linux-kernel - Re: BUG: MAX_STACK_TRACE

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Date:   Sat, 30 Mar 2019 19:17:09 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     syzbot <syzbot+6f39a9deb697359fe520@...kaller.appspotmail.com>,
        akpm@...ux-foundation.org, danitg@...lanox.com,
        darrick.wong@...cle.com, dledford@...hat.com,
        gustavo@...eddedor.com, jannh@...gle.com, jgg@...pe.ca,
        johannes.berg@...el.com, leon@...nel.org,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-xfs@...r.kernel.org, longman@...hat.com, mingo@...nel.org,
        paulmck@...ux.vnet.ibm.com, peterz@...radead.org,
        roland@...estorage.com, shamir.rabinovitch@...cle.com,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de, tj@...nel.org,
        torvalds@...ux-foundation.org, will.deacon@....com,
        xiyou.wangcong@...il.com, Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: BUG: MAX_STACK_TRACE_ENTRIES too low! (2)

On 3/30/19 2:58 PM, syzbot wrote:
> syzbot has bisected this bug to:
> 
> commit 669de8bda87b92ab9a2fc663b3f5743c2ad1ae9f
> Author: Bart Van Assche <bvanassche@....org>
> Date:   Thu Feb 14 23:00:54 2019 +0000
> 
>      kernel/workqueue: Use dynamic lockdep keys for workqueues
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=17f1bacd200000
> start commit:   0e40da3e Merge tag 'kbuild-fixes-v5.1' of 
> git://git.kernel..
> git tree:       upstream
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=1409bacd200000
> console output: https://syzkaller.appspot.com/x/log.txt?x=1009bacd200000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=8dcdce25ea72bedf
> dashboard link: 
> https://syzkaller.appspot.com/bug?extid=6f39a9deb697359fe520
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10e1bacd200000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1120fe0f200000
> 
> Reported-by: syzbot+6f39a9deb697359fe520@...kaller.appspotmail.com
> Fixes: 669de8bda87b ("kernel/workqueue: Use dynamic lockdep keys for 
> workqueues")
> 
> For information about bisection process see: 
> https://goo.gl/tpsmEJ#bisection

Hi Dmitry,

This bisection result doesn't make sense to me. As one can see, the 
message "BUG: MAX_STACK_TRACE_ENTRIES too low!" does not occur in the 
console output the above console output URL points at.

Bart.