INFO: task syz-executor.0:15869 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:15869 ppid:  2233 flags:0x00000001
Backtrace: 
[<81712400>] (__schedule) from [<81712e58>] (schedule+0x54/0xdc kernel/sched/core.c:6326)
 r10:839cef78 r9:8520f780 r8:846f6280 r7:83a06900 r6:83a06900 r5:8396b8e8
 r4:834de780
[<81712e04>] (schedule) from [<8071abf4>] (blk_mq_freeze_queue_wait+0x6c/0xa4 block/blk-mq.c:178)
 r5:8396b8e8 r4:8396bd50
[<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)
 r5:8520f780 r4:8396b8e0
[<8071db4c>] (blk_mq_freeze_queue) from [<80a00d6c>] (nbd_add_socket+0x70/0x208 drivers/block/nbd.c:1109)
 r5:8520f780 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)
 r9:8520f780 r8:83a06980 r7:830c8880 r6:83a06900 r5:00000004 r4:0000ab00
[<80a00f04>] (nbd_ioctl) from [<807268dc>] (blkdev_ioctl+0x364/0xc58 block/ioctl.c:609)
 r10:839cef78 r9:00000003 r8:480a001d r7:00000004 r6:830c8880 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)
 r10:839cef78 r9:00000003 r8:82899600 r7:00000004 r6:82899601 r5:00000000
 r4:0000ab00
[<80498f98>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:64)
Exception stack(0x84a6ffa8 to 0x84a6fff0)
ffa0:                   00000000 00000000 00000003 0000ab00 00000004 00000000
ffc0: 00000000 00000000 00000000 00000036 7ed3f31a 76f476d0 7ed3f4a4 76f4720c
ffe0: 76f47048 76f47038 00018e9c 0004ba40
 r10:00000036 r9:834de780 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)
 r9:0008d780 r8:82204d00 r7:00007f65 r6:824839b0 r5:8220c5d4 r4:83aa3240
[<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: 2019 Comm: klogd Not tainted 5.16.0-rc1-syzkaller #0
Hardware name: ARM-Versatile Express
PC is at 0x76dc1ad8
LR is at 0x5
pc : [<76dc1ad8>]    lr : [<00000005>]    psr: 600f0010
sp : 7ee60c70  ip : 00000000  fp : 00000000
r10: 19999999  r9 : 76eab30c  r8 : 000d6880
r7 : 000d6881  r6 : 00000000  r5 : 00000000  r4 : 0000003e
r3 : 00000000  r2 : 0000000a  r1 : 000d6882  r0 : 00000003
Flags: nZCv  IRQs on  FIQs on  Mode USER_32  ISA ARM  Segment user
Control: 30c5387d  Table: 84285bc0  DAC: fffffffd
CPU: 0 PID: 2019 Comm: klogd 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 r6:84015fb0 r5:600f0193 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)
 r5:000f0193 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)
 r9:76eab30c r8:84015f18 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)
 r10:19999999 r9:76eab30c r8:00000000 r7:df80200c r6:8401d080 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)
 r7:84015fb0 r6:81f092c0 r5:81f092d8 r4:820a5fb8
[<81710204>] (generic_handle_arch_irq) from [<80200dbc>] (__irq_usr+0x5c/0x80 arch/arm/kernel/entry-armv.S:429)
Exception stack(0x84015fb0 to 0x84015ff8)
5fa0:                                     00000003 000d6882 0000000a 00000000
5fc0: 0000003e 00000000 00000000 000d6881 000d6880 76eab30c 19999999 00000000
5fe0: 00000000 7ee60c70 00000005 76dc1ad8 600f0010 ffffffff
 r9:76eab30c r8:5bd2d000 r7:8401d080 r6:ffffffff r5:600f0010 r4:76dc1ad8