linux-kernel - Re: BUG: stack guard page was hit in unwind_next

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Message-ID: <20200504190348.iphzmd7micvidh46@treble>
Date:   Mon, 4 May 2020 14:03:48 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     syzbot <syzbot+e73ceacfd8560cc8a3ca@...kaller.appspotmail.com>
Cc:     bp@...en8.de, hpa@...or.com, linux-kernel@...r.kernel.org,
        mingo@...hat.com, netdev@...r.kernel.org, peterz@...radead.org,
        shile.zhang@...ux.alibaba.com, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de, x86@...nel.org
Subject: Re: BUG: stack guard page was hit in unwind_next_frame

On Sat, May 02, 2020 at 11:36:11PM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    8999dc89 net/x25: Fix null-ptr-deref in x25_disconnect
> git tree:       net
> console output: https://syzkaller.appspot.com/x/log.txt?x=16004440100000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=b7a70e992f2f9b68
> dashboard link: https://syzkaller.appspot.com/bug?extid=e73ceacfd8560cc8a3ca
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> 
> Unfortunately, I don't have any reproducer for this crash yet.
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+e73ceacfd8560cc8a3ca@...kaller.appspotmail.com

Infinite loop in network code.

#syz dup: BUG: stack guard page was hit in deref_stack_reg

-- 
Josh