From: Jens Axboe <axboe@kernel.dk>
To: Thomas Gleixner <tglx@linutronix.de>,
syzbot <syzbot+b935db3fe409625cca1b@syzkaller.appspotmail.com>,
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com,
io-uring@vger.kernel.org
Subject: Re: [syzbot] general protection fault in hrtimer_start_range_ns
Date: Wed, 8 Sep 2021 11:02:56 -0600 [thread overview]
Message-ID: <8bbede01-4a97-bf22-92ad-c05a562c9799@kernel.dk> (raw)
In-Reply-To: <875yvbf23g.ffs@tglx>
On 9/8/21 10:45 AM, Thomas Gleixner wrote:
> On Mon, Sep 06 2021 at 03:28, syzbot wrote:
>> syzbot found the following issue on:
>>
>> HEAD commit: 835d31d319d9 Merge tag 'media/v5.15-1' of git://git.kernel..
>> git tree: upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=14489886300000
>> kernel config: https://syzkaller.appspot.com/x/.config?x=d793523866f2daea
>> dashboard link: https://syzkaller.appspot.com/bug?extid=b935db3fe409625cca1b
>> compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.1
>>
>> Unfortunately, I don't have any reproducer for this issue yet.
>>
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: syzbot+b935db3fe409625cca1b@syzkaller.appspotmail.com
>>
>> general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
>> KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
>> CPU: 0 PID: 12936 Comm: iou-sqp-12929 Not tainted 5.14.0-syzkaller #0
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
>> RIP: 0010:lock_hrtimer_base kernel/time/hrtimer.c:173 [inline]
>
> That's almost certainly deferencing hrtimer->base and as that is NULL
> this looks like a not initialized hrtimer.
Does certainly look like that, I'll take a look. And agree the next one
looks like the same thing.
--
Jens Axboe
next prev parent reply other threads:[~2021-09-08 17:03 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-06 10:28 [syzbot] general protection fault in hrtimer_start_range_ns syzbot
2021-09-08 16:45 ` Thomas Gleixner
2021-09-08 17:02 ` Jens Axboe [this message]
2021-09-08 17:20 ` Jens Axboe
2021-09-08 21:11 ` Thomas Gleixner
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