From: syzbot <syzbot+e75157f5b04f8ff40e17@syzkaller.appspotmail.com>
To: acme@kernel.org, adrian.hunter@intel.com,
alexander.shishkin@linux.intel.com, irogers@google.com,
jolsa@kernel.org, kan.liang@linux.intel.com,
linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
mark.rutland@arm.com, mingo@redhat.com, namhyung@kernel.org,
peterz@infradead.org, syzkaller-bugs@googlegroups.com
Subject: [syzbot] [perf?] KCSAN: data-race in _free_event / perf_pending_task (2)
Date: Sun, 13 Oct 2024 23:09:25 -0700 [thread overview]
Message-ID: <670cb595.050a0220.4cbc0.0043.GAE@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: 87d6aab2389e Merge tag 'for_linus' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10104f9f980000
kernel config: https://syzkaller.appspot.com/x/.config?x=a2f7ae2f221e9eae
dashboard link: https://syzkaller.appspot.com/bug?extid=e75157f5b04f8ff40e17
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/cce40536bdc3/disk-87d6aab2.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/479edc06c8d8/vmlinux-87d6aab2.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9d377c65ffca/bzImage-87d6aab2.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e75157f5b04f8ff40e17@syzkaller.appspotmail.com
==================================================================
BUG: KCSAN: data-race in _free_event / perf_pending_task
write to 0xffff8881155361e8 of 4 bytes by task 9574 on cpu 1:
perf_pending_task+0xe8/0x220 kernel/events/core.c:6976
task_work_run+0x13a/0x1a0 kernel/task_work.c:228
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0xbe/0x130 kernel/entry/common.c:218
do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
read to 0xffff8881155361e8 of 4 bytes by task 9573 on cpu 0:
perf_pending_task_sync kernel/events/core.c:5302 [inline]
_free_event+0x3d/0xa10 kernel/events/core.c:5326
put_event kernel/events/core.c:5454 [inline]
perf_event_release_kernel+0x61a/0x670 kernel/events/core.c:5579
perf_release+0x1f/0x30 kernel/events/core.c:5589
__fput+0x17a/0x6d0 fs/file_table.c:431
____fput+0x1c/0x30 fs/file_table.c:459
task_work_run+0x13a/0x1a0 kernel/task_work.c:228
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0xbe/0x130 kernel/entry/common.c:218
do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
value changed: 0x7ad100bf -> 0x00000000
Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 9573 Comm: syz.3.2265 Tainted: G W 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
==================================================================
---
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next reply other threads:[~2024-10-14 6:09 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-14 6:09 syzbot [this message]
2024-10-14 8:30 ` [syzbot] [perf?] KCSAN: data-race in _free_event / perf_pending_task (2) Dmitry Vyukov
2024-10-14 9:40 ` Marco Elver
2024-10-14 10:30 ` Dmitry Vyukov
2024-10-14 12:42 ` Marco Elver
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