INFO: task syz.6.50490:13824 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.6.50490     state:D stack:0     pid:13824 tgid:13824 ppid:3291   task_flags:0x400140 flags:0x00000005
Call trace: 
[<81b6103c>] (__schedule) from [<81b624d4>] (__schedule_loop kernel/sched/core.c:7311 [inline])
[<81b6103c>] (__schedule) from [<81b624d4>] (schedule+0x2c/0xec kernel/sched/core.c:7326)
 r10:855c4300 r9:84eb0c40 r8:85fcbd00 r7:850c1c28 r6:e03a5ea0 r5:e03a5e30
 r4:84eb0c40
[<81b624a8>] (schedule) from [<807a16cc>] (request_wait_answer fs/fuse/dev.c:743 [inline])
[<81b624a8>] (schedule) from [<807a16cc>] (__fuse_request_send fs/fuse/dev.c:757 [inline])
[<81b624a8>] (schedule) from [<807a16cc>] (fuse_chan_send+0x390/0x47c fs/fuse/dev.c:833)
 r5:e03a5e30 r4:850c1bd0
[<807a133c>] (fuse_chan_send) from [<807b3c24>] (__fuse_simple_request+0x5c/0x68 fs/fuse/req.c:69)
 r8:87e3b400 r7:857978c0 r6:86292300 r5:85d94e40 r4:e03a5ea0
[<807b3bc8>] (__fuse_simple_request) from [<807a93c0>] (fuse_simple_request fs/fuse/fuse_i.h:1012 [inline])
[<807b3bc8>] (__fuse_simple_request) from [<807a93c0>] (fuse_flush+0x178/0x1b4 fs/fuse/file.c:504)
 r5:858d5680 r4:855c4300
[<807a9248>] (fuse_flush) from [<8059ae4c>] (filp_flush+0x38/0x88 fs/open.c:1471)
 r8:86292340 r7:87f51780 r6:0000001e r5:86292300 r4:855c4300
[<8059ae14>] (filp_flush) from [<8059aeb0>] (filp_close+0x14/0x28 fs/open.c:1484)
 r7:87f51780 r6:0000001e r5:855c4300 r4:86292300
[<8059ae9c>] (filp_close) from [<805cd4d8>] (__range_close fs/file.c:793 [inline])
[<8059ae9c>] (filp_close) from [<805cd4d8>] (__do_sys_close_range fs/file.c:854 [inline])
[<8059ae9c>] (filp_close) from [<805cd4d8>] (sys_close_range+0x18c/0x224 fs/file.c:818)
 r5:00000005 r4:86292300
[<805cd34c>] (sys_close_range) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xe03a5fa8 to 0xe03a5ff0)
5fa0:                   00000000 00000000 00000003 0000001e 00000000 7ed72920
5fc0: 00000000 00000000 00000000 000001b4 0077098d ffffffff 00000000 003562e4
5fe0: 7ed72848 7ed72838 00028610 001309d0
 r10:000001b4 r9:84eb0c40 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: 
[<80201998>] (dump_backtrace) from [<80201a8c>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:60000193 r6:60000193 r5:8233336c r4:00000000
[<80201a74>] (show_stack) from [<8021ec68>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201a74>] (show_stack) from [<8021ec68>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120)
[<8021ec0c>] (dump_stack_lvl) from [<8021ec94>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r7:00000000 r6:00000113 r5:00000000 r4:00000001
[<8021ec7c>] (dump_stack) from [<81b4a6dc>] (nmi_cpu_backtrace+0x150/0x170 lib/nmi_backtrace.c:122)
[<81b4a58c>] (nmi_cpu_backtrace) from [<81b4a830>] (nmi_trigger_cpumask_backtrace+0x134/0x208 lib/nmi_backtrace.c:65)
 r7:82a0b150 r6:83320c40 r5:82a1c7b8 r4:ffffffff
[<81b4a6fc>] (nmi_trigger_cpumask_backtrace) from [<802300f4>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:851)
 r9:82a0b2f0 r8:00000001 r7:82a1ce80 r6:82ccae2c r5:00007ee3 r4:00000048
[<802300dc>] (arch_trigger_cpumask_backtrace) from [<81b5236c>] (trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline])
[<802300dc>] (arch_trigger_cpumask_backtrace) from [<81b5236c>] (__sys_info lib/sys_info.c:157 [inline])
[<802300dc>] (arch_trigger_cpumask_backtrace) from [<81b5236c>] (sys_info+0x68/0xa8 lib/sys_info.c:165)
[<81b52304>] (sys_info) from [<803909a8>] (check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline])
[<81b52304>] (sys_info) from [<803909a8>] (watchdog+0x3a0/0x848 kernel/hung_task.c:561)
 r5:00007ee3 r4:0000000a
[<80390608>] (watchdog) from [<80282710>] (kthread+0x11c/0x154 kernel/kthread.c:436)
 r10:00000000 r9:df819e60 r8:831d4600 r7:00000000 r6:80390608 r5:83320c40
 r4:833dd400
[<802825f4>] (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 r5:802825f4 r4:833dd400
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 13414 Comm: kworker/u8:3 Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: ARM-Versatile Express
Workqueue: events_unbound nsim_dev_trap_report_work
PC is at prefetchw arch/arm/include/asm/processor.h:122 [inline]
PC is at arch_spin_lock arch/arm/include/asm/spinlock.h:62 [inline]
PC is at do_raw_spin_lock include/linux/spinlock.h:187 [inline]
PC is at __raw_spin_lock include/linux/spinlock_api_smp.h:159 [inline]
PC is at _raw_spin_lock+0x18/0x58 kernel/locking/spinlock.c:158
LR is at get_lock_parent_ip include/linux/ftrace.h:1180 [inline]
LR is at preempt_latency_start kernel/sched/core.c:5963 [inline]
LR is at preempt_count_add+0x12c/0x150 kernel/sched/core.c:5988
pc : [<81b6ba80>]    lr : [<80290bbc>]    psr: 60030113
sp : ea879e78  ip : ea879e50  fp : ea879e8c
r10: 81da4dd8  r9 : 85fab400  r8 : 00000000
r7 : 85fab444  r6 : 00000000  r5 : 84fa2d20  r4 : 85fab444
r3 : 81b6b544  r2 : 00000000  r1 : 00000000  r0 : 00000000
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 855b83c0  DAC: 00000000
Call trace: 
[<81b6ba68>] (_raw_spin_lock) from [<80efa2e4>] (spin_lock include/linux/spinlock.h:342 [inline])
[<81b6ba68>] (_raw_spin_lock) from [<80efa2e4>] (nsim_dev_trap_report drivers/net/netdevsim/dev.c:862 [inline])
[<81b6ba68>] (_raw_spin_lock) from [<80efa2e4>] (nsim_dev_trap_report_work+0xb0/0x438 drivers/net/netdevsim/dev.c:922)
 r5:84fa2d20 r4:84fa2d98
[<80efa234>] (nsim_dev_trap_report_work) from [<802771e8>] (process_one_work+0x1c8/0x580 kernel/workqueue.c:3322)
 r10:83029a05 r9:83e5ee40 r8:02000000 r7:83012a00 r6:83029a00 r5:85fab400
 r4:865ff400
[<80277020>] (process_one_work) from [<80277e94>] (process_scheduled_works kernel/workqueue.c:3405 [inline])
[<80277020>] (process_one_work) from [<80277e94>] (worker_thread+0x16c/0x318 kernel/workqueue.c:3486)
 r10:00000000 r9:865ff430 r8:83e5ee40 r7:82a03d80 r6:83012a20 r5:83012a00
 r4:865ff400
[<80277d28>] (worker_thread) from [<80282710>] (kthread+0x11c/0x154 kernel/kthread.c:436)
 r10:00000000 r9:ed0c9e88 r8:865ff480 r7:865ff400 r6:80277d28 r5:83e5ee40
 r4:855898c0
[<802825f4>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xea879fb0 to 0xea879ff8)
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 r5:802825f4 r4:855898c0