INFO: task syz-executor.0:3567 blocked for more than 430 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:0     pid:3567  tgid:3567  ppid:1      task_flags:0x400140 flags:0x00000005
Call trace: 
[<81a6463c>] (__schedule) from [<81a655d0>] (__schedule_loop kernel/sched/core.c:7011 [inline])
[<81a6463c>] (__schedule) from [<81a655d0>] (schedule+0x2c/0x130 kernel/sched/core.c:7026)
 r10:df985bfc r9:00000002 r8:60000013 r7:83794228 r6:df985c04 r5:84b66c00
 r4:84b66c00
[<81a655a4>] (schedule) from [<81a659b8>] (schedule_preempt_disabled+0x18/0x24 kernel/sched/core.c:7083)
 r5:84b66c00 r4:83794224
[<81a659a0>] (schedule_preempt_disabled) from [<81a68568>] (__mutex_lock_common kernel/locking/mutex.c:676 [inline])
[<81a659a0>] (schedule_preempt_disabled) from [<81a68568>] (__mutex_lock.constprop.0+0x350/0xa24 kernel/locking/mutex.c:760)
[<81a68218>] (__mutex_lock.constprop.0) from [<81a68d10>] (__mutex_lock_slowpath+0x14/0x18 kernel/locking/mutex.c:1049)
 r10:83226014 r9:80808080 r8:00000001 r7:00000000 r6:85421110 r5:83794000
 r4:85421110
[<81a68cfc>] (__mutex_lock_slowpath) from [<81a68d50>] (mutex_lock+0x3c/0x40 kernel/locking/mutex.c:274)
[<81a68d14>] (mutex_lock) from [<807524f8>] (fuse_lock_inode+0x34/0x3c fs/fuse/inode.c:604)
[<807524c4>] (fuse_lock_inode) from [<80746f0c>] (fuse_lookup+0x64/0x174 fs/fuse/dir.c:427)
[<80746ea8>] (fuse_lookup) from [<8056ee9c>] (__lookup_slow+0x8c/0x140 fs/namei.c:1816)
 r9:80808080 r8:df985e60 r7:83794000 r6:00000403 r5:85412aa0 r4:85421110
[<8056ee10>] (__lookup_slow) from [<80572f20>] (lookup_slow fs/namei.c:1833 [inline])
[<8056ee10>] (__lookup_slow) from [<80572f20>] (walk_component+0x104/0x170 fs/namei.c:2151)
 r9:80808080 r8:00000403 r7:00000002 r6:df985e58 r5:83794080 r4:85412aa0
[<80572e1c>] (walk_component) from [<805731ac>] (link_path_walk+0x220/0x3dc fs/namei.c:2519)
 r9:80808080 r8:2f2f2f2f r7:d0d0d0d0 r6:df985e58 r5:fefefeff r4:83226015
[<80572f8c>] (link_path_walk) from [<8057488c>] (path_openat+0x7c/0x1150 fs/namei.c:4130)
 r10:84986cc0 r9:83226000 r8:df985e58 r7:df985e58 r6:df985f20 r5:83226010
 r4:ffffff9c
[<80574810>] (path_openat) from [<80575a0c>] (do_filp_open+0xac/0x148 fs/namei.c:4161)
 r10:00000142 r9:83226000 r8:00000003 r7:df985e58 r6:df985f20 r5:84b66c00
 r4:ffffff9c
[<80575960>] (do_filp_open) from [<8055c5b4>] (do_sys_openat2+0x90/0xe0 fs/open.c:1437)
 r9:84b66c00 r8:8020029c r7:ffffff9c r6:df985f58 r5:83226000 r4:00000003
[<8055c524>] (do_sys_openat2) from [<8055c9dc>] (do_sys_open fs/open.c:1452 [inline])
[<8055c524>] (do_sys_openat2) from [<8055c9dc>] (__do_sys_openat fs/open.c:1468 [inline])
[<8055c524>] (do_sys_openat2) from [<8055c9dc>] (sys_openat+0x98/0xd4 fs/open.c:1463)
 r7:00000142 r6:00000000 r5:00093608 r4:ffffff9c
[<8055c944>] (sys_openat) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdf985fa8 to 0xdf985ff0)
5fa0:                   00000002 7ebae61c ffffff9c 00093608 000a4800 00000000
5fc0: 00000002 7ebae61c 00000000 00000142 00140000 00000000 7ebae670 7ebae630
5fe0: 0011c000 7ebae580 0004b8d4 000502b8
 r5:7ebae61c r4:00000002
INFO: task syz-executor.0:3567 is blocked on a mutex likely owned by task syz-executor.0:3972.
INFO: task syz-executor.0:3972 blocked for more than 430 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:0     pid:3972  tgid:3965  ppid:3567   task_flags:0x400140 flags:0x00000005
Call trace: 
[<81a6463c>] (__schedule) from [<81a655d0>] (__schedule_loop kernel/sched/core.c:7011 [inline])
[<81a6463c>] (__schedule) from [<81a655d0>] (schedule+0x2c/0x130 kernel/sched/core.c:7026)
 r10:00000000 r9:dfa21c8c r8:84a730c8 r7:84a730c8 r6:dfa21bf0 r5:dfa21b58
 r4:83baa400
[<81a655a4>] (schedule) from [<8074157c>] (request_wait_answer fs/fuse/dev.c:585 [inline])
[<81a655a4>] (schedule) from [<8074157c>] (__fuse_request_send fs/fuse/dev.c:599 [inline])
[<81a655a4>] (schedule) from [<8074157c>] (__fuse_simple_request+0x384/0x4dc fs/fuse/dev.c:693)
 r5:dfa21b58 r4:84a73070
[<807411f8>] (__fuse_simple_request) from [<80746ce8>] (fuse_simple_request fs/fuse/fuse_i.h:1250 [inline])
[<807411f8>] (__fuse_simple_request) from [<80746ce8>] (fuse_lookup_name+0xc0/0x280 fs/fuse/dir.c:381)
 r8:849a3e80 r7:84c8f800 r6:85414568 r5:00000001 r4:dfa21c90
[<80746c28>] (fuse_lookup_name) from [<80746f38>] (fuse_lookup+0x90/0x174 fs/fuse/dir.c:428)
 r10:8334c014 r9:00000001 r8:00000001 r7:00000000 r6:85414550 r5:83794000
 r4:85414550
[<80746ea8>] (fuse_lookup) from [<8056ee9c>] (__lookup_slow+0x8c/0x140 fs/namei.c:1816)
 r9:80808080 r8:dfa21e60 r7:83794000 r6:00000401 r5:85412aa0 r4:85414550
[<8056ee10>] (__lookup_slow) from [<80572f20>] (lookup_slow fs/namei.c:1833 [inline])
[<8056ee10>] (__lookup_slow) from [<80572f20>] (walk_component+0x104/0x170 fs/namei.c:2151)
 r9:80808080 r8:00000401 r7:00000002 r6:dfa21e58 r5:83794080 r4:85412aa0
[<80572e1c>] (walk_component) from [<805731ac>] (link_path_walk+0x220/0x3dc fs/namei.c:2519)
 r9:80808080 r8:2f2f2f2f r7:d0d0d0d0 r6:dfa21e58 r5:fefefeff r4:8334c015
[<80572f8c>] (link_path_walk) from [<8057488c>] (path_openat+0x7c/0x1150 fs/namei.c:4130)
 r10:84cb7840 r9:8334c000 r8:dfa21e58 r7:dfa21e58 r6:dfa21f20 r5:8334c010
 r4:ffffff9c
[<80574810>] (path_openat) from [<80575a0c>] (do_filp_open+0xac/0x148 fs/namei.c:4161)
 r10:00000142 r9:8334c000 r8:00000001 r7:dfa21e58 r6:dfa21f20 r5:83baa400
 r4:ffffff9c
[<80575960>] (do_filp_open) from [<8055c5b4>] (do_sys_openat2+0x90/0xe0 fs/open.c:1437)
 r9:83baa400 r8:8020029c r7:ffffff9c r6:dfa21f58 r5:8334c000 r4:00000005
[<8055c524>] (do_sys_openat2) from [<8055c9dc>] (do_sys_open fs/open.c:1452 [inline])
[<8055c524>] (do_sys_openat2) from [<8055c9dc>] (__do_sys_openat fs/open.c:1468 [inline])
[<8055c524>] (do_sys_openat2) from [<8055c9dc>] (sys_openat+0x98/0xd4 fs/open.c:1463)
 r7:00000142 r6:00000000 r5:76b23da0 r4:ffffff9c
[<8055c944>] (sys_openat) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfa21fa8 to 0xdfa21ff0)
1fa0:                   00000002 76b23da0 ffffff9c 76b23da0 00000002 00000000
1fc0: 00000002 76b23da0 00000000 00000142 00000000 6e704000 20000240 20000a40
1fe0: 0000005c 76b23d10 00091144 0004ee98
 r5:76b23da0 r4:00000002
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT 
Hardware name: ARM-Versatile Express
Call trace: 
[<80201a24>] (dump_backtrace) from [<80201b20>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:00000000 r6:00000013 r5:60000093 r4:822527c4
[<80201b08>] (show_stack) from [<8021f8f8>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201b08>] (show_stack) from [<8021f8f8>] (dump_stack_lvl+0x70/0x7c lib/dump_stack.c:120)
[<8021f888>] (dump_stack_lvl) from [<8021f91c>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r5:00000001 r4:00000001
[<8021f904>] (dump_stack) from [<81a4e254>] (nmi_cpu_backtrace+0x160/0x17c lib/nmi_backtrace.c:113)
[<81a4e0f4>] (nmi_cpu_backtrace) from [<81a4e3a0>] (nmi_trigger_cpumask_backtrace+0x130/0x1d8 lib/nmi_backtrace.c:62)
 r7:00000001 r6:8280c690 r5:8281ae34 r4:ffffffff
[<81a4e270>] (nmi_trigger_cpumask_backtrace) from [<802304fc>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:852)
 r9:8281ba28 r8:8280c810 r7:00008e00 r6:00007f54 r5:82abf7d4 r4:83e6f50c
[<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037faf8>] (trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline])
[<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037faf8>] (check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline])
[<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037faf8>] (watchdog+0x5d0/0x850 kernel/hung_task.c:495)
[<8037f528>] (watchdog) from [<8028020c>] (kthread+0x12c/0x280 kernel/kthread.c:463)
 r10:00000000 r9:00000000 r8:8037f528 r7:830d5380 r6:830d5380 r5:8321e000
 r4:00000001
[<802800e0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xdf8d9fb0 to 0xdf8d9ff8)
9fa0:                                     00000000 00000000 00000000 00000000
9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:802800e0
 r4:833db900
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 2820 Comm: pr/ttyAMA-1 Not tainted syzkaller #0 PREEMPT 
Hardware name: ARM-Versatile Express
PC is at __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
PC is at _raw_spin_unlock_irqrestore+0x28/0x54 kernel/locking/spinlock.c:194
LR is at spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
LR is at __uart_port_unlock_irqrestore include/linux/serial_core.h:616 [inline]
LR is at pl011_console_device_unlock+0x20/0x24 drivers/tty/serial/amba-pl011.c:2603
pc : [<81a6e4a4>]    lr : [<80a8f5a8>]    psr: 60070013
sp : eac75eb0  ip : eac75ec0  fp : eac75ebc
r10: 82959594  r9 : 00000000  r8 : 00000000
r7 : 00000117  r6 : 829594f8  r5 : 00000000  r4 : 00000001
r3 : 00000547  r2 : 00000000  r1 : 60070013  r0 : 83e7c040
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 84a77140  DAC: fffffffd
Call trace: 
[<81a6e47c>] (_raw_spin_unlock_irqrestore) from [<80a8f5a8>] (spin_unlock_irqrestore include/linux/spinlock.h:406 [inline])
[<81a6e47c>] (_raw_spin_unlock_irqrestore) from [<80a8f5a8>] (__uart_port_unlock_irqrestore include/linux/serial_core.h:616 [inline])
[<81a6e47c>] (_raw_spin_unlock_irqrestore) from [<80a8f5a8>] (pl011_console_device_unlock+0x20/0x24 drivers/tty/serial/amba-pl011.c:2603)
[<80a8f588>] (pl011_console_device_unlock) from [<802e3750>] (nbcon_emit_one+0x88/0x100 kernel/printk/nbcon.c:1142)
[<802e36c8>] (nbcon_emit_one) from [<802e3970>] (nbcon_kthread_func+0x1a8/0x2a4 kernel/printk/nbcon.c:1229)
 r6:8280c690 r5:83babc00 r4:829594f8
[<802e37c8>] (nbcon_kthread_func) from [<8028020c>] (kthread+0x12c/0x280 kernel/kthread.c:463)
 r10:00000000 r9:829594f8 r8:802e37c8 r7:84a25a80 r6:84a25a80 r5:83babc00
 r4:00000001
[<802800e0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xeac75fb0 to 0xeac75ff8)
5fa0:                                     00000000 00000000 00000000 00000000
5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:802800e0
 r4:84707cc0