INFO: task syz-executor.0:9654 blocked for more than 430 seconds.
      Not tainted 5.16.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:    0 pid: 9654 ppid:  2233 flags:0x00000001
Backtrace: 
[<81712400>] (__schedule) from [<81712e58>] (schedule+0x54/0xdc kernel/sched/core.c:6326)
 r10:83927ae8 r9:852d0880 r8:849cec80 r7:838f7800 r6:838f7800 r5:836d49f8
 r4:84337300
[<81712e04>] (schedule) from [<8071abf4>] (blk_mq_freeze_queue_wait+0x6c/0xa4 block/blk-mq.c:178)
 r5:836d49f8 r4:836d4e60
[<8071ab88>] (blk_mq_freeze_queue_wait) from [<8071db68>] (blk_freeze_queue block/blk-mq.c:205 [inline])
[<8071ab88>] (blk_mq_freeze_queue_wait) from [<8071db68>] (blk_mq_freeze_queue+0x1c/0x20 block/blk-mq.c:214)
 r5:852d0880 r4:836d49f0
[<8071db4c>] (blk_mq_freeze_queue) from [<80a00d6c>] (nbd_add_socket+0x70/0x208 drivers/block/nbd.c:1109)
 r5:852d0880 r4:00000000
[<80a00cfc>] (nbd_add_socket) from [<80a011b0>] (__nbd_ioctl drivers/block/nbd.c:1454 [inline])
[<80a00cfc>] (nbd_add_socket) from [<80a011b0>] (nbd_ioctl+0x2ac/0x38c drivers/block/nbd.c:1511)
 r9:852d0880 r8:838f7880 r7:82c83b80 r6:838f7800 r5:00000005 r4:0000ab00
[<80a00f04>] (nbd_ioctl) from [<807268dc>] (blkdev_ioctl+0x364/0xc58 block/ioctl.c:609)
 r10:83927ae8 r9:00000003 r8:480a001d r7:00000005 r6:82c83b80 r5:0000ab00
 r4:80a00f04
[<80726578>] (blkdev_ioctl) from [<804990a8>] (vfs_ioctl fs/ioctl.c:51 [inline])
[<80726578>] (blkdev_ioctl) from [<804990a8>] (do_vfs_ioctl fs/ioctl.c:834 [inline])
[<80726578>] (blkdev_ioctl) from [<804990a8>] (__do_sys_ioctl fs/ioctl.c:872 [inline])
[<80726578>] (blkdev_ioctl) from [<804990a8>] (sys_ioctl+0x110/0xaa0 fs/ioctl.c:860)
 r10:83927ae8 r9:00000003 r8:8547fe40 r7:00000005 r6:8547fe41 r5:00000000
 r4:0000ab00
[<80498f98>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:64)
Exception stack(0x8566bfa8 to 0x8566bff0)
bfa0:                   00000000 00000000 00000003 0000ab00 00000005 00000000
bfc0: 00000000 00000000 00000000 00000036 7ee3931a 76f796d0 7ee394a4 76f7920c
bfe0: 76f79048 76f79038 00018e9c 0004ba40
 r10:00000036 r9:84337300 r8:80200244 r7:00000036 r6:00000000 r5:00000000
 r4:00000000
NMI backtrace for cpu 1
CPU: 1 PID: 26 Comm: khungtaskd Not tainted 5.16.0-rc1-syzkaller #0
Hardware name: ARM-Versatile Express
Backtrace: 
[<816f56d0>] (dump_backtrace) from [<816f58bc>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:237)
 r7:00000001 r6:00000000 r5:60000093 r4:81d6017c
[<816f58a4>] (show_stack) from [<816fe314>] (__dump_stack lib/dump_stack.c:88 [inline])
[<816f58a4>] (show_stack) from [<816fe314>] (dump_stack_lvl+0x48/0x54 lib/dump_stack.c:106)
[<816fe2cc>] (dump_stack_lvl) from [<816fe338>] (dump_stack+0x18/0x1c lib/dump_stack.c:113)
 r5:00000013 r4:00000001
[<816fe320>] (dump_stack) from [<8083cd6c>] (nmi_cpu_backtrace+0x114/0x180 lib/nmi_backtrace.c:105)
[<8083cc58>] (nmi_cpu_backtrace) from [<8083ceec>] (nmi_trigger_cpumask_backtrace+0x114/0x1d0 lib/nmi_backtrace.c:62)
 r7:00000001 r6:8220c494 r5:8220cc70 r4:00000000
[<8083cdd8>] (nmi_trigger_cpumask_backtrace) from [<80210c54>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:865)
 r9:0006e580 r8:82204d00 r7:00007f66 r6:824839b0 r5:8220c5d4 r4:8343a940
[<80210c3c>] (arch_trigger_cpumask_backtrace) from [<80329f7c>] (trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline])
[<80210c3c>] (arch_trigger_cpumask_backtrace) from [<80329f7c>] (check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline])
[<80210c3c>] (arch_trigger_cpumask_backtrace) from [<80329f7c>] (watchdog+0x4a0/0x58c kernel/hung_task.c:295)
[<80329adc>] (watchdog) from [<8026a518>] (kthread+0x164/0x198 kernel/kthread.c:327)
 r10:8294de4c r9:00000000 r8:00000000 r7:80329adc r6:828cf180 r5:82a89240
 r4:828f2e00
[<8026a3b4>] (kthread) from [<80200100>] (ret_from_fork+0x14/0x34 arch/arm/kernel/entry-common.S:146)
Exception stack(0x82a25fb0 to 0x82a25ff8)
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 r5:8026a3b4
 r4:82a89240
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 2015 Comm: syslogd Not tainted 5.16.0-rc1-syzkaller #0
Hardware name: ARM-Versatile Express
PC is at do_raw_write_seqcount_begin include/linux/seqlock.h:473 [inline]
PC is at do_write_seqcount_begin_nested include/linux/seqlock.h:519 [inline]
PC is at do_write_seqcount_begin include/linux/seqlock.h:545 [inline]
PC is at i_size_write include/linux/fs.h:904 [inline]
PC is at shmem_write_end+0xfc/0x198 mm/shmem.c:2480
LR is at get_lock_parent_ip include/linux/ftrace.h:891 [inline]
LR is at preempt_latency_start kernel/sched/core.c:5413 [inline]
LR is at preempt_count_add+0x88/0x15c kernel/sched/core.c:5438
pc : [<803fa814>]    lr : [<80274810>]    psr: 600e0013
sp : 83a2ddc0  ip : 83a2dd98  fp : 83a2ddec
r10: 83a2def0  r9 : 00015a45  r8 : 00000000
r7 : 8376b900  r6 : 0000005c  r5 : 000159e9  r4 : dec482ac
r3 : 81719128  r2 : 000159e9  r1 : 8376ba10  r0 : 00000000
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 84160500  DAC: fffffffd
CPU: 0 PID: 2015 Comm: syslogd Not tainted 5.16.0-rc1-syzkaller #0
Hardware name: ARM-Versatile Express
Backtrace: 
[<816f56d0>] (dump_backtrace) from [<816f58bc>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:237)
 r7:00000017 r6:83a2dd70 r5:600e0193 r4:81d6017c
[<816f58a4>] (show_stack) from [<816fe314>] (__dump_stack lib/dump_stack.c:88 [inline])
[<816f58a4>] (show_stack) from [<816fe314>] (dump_stack_lvl+0x48/0x54 lib/dump_stack.c:106)
[<816fe2cc>] (dump_stack_lvl) from [<816fe338>] (dump_stack+0x18/0x1c lib/dump_stack.c:113)
 r5:000e0193 r4:00000000
[<816fe320>] (dump_stack) from [<80209080>] (show_regs+0x14/0x18 arch/arm/kernel/process.c:199)
[<8020906c>] (show_regs) from [<8083cd54>] (nmi_cpu_backtrace+0xfc/0x180 lib/nmi_backtrace.c:103)
[<8083cc58>] (nmi_cpu_backtrace) from [<8020fd58>] (do_handle_IPI+0x4c/0x3b4 arch/arm/kernel/smp.c:680)
 r7:00000017 r6:00000000 r5:8280cb80 r4:00000007
[<8020fd0c>] (do_handle_IPI) from [<802100e0>] (ipi_handler+0x20/0x28 arch/arm/kernel/smp.c:708)
 r9:84332280 r8:83a2dcd8 r7:00000017 r6:8220cc8c r5:8280cb80 r4:82885d00
[<802100c0>] (ipi_handler) from [<802b9530>] (handle_percpu_devid_irq+0x9c/0x2d4 kernel/irq/chip.c:933)
[<802b9494>] (handle_percpu_devid_irq) from [<802b2ba0>] (generic_handle_irq_desc include/linux/irqdesc.h:158 [inline])
[<802b9494>] (handle_percpu_devid_irq) from [<802b2ba0>] (handle_irq_desc kernel/irq/irqdesc.c:646 [inline])
[<802b9494>] (handle_percpu_devid_irq) from [<802b2ba0>] (generic_handle_domain_irq+0x48/0x8c kernel/irq/irqdesc.c:680)
 r10:83a2def0 r9:84332280 r8:00000000 r7:df80200c r6:84332280 r5:00000007
 r4:82888000 r3:802b9494
[<802b2b58>] (generic_handle_domain_irq) from [<8084fa80>] (gic_handle_irq+0x68/0x7c drivers/irqchip/irq-gic.c:372)
 r7:df80200c r6:820a5fc4 r5:df802000 r4:8220cc8c
[<8084fa18>] (gic_handle_irq) from [<81710264>] (generic_handle_arch_irq+0x60/0x80 kernel/irq/handle.c:243)
 r7:83a2dd70 r6:81f092c0 r5:81f092d8 r4:820a5fb8
[<81710204>] (generic_handle_arch_irq) from [<80200abc>] (__irq_svc+0x3c/0x64 arch/arm/kernel/entry-armv.S:202)
Exception stack(0x83a2dd70 to 0x83a2ddb8)
dd60:                                     00000000 8376ba10 000159e9 81719128
dd80: dec482ac 000159e9 0000005c 8376b900 00000000 00015a45 83a2def0 83a2ddec
dda0: 83a2dd98 83a2ddc0 80274810 803fa814 600e0013 ffffffff
 r9:84332280 r8:00000000 r7:83a2dda4 r6:ffffffff r5:600e0013 r4:803fa814
[<803fa718>] (shmem_write_end) from [<803d5aa8>] (generic_perform_write+0x128/0x200 mm/filemap.c:3767)
 r9:803fa718 r8:8376ba10 r7:00000000 r6:81817340 r5:000159e9 r4:0000005c
[<803d5980>] (generic_perform_write) from [<803d6e68>] (__generic_file_write_iter+0x12c/0x190 mm/filemap.c:3883)
 r10:83a2def0 r9:8547f180 r8:8376ba10 r7:00000000 r6:84332280 r5:83a2df08
 r4:00000000
[<803d6d3c>] (__generic_file_write_iter) from [<803d6f30>] (generic_file_write_iter+0x64/0xd0 mm/filemap.c:3915)
 r10:00004004 r9:84332280 r8:83a2df68 r7:83a2def0 r6:83a2df08 r5:8376b988
 r4:0000005c
[<803d6ecc>] (generic_file_write_iter) from [<80482a84>] (call_write_iter include/linux/fs.h:2162 [inline])
[<803d6ecc>] (generic_file_write_iter) from [<80482a84>] (new_sync_write fs/read_write.c:503 [inline])
[<803d6ecc>] (generic_file_write_iter) from [<80482a84>] (vfs_write+0x30c/0x444 fs/read_write.c:590)
 r7:00000000 r6:0000005c r5:8547f180 r4:00000010
[<80482778>] (vfs_write) from [<80482d24>] (ksys_write+0x68/0xec fs/read_write.c:643)
 r10:00000004 r9:84332280 r8:80200244 r7:00000000 r6:000159e9 r5:8547f180
 r4:8547f180
[<80482cbc>] (ksys_write) from [<80482db8>] (__do_sys_write fs/read_write.c:655 [inline])
[<80482cbc>] (ksys_write) from [<80482db8>] (sys_write+0x10/0x14 fs/read_write.c:652)
 r7:00000004 r6:76ff5080 r5:0068f4b8 r4:00000003
[<80482da8>] (sys_write) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:64)
Exception stack(0x83a2dfa8 to 0x83a2dff0)
dfa0:                   00000003 0068f4b8 00000003 0068f4b8 0000005c 00000000
dfc0: 00000003 0068f4b8 76ff5080 00000004 000d6c84 000d6cb0 000d6c90 7ed0ac9c
dfe0: 000d63bc 7ed0abb0 00019aa8 76f197bc