linux-kernel - Re: [syzbot] [perf?] [trace?] KCSAN: assert: race in srcu_gp_start_if

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Message-ID: <CANpmjNMQ7ZVG0i9j1K7J0yKrtfrFfHi6kXaA7FLKmX5T4yWXTw@mail.gmail.com>
Date: Sun, 24 Nov 2024 23:48:46 +0100
From: Marco Elver <elver@...gle.com>
To: syzbot <syzbot+16a19b06125a2963eaee@...kaller.appspotmail.com>
Cc: acme@...nel.org, adrian.hunter@...el.com, 
	alexander.shishkin@...ux.intel.com, irogers@...gle.com, jolsa@...nel.org, 
	kan.liang@...ux.intel.com, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org, linux-trace-kernel@...r.kernel.org, 
	mark.rutland@....com, mhiramat@...nel.org, mingo@...hat.com, 
	namhyung@...nel.org, oleg@...hat.com, peterz@...radead.org, 
	syzkaller-bugs@...glegroups.com, RCU <rcu@...r.kernel.org>, 
	"Paul E. McKenney" <paulmck@...nel.org>
Subject: Re: [syzbot] [perf?] [trace?] KCSAN: assert: race in srcu_gp_start_if_needed

+Cc RCU

On Sun, 24 Nov 2024 at 23:47, syzbot
<syzbot+16a19b06125a2963eaee@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    42d9e8b7ccdd Merge tag 'powerpc-6.13-1' of git://git.kerne..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=10a00778580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=3d7fd5be0e73b8b
> dashboard link: https://syzkaller.appspot.com/bug?extid=16a19b06125a2963eaee
> 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/ef231513adc7/disk-42d9e8b7.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/54caaac5960b/vmlinux-42d9e8b7.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/85b5a6566143/bzImage-42d9e8b7.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+16a19b06125a2963eaee@...kaller.appspotmail.com
>
> ==================================================================
> BUG: KCSAN: assert: race in srcu_get_delay kernel/rcu/srcutree.c:658 [inline]
> BUG: KCSAN: assert: race in srcu_funnel_gp_start kernel/rcu/srcutree.c:1089 [inline]
> BUG: KCSAN: assert: race in srcu_gp_start_if_needed+0x808/0x9f0 kernel/rcu/srcutree.c:1339
>
> race at unknown origin, with assert no writes to 0xffffffff8676ffc8 of 8 bytes by task 6285 on cpu 0:
>  srcu_get_delay kernel/rcu/srcutree.c:658 [inline]
>  srcu_funnel_gp_start kernel/rcu/srcutree.c:1089 [inline]
>  srcu_gp_start_if_needed+0x808/0x9f0 kernel/rcu/srcutree.c:1339
>  __call_srcu kernel/rcu/srcutree.c:1384 [inline]
>  __synchronize_srcu+0x114/0x150 kernel/rcu/srcutree.c:1432
>  synchronize_srcu+0x1ae/0x1d0
>  uprobe_unregister_sync+0x1a/0x20 kernel/events/uprobes.c:1328
>  __probe_event_disable kernel/trace/trace_uprobe.c:1138 [inline]
>  probe_event_disable+0x1f5/0x240 kernel/trace/trace_uprobe.c:1222
>  trace_uprobe_register+0xbb/0x3c0 kernel/trace/trace_uprobe.c:1512
>  perf_trace_event_unreg+0x6c/0x1a0 kernel/trace/trace_event_perf.c:162
>  perf_uprobe_destroy+0x6a/0xf0 kernel/trace/trace_event_perf.c:345
>  _free_event+0x7ca/0xa10 kernel/events/core.c:5357
>  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:450
>  ____fput+0x1c/0x30 fs/file_table.c:478
>  task_work_run+0x13a/0x1a0 kernel/task_work.c:239
>  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:329 [inline]
>  __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
>  syscall_exit_to_user_mode+0xa8/0x120 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: 0x0000000000000000 -> 0x0000000000000001
>
> Reported by Kernel Concurrency Sanitizer on:
> CPU: 0 UID: 0 PID: 6285 Comm: syz.1.1056 Not tainted 6.12.0-syzkaller-08756-g42d9e8b7ccdd #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
> ==================================================================
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@...glegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
> If the report is already addressed, let syzbot know by replying with:
> #syz fix: exact-commit-title
>
> If you want to overwrite report's subsystems, reply with:
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>
> If the report is a duplicate of another one, reply with:
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>
> If you want to undo deduplication, reply with:
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>
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