Re: [Kernel Bug] INFO: task hung in inode_sleep_on_writeback

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Hello!

On Fri 20-12-24 00:24:50, Zhiyu Zhang wrote:
> We would like to report a Linux kernel bug titled "INFO: task hung in
> inode_sleep_on_writeback" on Linux-6.13-rc3 through our syzkaller.
> 
> We noticed that there was also a report in Linux-5.15 with the same title
> in November 2021 (
> https://syzkaller.appspot.com/bug?id=db653376de6a338b4a3c492b95634d6cabbdd68d),
> but it did not have any reproductors. We found the lacking Syz and C
> reproducers and can reproduce the issue in kernel 6.13-rc3 (see the
> reproduction log). But I am not sure if they share the same root cause.
> Here are the relevant attachments:
> 
> kernel config:
> https://drive.google.com/file/d/1d_Wuer-ZN1HELwDCoUHbWdlf8cIdRWOn/view?usp=sharing
> manual reproduction log:
> https://drive.google.com/file/d/1ZBshikZqJ78LHl7C3d4UOzPJE1konn9m/view?usp=sharing
> repro report:
> https://drive.google.com/file/d/1Nacupxxgcm6g3LZ95yADh7T9i20OFmM6/view?usp=sharing
> repro log:
> https://drive.google.com/file/d/1FlZPy9AJ9bu7MTEANszRV6IPo7dTe63G/view?usp=sharing
> syz reproducer:
> https://drive.google.com/file/d/1JA2KRWpLHglRGt2bgruYSgRrcDDE4fD3/view?usp=sharing
> C reproducer:
> https://drive.google.com/file/d/16AyJ0A-xXq32vXDbz714rmHuel9jvxyF/view?usp=sharing

Well, the reproducers are hardly relevant for this. The syz reproducer is:

r0 = socket$unix(0x1, 0x5, 0x0)
ioctl$sock_SIOCETHTOOL(r0, 0x89f0, ...)

and that's all... Definitely not a VFS bug, perhaps ask networking people
whether fuzzing SIOCETHTOOL ioctl makes sense.

								Honza
-- 
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR




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