Re: kernel panic: stack is corrupted in __lock_acquire (4)

[Dmitry Vyukov]

On Sun, Sep 1, 2019 at 3:48 PM syzbot
<syzbot+83979935eb6304f8cd46@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> syzbot has found a reproducer for the following crash on:
>
> HEAD commit:    38320f69 Merge branch 'Minor-cleanup-in-devlink'
> git tree:       net-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=13d74356600000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=1bbf70b6300045af
> dashboard link: https://syzkaller.appspot.com/bug?extid=83979935eb6304f8cd46
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1008b232600000

Stack corruption + bpf maps in repro triggers some bells. +bpf mailing list.

> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+83979935eb6304f8cd46@xxxxxxxxxxxxxxxxxxxxxxxxx
>
> Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in:
> __lock_acquire+0x36fa/0x4c30 kernel/locking/lockdep.c:3907
> CPU: 0 PID: 8662 Comm: syz-executor.4 Not tainted 5.3.0-rc6+ #153
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
> Kernel Offset: disabled
> Rebooting in 86400 seconds..
>
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