linux-kernel - Re: [Bug report] kernel panic: System is deadlocked on memory

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Date:   Wed, 17 May 2023 14:19:31 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     yang lan <lanyang0908@...il.com>
Cc:     axboe@...nel.dk, sashal@...nel.org, asml.silence@...il.com,
        dylany@...com, linux-kernel@...r.kernel.org,
        io-uring@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [Bug report] kernel panic: System is deadlocked on memory

On Wed, May 17, 2023 at 08:02:38PM +0800, yang lan wrote:
> Hi,
> 
> We use our modified Syzkaller to fuzz the Linux kernel and found the
> following issue:
> 
> Head Commit: f1b32fda06d2cfb8eea9680b0ba7a8b0d5b81eeb
> Git Tree: stable
> 
> Console output: https://pastebin.com/raw/Ssz6eVA6
> Kernel config: https://pastebin.com/raw/BiggLxRg
> C reproducer: https://pastebin.com/raw/tM1iyfjr
> Syz reproducer: https://pastebin.com/raw/CEF1R2jg
> 
> root@...kaller:~# uname -a
> Linux syzkaller 5.10.179 #5 SMP PREEMPT Mon May 1 23:59:32 CST 2023

Does this also happen on 6.4-rc2?


> x86_64 GNU/Linux
> root@...kaller:~# gcc poc_io_uring_enter.c -o poc_io_uring_enter
> root@...kaller:~# ./poc_io_uring_enter
> ...
> [  244.945440][ T3106]
> oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0-1,global_oom,task_memcg=/,task=dhclient,pid=4526,uid=0
> [  244.946537][ T3106] Out of memory: Killed process 4526 (dhclient)

Is this using fault injection, or a normal operation?

thanks,

greg k-h