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
INFO: task syz-executor0:15476 blocked for more than 140 seconds.
      Not tainted 4.19.0-rc7+ #280
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
syz-executor0   D19208 15476   8471 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
 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:595
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
 __down_write arch/x86/include/asm/rwsem.h:142 [inline]
 down_write+0xa5/0x130 kernel/locking/rwsem.c:72
kvm [18598]: vcpu0, guest rIP: 0x102 disabled perfctr wrmsr: 0xc1 data 0x50a
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
kvm [18598]: vcpu0, guest rIP: 0x102 disabled perfctr wrmsr: 0xc2 data 0x50a
 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
kvm [18598]: vcpu0, guest rIP: 0x102 ignored wrmsr: 0x11e data 0x50a
__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
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
kvm [18598]: vcpu0, guest rIP: 0x102 disabled perfctr wrmsr: 0x186 data 0x50a
 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
kvm [18598]: vcpu0, guest rIP: 0x102 disabled perfctr wrmsr: 0x187 data 0x50a
 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
dccp_invalid_packet: P.type (REQUEST) not Data || [Data]Ack, while P.X == 0
__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
 do_group_exit+0x177/0x440 kernel/exit.c:970
dccp_invalid_packet: P.type (REQUEST) not Data || [Data]Ack, while P.X == 0
__find_get_block_slow() failed. block=1, b_blocknr=8
 get_signal+0x8b0/0x1980 kernel/signal.c:2513
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
 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
 exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162
__find_get_block_slow() failed. block=1, b_blocknr=8
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
__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
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
RIP: 0033:0x457569
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
Code: Bad RIP value.
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
RSP: 002b:00007f54a098ecf8 EFLAGS: 00000246
b_state=0x00000029, b_size=512
 ORIG_RAX: 00000000000000ca
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
RAX: fffffffffffffe00 RBX: 000000000072bf08 RCX: 0000000000457569
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000072bf08
__find_get_block_slow() failed. block=1, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000072bf0c
__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
R13: 00007fffe6dec6ef R14: 00007f54a098f9c0 R15: 0000000000000000
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8

Showing all locks held in the system:
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
3 locks held by kworker/u4:3/280:
b_state=0x00000029, b_size=512
1 lock held by khungtaskd/982:
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
 #0: 
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
000000008b97a18a
 (
rcu_read_lock
__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
){....}
, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4435
__find_get_block_slow() failed. block=1, b_blocknr=8
1 lock held by rsyslogd/5216:
b_state=0x00000029, b_size=512
 #0: 
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
00000000e1a51a78
b_state=0x00000029, b_size=512
 (
device loop0 blocksize: 4096
&f->f_pos_lock
__find_get_block_slow() failed. block=1, b_blocknr=8
){+.+.}
b_state=0x00000029, b_size=512
, at: __fdget_pos+0x1bb/0x200 fs/file.c:766
device loop0 blocksize: 4096
2 locks held by getty/5306:
__find_get_block_slow() failed. block=1, b_blocknr=8
 #0: 00000000ee662465 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 0000000075b915b8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5307:
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 #0: 
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
00000000859dfc23 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
 #1: 
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
00000000054289e2
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
&ldata->atomic_read_lock
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
, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
2 locks held by getty/5308:
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 #0: 
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
00000000af8b829c
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
&tty->ldisc_sem
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
, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 #1: 00000000a187edd1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5309:
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 #0: 
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
0000000048257148
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
&tty->ldisc_sem
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
, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 #1: 
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
0000000012732e41
b_state=0x00000029, b_size=512
 (
device loop0 blocksize: 4096
&ldata->atomic_read_lock
){+.+.}
__find_get_block_slow() failed. block=1, b_blocknr=8
, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
b_state=0x00000029, b_size=512
2 locks held by getty/5310:
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 #0: 
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
000000005e545e91
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
&tty->ldisc_sem
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
, 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: 
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
000000009c4583c7
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
&ldata->atomic_read_lock
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
, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
2 locks held by getty/5311:
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 #0: 
b_state=0x00000029, b_size=512
00000000933fa49f
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
&tty->ldisc_sem
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
){++++}
b_state=0x00000029, b_size=512
, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
device loop0 blocksize: 4096
 #1: 
__find_get_block_slow() failed. block=1, b_blocknr=8
0000000024ad7bf0
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
&ldata->atomic_read_lock
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
, 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/5312:
b_state=0x00000029, b_size=512
 #0: 
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
00000000710fc8d1
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
&tty->ldisc_sem
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
){++++}
__find_get_block_slow() failed. block=1, b_blocknr=8
, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
 #1: 
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
00000000b8154b50
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
&ldata->atomic_read_lock
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
, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
__find_get_block_slow() failed. block=1, b_blocknr=8
7 locks held by kworker/u4:2/2247:
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
1 lock held by syz-executor0/15476:
device loop0 blocksize: 4096
 #0: 
__find_get_block_slow() failed. block=1, b_blocknr=8
00000000e9804b33
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
&type->s_umount_key
device loop0 blocksize: 4096
#79
__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
, at: deactivate_super+0x2b3/0x320 fs/super.c:359
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
1 lock held by syz-executor3/18571:
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
 #0: 
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
00000000f52c61d5
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
&mm->mmap_sem
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
, at: vm_mmap_pgoff+0x1b5/0x2c0 mm/util.c:355
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
2 locks held by syz-executor3/18576:
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
 #0: 
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
00000000f52c61d5
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
&mm->mmap_sem
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
, at: vm_mmap_pgoff+0x1b5/0x2c0 mm/util.c:355
__find_get_block_slow() failed. block=1, b_blocknr=8
 #1: 
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
00000000987f9967
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
&event->mmap_mutex
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
, at: perf_mmap+0x84f/0x1a80 kernel/events/core.c:5646
__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
NMI backtrace for cpu 1
b_state=0x00000029, b_size=512
device loop0 blocksize: 4096
__find_get_block_slow() failed. block=1, b_blocknr=8
CPU: 1 PID: 982 Comm: khungtaskd Not tainted 4.19.0-rc7+ #280
b_state=0x00000029, b_size=512
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c4/0x2b4 lib/dump_stack.c:113
device loop0 blocksize: 4096
 nmi_cpu_backtrace.cold.3+0x63/0xa2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1b3/0x1ed 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:204 [inline]
 watchdog+0xb3e/0x1050 kernel/hung_task.c:265
 kthread+0x35a/0x420 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.733 msecs
CPU: 0 PID: 17568 Comm: kworker/u4:1 Not tainted 4.19.0-rc7+ #280
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-8:0)
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x4/0x20 kernel/kcov.c:194
Code: 66 0f 1f 44 00 00 55 89 f2 89 fe bf 05 00 00 00 48 89 e5 48 8b 4d 08 e8 6a fe ff ff 5d c3 0f 1f 84 00 00 00 00 00 55 48 89 f2 <48> 89 fe bf 07 00 00 00 48 89 e5 48 8b 4d 08 e8 48 fe ff ff 5d c3
RSP: 0018:ffff88018f81d9c8 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff88018f81de90 RCX: 1ffff10031f03bca
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88018f81deb8 R08: ffff8801cec02080 R09: ffffed0036e34317
R10: ffffed0036e34317 R11: ffff8801b71a18bb R12: ffffea0005087d00
R13: ffffea0005087d08 R14: ffffea0005087d00 R15: ffffea0005087d00
FS:  0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f187629a000 CR3: 00000001c0b0f000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 set_page_writeback include/linux/page-flags.h:497 [inline]
 ext4_bio_write_page+0x505/0x1bd0 fs/ext4/page-io.c:432
 mpage_submit_page+0x15e/0x270 fs/ext4/inode.c:2207
 mpage_map_and_submit_buffers+0x55e/0xa40 fs/ext4/inode.c:2404
 mpage_map_and_submit_extent fs/ext4/inode.c:2542 [inline]
 ext4_writepages+0x27d0/0x4110 fs/ext4/inode.c:2854
 do_writepages+0x9a/0x1a0 mm/page-writeback.c:2340
 __writeback_single_inode+0x20a/0x1620 fs/fs-writeback.c:1323
 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
 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296
 kthread+0x35a/0x420 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
__find_get_block_slow() failed. block=1, b_blocknr=8