Buildresult: linus/mips-allnoconfig/mips-gcc4.9 built on Jul 17 2021, 19:57

kisskb

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Status:	OK
Date/Time:	Jul 17 2021, 19:57
Duration:	0:00:24.740795
Builder:	ka2
Revision:	coredump: Limit what can interrupt coredumps (`06af8679449d4ed282df13191fc52d5ba28ec536)`
Target:	linus/mips-allnoconfig/mips-gcc4.9
Branch:	linus
Compiler:	mips-gcc4.9 (mips-linux-gcc (GCC) 4.9.4 / GNU ld (GNU Binutils) 2.29.1.20170915)
Config:	allnoconfig (download)
Log:	Download original No warnings found in log. Full Log # git rev-parse -q --verify 06af8679449d4ed282df13191fc52d5ba28ec536^{commit} 06af8679449d4ed282df13191fc52d5ba28ec536 already have revision, skipping fetch # git checkout -q -f -B kisskb 06af8679449d4ed282df13191fc52d5ba28ec536 # git clean -qxdf # < git log -1 # commit 06af8679449d4ed282df13191fc52d5ba28ec536 # Author: Eric W. Biederman <ebiederm@xmission.com> # Date: Thu Jun 10 15:11:11 2021 -0500 # # coredump: Limit what can interrupt coredumps # # Olivier Langlois has been struggling with coredumps being incompletely written in # processes using io_uring. # # Olivier Langlois <olivier@trillion01.com> writes: # > io_uring is a big user of task_work and any event that io_uring made a # > task waiting for that occurs during the core dump generation will # > generate a TIF_NOTIFY_SIGNAL. # > # > Here are the detailed steps of the problem: # > 1. io_uring calls vfs_poll() to install a task to a file wait queue # > with io_async_wake() as the wakeup function cb from io_arm_poll_handler() # > 2. wakeup function ends up calling task_work_add() with TWA_SIGNAL # > 3. task_work_add() sets the TIF_NOTIFY_SIGNAL bit by calling # > set_notify_signal() # # The coredump code deliberately supports being interrupted by SIGKILL, # and depends upon prepare_signal to filter out all other signals. Now # that signal_pending includes wake ups for TIF_NOTIFY_SIGNAL this hack # in dump_emitted by the coredump code no longer works. # # Make the coredump code more robust by explicitly testing for all of # the wakeup conditions the coredump code supports. This prevents # new wakeup conditions from breaking the coredump code, as well # as fixing the current issue. # # The filesystem code that the coredump code uses already limits # itself to only aborting on fatal_signal_pending. So it should # not develop surprising wake-up reasons either. # # v2: Don't remove the now unnecessary code in prepare_signal. # # Cc: stable@vger.kernel.org # Fixes: 12db8b690010 ("entry: Add support for TIF_NOTIFY_SIGNAL") # Reported-by: Olivier Langlois <olivier@trillion01.com> # Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> # Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> # < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/mips-linux/bin/mips-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/mips-linux/bin/mips-linux-ld --version # < git log --format=%s --max-count=1 06af8679449d4ed282df13191fc52d5ba28ec536 # < make -s -j 24 ARCH=mips O=/kisskb/build/linus_mips-allnoconfig_mips-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/mips-linux/bin/mips-linux- allnoconfig # < make -s -j 24 ARCH=mips O=/kisskb/build/linus_mips-allnoconfig_mips-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/mips-linux/bin/mips-linux- help # make -s -j 24 ARCH=mips O=/kisskb/build/linus_mips-allnoconfig_mips-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/mips-linux/bin/mips-linux- olddefconfig # make -s -j 24 ARCH=mips O=/kisskb/build/linus_mips-allnoconfig_mips-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/mips-linux/bin/mips-linux- FIT description: Linux 5.13.0-rc5+ Created: Sat Jul 17 19:58:15 2021 Image 0 (kernel) Description: Linux 5.13.0-rc5+ Created: Sat Jul 17 19:58:15 2021 Type: Kernel Image Compression: gzip compressed Data Size: 1304016 Bytes = 1273.45 KiB = 1.24 MiB Architecture: MIPS OS: Linux Load Address: 0x80100000 Entry Point: 0x80320b8c Hash algo: sha1 Hash value: c796c00aebda9e9e11ba625a7d819477d40b870b Default Configuration: 'conf-default' Configuration 0 (conf-default) Description: Generic Linux kernel Kernel: kernel Completed OK # rm -rf /kisskb/build/linus_mips-allnoconfig_mips-gcc4.9 # Build took: 0:00:24.740795

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