b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
INFO: task syz-executor0:21722 blocked for more than 140 seconds.
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
      Not tainted 4.20.0-rc1-next-20181109+ #110
__find_get_block_slow() failed. block=1, b_blocknr=8
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
syz-executor0   D19800 21722  13122 0x80000006
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
Call Trace:
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
 context_switch kernel/sched/core.c:2831 [inline]
 __schedule+0x8cf/0x21d0 kernel/sched/core.c:3472
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 schedule+0xef/0x370 kernel/sched/core.c:3516
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 __rwsem_down_write_failed_common+0xc9a/0x15e0 kernel/locking/rwsem-xadd.c:577
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:606
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117
b_state=0x00000021, b_size=512
 __down_write arch/x86/include/asm/rwsem.h:142 [inline]
 down_write+0xa5/0x130 kernel/locking/rwsem.c:72
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
 deactivate_super+0x2b3/0x320 fs/super.c:358
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
 cleanup_mnt+0xbf/0x160 fs/namespace.c:1049
 __cleanup_mnt+0x16/0x20 fs/namespace.c:1056
device loop0 blocksize: 4096
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x1a48/0x2620 kernel/exit.c:867
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
 do_group_exit+0x177/0x440 kernel/exit.c:970
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
 get_signal+0x8a8/0x1970 kernel/signal.c:2517
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
 exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
RIP: 0033:0x457569
__find_get_block_slow() failed. block=1, b_blocknr=8
Code: Bad RIP value.
b_state=0x00000021, b_size=512
RSP: 002b:00007fbc01448c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
device loop0 blocksize: 4096
RAX: fffffffffffffe00 RBX: 0000000000000004 RCX: 0000000000457569
__find_get_block_slow() failed. block=1, b_blocknr=8
RDX: 0000000000000001 RSI: 00000000200003c0 RDI: 0000000000000004
b_state=0x00000021, b_size=512
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
device loop0 blocksize: 4096
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbc014496d4
__find_get_block_slow() failed. block=1, b_blocknr=8
R13: 00000000004c37da R14: 00000000004d5b78 R15: 00000000ffffffff
b_state=0x00000021, b_size=512

Showing all locks held in the system:
device loop0 blocksize: 4096
7 locks held by kworker/u4:2/30:
__find_get_block_slow() failed. block=1, b_blocknr=8
1 lock held by khungtaskd/1009:
b_state=0x00000021, b_size=512
 #0: 00000000b608e523 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4379
device loop0 blocksize: 4096
2 locks held by getty/5911:
__find_get_block_slow() failed. block=1, b_blocknr=8
 #0: 0000000073f1dbd9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
 #1: 0000000094ed1fcf (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
__find_get_block_slow() failed. block=1, b_blocknr=8
2 locks held by getty/5912:
b_state=0x00000021, b_size=512
 #0: 000000001cf6dfbd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
device loop0 blocksize: 4096
 #1: 00000000189bf06e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
__find_get_block_slow() failed. block=1, b_blocknr=8
2 locks held by getty/5913:
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 #0: 000000000c84d4fa (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
b_state=0x00000021, b_size=512
 #1: 000000001976b2be (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
2 locks held by getty/5914:
b_state=0x00000021, b_size=512
 #0: 000000009a3f95d3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
device loop0 blocksize: 4096
 #1: 000000007e84f127 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
__find_get_block_slow() failed. block=1, b_blocknr=8
2 locks held by getty/5915:
b_state=0x00000021, b_size=512
 #0: 00000000534bac1d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
device loop0 blocksize: 4096
 #1: 00000000108fd319 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
__find_get_block_slow() failed. block=1, b_blocknr=8
2 locks held by getty/5916:
b_state=0x00000021, b_size=512
 #0: 000000008003464b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 #1: 00000000c9f916db (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
2 locks held by getty/5917:
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 #0: 0000000029a47a47 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
 #1: 000000002ccdf122 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154
__find_get_block_slow() failed. block=1, b_blocknr=8
1 lock held by syz-executor0/21722:
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 #0: 00000000e8b901d6 (&fc->fs_type->s_umount_key#46){++++}, at: deactivate_super+0x2b3/0x320 fs/super.c:358
b_state=0x00000021, b_size=512
1 lock held by syz-executor1/30048:
device loop0 blocksize: 4096
 #0: 00000000e8b901d6 (&fc->fs_type->s_umount_key#46){++++}, at: iterate_supers+0xe2/0x290 fs/super.c:722
__find_get_block_slow() failed. block=1, b_blocknr=8
1 lock held by syz-executor1/30050:
b_state=0x00000021, b_size=512
 #0: 00000000e8b901d6 (&fc->fs_type->s_umount_key#46){++++}, at: iterate_supers+0xe2/0x290 fs/super.c:722
device loop0 blocksize: 4096

__find_get_block_slow() failed. block=1, b_blocknr=8
=============================================

b_state=0x00000021, b_size=512
NMI backtrace for cpu 1
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
CPU: 1 PID: 1009 Comm: khungtaskd Not tainted 4.20.0-rc1-next-20181109+ #110
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
b_state=0x00000021, b_size=512
Call Trace:
device loop0 blocksize: 4096
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x244/0x39d lib/dump_stack.c:113
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
 nmi_cpu_backtrace.cold.2+0x5c/0xa1 lib/nmi_backtrace.c:101
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 nmi_trigger_cpumask_backtrace+0x1e8/0x22a lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_all_cpu_backtrace include/linux/nmi.h:144 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline]
 watchdog+0xb4c/0x1060 kernel/hung_task.c:289
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
device loop0 blocksize: 4096
 kthread+0x35a/0x440 kernel/kthread.c:246
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000021, b_size=512
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 1 to CPUs 0:
device loop0 blocksize: 4096
NMI backtrace for cpu 0
CPU: 0 PID: 30 Comm: kworker/u4:2 Not tainted 4.20.0-rc1-next-20181109+ #110
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.952 msecs
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:__test_and_clear_bit arch/x86/include/asm/bitops.h:289 [inline]
RIP: 0010:__collect_expired_timers kernel/time/timer.c:1380 [inline]
RIP: 0010:collect_expired_timers kernel/time/timer.c:1615 [inline]
RIP: 0010:__run_timers+0x332/0xc60 kernel/time/timer.c:1678
Code: 48 fd ff ff 48 89 85 68 fd ff ff e8 c8 18 13 00 44 89 e2 89 d8 c1 e0 06 83 e2 3f 44 8d 34 02 48 8b 85 60 fd ff ff 4c 0f b3 30 <41> 0f 92 c7 31 ff 44 89 fe e8 70 19 13 00 45 84 ff 0f 84 a7 00 00
RSP: 0018:ffff8801dae07978 EFLAGS: 00000006
RAX: ffff8801dae23c18 RBX: 0000000000000001 RCX: ffffffff816c90f7
RDX: 000000000000002e RSI: ffffffff816c8fe8 RDI: 0000000000000005
RBP: ffff8801dae07c60 R08: ffff8801d94ee080 R09: ffffed003b5c0f1c
R10: ffffed003b5c0f1c R11: 0000000000000003 R12: 0000000020001cae
R13: dffffc0000000000 R14: 000000000000006e R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c4312df000 CR3: 00000001cda29000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 run_timer_softirq+0x52/0xb0 kernel/time/timer.c:1695
 __do_softirq+0x308/0xb7e kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x17f/0x1c0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x1cb/0x760 arch/x86/kernel/apic/apic.c:1061
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:804
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:761 [inline]
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1688 [inline]
RIP: 0010:vprintk_emit+0x87d/0x990 kernel/printk/printk.c:1921
Code: 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 de 00 00 00 48 83 3d 73 69 ec 07 00 74 34 e8 6c 16 1a 00 48 8b bd 90 fe ff ff 57 9d <0f> 1f 44 00 00 e9 aa fe ff ff e8 54 16 1a 00 0f 0b e8 4d 16 1a 00
RSP: 0018:ffff8801d94fdf50 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: ffff8801d94ee080 RBX: 1ffff1003b29fbf0 RCX: 1ffff1003b29dd33
RDX: 0000000000000000 RSI: ffffffff81659244 RDI: 0000000000000293
RBP: ffff8801d94fe0c8 R08: ffff8801d94ee998 R09: 0000000000000006
R10: 0000000000000000 R11: ffff8801d94ee080 R12: 0000000000000200
R13: 0000000000000000 R14: ffffed003b29fc04 R15: ffff8801d94fe0a0
 vprintk_default+0x28/0x30 kernel/printk/printk.c:1964
 vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398
 printk+0xa7/0xcf kernel/printk/printk.c:1997
 __find_get_block_slow fs/buffer.c:237 [inline]
 __find_get_block.cold.58+0xd8/0xff fs/buffer.c:1325
 __getblk_slow fs/buffer.c:1058 [inline]
 __getblk_gfp+0x3d3/0x1030 fs/buffer.c:1351
 __bread_gfp+0x2d/0x310 fs/buffer.c:1385
 sb_bread include/linux/buffer_head.h:307 [inline]
 __fat_write_inode+0x347/0xb60 fs/fat/inode.c:860
 fat_write_inode+0x97/0x180 fs/fat/inode.c:909
 write_inode fs/fs-writeback.c:1176 [inline]
 __writeback_single_inode+0xf4a/0x1650 fs/fs-writeback.c:1375
 writeback_sb_inodes+0x71f/0x1210 fs/fs-writeback.c:1580
 __writeback_inodes_wb+0x1b9/0x340 fs/fs-writeback.c:1649
 wb_writeback+0xa5d/0xfa0 fs/fs-writeback.c:1758
 wb_check_start_all fs/fs-writeback.c:1882 [inline]
 wb_do_writeback fs/fs-writeback.c:1908 [inline]
 wb_workfn+0xedf/0x1780 fs/fs-writeback.c:1942
 process_one_work+0xc8b/0x1c40 kernel/workqueue.c:2153
 ? find_held_lock+0x
Lost 29 message(s)!