INFO: task syz.4.53661:20211 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.4.53661     state:D stack:0     pid:20211 tgid:20211 ppid:24908  task_flags:0x400040 flags:0x00000005
Call trace: 
[<81b576fc>] (__schedule) from [<81b58b94>] (__schedule_loop kernel/sched/core.c:7311 [inline])
[<81b576fc>] (__schedule) from [<81b58b94>] (schedule+0x2c/0xec kernel/sched/core.c:7326)
 r10:866e8200 r9:84b56e40 r8:8642ae00 r7:84e0b988 r6:eadf5ea0 r5:eadf5e30
 r4:84b56e40
[<81b58b68>] (schedule) from [<8079e6d4>] (request_wait_answer fs/fuse/dev.c:743 [inline])
[<81b58b68>] (schedule) from [<8079e6d4>] (__fuse_request_send fs/fuse/dev.c:757 [inline])
[<81b58b68>] (schedule) from [<8079e6d4>] (fuse_chan_send+0x390/0x47c fs/fuse/dev.c:833)
 r5:eadf5e30 r4:84e0b930
[<8079e344>] (fuse_chan_send) from [<807b0c3c>] (__fuse_simple_request+0x5c/0x68 fs/fuse/req.c:69)
 r8:8644e280 r7:86c78580 r6:85e17e00 r5:86d8e000 r4:eadf5ea0
[<807b0be0>] (__fuse_simple_request) from [<807a63d8>] (fuse_simple_request fs/fuse/fuse_i.h:1012 [inline])
[<807b0be0>] (__fuse_simple_request) from [<807a63d8>] (fuse_flush+0x178/0x1b4 fs/fuse/file.c:504)
 r5:850e1440 r4:866e8200
[<807a6260>] (fuse_flush) from [<805991d4>] (filp_flush+0x38/0x88 fs/open.c:1471)
 r8:85e17e40 r7:86ec9bc0 r6:0000001e r5:85e17e00 r4:866e8200
[<8059919c>] (filp_flush) from [<80599238>] (filp_close+0x14/0x28 fs/open.c:1484)
 r7:86ec9bc0 r6:0000001e r5:866e8200 r4:85e17e00
[<80599224>] (filp_close) from [<805cb75c>] (__range_close fs/file.c:793 [inline])
[<80599224>] (filp_close) from [<805cb75c>] (__do_sys_close_range fs/file.c:854 [inline])
[<80599224>] (filp_close) from [<805cb75c>] (sys_close_range+0x18c/0x224 fs/file.c:818)
 r5:00000004 r4:85e17e00
[<805cb5d0>] (sys_close_range) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xeadf5fa8 to 0xeadf5ff0)
5fa0:                   00000000 00000000 00000003 0000001e 00000000 7ed5c918
5fc0: 00000000 00000000 00000000 000001b4 009a632e ffffffff 00000000 003462e4
5fe0: 7ed5c840 7ed5c830 0002853c 00130820
 r10:000001b4 r9:84b56e40 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: 
[<80201998>] (dump_backtrace) from [<80201a8c>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:60000193 r6:60000193 r5:82332258 r4:00000000
[<80201a74>] (show_stack) from [<8021e5e0>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201a74>] (show_stack) from [<8021e5e0>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120)
[<8021e584>] (dump_stack_lvl) from [<8021e60c>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r7:00000000 r6:00000113 r5:00000001 r4:00000001
[<8021e5f4>] (dump_stack) from [<81b40d9c>] (nmi_cpu_backtrace+0x150/0x170 lib/nmi_backtrace.c:122)
[<81b40c4c>] (nmi_cpu_backtrace) from [<81b40ef0>] (nmi_trigger_cpumask_backtrace+0x134/0x208 lib/nmi_backtrace.c:65)
 r7:82a0b150 r6:83320c40 r5:82a1c7b8 r4:ffffffff
[<81b40dbc>] (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 r5:00007f07 r4:00000048
[<8022f0dc>] (arch_trigger_cpumask_backtrace) from [<81b48a2c>] (trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline])
[<8022f0dc>] (arch_trigger_cpumask_backtrace) from [<81b48a2c>] (__sys_info lib/sys_info.c:157 [inline])
[<8022f0dc>] (arch_trigger_cpumask_backtrace) from [<81b48a2c>] (sys_info+0x68/0xa8 lib/sys_info.c:165)
[<81b489c4>] (sys_info) from [<8038f87c>] (check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline])
[<81b489c4>] (sys_info) from [<8038f87c>] (watchdog+0x3a0/0x848 kernel/hung_task.c:561)
 r5:00007f07 r4:0000000a
[<8038f4dc>] (watchdog) from [<80281708>] (kthread+0x11c/0x154 kernel/kthread.c:436)
 r10:00000000 r9:df819e60 r8:831d5c00 r7:00000000 r6:8038f4dc r5:83320c40
 r4:833e0ac0
[<802815ec>] (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 r5:802815ec r4:833e0ac0
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 3098 Comm: sshd-session Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: ARM-Versatile Express
PC is at 0x7694c4ec
LR is at 0x4baa10
pc : [<7694c4ec>]    lr : [<004baa10>]    psr: 20030010
sp : 7ed020b8  ip : 00000000  fp : 004bd9e4
r10: 00000004  r9 : 01be2750  r8 : 7ed020dc
r7 : 7ed020e0  r6 : 7ed06120  r5 : 01be01d8  r4 : 01be2218
r3 : 7ed0581c  r2 : 000008c0  r1 : 00000000  r0 : 7ed020dc
Flags: nzCv  IRQs on  FIQs on  Mode USER_32  ISA ARM  Segment user
Control: 30c5387d  Table: 85b40300  DAC: fffffffd
Call trace: invalid frame pointer 0x004bd9e4