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SubjectRe: BUG: corrupted list in cpu_stop_queue_work
From
syzbot has found a reproducer for the following crash on:

HEAD commit: 526674536360 Add linux-next specific files for 20180706
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=11ac81b2400000
kernel config: https://syzkaller.appspot.com/x/.config?x=c8d1cfc0cb798e48
dashboard link: https://syzkaller.appspot.com/bug?extid=d8a8e42dfba0454286ff
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=1507ca2c400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10431a2c400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+d8a8e42dfba0454286ff@syzkaller.appspotmail.com

RBP: 00000000006cb018 R08: 0000000000000002 R09: 00007fff6f890032
R10: 0000000020377000 R11: 0000000000000246 R12: 0000000000000003
R13: ffffffffffffffff R14: 0000000000000000 R15: 0000000000000000
list_add corruption. prev->next should be next (ffff8801daf26708), but was
0000000000000000. (prev=ffff8801daf26740).
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:28!
invalid opcode: 0000 [#1] SMP KASAN
CPU: 1 PID: 4449 Comm: syz-executor507 Not tainted
4.18.0-rc3-next-20180706+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:__list_add_valid.cold.0+0x23/0x25 lib/list_debug.c:26
Code: e8 9f 72 57 fe eb 97 48 89 d9 48 c7 c7 60 80 1a 88 e8 72 b8 ff fd 0f
0b 48 89 f1 48 c7 c7 20 81 1a 88 48 89 de e8 5e b8 ff fd <0f> 0b 4c 89 e2
48 89 de 48 c7 c7 60 82 1a 88 e8 4a b8 ff fd 0f 0b
RSP: 0018:ffff8801daf079c0 EFLAGS: 00010086
RAX: 0000000000000075 RBX: ffff8801daf26708 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81634381 RDI: 0000000000000001
RBP: ffff8801daf079d8 R08: ffff8801ad2464c0 R09: ffffed003b5e4fc0
R10: ffffed003b5e4fc0 R11: ffff8801daf27e07 R12: ffff8801daf26740
R13: ffff8801daf07ab8 R14: ffff8801daf26740 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000203e8008 CR3: 0000000008e6a000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
__list_add include/linux/list.h:60 [inline]
list_add_tail include/linux/list.h:93 [inline]
__cpu_stop_queue_work kernel/stop_machine.c:72 [inline]
cpu_stop_queue_work+0x248/0x460 kernel/stop_machine.c:87
stop_one_cpu_nowait+0xd3/0x100 kernel/stop_machine.c:341
watchdog_timer_fn+0x93/0x2e0 kernel/watchdog.c:367
__run_hrtimer kernel/time/hrtimer.c:1398 [inline]
__hrtimer_run_queues+0x3eb/0x10c0 kernel/time/hrtimer.c:1460
hrtimer_interrupt+0x2f3/0x750 kernel/time/hrtimer.c:1518
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline]
smp_apic_timer_interrupt+0x165/0x730 arch/x86/kernel/apic/apic.c:1050
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:867
</IRQ>
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 kernel/kcov.c:146
Code: 14 dd 28 00 00 00 4d 39 d0 72 1b 49 83 c1 01 4a 89 7c 10 e0 4a 89 74
10 e8 4a 89 54 10 f0 4a 89 4c d8 20 4c 89 08 5d c3 66 90 <55> 65 48 8b 04
25 40 ee 01 00 65 8b 15 5f 73 85 7e 48 89 e5 81 e2
RSP: 0018:ffff8801ad79e208 EFLAGS: 00000292 ORIG_RAX: ffffffffffffff13
RAX: ffff8801ad2464c0 RBX: ffffea000701e000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff819b034f RDI: 0000000000000007
RBP: ffff8801ad79e5a8 R08: ffff8801ad2464c0 R09: fffff94000e03c06
R10: fffff94000e03c06 R11: ffffea000701e037 R12: ffff8801ad79e580
R13: 1ffff10035af3c68 R14: dffffc0000000000 R15: 0000000000000000
shmem_undo_range+0x38e/0x29a0 mm/shmem.c:795
shmem_truncate_range+0x27/0xa0 mm/shmem.c:971
shmem_evict_inode+0x3b2/0xcb0 mm/shmem.c:1071
evict+0x4ae/0x990 fs/inode.c:558
iput_final fs/inode.c:1508 [inline]
iput+0x635/0xaa0 fs/inode.c:1534
dentry_unlink_inode+0x4ae/0x640 fs/dcache.c:377
__dentry_kill+0x44c/0x7a0 fs/dcache.c:569
dentry_kill+0xc9/0x5a0 fs/dcache.c:688
dput.part.26+0x66b/0x7a0 fs/dcache.c:849
dput+0x15/0x20 fs/dcache.c:831
__fput+0x558/0x930 fs/file_table.c:235
____fput+0x15/0x20 fs/file_table.c:251
task_work_run+0x1ec/0x2a0 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x1b08/0x2750 kernel/exit.c:869
do_group_exit+0x177/0x440 kernel/exit.c:972
__do_sys_exit_group kernel/exit.c:983 [inline]
__se_sys_exit_group kernel/exit.c:981 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:981
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x43f0f8
Code: Bad RIP value.
RSP: 002b:00007fff6f8995b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043f0f8
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00000000004bf1e8 R08: 00000000000000e7 R09: ffffffffffffffd0
R10: 0000000020377000 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000006d1180 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
(ftrace buffer empty)
---[ end trace 599d79740552877c ]---
RIP: 0010:__list_add_valid.cold.0+0x23/0x25 lib/list_debug.c:26
Code: e8 9f 72 57 fe eb 97 48 89 d9 48 c7 c7 60 80 1a 88 e8 72 b8 ff fd 0f
0b 48 89 f1 48 c7 c7 20 81 1a 88 48 89 de e8 5e b8 ff fd <0f> 0b 4c 89 e2
48 89 de 48 c7 c7 60 82 1a 88 e8 4a b8 ff fd 0f 0b
RSP: 0018:ffff8801daf079c0 EFLAGS: 00010086
RAX: 0000000000000075 RBX: ffff8801daf26708 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81634381 RDI: 0000000000000001
RBP: ffff8801daf079d8 R08: ffff8801ad2464c0 R09: ffffed003b5e4fc0
R10: ffffed003b5e4fc0 R11: ffff8801daf27e07 R12: ffff8801daf26740
R13: ffff8801daf07ab8 R14: ffff8801daf26740 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000043f0ce CR3: 0000000008e6a000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

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