INFO: task syz.7.47966:12890 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.7.47966     state:D stack:0     pid:12890 tgid:12890 ppid:7315   task_flags:0x400140 flags:0x00000005
Call trace: 
[<81b5f61c>] (__schedule) from [<81b60ab4>] (__schedule_loop kernel/sched/core.c:7311 [inline])
[<81b5f61c>] (__schedule) from [<81b60ab4>] (schedule+0x2c/0xec kernel/sched/core.c:7326)
 r10:862fd100 r9:8532b100 r8:86479200 r7:84ea80c8 r6:eacb1ea0 r5:eacb1e30
 r4:8532b100
[<81b60a88>] (schedule) from [<807a0348>] (request_wait_answer fs/fuse/dev.c:743 [inline])
[<81b60a88>] (schedule) from [<807a0348>] (__fuse_request_send fs/fuse/dev.c:757 [inline])
[<81b60a88>] (schedule) from [<807a0348>] (fuse_chan_send+0x390/0x47c fs/fuse/dev.c:833)
 r5:eacb1e30 r4:84ea8070
[<8079ffb8>] (fuse_chan_send) from [<807b28a0>] (__fuse_simple_request+0x5c/0x68 fs/fuse/req.c:69)
 r8:830c7400 r7:85704080 r6:83e1f200 r5:8492fe40 r4:eacb1ea0
[<807b2844>] (__fuse_simple_request) from [<807a803c>] (fuse_simple_request fs/fuse/fuse_i.h:1012 [inline])
[<807b2844>] (__fuse_simple_request) from [<807a803c>] (fuse_flush+0x178/0x1b4 fs/fuse/file.c:504)
 r5:8596b200 r4:862fd100
[<807a7ec4>] (fuse_flush) from [<80599b24>] (filp_flush+0x38/0x88 fs/open.c:1471)
 r8:83e1f240 r7:8bd4c540 r6:0000001e r5:83e1f200 r4:862fd100
[<80599aec>] (filp_flush) from [<80599b88>] (filp_close+0x14/0x28 fs/open.c:1484)
 r7:8bd4c540 r6:0000001e r5:862fd100 r4:83e1f200
[<80599b74>] (filp_close) from [<805cc1b0>] (__range_close fs/file.c:793 [inline])
[<80599b74>] (filp_close) from [<805cc1b0>] (__do_sys_close_range fs/file.c:854 [inline])
[<80599b74>] (filp_close) from [<805cc1b0>] (sys_close_range+0x18c/0x224 fs/file.c:818)
 r5:00000004 r4:83e1f200
[<805cc024>] (sys_close_range) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xeacb1fa8 to 0xeacb1ff0)
1fa0:                   00000000 00000000 00000003 0000001e 00000000 7eae3920
1fc0: 00000000 00000000 00000000 000001b4 7eae3920 00000000 00000000 003562e4
1fe0: 7eae3848 7eae3838 00028610 001309d0
 r10:000001b4 r9:8532b100 r8:8020029c r7:000001b4 r6:00000000 r5:00000000
 r4:00000000
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID:
CPU: 0 UID: 0 PID: 29 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: ARM-Versatile Express
Call trace: 
[<80201998>] (dump_backtrace) from [<80201a8c>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:60000093 r6:60000093 r5:823330fc r4:00000000
[<80201a74>] (show_stack) from [<8021e5fc>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201a74>] (show_stack) from [<8021e5fc>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120)
[<8021e5a0>] (dump_stack_lvl) from [<8021e628>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r7:00000000 r6:00000013 r5:00000000 r4:00000001
[<8021e610>] (dump_stack) from [<81b48cbc>] (nmi_cpu_backtrace+0x150/0x170 lib/nmi_backtrace.c:122)
[<81b48b6c>] (nmi_cpu_backtrace) from [<81b48e10>] (nmi_trigger_cpumask_backtrace+0x134/0x208 lib/nmi_backtrace.c:65)
 r7:82a0b150 r6:83320c40 r5:82a1c7b8 r4:ffffffff
[<81b48cdc>] (nmi_trigger_cpumask_backtrace) from [<8022f0f4>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:851)
 r9:82a0b2f0 r8:00000001 r7:82a1ce80 r6:82ccae2c r5:00007ef6 r4:00000048
[<8022f0dc>] (arch_trigger_cpumask_backtrace) from [<81b5094c>] (trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline])
[<8022f0dc>] (arch_trigger_cpumask_backtrace) from [<81b5094c>] (__sys_info lib/sys_info.c:157 [inline])
[<8022f0dc>] (arch_trigger_cpumask_backtrace) from [<81b5094c>] (sys_info+0x68/0xa8 lib/sys_info.c:165)
[<81b508e4>] (sys_info) from [<8038f988>] (check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline])
[<81b508e4>] (sys_info) from [<8038f988>] (watchdog+0x3a0/0x848 kernel/hung_task.c:561)
 r5:00007ef6 r4:0000000a
[<8038f5e8>] (watchdog) from [<80281710>] (kthread+0x11c/0x154 kernel/kthread.c:436)
 r10:00000000 r9:df819e60 r8:831d4600 r7:00000000 r6:8038f5e8 r5:83320c40
 r4:833dd400
[<802815f4>] (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 r5:802815f4 r4:833dd400
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 2832 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:618 [inline]
LR is at pl011_console_device_unlock+0x20/0x24 drivers/tty/serial/amba-pl011.c:2700
pc : [<81b69f7c>]    lr : [<80b02760>]    psr: 60000013
sp : eada9ec8  ip : eada9ed8  fp : eada9ed4
r10: 82b5cd1c  r9 : 00000001  r8 : 00000000
r7 : 00000117  r6 : 82b5cc80  r5 : 00000000  r4 : 00000001
r3 : 0000152f  r2 : 00000000  r1 : 60000013  r0 : 842b8440
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 8be27b00  DAC: 00000000
Call trace: 
[<81b69f54>] (_raw_spin_unlock_irqrestore) from [<80b02760>] (spin_unlock_irqrestore include/linux/spinlock.h:408 [inline])
[<81b69f54>] (_raw_spin_unlock_irqrestore) from [<80b02760>] (__uart_port_unlock_irqrestore include/linux/serial_core.h:618 [inline])
[<81b69f54>] (_raw_spin_unlock_irqrestore) from [<80b02760>] (pl011_console_device_unlock+0x20/0x24 drivers/tty/serial/amba-pl011.c:2700)
[<80b02740>] (pl011_console_device_unlock) from [<802ec210>] (nbcon_emit_one+0x88/0x100 kernel/printk/nbcon.c:1165)
[<802ec188>] (nbcon_emit_one) from [<802ec490>] (nbcon_kthread_func+0x208/0x2ec kernel/printk/nbcon.c:1271)
 r6:82cc72ec r5:82b5cc80 r4:85378c40
[<802ec288>] (nbcon_kthread_func) from [<80281710>] (kthread+0x11c/0x154 kernel/kthread.c:436)
 r10:00000000 r9:eb0b1b38 r8:84e77e00 r7:82b5cc80 r6:802ec288 r5:85378c40
 r4:84e73000
[<802815f4>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xeada9fb0 to 0xeada9ff8)
9fa0:                                     00000000 00000000 00000000 00000000
9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:802815f4 r4:84e73000