')
+    updater.readFile(syscall_file)
+    updater.editFile(syscall_file, content)
 
 
 try:
diff --git a/libc/kernel/uapi/asm-x86/asm/vmx.h b/libc/kernel/uapi/asm-x86/asm/vmx.h
index 0f7ede3..83365f8 100644
--- a/libc/kernel/uapi/asm-x86/asm/vmx.h
+++ b/libc/kernel/uapi/asm-x86/asm/vmx.h
@@ -78,6 +78,5 @@
 #define VMX_EXIT_REASONS { EXIT_REASON_EXCEPTION_NMI, "EXCEPTION_NMI" }, { EXIT_REASON_EXTERNAL_INTERRUPT, "EXTERNAL_INTERRUPT" }, { EXIT_REASON_TRIPLE_FAULT, "TRIPLE_FAULT" }, { EXIT_REASON_PENDING_INTERRUPT, "PENDING_INTERRUPT" }, { EXIT_REASON_NMI_WINDOW, "NMI_WINDOW" }, { EXIT_REASON_TASK_SWITCH, "TASK_SWITCH" }, { EXIT_REASON_CPUID, "CPUID" }, { EXIT_REASON_HLT, "HLT" }, { EXIT_REASON_INVD, "INVD" }, { EXIT_REASON_INVLPG, "INVLPG" }, { EXIT_REASON_RDPMC, "RDPMC" }, { EXIT_REASON_RDTSC, "RDTSC" }, { EXIT_REASON_VMCALL, "VMCALL" }, { EXIT_REASON_VMCLEAR, "VMCLEAR" }, { EXIT_REASON_VMLAUNCH, "VMLAUNCH" }, { EXIT_REASON_VMPTRLD, "VMPTRLD" }, { EXIT_REASON_VMPTRST, "VMPTRST" }, { EXIT_REASON_VMREAD, "VMREAD" }, { EXIT_REASON_VMRESUME, "VMRESUME" }, { EXIT_REASON_VMWRITE, "VMWRITE" }, { EXIT_REASON_VMOFF, "VMOFF" }, { EXIT_REASON_VMON, "VMON" }, { EXIT_REASON_CR_ACCESS, "CR_ACCESS" }, { EXIT_REASON_DR_ACCESS, "DR_ACCESS" }, { EXIT_REASON_IO_INSTRUCTION, "IO_INSTRUCTION" }, { EXIT_REASON_MSR_READ, "MSR_READ" }, { EXIT_REASON_MSR_WRITE, "MSR_WRITE" }, { EXIT_REASON_INVALID_STATE, "INVALID_STATE" }, { EXIT_REASON_MSR_LOAD_FAIL, "MSR_LOAD_FAIL" }, { EXIT_REASON_MWAIT_INSTRUCTION, "MWAIT_INSTRUCTION" }, { EXIT_REASON_MONITOR_TRAP_FLAG, "MONITOR_TRAP_FLAG" }, { EXIT_REASON_MONITOR_INSTRUCTION, "MONITOR_INSTRUCTION" }, { EXIT_REASON_PAUSE_INSTRUCTION, "PAUSE_INSTRUCTION" }, { EXIT_REASON_MCE_DURING_VMENTRY, "MCE_DURING_VMENTRY" }, { EXIT_REASON_TPR_BELOW_THRESHOLD, "TPR_BELOW_THRESHOLD" }, { EXIT_REASON_APIC_ACCESS, "APIC_ACCESS" }, { EXIT_REASON_EOI_INDUCED, "EOI_INDUCED" }, { EXIT_REASON_GDTR_IDTR, "GDTR_IDTR" }, { EXIT_REASON_LDTR_TR, "LDTR_TR" }, { EXIT_REASON_EPT_VIOLATION, "EPT_VIOLATION" }, { EXIT_REASON_EPT_MISCONFIG, "EPT_MISCONFIG" }, { EXIT_REASON_INVEPT, "INVEPT" }, { EXIT_REASON_RDTSCP, "RDTSCP" }, { EXIT_REASON_PREEMPTION_TIMER, "PREEMPTION_TIMER" }, { EXIT_REASON_INVVPID, "INVVPID" }, { EXIT_REASON_WBINVD, "WBINVD" }, { EXIT_REASON_XSETBV, "XSETBV" }, { EXIT_REASON_APIC_WRITE, "APIC_WRITE" }, { EXIT_REASON_RDRAND, "RDRAND" }, { EXIT_REASON_INVPCID, "INVPCID" }, { EXIT_REASON_VMFUNC, "VMFUNC" }, { EXIT_REASON_ENCLS, "ENCLS" }, { EXIT_REASON_RDSEED, "RDSEED" }, { EXIT_REASON_PML_FULL, "PML_FULL" }, { EXIT_REASON_XSAVES, "XSAVES" }, { EXIT_REASON_XRSTORS, "XRSTORS" }
 #define VMX_ABORT_SAVE_GUEST_MSR_FAIL 1
 #define VMX_ABORT_LOAD_HOST_PDPTE_FAIL 2
-#define VMX_ABORT_VMCS_CORRUPTED 3
 #define VMX_ABORT_LOAD_HOST_MSR_FAIL 4
 #endif
diff --git a/libc/kernel/uapi/linux/bpf.h b/libc/kernel/uapi/linux/bpf.h
index 11df994..3f09421 100644
--- a/libc/kernel/uapi/linux/bpf.h
+++ b/libc/kernel/uapi/linux/bpf.h
@@ -548,6 +548,7 @@
   char name[BPF_OBJ_NAME_LEN];
   __u32 ifindex;
   __u32 gpl_compatible : 1;
+  __u32 : 31;
   __u64 netns_dev;
   __u64 netns_ino;
   __u32 nr_jited_ksyms;
diff --git a/libc/kernel/uapi/linux/nilfs2_ondisk.h b/libc/kernel/uapi/linux/nilfs2_ondisk.h
index e9995a1..a05e7b7 100644
--- a/libc/kernel/uapi/linux/nilfs2_ondisk.h
+++ b/libc/kernel/uapi/linux/nilfs2_ondisk.h
@@ -20,6 +20,7 @@
 #define _LINUX_NILFS2_ONDISK_H
 #include <linux/types.h>
 #include <linux/magic.h>
+#include <asm/byteorder.h>
 #define NILFS_INODE_BMAP_SIZE 7
 struct nilfs_inode {
   __le64 i_blocks;
@@ -248,11 +249,11 @@
   NILFS_CHECKPOINT_MINOR,
 };
 #define NILFS_CHECKPOINT_FNS(flag,name) static inline void nilfs_checkpoint_set_ ##name(struct nilfs_checkpoint * cp) \
-{ cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) | (1UL << NILFS_CHECKPOINT_ ##flag)); \
+{ cp->cp_flags = __cpu_to_le32(__le32_to_cpu(cp->cp_flags) | (1UL << NILFS_CHECKPOINT_ ##flag)); \
 } static inline void nilfs_checkpoint_clear_ ##name(struct nilfs_checkpoint * cp) \
-{ cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) & ~(1UL << NILFS_CHECKPOINT_ ##flag)); \
+{ cp->cp_flags = __cpu_to_le32(__le32_to_cpu(cp->cp_flags) & ~(1UL << NILFS_CHECKPOINT_ ##flag)); \
 } static inline int nilfs_checkpoint_ ##name(const struct nilfs_checkpoint * cp) \
-{ return ! ! (le32_to_cpu(cp->cp_flags) & (1UL << NILFS_CHECKPOINT_ ##flag)); \
+{ return ! ! (__le32_to_cpu(cp->cp_flags) & (1UL << NILFS_CHECKPOINT_ ##flag)); \
 }
 struct nilfs_cpfile_header {
   __le64 ch_ncheckpoints;
@@ -272,11 +273,11 @@
   NILFS_SEGMENT_USAGE_ERROR,
 };
 #define NILFS_SEGMENT_USAGE_FNS(flag,name) static inline void nilfs_segment_usage_set_ ##name(struct nilfs_segment_usage * su) \
-{ su->su_flags = cpu_to_le32(le32_to_cpu(su->su_flags) | (1UL << NILFS_SEGMENT_USAGE_ ##flag)); \
+{ su->su_flags = __cpu_to_le32(__le32_to_cpu(su->su_flags) | (1UL << NILFS_SEGMENT_USAGE_ ##flag)); \
 } static inline void nilfs_segment_usage_clear_ ##name(struct nilfs_segment_usage * su) \
-{ su->su_flags = cpu_to_le32(le32_to_cpu(su->su_flags) & ~(1UL << NILFS_SEGMENT_USAGE_ ##flag)); \
+{ su->su_flags = __cpu_to_le32(__le32_to_cpu(su->su_flags) & ~(1UL << NILFS_SEGMENT_USAGE_ ##flag)); \
 } static inline int nilfs_segment_usage_ ##name(const struct nilfs_segment_usage * su) \
-{ return ! ! (le32_to_cpu(su->su_flags) & (1UL << NILFS_SEGMENT_USAGE_ ##flag)); \
+{ return ! ! (__le32_to_cpu(su->su_flags) & (1UL << NILFS_SEGMENT_USAGE_ ##flag)); \
 }
 struct nilfs_sufile_header {
   __le64 sh_ncleansegs;
diff --git a/libc/kernel/uapi/linux/version.h b/libc/kernel/uapi/linux/version.h
index 815f53d..94bf4ba 100644
--- a/libc/kernel/uapi/linux/version.h
+++ b/libc/kernel/uapi/linux/version.h
@@ -16,5 +16,5 @@
  ***
  ****************************************************************************
  ****************************************************************************/
-#define LINUX_VERSION_CODE 328192
+#define LINUX_VERSION_CODE 328198
 #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
diff --git a/libc/kernel/uapi/linux/videodev2.h b/libc/kernel/uapi/linux/videodev2.h
index e6df45c..f77c6bd 100644
--- a/libc/kernel/uapi/linux/videodev2.h
+++ b/libc/kernel/uapi/linux/videodev2.h
@@ -210,7 +210,7 @@
 #define V4L2_PIX_FMT_RGBX444 v4l2_fourcc('R', 'X', '1', '2')
 #define V4L2_PIX_FMT_ABGR444 v4l2_fourcc('A', 'B', '1', '2')
 #define V4L2_PIX_FMT_XBGR444 v4l2_fourcc('X', 'B', '1', '2')
-#define V4L2_PIX_FMT_BGRA444 v4l2_fourcc('B', 'A', '1', '2')
+#define V4L2_PIX_FMT_BGRA444 v4l2_fourcc('G', 'A', '1', '2')
 #define V4L2_PIX_FMT_BGRX444 v4l2_fourcc('B', 'X', '1', '2')
 #define V4L2_PIX_FMT_RGB555 v4l2_fourcc('R', 'G', 'B', 'O')
 #define V4L2_PIX_FMT_ARGB555 v4l2_fourcc('A', 'R', '1', '5')
diff --git a/libc/libc.map.txt b/libc/libc.map.txt
index 0cab83d..9b39bb8 100644
--- a/libc/libc.map.txt
+++ b/libc/libc.map.txt
@@ -1493,6 +1493,8 @@
     cnd_signal;
     cnd_timedwait;
     cnd_wait;
+    memfd_create;
+    mlock2;
     mtx_destroy;
     mtx_init;
     mtx_lock;
@@ -1503,6 +1505,7 @@
     pthread_mutex_clocklock;
     pthread_rwlock_clockrdlock;
     pthread_rwlock_clockwrlock;
+    renameat2;
     sem_clockwait;
     thrd_create;
     thrd_current;
diff --git a/libc/private/bionic_globals.h b/libc/private/bionic_globals.h
index d73079e..ef735ba 100644
--- a/libc/private/bionic_globals.h
+++ b/libc/private/bionic_globals.h
@@ -88,6 +88,10 @@
   TlsModules tls_modules;
   BionicAllocator tls_allocator;
 
+  // Values passed from the HWASan runtime (via libc.so) to the loader.
+  void (*load_hook)(ElfW(Addr) base, const ElfW(Phdr)* phdr, ElfW(Half) phnum) = nullptr;
+  void (*unload_hook)(ElfW(Addr) base, const ElfW(Phdr)* phdr, ElfW(Half) phnum) = nullptr;
+
   // Values passed from the linker to libc.so.
   const char* init_progname = nullptr;
   char** init_environ = nullptr;
diff --git a/linker/Android.bp b/linker/Android.bp
index 5e7a921..bdb7c17 100644
--- a/linker/Android.bp
+++ b/linker/Android.bp
@@ -177,11 +177,6 @@
         "-Wextra",
         "-Wunused",
         "-Werror",
-
-        // Define _USING_LIBCXX so <stdatomic.h> defers to the <atomic> header. When a Soong module
-        // uses the platform libc++, Soong automatically passes this macro, but the dynamic linker
-        // links against libc++ manually.
-        "-D_USING_LIBCXX",
     ],
 
     // TODO: split out the asflags.
diff --git a/linker/ld.config.format.md b/linker/ld.config.format.md
index faf5cc8..f9fbcde 100644
--- a/linker/ld.config.format.md
+++ b/linker/ld.config.format.md
@@ -25,7 +25,7 @@
 ## Example
 
 ```
-# The following line maps section to a dir. Binraies ran from this location will use namespaces
+# The following line maps section to a dir. Binaries ran from this location will use namespaces
 # configuration specified in [example_section] below
 dir.example_section=/system/bin/example
 
@@ -38,7 +38,7 @@
 # default value is false
 enable.target.sdk.version = true
 
-# This property can be used to declare additional namespaces.Note that there is always the default
+# This property can be used to declare additional namespaces. Note that there is always the default
 # namespace. The default namespace is the namespace for the main executable. This list is
 # comma-separated.
 additional.namespaces = ns1
@@ -65,7 +65,7 @@
 # This declares linked namespaces - comma separated list.
 namespace.default.links = ns1
 
-# For every link define list of shared libraries. This is list of the libraries accessilbe from
+# For every link define list of shared libraries. This is list of the libraries accessible from
 # default namespace but loaded in the linked namespace.
 namespace.default.link.ns1.shared_libs = libexternal.so:libother.so
 
diff --git a/linker/linker.cpp b/linker/linker.cpp
index df7dd40..0361a8a 100644
--- a/linker/linker.cpp
+++ b/linker/linker.cpp
@@ -1905,6 +1905,9 @@
             !get_cfi_shadow()->AfterLoad(si, solist_get_head())) {
           return false;
         }
+        if (__libc_shared_globals()->load_hook) {
+          __libc_shared_globals()->load_hook(si->load_bias, si->phdr, si->phnum);
+        }
       }
 
       return true;
@@ -2039,6 +2042,9 @@
            si);
     notify_gdb_of_unload(si);
     unregister_soinfo_tls(si);
+    if (__libc_shared_globals()->unload_hook) {
+      __libc_shared_globals()->unload_hook(si->load_bias, si->phdr, si->phnum);
+    }
     get_cfi_shadow()->BeforeUnload(si);
     soinfo_free(si);
   }
diff --git a/tests/dlext_test.cpp b/tests/dlext_test.cpp
index 67ebf37..59cf2f7 100644
--- a/tests/dlext_test.cpp
+++ b/tests/dlext_test.cpp
@@ -29,9 +29,7 @@
 #include <android-base/file.h>
 #include <android-base/strings.h>
 
-#include <linux/memfd.h>
 #include <sys/mman.h>
-#include <sys/syscall.h>
 #include <sys/types.h>
 #include <sys/vfs.h>
 #include <sys/wait.h>
@@ -942,7 +940,7 @@
   const std::string lib_path = GetTestlibRoot() + "/libtest_simple.so";
 
   // create memfd
-  int memfd = syscall(__NR_memfd_create, "foobar", MFD_CLOEXEC);
+  int memfd = memfd_create("foobar", MFD_CLOEXEC);
   if (memfd == -1 && errno == ENOSYS) {
     return;
   }
diff --git a/tests/stdio_test.cpp b/tests/stdio_test.cpp
index 01b4dba..a0cda1b 100644
--- a/tests/stdio_test.cpp
+++ b/tests/stdio_test.cpp
@@ -19,7 +19,6 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
-#include <linux/fs.h>
 #include <math.h>
 #include <stdio.h>
 #include <sys/types.h>
@@ -34,10 +33,18 @@
 #include <vector>
 
 #include <android-base/file.h>
+#include <android-base/unique_fd.h>
 
 #include "BionicDeathTest.h"
 #include "utils.h"
 
+// This #include is actually a test too. We have to duplicate the
+// definitions of the RENAME_ constants because <linux/fs.h> also contains
+// pollution such as BLOCK_SIZE which conflicts with lots of user code.
+// Important to check that we have matching definitions.
+// There's no _MAX to test that we have all the constants, sadly.
+#include <linux/fs.h>
+
 #if defined(NOFORTIFY)
 #define STDIO_TEST stdio_nofortify
 #define STDIO_DEATHTEST stdio_nofortify_DeathTest
@@ -2610,3 +2617,77 @@
   // So we'll notice if Linux grows another constant in <linux/fs.h>...
   ASSERT_EQ(SEEK_MAX, SEEK_HOLE);
 }
+
+TEST(STDIO_TEST, rename) {
+  TemporaryDir td;
+  std::string old_path = td.path + "/old"s;
+  std::string new_path = td.path + "/new"s;
+
+  // Create the file, check it exists.
+  ASSERT_EQ(0, close(creat(old_path.c_str(), 0666)));
+  struct stat sb;
+  ASSERT_EQ(0, stat(old_path.c_str(), &sb));
+  ASSERT_EQ(-1, stat(new_path.c_str(), &sb));
+
+  // Rename and check it moved.
+  ASSERT_EQ(0, rename(old_path.c_str(), new_path.c_str()));
+  ASSERT_EQ(-1, stat(old_path.c_str(), &sb));
+  ASSERT_EQ(0, stat(new_path.c_str(), &sb));
+}
+
+TEST(STDIO_TEST, renameat) {
+  TemporaryDir td;
+  android::base::unique_fd dirfd{open(td.path, O_PATH)};
+  std::string old_path = td.path + "/old"s;
+  std::string new_path = td.path + "/new"s;
+
+  // Create the file, check it exists.
+  ASSERT_EQ(0, close(creat(old_path.c_str(), 0666)));
+  struct stat sb;
+  ASSERT_EQ(0, stat(old_path.c_str(), &sb));
+  ASSERT_EQ(-1, stat(new_path.c_str(), &sb));
+
+  // Rename and check it moved.
+  ASSERT_EQ(0, renameat(dirfd, "old", dirfd, "new"));
+  ASSERT_EQ(-1, stat(old_path.c_str(), &sb));
+  ASSERT_EQ(0, stat(new_path.c_str(), &sb));
+}
+
+TEST(STDIO_TEST, renameat2) {
+#if defined(__GLIBC__)
+  GTEST_SKIP() << "glibc doesn't have renameat2 until 2.28";
+#else
+  TemporaryDir td;
+  android::base::unique_fd dirfd{open(td.path, O_PATH)};
+  std::string old_path = td.path + "/old"s;
+  std::string new_path = td.path + "/new"s;
+
+  // Create the file, check it exists.
+  ASSERT_EQ(0, close(creat(old_path.c_str(), 0666)));
+  struct stat sb;
+  ASSERT_EQ(0, stat(old_path.c_str(), &sb));
+  ASSERT_EQ(-1, stat(new_path.c_str(), &sb));
+
+  // Rename and check it moved.
+  ASSERT_EQ(0, renameat2(dirfd, "old", dirfd, "new", 0));
+  ASSERT_EQ(-1, stat(old_path.c_str(), &sb));
+  ASSERT_EQ(0, stat(new_path.c_str(), &sb));
+
+  // After this, both "old" and "new" exist.
+  ASSERT_EQ(0, close(creat(old_path.c_str(), 0666)));
+
+  // Rename and check it moved.
+  ASSERT_EQ(-1, renameat2(dirfd, "old", dirfd, "new", RENAME_NOREPLACE));
+  ASSERT_EQ(EEXIST, errno);
+#endif
+}
+
+TEST(STDIO_TEST, renameat2_flags) {
+#if defined(__GLIBC__)
+  GTEST_SKIP() << "glibc doesn't have renameat2 until 2.28";
+#else
+ ASSERT_NE(0, RENAME_EXCHANGE);
+ ASSERT_NE(0, RENAME_NOREPLACE);
+ ASSERT_NE(0, RENAME_WHITEOUT);
+#endif
+}
diff --git a/tests/sys_mman_test.cpp b/tests/sys_mman_test.cpp
index 0b98198..e403ea5 100644
--- a/tests/sys_mman_test.cpp
+++ b/tests/sys_mman_test.cpp
@@ -230,7 +230,10 @@
 TEST(sys_mman, mremap_PTRDIFF_MAX) {
   void* map = mmap(nullptr, PAGE_SIZE, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
   ASSERT_NE(MAP_FAILED, map);
+
   ASSERT_EQ(MAP_FAILED, mremap(map, PAGE_SIZE, kHuge, MREMAP_MAYMOVE));
+
+  ASSERT_EQ(0, munmap(map, PAGE_SIZE));
 }
 
 TEST(sys_mman, mmap_bug_27265969) {
@@ -239,3 +242,61 @@
   // Some kernels had bugs that would cause segfaults here...
   __builtin___clear_cache(base, base + (PAGE_SIZE * 2));
 }
+
+TEST(sys_mman, mlock) {
+  void* map = mmap(nullptr, PAGE_SIZE, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+  ASSERT_NE(MAP_FAILED, map);
+
+  // Not really anything we can assert about this.
+  mlock(map, PAGE_SIZE);
+
+  ASSERT_EQ(0, munmap(map, PAGE_SIZE));
+}
+
+TEST(sys_mman, mlock2) {
+#if defined(__GLIBC__)
+  GTEST_SKIP() << "needs glibc 2.27";
+#else
+  void* map = mmap(nullptr, PAGE_SIZE, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+  ASSERT_NE(MAP_FAILED, map);
+
+  // Not really anything we can assert about this.
+  mlock2(map, PAGE_SIZE, MLOCK_ONFAULT);
+
+  ASSERT_EQ(0, munmap(map, PAGE_SIZE));
+#endif
+}
+
+TEST(sys_mman, memfd_create) {
+#if defined(__GLIBC__)
+  GTEST_SKIP() << "needs glibc 2.27";
+#else
+  // Is the MFD_CLOEXEC flag obeyed?
+  errno = 0;
+  int fd = memfd_create("doesn't matter", 0);
+  if (fd == -1) {
+    ASSERT_EQ(ENOSYS, errno);
+    GTEST_SKIP() << "no memfd_create available";
+  }
+  int f = fcntl(fd, F_GETFD);
+  ASSERT_NE(-1, f);
+  ASSERT_FALSE(f & FD_CLOEXEC);
+  close(fd);
+
+  errno = 0;
+  fd = memfd_create("doesn't matter", MFD_CLOEXEC);
+  f = fcntl(fd, F_GETFD);
+  ASSERT_NE(-1, f);
+  ASSERT_TRUE(f & FD_CLOEXEC);
+
+  // Can we read and write?
+  std::string expected("hello, world!");
+  ASSERT_TRUE(android::base::WriteStringToFd(expected, fd));
+  ASSERT_EQ(0, lseek(fd, 0, SEEK_SET));
+  std::string actual;
+  ASSERT_TRUE(android::base::ReadFdToString(fd, &actual));
+  ASSERT_EQ(expected, actual);
+
+  close(fd);
+#endif
+}