INFO: task syz.3.2678:16432 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.3.2678      state:D stack:0     pid:16432 tgid:16432 ppid:15963  task_flags:0x400040 flags:0x00000005
Call trace: 
[<81aea14c>] (__schedule) from [<81aeb560>] (__schedule_loop kernel/sched/core.c:6993 [inline])
[<81aea14c>] (__schedule) from [<81aeb560>] (schedule+0x2c/0x134 kernel/sched/core.c:7008)
 r10:8ba3b600 r9:8474a4c0 r8:852c7c00 r7:84c1f6e8 r6:df9d5ea8 r5:df9d5e50
 r4:8474a4c0
[<81aeb534>] (schedule) from [<807692c0>] (request_wait_answer fs/fuse/dev.c:585 [inline])
[<81aeb534>] (schedule) from [<807692c0>] (__fuse_request_send fs/fuse/dev.c:599 [inline])
[<81aeb534>] (schedule) from [<807692c0>] (__fuse_simple_request+0x398/0x4f4 fs/fuse/dev.c:693)
 r5:df9d5e50 r4:84c1f690
[<80768f28>] (__fuse_simple_request) from [<807749a0>] (fuse_simple_request fs/fuse/fuse_i.h:1263 [inline])
[<80768f28>] (__fuse_simple_request) from [<807749a0>] (fuse_flush+0x178/0x1b4 fs/fuse/file.c:494)
 r8:85dae880 r7:861ee000 r6:858ac600 r5:85452000 r4:8ba3b600
[<80774828>] (fuse_flush) from [<8057008c>] (filp_flush+0x38/0x88 fs/open.c:1469)
 r8:858ac640 r7:8b992580 r6:0000001e r5:858ac600 r4:8ba3b600
[<80570054>] (filp_flush) from [<805700f0>] (filp_close+0x14/0x28 fs/open.c:1482)
 r7:8b992580 r6:0000001e r5:8ba3b600 r4:858ac600
[<805700dc>] (filp_close) from [<805a1970>] (__range_close fs/file.c:794 [inline])
[<805700dc>] (filp_close) from [<805a1970>] (__do_sys_close_range fs/file.c:855 [inline])
[<805700dc>] (filp_close) from [<805a1970>] (sys_close_range+0x18c/0x224 fs/file.c:819)
 r5:00000005 r4:858ac600
[<805a17e4>] (sys_close_range) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdf9d5fa8 to 0xdf9d5ff0)
5fa0:                   00000000 00000000 00000003 0000001e 00000000 7ef79918
5fc0: 00000000 00000000 00000000 000001b4 0022df75 ffffffff 00000000 003462e4
5fe0: 7ef79840 7ef79830 00028034 00130300
 r10:000001b4 r9:8474a4c0 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)
 r7:60000193 r6:60000193 r5:822a8688 r4:00000000
[<80201af0>] (show_stack) from [<8021e410>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201af0>] (show_stack) from [<8021e410>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120)
[<8021e3b4>] (dump_stack_lvl) from [<8021e43c>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r7:00000000 r6:00000113 r5:00000001 r4:00000001
[<8021e424>] (dump_stack) from [<81ad3b7c>] (nmi_cpu_backtrace+0x150/0x170 lib/nmi_backtrace.c:113)
[<81ad3a2c>] (nmi_cpu_backtrace) from [<81ad3ccc>] (nmi_trigger_cpumask_backtrace+0x130/0x1d8 lib/nmi_backtrace.c:62)
 r7:00000001 r6:8280c550 r5:8281afb8 r4:ffffffff
[<81ad3b9c>] (nmi_trigger_cpumask_backtrace) from [<8022f124>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:852)
 r9:82ac7834 r8:8280c6d8 r7:0003b850 r6:831f9a84 r5:82804d80 r4:00000048
[<8022f10c>] (arch_trigger_cpumask_backtrace) from [<81adb7bc>] (trigger_all_cpu_backtrace include/linux/nmi.h:161 [inline])
[<8022f10c>] (arch_trigger_cpumask_backtrace) from [<81adb7bc>] (__sys_info lib/sys_info.c:157 [inline])
[<8022f10c>] (arch_trigger_cpumask_backtrace) from [<81adb7bc>] (sys_info+0x68/0xa8 lib/sys_info.c:165)
[<81adb754>] (sys_info) from [<80385270>] (check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline])
[<81adb754>] (sys_info) from [<80385270>] (watchdog+0x59c/0x8d8 kernel/hung_task.c:515)
 r5:82804d80 r4:8383c214
[<80384cd4>] (watchdog) from [<802814a4>] (kthread+0x11c/0x154 kernel/kthread.c:436)
 r10:00000000 r9:df819e60 r8:83103600 r7:00000000 r6:80384cd4 r5:83180000
 r4:8333db80
[<80281388>] (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 r5:80281388 r4:8333db80
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 14991 Comm: syz-executor Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: ARM-Versatile Express
PC is at 0x29734
LR is at 0x17
pc : [<00029734>]    lr : [<00000017>]    psr: 60000010
sp : 7e9faa38  ip : 00000000  fp : 7e9faad0
r10: 00000000  r9 : 00036ee8  r8 : 00003a98
r7 : 00008ca0  r6 : 00330000  r5 : 00000000  r4 : 0000000d
r3 : 00000000  r2 : 00000000  r1 : 00000000  r0 : 00000000
Flags: nZCv  IRQs on  FIQs on  Mode USER_32  ISA ARM  Segment user
Control: 30c5387d  Table: 8b4fc5c0  DAC: fffffffd
Call trace: invalid frame pointer 0x7e9faad0