linux-kernel - WARNING in __switch

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Date:   Thu, 04 Jan 2018 20:58:00 -0800
From:   syzbot <syzbot+1d7d9ce4ce4a23cb7d3b@...kaller.appspotmail.com>
To:     bp@...e.de, dsafonov@...tuozzo.com, hpa@...or.com,
        linux-kernel@...r.kernel.org, luto@...nel.org, me@...ehuey.com,
        mingo@...hat.com, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de, x86@...nel.org
Subject: WARNING in __switch_to (2)

Hello,

syzkaller hit the following crash on  
37759fa6d0fa9e4d6036d19ac12f555bfc0aeafd
git://git.cmpxchg.org/linux-mmots.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
C reproducer is attached
syzkaller reproducer is attached. See https://goo.gl/kgGztJ
for information about syzkaller reproducers

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+1d7d9ce4ce4a23cb7d3b@...kaller.appspotmail.com
It will help syzbot understand when the bug is fixed. See footer for  
details.
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WARNING: CPU: 0 PID: 3192 at ./arch/x86/include/asm/fpu/internal.h:340  
paravirt_write_msr arch/x86/include/asm/paravirt.h:21 [inline]
WARNING: CPU: 0 PID: 3192 at ./arch/x86/include/asm/fpu/internal.h:340  
wrmsrl arch/x86/include/asm/paravirt.h:149 [inline]
WARNING: CPU: 0 PID: 3192 at ./arch/x86/include/asm/fpu/internal.h:340  
load_seg_legacy arch/x86/kernel/process_64.c:255 [inline]
WARNING: CPU: 0 PID: 3192 at ./arch/x86/include/asm/fpu/internal.h:340  
__switch_to+0x10bd/0x13c0 arch/x86/kernel/process_64.c:455
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 3192 Comm: syzkaller835319 Not tainted 4.15.0-rc4-mm1+ #49
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
Shutting down cpus with NMI
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user [me m   
or41y .3ac65ce0s98s
]
Rebooting in 86400 seconds..
---[ end trace 2d2aa5997809e25d ]---

---
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.

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View attachment "config.txt" of type "text/plain" (126387 bytes)

Download attachment "raw.log" of type "application/octet-stream" (10742 bytes)

View attachment "repro.txt" of type "text/plain" (1395 bytes)

Download attachment "repro.c" of type "application/octet-stream" (42894 bytes)