# git rev-parse -q --verify 353f7988dd8413c47718f7ca79c030b6fb62cfe5^{commit}
353f7988dd8413c47718f7ca79c030b6fb62cfe5
already have revision, skipping fetch
# git checkout -q -f -B kisskb 353f7988dd8413c47718f7ca79c030b6fb62cfe5
# git clean -qxdf
# < git log -1
# commit 353f7988dd8413c47718f7ca79c030b6fb62cfe5
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Tue Jul 19 11:09:01 2022 -0700
# 
#     watchqueue: make sure to serialize 'wqueue->defunct' properly
#     
#     When the pipe is closed, we mark the associated watchqueue defunct by
#     calling watch_queue_clear().  However, while that is protected by the
#     watchqueue lock, new watchqueue entries aren't actually added under that
#     lock at all: they use the pipe->rd_wait.lock instead, and looking up
#     that pipe happens without any locking.
#     
#     The watchqueue code uses the RCU read-side section to make sure that the
#     wqueue entry itself hasn't disappeared, but that does not protect the
#     pipe_info in any way.
#     
#     So make sure to actually hold the wqueue lock when posting watch events,
#     properly serializing against the pipe being torn down.
#     
#     Reported-by: Noam Rathaus <noamr@ssd-disclosure.com>
#     Cc: Greg KH <gregkh@linuxfoundation.org>
#     Cc: David Howells <dhowells@redhat.com>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/korg/gcc-11.1.0-nolibc/x86_64-linux/bin/x86_64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-11.1.0-nolibc/x86_64-linux/bin/x86_64-linux-ld --version
# < git log --format=%s --max-count=1 353f7988dd8413c47718f7ca79c030b6fb62cfe5
# < make -s -j 32 ARCH=x86 O=/kisskb/build/linus_x86-allmodconfig_x86_64-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/x86_64-linux/bin/x86_64-linux-  allmodconfig
# Added to kconfig CONFIG_BUILD_DOCSRC=n
# Added to kconfig CONFIG_MODULE_SIG=n
# Added to kconfig CONFIG_SAMPLES=n
# < make -s -j 32 ARCH=x86 O=/kisskb/build/linus_x86-allmodconfig_x86_64-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/x86_64-linux/bin/x86_64-linux-  help
# make -s -j 32 ARCH=x86 O=/kisskb/build/linus_x86-allmodconfig_x86_64-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/x86_64-linux/bin/x86_64-linux-  olddefconfig
# make -s -j 32 ARCH=x86 O=/kisskb/build/linus_x86-allmodconfig_x86_64-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/x86_64-linux/bin/x86_64-linux-  
Completed OK
# rm -rf /kisskb/build/linus_x86-allmodconfig_x86_64-gcc11
# Build took: 0:39:10.050284