INFO: task syz.4.2608:15519 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.4.2608      state:D stack:0     pid:15519 tgid:15519 ppid:13822  task_flags:0x400040 flags:0x00000005
Call trace: 
[<81b1de1c>] (__schedule) from [<81b1f2b0>] (__schedule_loop kernel/sched/core.c:7268 [inline])
[<81b1de1c>] (__schedule) from [<81b1f2b0>] (schedule+0x2c/0x134 kernel/sched/core.c:7283)
 r10:86a63a00 r9:83b92580 r8:870ef200 r7:85357a68 r6:ed2c5ea8 r5:ed2c5e50
 r4:83b92580
[<81b1f284>] (schedule) from [<80783c50>] (request_wait_answer fs/fuse/dev.c:590 [inline])
[<81b1f284>] (schedule) from [<80783c50>] (__fuse_request_send fs/fuse/dev.c:604 [inline])
[<81b1f284>] (schedule) from [<80783c50>] (__fuse_simple_request+0x3b8/0x520 fs/fuse/dev.c:699)
 r5:ed2c5e50 r4:85357a10
[<80783898>] (__fuse_simple_request) from [<8078d258>] (fuse_simple_request fs/fuse/fuse_i.h:1262 [inline])
[<80783898>] (__fuse_simple_request) from [<8078d258>] (fuse_flush+0x178/0x1b4 fs/fuse/file.c:500)
 r8:87524480 r7:86a996c0 r6:875a9800 r5:858b2240 r4:86a63a00
[<8078d0e0>] (fuse_flush) from [<80580cf8>] (filp_flush+0x38/0x88 fs/open.c:1467)
 r8:875a9840 r7:86705680 r6:0000001e r5:875a9800 r4:86a63a00
[<80580cc0>] (filp_flush) from [<80580d5c>] (filp_close+0x14/0x28 fs/open.c:1480)
 r7:86705680 r6:0000001e r5:86a63a00 r4:875a9800
[<80580d48>] (filp_close) from [<805b3068>] (__range_close fs/file.c:794 [inline])
[<80580d48>] (filp_close) from [<805b3068>] (__do_sys_close_range fs/file.c:855 [inline])
[<80580d48>] (filp_close) from [<805b3068>] (sys_close_range+0x18c/0x224 fs/file.c:819)
 r5:00000004 r4:875a9800
[<805b2edc>] (sys_close_range) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xed2c5fa8 to 0xed2c5ff0)
5fa0:                   00000000 00000000 00000003 0000001e 00000000 7ef48918
5fc0: 00000000 00000000 00000000 000001b4 7ef48918 00000000 00000000 003462e4
5fe0: 7ef48840 7ef48830 0002853c 00130810
 r10:000001b4 r9:83b92580 r8:8020029c r7:000001b4 r6:00000000 r5:00000000
 r4:00000000
NMI backtrace for cpu 0
CPU: 0 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)
 r7:60000093 r6:60000093 r5:8231e108 r4:00000000
[<80201af0>] (show_stack) from [<8021e37c>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201af0>] (show_stack) from [<8021e37c>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120)
[<8021e320>] (dump_stack_lvl) from [<8021e3a8>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r7:00000000 r6:00000013 r5:00000000 r4:00000001
[<8021e390>] (dump_stack) from [<81b076f4>] (nmi_cpu_backtrace+0x150/0x170 lib/nmi_backtrace.c:113)
[<81b075a4>] (nmi_cpu_backtrace) from [<81b07844>] (nmi_trigger_cpumask_backtrace+0x130/0x1d8 lib/nmi_backtrace.c:62)
 r7:00000000 r6:82a0b550 r5:82a1a2b8 r4:ffffffff
[<81b07714>] (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 r5:00007eeb r4:00000048
[<8022f0ec>] (arch_trigger_cpumask_backtrace) from [<81b0f390>] (trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline])
[<8022f0ec>] (arch_trigger_cpumask_backtrace) from [<81b0f390>] (__sys_info lib/sys_info.c:157 [inline])
[<8022f0ec>] (arch_trigger_cpumask_backtrace) from [<81b0f390>] (sys_info+0x68/0xa8 lib/sys_info.c:165)
[<81b0f328>] (sys_info) from [<8038acf0>] (check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline])
[<81b0f328>] (sys_info) from [<8038acf0>] (watchdog+0x3ac/0x858 kernel/hung_task.c:561)
 r5:00007eeb r4:00000001
[<8038a944>] (watchdog) from [<80281590>] (kthread+0x11c/0x154 kernel/kthread.c:436)
 r10:00000000 r9:df819e58 r8:83358080 r7:00000000 r6:8038a944 r5:83811900
 r4:838b0d00
[<80281474>] (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 r5:80281474 r4:838b0d00
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 2823 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 : [<81b286b0>]    lr : [<80ae22ac>]    psr: 60000113
sp : eb305ec8  ip : eb305ed8  fp : eb305ed4
r10: 82b58bf4  r9 : 00000001  r8 : 00000000
r7 : 00000117  r6 : 82b58b58  r5 : 00000000  r4 : 00000001
r3 : 000026ee  r2 : 00000000  r1 : 60000113  r0 : 839df040
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 87584c80  DAC: 00000000
Call trace: 
[<81b28688>] (_raw_spin_unlock_irqrestore) from [<80ae22ac>] (spin_unlock_irqrestore include/linux/spinlock.h:408 [inline])
[<81b28688>] (_raw_spin_unlock_irqrestore) from [<80ae22ac>] (__uart_port_unlock_irqrestore include/linux/serial_core.h:616 [inline])
[<81b28688>] (_raw_spin_unlock_irqrestore) from [<80ae22ac>] (pl011_console_device_unlock+0x20/0x24 drivers/tty/serial/amba-pl011.c:2668)
[<80ae228c>] (pl011_console_device_unlock) from [<802e8b28>] (nbcon_emit_one+0x88/0x100 kernel/printk/nbcon.c:1165)
[<802e8aa0>] (nbcon_emit_one) from [<802e8da8>] (nbcon_kthread_func+0x208/0x2ec kernel/printk/nbcon.c:1271)
 r6:82cbf2d4 r5:82b58b58 r4:833ef080
[<802e8ba0>] (nbcon_kthread_func) from [<80281590>] (kthread+0x11c/0x154 kernel/kthread.c:436)
 r10:00000000 r9:df849b38 r8:84b80b80 r7:82b58b58 r6:802e8ba0 r5:833ef080
 r4:83901c40
[<80281474>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xeb305fb0 to 0xeb305ff8)
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 r5:80281474 r4:83901c40