linux-kernel - Re: WARNING: kernel stack regs at (ptrval) in syzkaller has bad 'bp' value (ptrval)

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Date:   Mon, 23 Apr 2018 12:59:30 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+e073e4740cfbb3ae200b@...kaller.appspotmail.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        David Miller <davem@...emloft.net>,
        linux-crypto@...r.kernel.org, Eric Biggers <ebiggers3@...il.com>
Subject: Re: WARNING: kernel stack regs at (ptrval) in syzkaller has bad 'bp'
 value (ptrval)

On Mon, Apr 23, 2018 at 12:10 PM, syzbot
<syzbot+e073e4740cfbb3ae200b@...kaller.appspotmail.com> wrote:
> Hello,
>
> syzbot hit the following crash on upstream commit
> 5ec83b22a2dd13180762c89698e4e2c2881a423c (Sun Apr 22 19:13:04 2018 +0000)
> Merge tag '4.17-rc1-SMB3-CIFS' of git://git.samba.org/sfrench/cifs-2.6
> syzbot dashboard link:
> https://syzkaller.appspot.com/bug?extid=e073e4740cfbb3ae200b
>
> C reproducer: https://syzkaller.appspot.com/x/repro.c?id=6509307940044800
> syzkaller reproducer:
> https://syzkaller.appspot.com/x/repro.syz?id=6027105183727616
> Raw console output:
> https://syzkaller.appspot.com/x/log.txt?id=4763013630394368
> Kernel config:
> https://syzkaller.appspot.com/x/.config?id=1808800213120130118
> compiler: gcc (GCC) 8.0.1 20180413 (experimental)

There are 2 similar bugs reported:

https://syzkaller.appspot.com/bug?id=4fcc07e4e85fc6c1d5472fcc8ab5a35db01972dc
https://syzkaller.appspot.com/bug?id=bed7a7acabe08fe69a89a4225572911a32598651

They all seem to point to crypto/SHA3/K512_4.
+crypto maintainers

> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+e073e4740cfbb3ae200b@...kaller.appspotmail.com
> It will help syzbot understand when the bug is fixed. See footer for
> details.
> If you forward the report, please keep this part and the footer.
>
>         (ptrval): 0000000000445649 (0x445649)
>         (ptrval): 0000000000000033 (0x33)
>         (ptrval): 0000000000000216 (0x216)
>         (ptrval): 00007f155536eda8 (0x7f155536eda8)
>         (ptrval): 000000000000002b (0x2b)
> WARNING: kernel stack regs at         (ptrval) in syzkaller547737:4493 has
> bad 'bp' value         (ptrval)
> WARNING: kernel stack frame pointer at         (ptrval) in
> syzkaller547737:4496 has bad value         (ptrval)
>
>
> ---
> This bug is generated by a dumb bot. It may contain errors.
> See https://goo.gl/tpsmEJ for details.
> Direct all questions to syzkaller@...glegroups.com.
>
> syzbot will keep track of this bug report.
> If you forgot to add the Reported-by tag, once the fix for this bug is
> merged
> into any tree, please reply to this email with:
> #syz fix: exact-commit-title
> If you want to test a patch for this bug, please reply with:
> #syz test: git://repo/address.git branch
> and provide the patch inline or as an attachment.
> To mark this as a duplicate of another syzbot report, please reply with:
> #syz dup: exact-subject-of-another-report
> If it's a one-off invalid bug report, please reply with:
> #syz invalid
> Note: if the crash happens again, it will cause creation of a new bug
> report.
> Note: all commands must start from beginning of the line in the email body.
>
> --
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