INFO: task syz.6.40215:26530 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.6.40215     state:D stack:0     pid:26530 tgid:26530 ppid:9014   task_flags:0x400040 flags:0x00000005
Call trace: 
[<81b184bc>] (__schedule) from [<81b1994c>] (__schedule_loop kernel/sched/core.c:7268 [inline])
[<81b184bc>] (__schedule) from [<81b1994c>] (schedule+0x2c/0x134 kernel/sched/core.c:7283)
 r10:8647bc80 r9:84ff1880 r8:85f2fc00 r7:8551fec8 r6:ea6f5ea8 r5:ea6f5e50
 r4:84ff1880
[<81b19920>] (schedule) from [<80782518>] (request_wait_answer fs/fuse/dev.c:590 [inline])
[<81b19920>] (schedule) from [<80782518>] (__fuse_request_send fs/fuse/dev.c:604 [inline])
[<81b19920>] (schedule) from [<80782518>] (__fuse_simple_request+0x3b8/0x520 fs/fuse/dev.c:699)
 r5:ea6f5e50 r4:8551fe70
[<80782160>] (__fuse_simple_request) from [<8078ba78>] (fuse_simple_request fs/fuse/fuse_i.h:1262 [inline])
[<80782160>] (__fuse_simple_request) from [<8078ba78>] (fuse_flush+0x178/0x1b4 fs/fuse/file.c:500)
 r8:863fb800 r7:8be3da00 r6:86502800 r5:8509ad80 r4:8647bc80
[<8078b900>] (fuse_flush) from [<805800a4>] (filp_flush+0x38/0x88 fs/open.c:1467)
 r8:86502840 r7:8af7a2c0 r6:0000001e r5:86502800 r4:8647bc80
[<8058006c>] (filp_flush) from [<80580108>] (filp_close+0x14/0x28 fs/open.c:1480)
 r7:8af7a2c0 r6:0000001e r5:8647bc80 r4:86502800
[<805800f4>] (filp_close) from [<805b23ec>] (__range_close fs/file.c:794 [inline])
[<805800f4>] (filp_close) from [<805b23ec>] (__do_sys_close_range fs/file.c:855 [inline])
[<805800f4>] (filp_close) from [<805b23ec>] (sys_close_range+0x18c/0x224 fs/file.c:819)
 r5:00000005 r4:86502800
[<805b2260>] (sys_close_range) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xea6f5fa8 to 0xea6f5ff0)
5fa0:                   00000000 00000000 00000003 0000001e 00000000 7ec4e918
5fc0: 00000000 00000000 00000000 000001b4 009d9853 ffffffff 00000000 003462e4
5fe0: 7ec4e840 7ec4e830 000284d4 001307a0
 r10:000001b4 r9:84ff1880 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)
 r7:60000093 r6:60000093 r5:8231e0a0 r4:00000000
[<80201af0>] (show_stack) from [<8021e34c>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201af0>] (show_stack) from [<8021e34c>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120)
[<8021e2f0>] (dump_stack_lvl) from [<8021e378>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r7:00000000 r6:00000013 r5:00000001 r4:00000001
[<8021e360>] (dump_stack) from [<81b01d94>] (nmi_cpu_backtrace+0x150/0x170 lib/nmi_backtrace.c:113)
[<81b01c44>] (nmi_cpu_backtrace) from [<81b01ee4>] (nmi_trigger_cpumask_backtrace+0x130/0x1d8 lib/nmi_backtrace.c:62)
 r7:00000001 r6:82a0b550 r5:82a1a2b8 r4:ffffffff
[<81b01db4>] (nmi_trigger_cpumask_backtrace) from [<8022f104>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:852)
 r9:82a0b6d8 r8:00000001 r7:00000048 r6:82cc3de4 r5:00007f12 r4:00000048
[<8022f0ec>] (arch_trigger_cpumask_backtrace) from [<81b09a30>] (trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline])
[<8022f0ec>] (arch_trigger_cpumask_backtrace) from [<81b09a30>] (__sys_info lib/sys_info.c:157 [inline])
[<8022f0ec>] (arch_trigger_cpumask_backtrace) from [<81b09a30>] (sys_info+0x68/0xa8 lib/sys_info.c:165)
[<81b099c8>] (sys_info) from [<8038a87c>] (check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline])
[<81b099c8>] (sys_info) from [<8038a87c>] (watchdog+0x3a0/0x84c kernel/hung_task.c:561)
 r5:00007f12 r4:0000000a
[<8038a4dc>] (watchdog) from [<80281418>] (kthread+0x11c/0x154 kernel/kthread.c:436)
 r10:00000000 r9:df819e58 r8:83114380 r7:00000000 r6:8038a4dc r5:83178000
 r4:831eab80
[<802812fc>] (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 r5:802812fc r4:831eab80
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 24533 Comm: syz.2.39297 Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: ARM-Versatile Express
PC is at 0x193b4
LR is at 0x193b4
pc : [<000193b4>]    lr : [<000193b4>]    psr: 20000010
sp : 20000110  ip : 20000110  fp : 76f080dc
r10: 00000001  r9 : 00000000  r8 : 003462d8
r7 : 00000000  r6 : 00000000  r5 : 00000000  r4 : 00000000
r3 : 00000000  r2 : 000001fc  r1 : 00000004  r0 : ffffffff
Flags: nzCv  IRQs on  FIQs on  Mode USER_32  ISA ARM  Segment user
Control: 30c5387d  Table: 867dd6c0  DAC: fffffffd
Call trace: invalid frame pointer 0x76f080dc