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

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Date:   Mon, 04 Dec 2017 10:37:01 -0800
From:   syzbot 
        <bot+622218cca6b8799ee7d258450c8c3c0dba9e1bd7@...kaller.appspotmail.com>
To:     adobriyan@...il.com, akinobu.mita@...il.com,
        akpm@...ux-foundation.org, dvyukov@...gle.com,
        ebiederm@...ssion.com, jani.nikula@...el.com,
        linux-kernel@...r.kernel.org, mingo@...nel.org,
        sfr@...b.auug.org.au, syzkaller-bugs@...glegroups.com,
        vegard.nossum@...cle.com
Subject: BUG: unable to handle kernel paging request in show_timer

syzkaller has found reproducer for the following crash on  
7cc61a0a562c7005d2a34f97e94cf26689a2f57c
git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.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 000000008131fd3c
IP: show_timer+0x1c7/0x2b0 fs/proc/base.c:2303
PGD 21ffd3067 P4D 21ffd3067 PUD 21ffd2067 PMD 0
Oops: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
    (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 3088 Comm: syzkaller999459 Not tainted  
4.15.0-rc2-next-20171204+ #58
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
task: 0000000032abdc2b task.stack: 00000000c727a7f6
RIP: 0010:show_timer+0x1c7/0x2b0 fs/proc/base.c:2303
RSP: 0018:ffff8801cc17f9e0 EFLAGS: 00010806
RAX: dffffc0000000000 RBX: ffff8801cc8a8e00 RCX: ffffffff81cd3ffe
RDX: 1ffffffff1a68706 RSI: ffffffff85f1a720 RDI: ffffffff8d343830
RBP: ffff8801cc17fa10 R08: ffffed0039959075 R09: ffffed0039959075
R10: ffff8801ccd6a400 R11: ffffed0039959074 R12: 0000000001000002
R13: ffff8801cc089800 R14: ffffffff85342920 R15: 0000000000000c09
FS:  00007f9d87ef7700(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffbfff1a68706 CR3: 00000001cc9e3000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  traverse+0x248/0xa00 fs/seq_file.c:111
  seq_read+0x96a/0x13d0 fs/seq_file.c:189
  do_loop_readv_writev fs/read_write.c:673 [inline]
  do_iter_read+0x3db/0x5b0 fs/read_write.c:897
  vfs_readv+0x121/0x1c0 fs/read_write.c:959
  do_preadv+0x11b/0x1a0 fs/read_write.c:1043
  SYSC_preadv fs/read_write.c:1093 [inline]
  SyS_preadv+0x30/0x40 fs/read_write.c:1088
  entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x445c99
RSP: 002b:00007f9d87ef6d38 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445c99
RDX: 0000000000000004 RSI: 0000000020f40000 RDI: 0000000000000004
RBP: 0000000000000000 R08: 00007f9d87ef7700 R09: 0000000000000000
R10: 0000000002000004 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd5c376aff R14: 00007f9d87ef79c0 R15: 0000000000000000
Code: 89 c7 4c 0f 44 f1 41 83 e4 fb 4d 63 e4 e8 42 fc a2 ff 4a 8d 3c e5 20  
38 34 85 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00  
0f 85 a2 00 00 00 4a 8b 14 e5 20 38 34 85 4c 89 ef
RIP: show_timer+0x1c7/0x2b0 fs/proc/base.c:2303 RSP: ffff8801cc17f9e0
CR2: fffffbfff1a68706
---[ end trace 9b76201f752b2992 ]---


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