From: Eric Dumazet <eric.dumazet@gmail.com>
To: Bart Van Assche <bvanassche@acm.org>,
Eric Dumazet <eric.dumazet@gmail.com>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>, Will Deacon <will@kernel.org>,
linux-kernel@vger.kernel.org,
syzbot <syzbot+6f39a9deb697359fe520@syzkaller.appspotmail.com>,
syzkaller-bugs@googlegroups.com
Subject: Re: BUG: MAX_STACK_TRACE_ENTRIES too low! (2)
Date: Wed, 10 Jul 2019 22:47:43 +0200 [thread overview]
Message-ID: <ee3bac8d-d061-7d07-5990-59871e7e2a4b@gmail.com> (raw)
In-Reply-To: <cdfeb3f8-8dc5-aa60-2782-7b3c5110edf5@acm.org>
On 7/10/19 9:09 PM, Bart Van Assche wrote:
> On 7/10/19 11:44 AM, Eric Dumazet wrote:
>> If anything using workqueues in dynamically allocated objects can turn off lockdep,
>> we have a serious issue.
>
> As far as I know that issue is only hit by syzbot tests.
> Anyway, I see
> two possible paths forward:
> * Revert the patch that makes workqueues use dynamic lockdep keys and
> thereby reintroduce the false positives that lockdep reports if
> different workqueues share a lockdep key. I think there is agreement
> that having to analyze lockdep false positives is annoying, time
> consuming and something nobody likes.
> * Modify lockdep such that space in its fixed size arrays that is no
> longer in use gets reused. Since the stack traces saved in the
> stack_trace[] array have a variable size that array will have to be
> compacted to avoid fragmentation.
>
Can not destroy_workqueue() undo what alloc_workqueue() did ?
next prev parent reply other threads:[~2019-07-10 20:47 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-29 10:42 syzbot
2019-03-30 11:10 ` syzbot
2019-03-30 21:58 ` syzbot
2019-03-31 2:17 ` Bart Van Assche
2019-07-10 5:30 ` Eric Biggers
2019-07-10 14:19 ` Bart Van Assche
2019-07-10 17:00 ` Eric Biggers
2019-07-10 17:21 ` Eric Biggers
2019-07-10 17:46 ` Bart Van Assche
2019-07-10 18:02 ` Eric Biggers
2019-07-10 18:36 ` Bart Van Assche
2019-07-10 18:44 ` Eric Dumazet
2019-07-10 19:09 ` Bart Van Assche
2019-07-10 20:47 ` Eric Dumazet [this message]
2019-07-10 21:23 ` Bart Van Assche
2019-07-10 22:09 ` Peter Zijlstra
2019-07-11 18:53 ` Bart Van Assche
2019-07-12 8:55 ` Peter Zijlstra
2019-07-12 23:03 ` Bart Van Assche
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