linux-kernel - Re: [PATCH] fuse: add a null-ptr check

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Message-ID: <364da8c4-7559-4c6e-afc4-d1b59a297d51@fastmail.fm>
Date: Mon, 2 Dec 2024 22:17:19 +0100
From: Bernd Schubert <bernd.schubert@...tmail.fm>
To: Joanne Koong <joannelkoong@...il.com>
Cc: Nihar Chaithanya <niharchaithanya@...il.com>, miklos@...redi.hu,
 linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
 skhan@...uxfoundation.org,
 syzbot+87b8e6ed25dbc41759f7@...kaller.appspotmail.com
Subject: Re: [PATCH] fuse: add a null-ptr check

Btw, totally unrelated to the report, but related to what the C 
reproducer does, killing it sometimes results in

  12563 pts/1    Zl     0:00 [syzkaller] <defunct>


[   46.018014] mount.nfs (1163) used greatest stack depth: 23944 bytes left
[ 9929.865478] syzkaller (12313) used greatest stack depth: 23216 bytes left
[10159.658915] INFO: task syzkaller:12312 blocked for more than 120 seconds.
[10159.663075]       Not tainted 6.13.0-rc1+ #92
[10159.665618] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[10159.673650] task:syzkaller       state:D stack:28944 pid:12312 tgid:12307 ppid:1      flags:0x00004006
[10159.681276] Call Trace:
[10159.683004]  <TASK>
[10159.685636]  __schedule+0x1b42/0x25b0
[10159.688521]  schedule+0xb5/0x260
[10159.690415]  __fuse_simple_request+0xc49/0x1350 [fuse]
[10159.694677]  ? wake_bit_function+0x210/0x210
[10159.697145]  fuse_do_getattr+0x2cb/0x600 [fuse]



Aborting the connection(s) 'fixes' that, but looks like it triggers
another issue. Timeouts would certainly help, but it still should
work automatically.


Thanks,
Bernd