Hello,
syzbot found the following issue on:
HEAD commit: 3d5e28bf Merge branch 'stable/for-linus-5.10-rc2' of git:/..
git tree: upstream
console output:
https://syzkaller.appspot.com/x/log.txt?x=1560c906500000
kernel config:
https://syzkaller.appspot.com/x/.config?x=671e27f23e60a67b
dashboard link:
https://syzkaller.appspot.com/bug?extid=66ebc4dba60062669bed
compiler: clang version 12.0.0 (
https://github.com/llvm/llvm-project.git 913f6005669cfb590c99865a90bc51ed0983d09d)
CC: [
ax...@kernel.dk chri...@brauner.io ebie...@xmission.com linux-...@vger.kernel.org liuzhi...@huawei.com ol...@redhat.com]
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+66ebc4...@syzkaller.appspotmail.com
==================================================================
BUG: KCSAN: data-race in exit_signals / mm_update_next_owner
read-write to 0xffff88810721e024 of 4 bytes by task 18048 on cpu 0:
exit_signals+0x108/0x530 kernel/signal.c:2846
do_exit+0x158/0x15a0 kernel/exit.c:765
do_group_exit+0x16f/0x170 kernel/exit.c:906
__do_sys_exit_group+0xb/0x10 kernel/exit.c:917
__se_sys_exit_group+0x5/0x10 kernel/exit.c:915
__x64_sys_exit_group+0x16/0x20 kernel/exit.c:915
do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
read to 0xffff88810721e024 of 4 bytes by task 18049 on cpu 1:
mm_update_next_owner+0x1e9/0x4c0 kernel/exit.c:387
exit_mm+0x2ff/0x370 kernel/exit.c:485
do_exit+0x3c2/0x15a0 kernel/exit.c:796
do_group_exit+0x16f/0x170 kernel/exit.c:906
__do_sys_exit_group+0xb/0x10 kernel/exit.c:917
__se_sys_exit_group+0x5/0x10 kernel/exit.c:915
__x64_sys_exit_group+0x16/0x20 kernel/exit.c:915
do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 18049 Comm: syz-executor.4 Not tainted 5.10.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
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