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Date:   Sun, 03 Dec 2017 19:17:00 -0800
From:   syzbot 
        <bot+054c6cd125793643a90db21e4b9ddc71a881f797@...kaller.appspotmail.com>
To:     adobriyan@...il.com, akinobu.mita@...il.com,
        akpm@...ux-foundation.org, bfields@...hat.com, davem@...emloft.net,
        dvyukov@...gle.com, ebiederm@...ssion.com,
        gregkh@...uxfoundation.org, jpoimboe@...hat.com,
        linux-kernel@...r.kernel.org, mingo@...nel.org,
        schwidefsky@...ibm.com, security@...nel.org,
        syzkaller-bugs@...glegroups.com, vegard.nossum@...cle.com
Subject: general protection fault in show_timer

syzkaller has found reproducer for the following crash on  
4131d5166185d0d75b5f1d4bf362a9e0bac05598
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


kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
    (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 3084 Comm: syzkaller930220 Not tainted 4.15.0-rc1-mm1+ #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
task: 00000000ba405a9b task.stack: 00000000c05e4588
RIP: 0010:show_timer+0x1c7/0x2b0 fs/proc/base.c:2303
RSP: 0018:ffff8801cb9b7ac8 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: ffff8801cb8e2e00 RCX: ffffffff81cd3aee
RDX: 0000000050a68705 RSI: ffffffff85f1a780 RDI: 0000000285343828
RBP: ffff8801cb9b7af8 R08: ffffed00397474e5 R09: ffffed00397474e5
R10: ffff8801cc0fc000 R11: ffffed00397474e4 R12: 0000000060000001
R13: ffff8801cbec05c0 R14: ffffffff85342920 R15: 0000000000000c0c
FS:  00000000010b4880(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020b15000 CR3: 00000001cb9f7000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  seq_read+0x385/0x13d0 fs/seq_file.c:234
  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: 0033:0x440159
RSP: 002b:00007ffdfd209348 EFLAGS: 00000217 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00007ffdfd209350 RCX: 0000000000440159
RDX: 0000000000000001 RSI: 0000000020b15000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 65732f636f72702f R09: 65732f636f72702f
R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401a20
R13: 0000000000401ab0 R14: 0000000000000000 R15: 0000000000000000
Code: 89 c7 4c 0f 44 f1 41 83 e4 fb 4d 63 e4 e8 c2 00 a3 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: ffff8801cb9b7ac8
---[ end trace 6e3489af1f81e62c ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


View attachment "config.txt" of type "text/plain" (126531 bytes)

Download attachment "raw.log" of type "application/octet-stream" (4113 bytes)

View attachment "repro.txt" of type "text/plain" (1066 bytes)

Download attachment "repro.c" of type "application/octet-stream" (1865 bytes)

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