linux-next boot error: general protection fault in __x64_sys_settimeofday

From: syzbot <syzbot+dccce9b26ba09ca49966@syzkaller.appspotmail.com>
To: john.stultz@linaro.org, linux-kernel@vger.kernel.org,
	sboyd@kernel.org, syzkaller-bugs@googlegroups.com,
	tglx@linutronix.de
Subject: linux-next boot error: general protection fault in __x64_sys_settimeofday
Date: Thu, 14 Nov 2019 02:55:07 -0800	[thread overview]
Message-ID: <0000000000007ce85705974c50e5@google.com> (raw)

Hello,

syzbot found the following crash on:

HEAD commit:    8466d23e Add linux-next specific files for 20191114
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1057aa1ce00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7b7e774ae4847760
dashboard link: https://syzkaller.appspot.com/bug?extid=dccce9b26ba09ca49966
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+dccce9b26ba09ca49966@syzkaller.appspotmail.com

[^[[36minfo^[[39;49m] Using makefile-style concurrent boot in runlevel S.
[....] Starting the hotplug events dispatcher: udevd[   13.646252][ T4004]  
udevd[4004]: starting version 175
^[[?25l^[[?1c^[7^[[1G[^[[32m ok ^[[39;49m^[8^[[?25h^[[?0c.
[....] Synthesizing the initial hotplug events...udevd[4040]:  
rename '/dev/v4l/by-path/platform-vivid.0-video-index3.udev-tmp' '/dev/v4l/by-path/platform-vivid.0-video-index3'  
failed: No such file or directory

^[[?25l^[[?1c^[7[   20.856469][ T4350] general protection fault: 0000 [#1]  
PREEMPT SMP KASAN
[^[[1G   20.872048][ T4350] Hardware name: Google Google Comput[^[[32m ok  
^[[39;49me Engine/Google Compute Engine, BIOS Google 01/01/2011
^[8[ ^[[?25h^[[?0c  done.
20.890197][ T4350] Code: 85 50 ff ff ff 85 c0 0f 85 50 01 00 00 e8 b8 cd 10  
00 48 8b 85 48 ff ff ff 48 c1 e8 03 48 89 c2 48 b8 00 00 00 00 00 fc ff df  
<80> 3c 02 00 0f 85 8a 01 00 00 49 8b 74 24 08 bf 40 42 0f 00 48 89
[....] Waiting f[   21.522563][ T4350] RIP: 0010:__do_sys_settimeofday  
kernel/time/time.c:210 [inline]
[....] Waiting f[   21.522563][ T4350] RIP: 0010:__se_sys_settimeofday  
kernel/time/time.c:199 [inline]
[....] Waiting f[   21.522563][ T4350] RIP:  
0010:__x64_sys_settimeofday+0x170/0x320 kernel/time/time.c:199
or /dev to be fu[   21.550076][ T4350] RSP: 0018:ffff888093d0fe58 EFLAGS:  
00010206
lly populated...[   21.557498][ T4350] RAX: dffffc0000000000 RBX:  
1ffff110127a1fcd RCX: ffffffff8162e915

---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.