INFO: task syz.0.242:4629 blocked for more than 430 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.242       state:D stack:0     pid:4629  tgid:4629  ppid:3097   task_flags:0x400040 flags:0x00000005
Call trace: 
[<81b1a8bc>] (__schedule) from [<81b1bd50>] (__schedule_loop kernel/sched/core.c:7268 [inline])
[<81b1a8bc>] (__schedule) from [<81b1bd50>] (schedule+0x2c/0x134 kernel/sched/core.c:7283)
 r10:858a6280 r9:839b9900 r8:833d1400 r7:852f9d08 r6:ea745ea8 r5:ea745e50
 r4:839b9900
[<81b1bd24>] (schedule) from [<8078346c>] (request_wait_answer fs/fuse/dev.c:590 [inline])
[<81b1bd24>] (schedule) from [<8078346c>] (__fuse_request_send fs/fuse/dev.c:604 [inline])
[<81b1bd24>] (schedule) from [<8078346c>] (__fuse_simple_request+0x3b8/0x520 fs/fuse/dev.c:699)
 r5:ea745e50 r4:852f9cb0
[<807830b4>] (__fuse_simple_request) from [<8078c9e0>] (fuse_simple_request fs/fuse/fuse_i.h:1262 [inline])
[<807830b4>] (__fuse_simple_request) from [<8078c9e0>] (fuse_flush+0x178/0x1b4 fs/fuse/file.c:500)
 r8:861fb580 r7:86145cc0 r6:838b0300 r5:837a0b40 r4:858a6280
[<8078c868>] (fuse_flush) from [<8058053c>] (filp_flush+0x38/0x88 fs/open.c:1467)
 r8:838b0340 r7:8604f1c0 r6:0000001e r5:838b0300 r4:858a6280
[<80580504>] (filp_flush) from [<805805a0>] (filp_close+0x14/0x28 fs/open.c:1480)
 r7:8604f1c0 r6:0000001e r5:858a6280 r4:838b0300
[<8058058c>] (filp_close) from [<805b28a8>] (__range_close fs/file.c:794 [inline])
[<8058058c>] (filp_close) from [<805b28a8>] (__do_sys_close_range fs/file.c:855 [inline])
[<8058058c>] (filp_close) from [<805b28a8>] (sys_close_range+0x18c/0x224 fs/file.c:819)
 r5:00000004 r4:838b0300
[<805b271c>] (sys_close_range) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xea745fa8 to 0xea745ff0)
5fa0:                   00000000 00000000 00000003 0000001e 00000000 7eb6a918
5fc0: 00000000 00000000 00000000 000001b4 000393d5 ffffffff 00000000 003462e4
5fe0: 7eb6a840 7eb6a830 0002853c 00130810
 r10:000001b4 r9:839b9900 r8:8020029c r7:000001b4 r6:00000000 r5:00000000
 r4:00000000
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 29 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: ARM-Versatile Express
Call trace: 
[<80201a14>] (dump_backtrace) from [<80201b08>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:600f0093 r6:600f0093 r5:8231e924 r4:00000000
[<80201af0>] (show_stack) from [<8021e384>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201af0>] (show_stack) from [<8021e384>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120)
[<8021e328>] (dump_stack_lvl) from [<8021e3b0>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r7:00000000 r6:000f0013 r5:00000001 r4:00000001
[<8021e398>] (dump_stack) from [<81b04194>] (nmi_cpu_backtrace+0x150/0x170 lib/nmi_backtrace.c:113)
[<81b04044>] (nmi_cpu_backtrace) from [<81b042e4>] (nmi_trigger_cpumask_backtrace+0x130/0x1d8 lib/nmi_backtrace.c:62)
 r7:00000001 r6:82a0b550 r5:82a1a2b8 r4:ffffffff
[<81b041b4>] (nmi_trigger_cpumask_backtrace) from [<8022f104>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:852)
 r9:82a0b6d8 r8:00000048 r7:0000000a r6:82a03d80 r5:00007f30 r4:00000048
[<8022f0ec>] (arch_trigger_cpumask_backtrace) from [<81b0be30>] (trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline])
[<8022f0ec>] (arch_trigger_cpumask_backtrace) from [<81b0be30>] (__sys_info lib/sys_info.c:157 [inline])
[<8022f0ec>] (arch_trigger_cpumask_backtrace) from [<81b0be30>] (sys_info+0x68/0xa8 lib/sys_info.c:165)
[<81b0bdc8>] (sys_info) from [<8038ac04>] (check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline])
[<81b0bdc8>] (sys_info) from [<8038ac04>] (watchdog+0x3ac/0x858 kernel/hung_task.c:561)
 r5:00007f30 r4:00000001
[<8038a858>] (watchdog) from [<80281550>] (kthread+0x11c/0x154 kernel/kthread.c:436)
 r10:00000000 r9:df819e58 r8:83352680 r7:00000000 r6:8038a858 r5:833a0c80
 r4:831f7480
[<80281434>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xdf8d5fb0 to 0xdf8d5ff8)
5fa0:                                     00000000 00000000 00000000 00000000
5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80281434 r4:831f7480
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 2815 Comm: pr/ttyAMA-1 Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: ARM-Versatile Express
PC is at __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
PC is at _raw_spin_unlock_irqrestore+0x28/0x54 kernel/locking/spinlock.c:198
LR is at spin_unlock_irqrestore include/linux/spinlock.h:408 [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:2668
pc : [<81b25178>]    lr : [<80ae8aac>]    psr: 60030113
sp : eb3fdec8  ip : eb3fded8  fp : eb3fded4
r10: 82b59724  r9 : 00000000  r8 : 00000000
r7 : 00000117  r6 : 82b59688  r5 : 00000000  r4 : 00000001
r3 : 00001368  r2 : 00000000  r1 : 60030113  r0 : 846eb840
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 858c1740  DAC: fffffffd
Call trace: 
[<81b25150>] (_raw_spin_unlock_irqrestore) from [<80ae8aac>] (spin_unlock_irqrestore include/linux/spinlock.h:408 [inline])
[<81b25150>] (_raw_spin_unlock_irqrestore) from [<80ae8aac>] (__uart_port_unlock_irqrestore include/linux/serial_core.h:616 [inline])
[<81b25150>] (_raw_spin_unlock_irqrestore) from [<80ae8aac>] (pl011_console_device_unlock+0x20/0x24 drivers/tty/serial/amba-pl011.c:2668)
[<80ae8a8c>] (pl011_console_device_unlock) from [<802e8ae8>] (nbcon_emit_one+0x88/0x100 kernel/printk/nbcon.c:1165)
[<802e8a60>] (nbcon_emit_one) from [<802e8d68>] (nbcon_kthread_func+0x208/0x2ec kernel/printk/nbcon.c:1271)
 r6:82cc02d4 r5:82b59688 r4:8401be80
[<802e8b60>] (nbcon_kthread_func) from [<80281550>] (kthread+0x11c/0x154 kernel/kthread.c:436)
 r10:00000000 r9:ea695b38 r8:84d03e00 r7:82b59688 r6:802e8b60 r5:8401be80
 r4:84d396c0
[<80281434>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xeb3fdfb0 to 0xeb3fdff8)
dfa0:                                     00000000 00000000 00000000 00000000
dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
dfe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80281434 r4:84d396c0