From: Jens Axboe <axboe@kernel.dk>
To: Gabriel Krisman Bertazi <krisman@suse.de>,
syzbot <syzbot+c74fea926a78b8a91042@syzkaller.appspotmail.com>
Cc: asml.silence@gmail.com, io-uring@vger.kernel.org,
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: Re: [PATCH] io_uring: Don't set affinity on a dying sqpoll thread
Date: Tue, 29 Aug 2023 08:04:19 -0600 [thread overview]
Message-ID: <870ea887-ecb0-4058-855b-6c82ab01c7fc@kernel.dk> (raw)
In-Reply-To: <87v8cybuo6.fsf@suse.de>
On 8/28/23 5:42 PM, Gabriel Krisman Bertazi wrote:
> syzbot <syzbot+c74fea926a78b8a91042@syzkaller.appspotmail.com> writes:
>
>> Hello,
>>
>> syzbot found the following issue on:
>>
>> HEAD commit: 626932085009 Add linux-next specific files for 20230825
>> git tree: linux-next
>> console output: https://syzkaller.appspot.com/x/log.txt?x=12a97797a80000
>> kernel config: https://syzkaller.appspot.com/x/.config?x=8a8c992a790e5073
>> dashboard link: https://syzkaller.appspot.com/bug?extid=c74fea926a78b8a91042
>> 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: https://storage.googleapis.com/syzbot-assets/46ec18b3c2fb/disk-62693208.raw.xz
>> vmlinux: https://storage.googleapis.com/syzbot-assets/b4ea0cb78498/vmlinux-62693208.xz
>> kernel image: https://storage.googleapis.com/syzbot-assets/5fb3938c7272/bzImage-62693208.xz
>>
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: syzbot+c74fea926a78b8a91042@syzkaller.appspotmail.com
>>
>> 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
next prev parent reply other threads:[~2023-08-29 14:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-28 9:59 [syzbot] [io-uring?] general protection fault in io_sqpoll_wq_cpu_affinity syzbot
2023-08-28 23:42 ` [PATCH] io_uring: Don't set affinity on a dying sqpoll thread Gabriel Krisman Bertazi
2023-08-29 13:21 ` Pavel Begunkov
2023-08-29 14:04 ` Jens Axboe [this message]
2023-08-29 17:37 ` Jens Axboe
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