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: 22785 Comm: loop4 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: ffff88018ff862c0 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: 0000001b32722000 CR3: 00000001b1b6c000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __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 RIP: 0010:__read_once_size include/linux/compiler.h:188 [inline] RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:31 [inline] RIP: 0010:atomic_read include/asm-generic/atomic-instrumented.h:22 [inline] RIP: 0010:atomic_fetch_add_unless include/linux/atomic.h:569 [inline] RIP: 0010:atomic_add_unless include/linux/atomic.h:591 [inline] RIP: 0010:page_ref_add_unless include/linux/page_ref.h:157 [inline] RIP: 0010:get_page_unless_zero include/linux/mm.h:511 [inline] RIP: 0010:page_cache_get_speculative include/linux/pagemap.h:186 [inline] RIP: 0010:find_get_entry+0x518/0x1120 mm/filemap.c:1411 Code: 89 d8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 f0 0a 00 00 4c 89 f2 48 8b 85 78 fc ff ff 48 c1 ea 03 42 0f b6 14 3a 8b 40 34 <84> d2 74 09 80 fa 03 0f 8e 9a 0a 00 00 4c 89 ea 49 c1 ee 03 41 89 RSP: 0018:ffff88019667e5b8 EFLAGS: 00000a02 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: ffffea0006dd15b4 RCX: ffffffff8199fc75 RDX: 0000000000000004 RSI: 0000000000000004 RDI: ffffea0006dd15b4 RBP: ffff88019667e970 R08: fffff94000dba2b7 R09: fffff94000dba2b6 R10: fffff94000dba2b6 R11: ffffea0006dd15b7 R12: ffff88019667e948 R13: ffff88019667e628 R14: ffff88019667e6c8 R15: dffffc0000000000 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 0c4821a5cf6a854f ]--- 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: ffff88018ff862c0 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: 0000001b32722000 CR3: 00000001b1b6c000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400