device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
INFO: task syz-executor0:14752 blocked for more than 140 seconds.
b_state=0x00000029, b_size=512
      Not tainted 4.19.0-rc4+ #27
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
syz-executor0   D20312 14752  12021 0x80000002
Call Trace:
 context_switch kernel/sched/core.c:2825 [inline]
 __schedule+0x86c/0x1ed0 kernel/sched/core.c:3473
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
 schedule+0xfe/0x460 kernel/sched/core.c:3517
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
 __rwsem_down_write_failed_common+0xbb9/0x1670 kernel/locking/rwsem-xadd.c:566
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:595
device loop0 blocksize: 4096
 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117
 __down_write arch/x86/include/asm/rwsem.h:142 [inline]
 down_write+0xa5/0x130 kernel/locking/rwsem.c:72
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
 deactivate_super+0x2b3/0x320 fs/super.c:359
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
 cleanup_mnt+0xbf/0x160 fs/namespace.c:1098
 __cleanup_mnt+0x16/0x20 fs/namespace.c:1105
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x1ad7/0x2610 kernel/exit.c:867
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 do_group_exit+0x177/0x440 kernel/exit.c:970
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
 get_signal+0x8b0/0x1980 kernel/signal.c:2513
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
 do_signal+0x9c/0x21e0 arch/x86/kernel/signal.c:816
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
 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
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
RIP: 0033:0x457679
device loop0 blocksize: 4096
Code: Bad RIP value.
__find_get_block_slow() failed. block=1, b_blocknr=8
RSP: 002b:00007f6990d53cf8 EFLAGS: 00000246
b_state=0x00000029, b_size=512
 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000072bfa8 RCX: 0000000000457679
device loop0 blocksize: 4096
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000072bfa8
RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000072bfac
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
R13: 00007fff730ccfbf R14: 00007f6990d549c0 R15: 0000000000000001

Showing all locks held in the system:
__find_get_block_slow() failed. block=1, b_blocknr=8
7 locks held by kworker/u4:2/32:
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
1 lock held by khungtaskd/975:
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
 #0: 
__find_get_block_slow() failed. block=1, b_blocknr=8
000000005b72951f
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 (
b_state=0x00000029, b_size=512
rcu_read_lock
device loop0 blocksize: 4096
){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4435
1 lock held by rsyslogd/5160:
 #0: 000000009ac09a9c (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766
2 locks held by getty/5251:
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
 #0: 0000000004e8b2f4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
device loop0 blocksize: 4096
 #1: 00000000c277bc9c
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
 (
device loop0 blocksize: 4096
&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5252:
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
 #0: 00000000a18a3940 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
device loop0 blocksize: 4096
 #1: 000000002c3fe038 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
__find_get_block_slow() failed. block=1, b_blocknr=8
2 locks held by getty/5253:
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 #0: 000000001946ef33 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
 #1: 00000000c60acda4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5254:
__find_get_block_slow() failed. block=1, b_blocknr=8
 #0: 00000000b75a6171
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 000000008f8d3f9f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
2 locks held by getty/5255:
 #0: 000000000502c4d8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
__find_get_block_slow() failed. block=1, b_blocknr=8
 #1: 
b_state=0x00000029, b_size=512
000000006bab3aed
device loop0 blocksize: 4096
 (&ldata->atomic_read_lock
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
){+.+.}
device loop0 blocksize: 4096
, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5256:
 #0: 000000000bf7d538 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
 #1: 00000000ce9175ee (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
__find_get_block_slow() failed. block=1, b_blocknr=8
2 locks held by getty/5257:
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
 #0: 0000000011b350e7 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 00000000800bfe1d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
__find_get_block_slow() failed. block=1, b_blocknr=8
1 lock held by syz-executor0/14752:
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 #0: 000000001f9f2e89 (&type->s_umount_key#57){++++}
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
, at: deactivate_super+0x2b3/0x320 fs/super.c:359
1 lock held by syz-executor0/24129:
__find_get_block_slow() failed. block=1, b_blocknr=8
1 lock held by syz-executor0/24132:
b_state=0x00000029, b_size=512

device loop0 blocksize: 4096
=============================================

__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
NMI backtrace for cpu 0
b_state=0x00000029, b_size=512
CPU: 0 PID: 975 Comm: khungtaskd Not tainted 4.19.0-rc4+ #27
device loop0 blocksize: 4096
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__find_get_block_slow() failed. block=1, b_blocknr=8
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c4/0x2b4 lib/dump_stack.c:113
b_state=0x00000029, b_size=512
 nmi_cpu_backtrace.cold.3+0x63/0xa2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1b3/0x1ed lib/nmi_backtrace.c:62
device loop0 blocksize: 4096
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
__find_get_block_slow() failed. block=1, b_blocknr=8
 trigger_all_cpu_backtrace include/linux/nmi.h:144 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline]
 watchdog+0xb3e/0x1050 kernel/hung_task.c:265
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
 kthread+0x35a/0x420 kernel/kthread.c:246
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
Sending NMI from CPU 0 to CPUs 1:
device loop0 blocksize: 4096
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.079 msecs
NMI backtrace for cpu 1
CPU: 1 PID: 32 Comm: kworker/u4:2 Not tainted 4.19.0-rc4+ #27
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:335 [inline]
RIP: 0010:cpumask_test_cpu include/linux/cpumask.h:344 [inline]
RIP: 0010:trace_lock_release include/trace/events/lock.h:58 [inline]
RIP: 0010:lock_release+0x1b5/0x970 kernel/locking/lockdep.c:3918
Code: c7 84 24 7c 08 00 00 01 00 00 00 0f 1f 44 00 00 65 8b 05 4e 86 a0 7e 83 f8 3f 0f 87 e5 05 00 00 89 c0 48 0f a3 05 eb 63 d0 08 <0f> 82 01 05 00 00 4d 8d a5 40 ff ff ff 48 c7 c7 00 77 93 89 48 b8
RSP: 0018:ffff8801dad07828 EFLAGS: 00000093
RAX: 0000000000000001 RBX: 1ffff1003b5a0f09 RCX: ffffffff816c3734
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8801d951897c
RBP: ffff8801dad07950 R08: 0000000000000000 R09: ffffed003b5a4740
R10: ffffed003b5a4740 R11: ffff8801dad23a03 R12: ffff8801d9518100
R13: ffff8801dad07928 R14: 00000000ffffffff R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801dad00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001ebf978 CR3: 00000001bc21a000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:166 [inline]
 _raw_spin_unlock_irq+0x1a/0x80 kernel/locking/spinlock.c:192
 __run_timers+0xa20/0xc70 kernel/time/timer.c:1685
 run_timer_softirq+0x52/0xb0 kernel/time/timer.c:1695
 __do_softirq+0x30b/0xad8 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:372 [inline]
 irq_exit+0x17f/0x1c0 kernel/softirq.c:412
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x1cb/0x760 arch/x86/kernel/apic/apic.c:1056
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:864
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:788 [inline]
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1684 [inline]
RIP: 0010:vprintk_emit+0x824/0x930 kernel/printk/printk.c:1921
Code: 00 00 00 00 fc ff df 41 80 3c 04 00 0f 85 c5 00 00 00 48 83 3d 04 56 ed 07 00 74 2d e8 55 ff 19 00 48 8b bd 90 fe ff ff 57 9d <0f> 1f 44 00 00 e9 68 fe ff ff e8 3d ff 19 00 0f 0b e8 36 ff 19 00
RSP: 0018:ffff8801d9525f70 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: ffff8801d9518100 RBX: 1ffff1003b2a4bf4 RCX: 1ffff1003b2a3143
RDX: 0000000000000000 RSI: ffffffff8164e4cb RDI: 0000000000000293
RBP: ffff8801d95260e8 R08: ffff8801d9518a18 R09: 0000000000000006
R10: 0000000000000000 R11: ffff8801d9518100 R12: 1ffffffff12a4759
R13: 0000000000000200 R14: ffff8801d95260c0 R15: 0000000000000000
 vprintk_default+0x28/0x30 kernel/printk/printk.c:1963
 vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398
 printk+0xa7/0xcf kernel/printk/printk.c:1996
 __find_get_block_slow fs/buffer.c:237 [inline]
 __find_get_block.cold.57+0xd8/0xff fs/buffer.c:1294
 __getblk_slow fs/buffer.c:1039 [inline]
 __getblk_gfp+0x2b3/0xd50 fs/buffer.c:1320
 __bread_gfp+0x2d/0x300 fs/buffer.c:1354
 sb_bread include/linux/buffer_head.h:307 [inline]
 __fat_write_inode+0x347/0xb60 fs/fat/inode.c:859
 fat_write_inode+0x97/0x180 fs/fat/inode.c:908
 write_inode fs/fs-writeback.c:1183 [inline]
 __writeback_single_inode+0xf1f/0x1620 fs/fs-writeback.c:1382
 writeback_sb_inodes+0x71f/0x11d0 fs/fs-writeback.c:1587
 __writeback_inodes_wb+0x1b9/0x340 fs/fs-writeback.c:1656
 wb_writeback+0xa73/0xfc0 fs/fs-writeback.c:1765
 wb_check_old_data_flush fs/fs-writeback.c:1867 [inline]
 wb_do_writeback fs/fs-writeback.c:1920 [inline]
 wb_workfn+0x1008/0x1790 fs/fs-writeback.c:1949
 process_one_work+0xc90/0x1b90 kernel/workqueue.c:2153
 ? __switch_to
Lost 43 message(s)!