RBP: 0000000000000000 R08: 0000000020000218 R09: 00000000fbad8001
R10: 0000000000010000 R11: 0000000000000293 R12: 0000000000000014
R13: 0000000000000001 R14: 00000000004d3840 R15: 0000000000000005
list_add corruption. prev->next should be next (ffff8801dae26708), but was 0000000000000000. (prev=ffff8801dae26740).
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:28!
invalid opcode: 0000 [#1] SMP KASAN
CPU: 0 PID: 2040 Comm: loop2 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:ffff8801dae079c0 EFLAGS: 00010086
RAX: 0000000000000075 RBX: ffff8801dae26708 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81634381 RDI: 0000000000000001
RBP: ffff8801dae079d8 R08: ffff88019f0c2040 R09: ffffed003b5c4fc0
R10: ffffed003b5c4fc0 R11: ffff8801dae27e07 R12: ffff8801dae26740
R13: ffff8801dae07ab8 R14: ffff8801dae26740 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa33d759140 CR3: 0000000008e6a000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
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_cmp1+0x12/0x20 kernel/kcov.c:150
Code: 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 5d c3 0f 1f 00 55 40 0f b6 d6 40 0f b6 f7 31 ff 48 89 e5 48 8b 4d 08 <e8> 29 ff ff ff 5d c3 0f 1f 80 00 00 00 00 55 0f b7 d6 0f b7 f7 bf 
RSP: 0018:ffff8801ab69e560 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: ffff8801c9341c42 RCX: ffffffff8799c394
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8801ab69e560 R08: ffff88019f0c2040 R09: fffff94000e0925e
R10: fffff94000e0925e R11: ffffea00070492f7 R12: ffff8801c9341c40
R13: ffff8801ab69e668 R14: 0000000000000000 R15: 0000000000000000
 xas_load+0xd4/0x1e0 lib/xarray.c:208
 find_get_entry+0x3c4/0x1120 mm/filemap.c:1400
 find_lock_entry+0xe6/0x8c0 mm/filemap.c:1457
 shmem_getpage_gfp+0x3cd/0x3ec0 mm/shmem.c:1610
 shmem_getpage mm/shmem.c:132 [inline]
 shmem_file_read_iter+0x399/0x1090 mm/shmem.c:2433
 call_read_iter include/linux/fs.h:1816 [inline]
 do_iter_readv_writev+0x790/0xa90 fs/read_write.c:678
 do_iter_read+0x26e/0x650 fs/read_write.c:922
 vfs_iter_read+0x77/0xb0 fs/read_write.c:936
 lo_read_simple drivers/block/loop.c:350 [inline]
 do_req_filebacked drivers/block/loop.c:615 [inline]
 loop_handle_cmd drivers/block/loop.c:1786 [inline]
 loop_queue_work+0x9ce/0x3afc drivers/block/loop.c:1800
 kthread_worker_fn+0x35f/0xa50 kernel/kthread.c:656
 loop_kthread_worker_fn+0x51/0x60 drivers/block/loop.c:892
 kthread+0x345/0x410 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace 027620270e37f8d3 ]---
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:ffff8801dae079c0 EFLAGS: 00010086
RAX: 0000000000000075 RBX: ffff8801dae26708 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81634381 RDI: 0000000000000001
RBP: ffff8801dae079d8 R08: ffff88019f0c2040 R09: ffffed003b5c4fc0
R10: ffffed003b5c4fc0 R11: ffff8801dae27e07 R12: ffff8801dae26740
R13: ffff8801dae07ab8 R14: ffff8801dae26740 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa33d759140 CR3: 0000000008e6a000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600