linux-kernel - general protection fault in __list_del_entry

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Date:   Sun, 17 Dec 2017 07:47:01 -0800
From:   syzbot 
        <bot+065a25551da6c9ab4283b7ae889c707a37ab2de3@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, david@...morbit.com, hannes@...xchg.org,
        hillf.zj@...baba-inc.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, mgorman@...hsingularity.net, mhocko@...nel.org,
        mhocko@...e.com, minchan@...nel.org,
        penguin-kernel@...ove.SAKURA.ne.jp, shakeelb@...gle.com,
        shli@...com, syzkaller-bugs@...glegroups.com,
        viro@...iv.linux.org.uk, ying.huang@...el.com
Subject: general protection fault in __list_del_entry_valid (2)

syzkaller has found reproducer for the following crash on  
82bcf1def3b5f1251177ad47c44f7e17af039b4b
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


R13: 0000000000403940 R14: 0000000000000000 R15: 0000000000000000
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: 3146 Comm: syzkaller259864 Not tainted 4.15.0-rc2-mm1+ #39
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:__list_del_entry_valid+0x7e/0x150 lib/list_debug.c:51
RSP: 0018:ffff8801c4d97b48 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8801c4ac75d8 RDI: ffff8801c4ac75e0
RBP: ffff8801c4d97b60 R08: ffff8801c4d975c0 R09: ffff8801c5bd2180
R10: 000000000000000b R11: ffffed00389b2eba R12: 0000000000000000
R13: dffffc0000000000 R14: 1ffff100389b2f8d R15: ffff8801c4ac75d8
FS:  0000000001689940(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000207caf71 CR3: 00000001c5f99002 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  __list_del_entry include/linux/list.h:117 [inline]
  list_del include/linux/list.h:125 [inline]
  unregister_shrinker+0x79/0x300 mm/vmscan.c:285
  deactivate_locked_super+0x64/0xd0 fs/super.c:311
  deactivate_super+0x141/0x1b0 fs/super.c:343
  cleanup_mnt+0xb2/0x150 fs/namespace.c:1173
  __cleanup_mnt+0x16/0x20 fs/namespace.c:1180
  task_work_run+0x199/0x270 kernel/task_work.c:113
  tracehook_notify_resume include/linux/tracehook.h:191 [inline]
  exit_to_usermode_loop+0x275/0x2f0 arch/x86/entry/common.c:165
  prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
  syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
  entry_SYSCALL_64_fastpath+0x94/0x96
RIP: 0033:0x446679
RSP: 002b:00007ffccb258058 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffec RBX: 00007ffccb258000 RCX: 0000000000446679
RDX: 0000000020f9effa RSI: 00000000202b9000 RDI: 0000000020b85ff8
RBP: 0000000000000003 R08: 00000000207caf71 R09: 0000000000003531
R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff
R13: 0000000000000006 R14: 0000000000000000 R15: 0000000000000000
Code: 00 00 00 00 ad de 49 39 c4 74 66 48 b8 00 02 00 00 00 00 ad de 48 89  
da 48 39 c3 74 65 48 c1 ea 03 48 b8 00 00 00 00 00 fc ff df <80> 3c 02 00  
75 7b 48 8b 13 48 39 f2 75 57 49 8d 7c 24 08 48 b8
RIP: __list_del_entry_valid+0x7e/0x150 lib/list_debug.c:51 RSP:  
ffff8801c4d97b48
---[ end trace 422dd7d3477fece7 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


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