linux-kernel - Re: [syzbot] Monthly trace report (May 2024)

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Date: Sun, 2 Jun 2024 12:09:50 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: syzbot <syzbot+list0820d438c1905c75bc71@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
 syzkaller-bugs@...glegroups.com, bpf@...r.kernel.org
Subject: Re: [syzbot] Monthly trace report (May 2024)

On Thu, 30 May 2024 23:50:32 -0700
syzbot <syzbot+list0820d438c1905c75bc71@...kaller.appspotmail.com> wrote:

> Hello trace maintainers/developers,
> 
> This is a 31-day syzbot report for the trace subsystem.
> All related reports/information can be found at:
> https://syzkaller.appspot.com/upstream/s/trace
> 
> During the period, 1 new issues were detected and 0 were fixed.
> In total, 10 issues are still open and 35 have been fixed so far.
> 
> Some of the still happening issues:
> 
> Ref Crashes Repro Title
> <1> 705     Yes   WARNING in format_decode (3)
>                   https://syzkaller.appspot.com/bug?extid=e2c932aec5c8a6e1d31c

Could you send this to bpf folks? It seems bpf_trace_printk caused this errror.
(Maybe skipping fmt string check?)

> <2> 26      Yes   INFO: task hung in blk_trace_ioctl (4)
>                   https://syzkaller.appspot.com/bug?extid=ed812ed461471ab17a0c

This looks like debugfs_mutex lock leakage. Need to rerun with lockdep.

> <3> 7       Yes   WARNING in get_probe_ref
>                   https://syzkaller.appspot.com/bug?extid=8672dcb9d10011c0a160

Hm, fail on register_trace_block_rq_insert(). blktrace issue.

> <4> 6       Yes   INFO: task hung in blk_trace_remove (2)
>                   https://syzkaller.appspot.com/bug?extid=2373f6be3e6de4f92562

This looks like debugfs_mutex lock leakage too.

> <5> 5       Yes   general protection fault in bpf_get_attach_cookie_tracing
>                   https://syzkaller.appspot.com/bug?extid=3ab78ff125b7979e45f9

This is also BPF problem.

Thank you,

> 
> ---
> 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.
> 
> To disable reminders for individual bugs, reply with the following command:
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> 
> To change bug's subsystems, reply with:
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> 
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-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>