Buffer I/O error on dev loop0, logical block 20, async page read
Buffer I/O error on dev loop0, logical block 21, async page read
Buffer I/O error on dev loop0, logical block 22, async page read
Buffer I/O error on dev loop0, logical block 23, async page read
Buffer I/O error on dev loop0, logical block 24, async page read
INFO: task syz-executor7:17339 blocked for more than 120 seconds.
      Not tainted 4.4.125-g38f41ec #21
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor7   D ffff8801c7cc7530 26536 17339   3839 0x20020006
 ffff8801c7cc7530 ffff8801d327a108 0000000000000025 ffff8801d3279800
 ffffffff842bdb00 ffff8801db31fdb8 ffff8801db31fde0 ffff8801db31f4d8
 ffff8801db31f4c0 ffff8801d9b11800 ffff8801d3279800 0000000000000000
Call Trace:
 [<ffffffff8376b82a>] schedule+0x7a/0x1b0 kernel/sched/core.c:3359
 [<ffffffff83776b40>] schedule_timeout+0x3a0/0x970 kernel/time/timer.c:1515
 [<ffffffff837696be>] io_schedule_timeout+0x1be/0x390 kernel/sched/core.c:4941
 [<ffffffff8376caeb>] io_schedule include/linux/sched.h:447 [inline]
 [<ffffffff8376caeb>] bit_wait_io+0x1b/0xc0 kernel/sched/wait.c:595
 [<ffffffff8376c22c>] __wait_on_bit+0x8c/0x140 kernel/sched/wait.c:395
 [<ffffffff8141dcf5>] wait_on_page_bit+0x1e5/0x210 mm/filemap.c:758
 [<ffffffff8141dee3>] wait_on_page_writeback include/linux/pagemap.h:530 [inline]
 [<ffffffff8141dee3>] __filemap_fdatawait_range+0x1c3/0x2e0 mm/filemap.c:410
 [<ffffffff8141e025>] filemap_fdatawait_range+0x25/0x50 mm/filemap.c:440
 [<ffffffff814240e5>] filemap_fdatawait mm/filemap.c:490 [inline]
 [<ffffffff814240e5>] filemap_write_and_wait+0xf5/0x120 mm/filemap.c:507
 [<ffffffff815d35c0>] __sync_blockdev fs/block_dev.c:178 [inline]
 [<ffffffff815d35c0>] sync_blockdev.part.21+0x50/0x70 fs/block_dev.c:187
 [<ffffffff815d3bd4>] sync_blockdev fs/block_dev.c:174 [inline]
 [<ffffffff815d3bd4>] __blkdev_put+0x184/0x7e0 fs/block_dev.c:1522
 [<ffffffff815d50a5>] blkdev_put+0x85/0x550 fs/block_dev.c:1600
 [<ffffffff815d55fb>] blkdev_close+0x8b/0xb0 fs/block_dev.c:1607
 [<ffffffff81523f43>] __fput+0x233/0x6d0 fs/file_table.c:208
 [<ffffffff81524465>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8118bd44>] task_work_run+0x104/0x180 kernel/task_work.c:115
 [<ffffffff8115d824>] get_signal+0x11f4/0x1550 kernel/signal.c:2147
 [<ffffffff8100e7fb>] do_signal+0x8b/0x1d40 arch/x86/kernel/signal.c:712
 [<ffffffff810035fa>] exit_to_usermode_loop+0x11a/0x160 arch/x86/entry/common.c:248
 [<ffffffff81007084>] prepare_exit_to_usermode arch/x86/entry/common.c:283 [inline]
 [<ffffffff81007084>] syscall_return_slowpath arch/x86/entry/common.c:348 [inline]
 [<ffffffff81007084>] do_syscall_32_irqs_on arch/x86/entry/common.c:398 [inline]
 [<ffffffff81007084>] do_fast_syscall_32+0x614/0x8a0 arch/x86/entry/common.c:459
 [<ffffffff8377b2aa>] sysenter_flags_fixed+0xd/0x17
1 lock held by syz-executor7/17339:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff815d3b0c>] __blkdev_put+0xbc/0x7e0 fs/block_dev.c:1516
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 486 Comm: khungtaskd Not tainted 4.4.125-g38f41ec #21
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800bac69800 task.stack: ffff8800bb3e0000
RIP: 0010:[<ffffffff810c3f87>]  [<ffffffff810c3f87>] native_apic_mem_write arch/x86/include/asm/apic.h:94 [inline]
RIP: 0010:[<ffffffff810c3f87>]  [<ffffffff810c3f87>] __default_send_IPI_dest_field arch/x86/include/asm/ipi.h:119 [inline]
RIP: 0010:[<ffffffff810c3f87>]  [<ffffffff810c3f87>] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:61 [inline]
RIP: 0010:[<ffffffff810c3f87>]  [<ffffffff810c3f87>] flat_send_IPI_mask+0xf7/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8800bb3e7cb8  EFLAGS: 00000046
RAX: 0000000003000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fb300
RBP: ffff8800bb3e7ce0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000000000003 R14: ffffffff8426f5a0 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa327609000 CR3: 00000001d2be6000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8426f5a0 ffffffff847f0b40 fffffbfff08fdc1c dffffc0000000000
 ffff8801db31bca0 ffff8800bb3e7d00 ffffffff810b9abb ffffffff839f6dc0
 0000000000000003 ffff8800bb3e7d60 ffffffff81d11764 ffffffff8141b993
Call Trace:
 [<ffffffff810b9abb>] nmi_raise_cpu_backtrace+0x5b/0x70 arch/x86/kernel/apic/hw_nmi.c:33
 [<ffffffff81d11764>] nmi_trigger_all_cpu_backtrace+0x4a4/0x550 lib/nmi_backtrace.c:85
 [<ffffffff810b9b54>] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 [<ffffffff813695ca>] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline]
 [<ffffffff813695ca>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff813695ca>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff813695ca>] watchdog+0x6fa/0xae0 kernel/hung_task.c:238
 [<ffffffff81190b48>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff83779d95>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:510
Code: b3 5f ff f6 c4 10 75 e1 44 89 e8 c1 e0 18 89 04 25 10 b3 5f ff 44 89 fa 09 da 80 cf 04 41 83 ff 02 0f 44 d3 89 14 25 00 b3 5f ff <41> f7 c4 00 02 00 00 74 1a e8 2b 33 17 00 4c 89 e7 57 9d 0f 1f 
NMI backtrace for cpu 1
CPU: 1 PID: 17402 Comm: getty Not tainted 4.4.125-g38f41ec #21
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d3980000 task.stack: ffff8801d9008000
RIP: 0010:[<ffffffff811a4ab2>]  [<ffffffff811a4ab2>] preempt_count_sub+0x42/0x160 kernel/sched/core.c:3101
RSP: 0018:ffff8801d900f7b8  EFLAGS: 00000246
RAX: 0000000000000003 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000004 RSI: ffffffff814fdaf3 RDI: ffffffff85702600
RBP: ffff8801d900f7c0 R08: ffff8801d900f8f8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d900fb18
R13: ffffffffffff8000 R14: ffff8801d900f998 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f60e8e64a30 CR3: 00000001d86a8000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000000 ffff8801d900f7d8 ffffffff812f961a 0000000000000000
 ffff8801d900f7f0 ffffffff8118bf0b 0000000000000000 ffff8801d900f848
 ffffffff81017998 ffff8801d9008000 ffff8801d900fb18 ffff8801d900f8f8
Call Trace:
 [<ffffffff812f961a>] is_module_text_address+0x2a/0x50 kernel/module.c:4105
 [<ffffffff8118bf0b>] __kernel_text_address+0x6b/0xa0 kernel/extable.c:103
 [<ffffffff81017998>] print_context_stack+0x48/0xc0 arch/x86/kernel/dumpstack.c:107
 [<ffffffff81016b75>] dump_trace+0x145/0x350 arch/x86/kernel/dumpstack_64.c:243
 [<ffffffff81035d76>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fdaf3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fe412>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fe412>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
 [<ffffffff814fab57>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff814fab57>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff814fab57>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff814fab57>] kmem_cache_free+0xc7/0x320 mm/slub.c:2881
 [<ffffffff814bef0d>] anon_vma_chain_free mm/rmap.c:129 [inline]
 [<ffffffff814bef0d>] unlink_anon_vmas+0x37d/0x640 mm/rmap.c:415
 [<ffffffff814996ee>] free_pgtables+0x21e/0x330 mm/memory.c:554
 [<ffffffff814b4f93>] exit_mmap+0x1e3/0x3a0 mm/mmap.c:2928
 [<ffffffff811237d8>] __mmput kernel/fork.c:715 [inline]
 [<ffffffff811237d8>] mmput+0xf8/0x2d0 kernel/fork.c:735
 [<ffffffff81133104>] exit_mm kernel/exit.c:444 [inline]
 [<ffffffff81133104>] do_exit+0x714/0x2a10 kernel/exit.c:746
 [<ffffffff811396b8>] do_group_exit+0x108/0x320 kernel/exit.c:889
 [<ffffffff811398ed>] SYSC_exit_group kernel/exit.c:900 [inline]
 [<ffffffff811398ed>] SyS_exit_group+0x1d/0x20 kernel/exit.c:898
 [<ffffffff83779965>] entry_SYSCALL_64_fastpath+0x22/0x9e
Code: 85 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 02 01 00 00 8b 0d 52 db 55 04 85 c9 75 1b <65> 8b 05 d7 1b e7 7e 89 c2 81 e2 ff ff ff 7f 39 d3 7f 14 81 fb