INFO: task syz.1.1337:10284 blocked for more than 430 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.1337      state:D stack:0     pid:10284 tgid:10283 ppid:9429   task_flags:0x400140 flags:0x00000001
Call trace: 
[<81a3e01c>] (__schedule) from [<81a3efb0>] (__schedule_loop kernel/sched/core.c:7043 [inline])
[<81a3e01c>] (__schedule) from [<81a3efb0>] (schedule+0x2c/0x130 kernel/sched/core.c:7058)
 r10:8384de80 r9:8384dd00 r8:8483d9f8 r7:8483d9f8 r6:dfac9c68 r5:dfac9cb8
 r4:83a90c00
[<81a3ef84>] (schedule) from [<80731690>] (request_wait_answer fs/fuse/dev.c:565 [inline])
[<81a3ef84>] (schedule) from [<80731690>] (__fuse_request_send fs/fuse/dev.c:579 [inline])
[<81a3ef84>] (schedule) from [<80731690>] (__fuse_simple_request+0x348/0x498 fs/fuse/dev.c:673)
 r5:dfac9cb8 r4:8483d9a0
[<80731348>] (__fuse_simple_request) from [<8073acc4>] (fuse_simple_request fs/fuse/fuse_i.h:1244 [inline])
[<80731348>] (__fuse_simple_request) from [<8073acc4>] (fuse_send_open fs/fuse/file.c:52 [inline])
[<80731348>] (__fuse_simple_request) from [<8073acc4>] (fuse_file_open+0x180/0x230 fs/fuse/file.c:147)
 r8:85ba7200 r7:00000001 r6:00000000 r5:00000001 r4:849d8f40
[<8073ab44>] (fuse_file_open) from [<8073ad9c>] (fuse_do_open+0x28/0x3c fs/fuse/file.c:176)
 r10:85bbbb40 r9:00000000 r8:85bbbb68 r7:849d8f40 r6:85bbbb40 r5:85043900
 r4:85bbbb40
[<8073ad74>] (fuse_do_open) from [<807348b4>] (fuse_dir_open+0x60/0xb0 fs/fuse/dir.c:1707)
 r4:00000000
[<80734854>] (fuse_dir_open) from [<8054e3e0>] (do_dentry_open+0x2c0/0x4d0 fs/open.c:965)
 r7:80734854 r6:85043900 r5:00000000 r4:85bbbb40
[<8054e120>] (do_dentry_open) from [<80550148>] (vfs_open+0x2c/0xe8 fs/open.c:1095)
 r9:00000000 r8:dfac9e58 r7:00000000 r6:85bbbb68 r5:8291ed6c r4:85bbbb40
[<8055011c>] (vfs_open) from [<80568c3c>] (do_open fs/namei.c:3887 [inline])
[<8055011c>] (vfs_open) from [<80568c3c>] (path_openat+0x30c/0x1150 fs/namei.c:4046)
 r6:dfac9f20 r5:8291ed6c r4:00000000
[<80568930>] (path_openat) from [<80569b2c>] (do_filp_open+0xac/0x148 fs/namei.c:4073)
 r10:00000142 r9:8621e000 r8:00000001 r7:dfac9e58 r6:dfac9f20 r5:83a90c00
 r4:ffffff9c
[<80569a80>] (do_filp_open) from [<805506a8>] (do_sys_openat2+0x90/0xe0 fs/open.c:1435)
 r9:83a90c00 r8:8020029c r7:ffffff9c r6:dfac9f58 r5:8621e000 r4:00000004
[<80550618>] (do_sys_openat2) from [<80550ad0>] (do_sys_open fs/open.c:1450 [inline])
[<80550618>] (do_sys_openat2) from [<80550ad0>] (__do_sys_openat fs/open.c:1466 [inline])
[<80550618>] (do_sys_openat2) from [<80550ad0>] (sys_openat+0x98/0xd4 fs/open.c:1461)
 r7:00000142 r6:0031630c r5:20004280 r4:ffffff9c
[<80550a38>] (sys_openat) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfac9fa8 to 0xdfac9ff0)
9fa0:                   00000000 00000000 ffffff9c 20004280 00000000 00000040
9fc0: 00000000 00000000 0031630c 00000142 00300000 00000000 00006364 76fc40bc
9fe0: 76fc3ec0 76fc3eb0 000195a4 00132510
 r5:00000000 r4:00000000
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 32 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT 
Hardware name: ARM-Versatile Express
Call trace: 
[<80201a24>] (dump_backtrace) from [<80201b20>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:00000000 r6:000f0013 r5:600f0093 r4:82260e74
[<80201b08>] (show_stack) from [<8021fc60>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201b08>] (show_stack) from [<8021fc60>] (dump_stack_lvl+0x70/0x7c lib/dump_stack.c:120)
[<8021fbf0>] (dump_stack_lvl) from [<8021fc84>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r5:00000001 r4:00000001
[<8021fc6c>] (dump_stack) from [<81a27c30>] (nmi_cpu_backtrace+0x160/0x17c lib/nmi_backtrace.c:113)
[<81a27ad0>] (nmi_cpu_backtrace) from [<81a27d7c>] (nmi_trigger_cpumask_backtrace+0x130/0x1d8 lib/nmi_backtrace.c:62)
 r7:00000001 r6:8280c690 r5:8281ac94 r4:ffffffff
[<81a27c4c>] (nmi_trigger_cpumask_backtrace) from [<802304fc>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:852)
 r9:82abd56c r8:82804d40 r7:00022c00 r6:00007f43 r5:8281b248 r4:83241d0c
[<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037d958>] (trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline])
[<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037d958>] (check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline])
[<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037d958>] (watchdog+0x4d4/0x81c kernel/hung_task.c:491)
[<8037d484>] (watchdog) from [<80281fcc>] (kthread+0x12c/0x280 kernel/kthread.c:463)
 r10:00000000 r9:00000000 r8:8037d484 r7:830cf700 r6:830cf700 r5:83221800
 r4:00000001
[<80281ea0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xdf8e1fb0 to 0xdf8e1ff8)
1fa0:                                     00000000 00000000 00000000 00000000
1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
1fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80281ea0
 r4:833a5cc0
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 2845 Comm: pr/ttyAMA-1 Not tainted syzkaller #0 PREEMPT 
Hardware name: ARM-Versatile Express
PC is at __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
PC is at _raw_spin_unlock_irqrestore+0x28/0x54 kernel/locking/spinlock.c:194
LR is at spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
LR is at __uart_port_unlock_irqrestore include/linux/serial_core.h:616 [inline]
LR is at pl011_console_device_unlock+0x20/0x24 drivers/tty/serial/amba-pl011.c:2603
pc : [<81a47fe4>]    lr : [<80a79fc8>]    psr: 600f0113
sp : eb925eb0  ip : eb925ec0  fp : eb925ebc
r10: 82959154  r9 : 00000000  r8 : 00000000
r7 : 00000117  r6 : 829590b8  r5 : 00000000  r4 : 00000001
r3 : 00001377  r2 : 00000000  r1 : 600f0113  r0 : 84af5440
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 84d06880  DAC: fffffffd
Call trace: 
[<81a47fbc>] (_raw_spin_unlock_irqrestore) from [<80a79fc8>] (spin_unlock_irqrestore include/linux/spinlock.h:406 [inline])
[<81a47fbc>] (_raw_spin_unlock_irqrestore) from [<80a79fc8>] (__uart_port_unlock_irqrestore include/linux/serial_core.h:616 [inline])
[<81a47fbc>] (_raw_spin_unlock_irqrestore) from [<80a79fc8>] (pl011_console_device_unlock+0x20/0x24 drivers/tty/serial/amba-pl011.c:2603)
[<80a79fa8>] (pl011_console_device_unlock) from [<802e456c>] (nbcon_emit_one+0x88/0x100 kernel/printk/nbcon.c:1142)
[<802e44e4>] (nbcon_emit_one) from [<802e478c>] (nbcon_kthread_func+0x1a8/0x2a4 kernel/printk/nbcon.c:1229)
 r6:8280c690 r5:83bfc800 r4:829590b8
[<802e45e4>] (nbcon_kthread_func) from [<80281fcc>] (kthread+0x12c/0x280 kernel/kthread.c:463)
 r10:00000000 r9:829590b8 r8:802e45e4 r7:8432b380 r6:8432b380 r5:83bfc800
 r4:00000001
[<80281ea0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xeb925fb0 to 0xeb925ff8)
5fa0:                                     00000000 00000000 00000000 00000000
5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80281ea0
 r4:8407e840