linux-kernel - BUG: unable to handle kernel paging request in devpts

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Message-ID: <94eb2c05a3807b84210560f4a1fd@google.com>
Date:   Fri, 22 Dec 2017 13:38:01 -0800
From:   syzbot 
        <bot+529dcc7acae97863327261a275c516477f0f4595@...kaller.appspotmail.com>
To:     ebiederm@...ssion.com, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: BUG: unable to handle kernel paging request in devpts_mntget

syzkaller has found reproducer for 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


BUG: unable to handle kernel paging request at fffffffffffffff5
IP: devpts_mntget+0x13f/0x280 fs/devpts/inode.c:173
PGD 6425067 P4D 6425067 PUD 6427067 PMD 0
Oops: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
    (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 3151 Comm: syzkaller843661 Not tainted 4.15.0-rc4-mm1+ #49
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:devpts_mntget+0x13f/0x280 fs/devpts/inode.c:173
RSP: 0018:ffff8801c9fa7a50 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffffffffffffed RCX: ffffffff81d37b30
RDX: 1ffffffffffffffe RSI: 0000000000000001 RDI: fffffffffffffff5
RBP: ffff8801c9fa7ae0 R08: ffff8801db224d00 R09: 1ffff100393f4f05
R10: ffff8801c9fa74e8 R11: 0000000000000000 R12: 1ffff100393f4f4a
R13: ffff8801c9fa7a70 R14: ffff8801c22d2c00 R15: ffff8801c9fa7b20
FS:  00007f3a5e37a700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffff5 CR3: 00000001c9e6f005 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  ptm_open_peer+0x11a/0x2f0 drivers/tty/pty.c:632
  tty_ioctl+0x517/0x1610 drivers/tty/tty_io.c:2624
  vfs_ioctl fs/ioctl.c:46 [inline]
  do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686
  SYSC_ioctl fs/ioctl.c:701 [inline]
  SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
  entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x445619
RSP: 002b:00007f3a5e379da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000006dac54 RCX: 0000000000445619
RDX: 0000000000000000 RSI: 0000000000005441 RDI: 0000000000000292
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac50
R13: 6d74702f7665642f R14: 00007f3a5e37a9c0 R15: 0000000000000005
Code: 01 00 00 48 8b 5d 90 e8 90 b8 9c ff 48 8d 7b 08 48 b8 00 00 00 00 00  
fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 24 01 00 00 <4c> 8b 7b 08  
48 b8 00 00 00 00 00 fc ff df 49 8d bf 80 06 00 00
RIP: devpts_mntget+0x13f/0x280 fs/devpts/inode.c:173 RSP: ffff8801c9fa7a50
CR2: fffffffffffffff5
---[ end trace 6e60c4b715f85f6e ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


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