linux-kernel - Re: [Syzkaller] INFO: task hung in fuse

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Date:   Tue, 18 Oct 2022 09:37:33 +0800
From:   Pengfei Xu <pengfei.xu@...el.com>
To:     <linux-kernel@...r.kernel.org>, <mszeredi@...hat.com>
CC:     <heng.su@...el.com>
Subject: Re: [Syzkaller] INFO: task hung in fuse_lookup with v6.0 kernel in
 guest

Hi,

I received the email that:"BOUNCE linux-kernel@...r.kernel.org: Message too
long (>6000000 chars)".

To avoid missing the attached log, I put all the info in below link:
https://github.com/xupengfe/syzkaller_logs/tree/main/221017_task_hung_in_fuse_lookup

It's reproduced in v6.0 mainline guest on TGL-H platform.
The dmesg that reproduces the issue with the v6.0 kernel in the guest is also
in the link above.

Thanks!
BR.


On 2022-10-17 at 17:09:51 +0800, Pengfei Xu wrote:
> Hi Miklos,
> 
> Greeting!
> 
> Platform: Tiger lake CPU platform.
> 
> We found 1 "task hung in fuse_lookup" issue by syzkaller with v6.0 mainline
> kernel in guest.
> 
> Bisected and found the bad commit:
> "
> commit:  62dd1fc8cc6b22e3e568be46ebdb817e66f5d6a5
> fuse: move fget() to fuse_get_tree()
> "
> 
> Reproduced code generated by syzkaller, binary, bisect log and all the dmesg
> info are in attached package.
> 
> Hope it's helpful.
> 
> Thanks!
> BR.