Hello,
syzbot found the following issue on:
HEAD commit: 32f741b0 Merge tag 'powerpc-5.10-5' of git://git.kernel.or..
git tree: upstream
console output:
https://syzkaller.appspot.com/x/log.txt?x=1747ed3d500000
kernel config:
https://syzkaller.appspot.com/x/.config?x=c949fed53798f819
dashboard link:
https://syzkaller.appspot.com/bug?extid=45a5a49112488abaad85
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+45a5a4...@syzkaller.appspotmail.com
==================================================================
BUG: KCSAN: data-race in exit_signals / prepare_signal
read-write to 0xffff8880094f2064 of 4 bytes by task 13125 on cpu 1:
exit_signals+0x102/0x530 kernel/signal.c:2846
do_exit+0x15d/0x1630 kernel/exit.c:765
do_group_exit+0xc8/0x170 kernel/exit.c:906
get_signal+0xf9b/0x1510 kernel/signal.c:2758
arch_do_signal+0x25/0x260 arch/x86/kernel/signal.c:811
exit_to_user_mode_loop kernel/entry/common.c:161 [inline]
exit_to_user_mode_prepare+0xde/0x170 kernel/entry/common.c:191
syscall_exit_to_user_mode+0x16/0x30 kernel/entry/common.c:266
do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56
entry_SYSCALL_64_after_hwframe+0x44/0xa9
read to 0xffff8880094f2064 of 4 bytes by task 8458 on cpu 0:
sig_task_ignored kernel/signal.c:94 [inline]
sig_ignored kernel/signal.c:119 [inline]
prepare_signal+0x872/0xd80 kernel/signal.c:962
__send_signal+0x64/0x780 kernel/signal.c:1082
send_signal+0x39f/0x3d0 kernel/signal.c:1242
do_send_sig_info+0x9b/0xe0 kernel/signal.c:1291
group_send_sig_info kernel/signal.c:1414 [inline]
kill_pid_info+0x7f/0x100 kernel/signal.c:1448
kill_proc_info kernel/signal.c:1465 [inline]
kill_something_info kernel/signal.c:1562 [inline]
__do_sys_kill kernel/signal.c:3664 [inline]
__se_sys_kill+0xd3/0x450 kernel/signal.c:3658
__x64_sys_kill+0x2d/0x40 kernel/signal.c:3658
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: 0 PID: 8458 Comm: syz-executor.0 Not tainted 5.10.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
---
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