linux-kernel - Re: BUG: MAX_STACK_TRACE

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Message-ID: <1552317574.45180.94.camel@acm.org>
Date:   Mon, 11 Mar 2019 08:19:34 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     syzbot <syzbot+78923eea7cf44364f4fb@...kaller.appspotmail.com>,
        akpm@...ux-foundation.org, darrick.wong@...cle.com,
        dledford@...hat.com, gustavo@...eddedor.com, hch@...radead.org,
        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, mingo@...hat.com,
        paulmck@...ux.vnet.ibm.com, peterz@...radead.org,
        roland@...estorage.com, sean.hefty@...el.com,
        shamir.rabinovitch@...cle.com, swise@...ngridcomputing.com,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de, tj@...nel.org,
        torvalds@...ux-foundation.org, will.deacon@....com,
        xiyou.wangcong@...il.com
Subject: Re: BUG: MAX_STACK_TRACE_ENTRIES too low!

On Mon, 2019-03-11 at 06:26 -0700, 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=17dec757200000
> start commit:   669de8bd kernel/workqueue: Use dynamic lockdep keys for wo..
> git tree:       upstream
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=143ec757200000
> console output: https://syzkaller.appspot.com/x/log.txt?x=103ec757200000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=bd349f14600e1305
> dashboard link: https://syzkaller.appspot.com/bug?extid=78923eea7cf44364f4fb
> userspace arch: amd64
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=149c858d200000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=111aee33200000
> 
> Reported-by: syzbot+78923eea7cf44364f4fb@...kaller.appspotmail.com
> Fixes: 669de8bd ("kernel/workqueue: Use dynamic lockdep keys for  
> workqueues")

I think this issue has been fixed by a commit that went upstream yesterday. Hence:

#syz fix: workqueue, lockdep: Fix an alloc_workqueue() error path