Re: [PATCH] io_uring: Don't set affinity on a dying sqpoll thread

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On 8/28/23 5:42 PM, Gabriel Krisman Bertazi wrote:
> syzbot <syzbot+c74fea926a78b8a91042@xxxxxxxxxxxxxxxxxxxxxxxxx> writes:
>> Hello,
>> syzbot found the following issue on:
>> HEAD commit:    626932085009 Add linux-next specific files for 20230825
>> git tree:       linux-next
>> console output:
>> kernel config:
>> dashboard link:
>> 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.
>> Downloadable assets:
>> disk image:
>> vmlinux:
>> kernel image:
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: syzbot+c74fea926a78b8a91042@xxxxxxxxxxxxxxxxxxxxxxxxx
>> general protection fault, probably for non-canonical address 0xdffffc000000011d: 0000 [#1] PREEMPT SMP KASAN
>> KASAN: null-ptr-deref in range [0x00000000000008e8-0x00000000000008ef]
>> CPU: 1 PID: 27342 Comm: syz-executor.5 Not tainted 6.5.0-rc7-next-20230825-syzkaller #0
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
>> RIP: 0010:io_sqpoll_wq_cpu_affinity+0x8c/0xe0 io_uring/sqpoll.c:433
> Jens,
> I'm not sure I got the whole story on this one, but it seems fairly
> trivial to reproduce and I can't see another way it could be
> triggered. What do you think?

Yep looks like the right fix, we should check the thread after parking.
I'll get this added to the queue, thanks.

Jens Axboe

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