linux-kernel - x86: WARNING: kernel stack frame pointer in kworker has bad value

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Date:   Mon, 23 Jan 2017 19:43:18 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "x86@...nel.org" <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     syzkaller <syzkaller@...glegroups.com>
Subject: x86: WARNING: kernel stack frame pointer in kworker has bad value

Hello,

I am getting the following warnings while running syzkaller fuzzer on
7a308bb3016f57e5be11a677d15b821536419d36:

WARNING: kernel stack frame pointer at ffff880065f7fef8 in
kworker/1:3:21075 has bad value ffffffff81598080
unwind stack type:0 next_sp:          (null) mask:2 graph_idx:0
...

Here are 4 examples:

https://gist.githubusercontent.com/dvyukov/7258fca11e5c3db6e8f8fb684e6168ff/raw/2ca14f3c7294c7e466611f8ecfb3072c676a657c/gistfile1.txt
https://gist.githubusercontent.com/dvyukov/cc442b144ae712f0e1bdeb065085e36a/raw/f713cef7e9689914fc94838a0a7d4192224fb6d2/gistfile1.txt
https://gist.githubusercontent.com/dvyukov/9058cce2647e3d37157c283c6400498c/raw/7a8ec8d71b9e95eeb24156073eeef96ba61d95ea/gistfile1.txt
https://gist.githubusercontent.com/dvyukov/b899dfa72d611b511a674b63676921f3/raw/90203ed26b6674dedba8c1c16dd76309ef21fbea/gistfile1.txt

Unfortunately this is not reproducible, but there is a stack dump, so
maybe it's enough to figure out the root cause.

Thanks