linux-kernel - Re: [syzbot] [trace?] WARNING in tracepoint_add

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Message-ID: <20250307201238.1a3f9f53@gandalf.local.home>
Date: Fri, 7 Mar 2025 20:12:38 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: syzbot <syzbot+161412ccaeff20ce4dde@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
 mathieu.desnoyers@...icios.com, mhiramat@...nel.org,
 syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [trace?] WARNING in tracepoint_add_func (2)

On Fri, 07 Mar 2025 16:02:22 -0800
syzbot <syzbot+161412ccaeff20ce4dde@...kaller.appspotmail.com> wrote:

> syzbot found the following issue on:
> 
> HEAD commit:    7eb172143d55 Linux 6.14-rc5
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=11b9a464580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=bed8205d3b84ef81
> dashboard link: https://syzkaller.appspot.com/bug?extid=161412ccaeff20ce4dde
> compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> 
> Unfortunately, I don't have any reproducer for this issue yet.

Yeah, because you add random fault injections, you wont hit it, unless you
have the right addition of faults.

> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/06a492964134/disk-7eb17214.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/83adeaa22219/vmlinux-7eb17214.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/7386164633ed/bzImage-7eb17214.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+161412ccaeff20ce4dde@...kaller.appspotmail.com

There's a ton of fault injections here, which if happened in a real
situation, would mean the system was likely about to crash. Especially
since it's failing on 1 page allocations of GFP_KERNEL, which only happens
when there's no free memory available.

This warning is the least of you worries in such a scenario.

-- Steve