INFO: task syz-executor.0:21050 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:21050 ppid:  6161 flags:0x00000001
Backtrace: 
[<816d5388>] (__schedule) from [<816d5de0>] (schedule+0x54/0xdc kernel/sched/core.c:6326)
 r10:8384c408 r9:847e0e00 r8:830cd180 r7:83a66900 r6:83a66900 r5:8389b8e8
 r4:847ddc00
[<816d5d8c>] (schedule) from [<8071ae2c>] (blk_mq_freeze_queue_wait+0x6c/0xa4 block/blk-mq.c:178)
 r5:8389b8e8 r4:8389bd50
[<8071adc0>] (blk_mq_freeze_queue_wait) from [<8071dda0>] (blk_freeze_queue block/blk-mq.c:205 [inline])
[<8071adc0>] (blk_mq_freeze_queue_wait) from [<8071dda0>] (blk_mq_freeze_queue+0x1c/0x20 block/blk-mq.c:214)
 r5:847e0e00 r4:8389b8e0
[<8071dd84>] (blk_mq_freeze_queue) from [<809c390c>] (nbd_add_socket+0x70/0x208 drivers/block/nbd.c:1109)
 r5:847e0e00 r4:00000000
[<809c389c>] (nbd_add_socket) from [<809c3d50>] (__nbd_ioctl drivers/block/nbd.c:1454 [inline])
[<809c389c>] (nbd_add_socket) from [<809c3d50>] (nbd_ioctl+0x2ac/0x38c drivers/block/nbd.c:1511)
 r9:847e0e00 r8:83a66980 r7:830eccc0 r6:83a66900 r5:00000005 r4:0000ab00
[<809c3aa4>] (nbd_ioctl) from [<80726b14>] (blkdev_ioctl+0x364/0xc58 block/ioctl.c:609)
 r10:8384c408 r9:00000003 r8:480a001d r7:00000005 r6:830eccc0 r5:0000ab00
 r4:809c3aa4
[<807267b0>] (blkdev_ioctl) from [<804992d8>] (vfs_ioctl fs/ioctl.c:51 [inline])
[<807267b0>] (blkdev_ioctl) from [<804992d8>] (do_vfs_ioctl fs/ioctl.c:834 [inline])
[<807267b0>] (blkdev_ioctl) from [<804992d8>] (__do_sys_ioctl fs/ioctl.c:872 [inline])
[<807267b0>] (blkdev_ioctl) from [<804992d8>] (sys_ioctl+0x110/0xaa0 fs/ioctl.c:860)
 r10:8384c408 r9:00000003 r8:83735480 r7:00000005 r6:83735481 r5:00000000
 r4:0000ab00
[<804991c8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:64)
Exception stack(0x853b9fa8 to 0x853b9ff0)
9fa0:                   00000000 00000000 00000003 0000ab00 00000005 00000000
9fc0: 00000000 00000000 00000000 00000036 7e99331a 76f556d0 7e9934a4 76f5520c
9fe0: 76f55048 76f55038 00018e9c 0004ba40
 r10:00000036 r9:847ddc00 r8:80200244 r7:00000036 r6:00000000 r5:00000000
 r4:00000000
NMI backtrace for cpu 0
CPU: 0 PID: 26 Comm: khungtaskd Not tainted 5.16.0-rc1-syzkaller #0
Hardware name: ARM-Versatile Express
Backtrace: 
[<816b8658>] (dump_backtrace) from [<816b8844>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:237)
 r7:00000000 r6:00000000 r5:60000093 r4:81d6031c
[<816b882c>] (show_stack) from [<816c129c>] (__dump_stack lib/dump_stack.c:88 [inline])
[<816b882c>] (show_stack) from [<816c129c>] (dump_stack_lvl+0x48/0x54 lib/dump_stack.c:106)
[<816c1254>] (dump_stack_lvl) from [<816c12c0>] (dump_stack+0x18/0x1c lib/dump_stack.c:113)
 r5:00000013 r4:00000000
[<816c12a8>] (dump_stack) from [<807ff90c>] (nmi_cpu_backtrace+0x114/0x180 lib/nmi_backtrace.c:111)
[<807ff7f8>] (nmi_cpu_backtrace) from [<807ffa90>] (nmi_trigger_cpumask_backtrace+0x118/0x1d4 lib/nmi_backtrace.c:62)
 r7:00000000 r6:8220c494 r5:8220cc70 r4:00000000
[<807ff978>] (nmi_trigger_cpumask_backtrace) from [<80210c54>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:865)
 r9:000fe301 r8:82204d00 r7:00007f5a r6:824839b0 r5:8220c5d4 r4:8376e640
[<80210c3c>] (arch_trigger_cpumask_backtrace) from [<80329fa4>] (trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline])
[<80210c3c>] (arch_trigger_cpumask_backtrace) from [<80329fa4>] (check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline])
[<80210c3c>] (arch_trigger_cpumask_backtrace) from [<80329fa4>] (watchdog+0x4a0/0x58c kernel/hung_task.c:295)
[<80329b04>] (watchdog) from [<8026a518>] (kthread+0x164/0x198 kernel/kthread.c:327)
 r10:8294de4c r9:00000000 r8:00000000 r7:80329b04 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 2014 Comm: syslogd Not tainted 5.16.0-rc1-syzkaller #0
Hardware name: ARM-Versatile Express
PC is at 0x76f187bc
LR is at 0x19aa8
pc : [<76f187bc>]    lr : [<00019aa8>]    psr: 600d0010
sp : 7edf2bb0  ip : 000d63bc  fp : 7edf2c9c
r10: 000d6c90  r9 : 000d6cb0  r8 : 000d6c84
r7 : 00000004  r6 : 76ff4080  r5 : 01f164b8  r4 : 00000003
r3 : 00000000  r2 : 0000008d  r1 : 01f164b8  r0 : 0000008d
Flags: nZCv  IRQs on  FIQs on  Mode USER_32  ISA ARM  Segment none
Control: 30c5387d  Table: 8441ba00  DAC: 00000000
CPU: 1 PID: 2014 Comm: syslogd Not tainted 5.16.0-rc1-syzkaller #0
Hardware name: ARM-Versatile Express
Backtrace: 
[<816b8658>] (dump_backtrace) from [<816b8844>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:237)
 r7:00000017 r6:840e3fb0 r5:600d0193 r4:81d6031c
[<816b882c>] (show_stack) from [<816c129c>] (__dump_stack lib/dump_stack.c:88 [inline])
[<816b882c>] (show_stack) from [<816c129c>] (dump_stack_lvl+0x48/0x54 lib/dump_stack.c:106)
[<816c1254>] (dump_stack_lvl) from [<816c12c0>] (dump_stack+0x18/0x1c lib/dump_stack.c:113)
 r5:000d0193 r4:00000001
[<816c12a8>] (dump_stack) from [<80209080>] (show_regs+0x14/0x18 arch/arm/kernel/process.c:199)
[<8020906c>] (show_regs) from [<807ff8f4>] (nmi_cpu_backtrace+0xfc/0x180 lib/nmi_backtrace.c:109)
[<807ff7f8>] (nmi_cpu_backtrace) from [<8020fd58>] (do_handle_IPI+0x4c/0x3b4 arch/arm/kernel/smp.c:680)
 r7:00000017 r6:00000001 r5:8280cb80 r4:00000007
[<8020fd0c>] (do_handle_IPI) from [<802100e0>] (ipi_handler+0x20/0x28 arch/arm/kernel/smp.c:708)
 r9:000d6cb0 r8:840e3f18 r7:00000017 r6:8220cc8c r5:8280cb80 r4:82885d00
[<802100c0>] (ipi_handler) from [<802b9558>] (handle_percpu_devid_irq+0x9c/0x2d4 kernel/irq/chip.c:933)
[<802b94bc>] (handle_percpu_devid_irq) from [<802b2bc8>] (generic_handle_irq_desc include/linux/irqdesc.h:158 [inline])
[<802b94bc>] (handle_percpu_devid_irq) from [<802b2bc8>] (handle_irq_desc kernel/irq/irqdesc.c:646 [inline])
[<802b94bc>] (handle_percpu_devid_irq) from [<802b2bc8>] (generic_handle_domain_irq+0x48/0x8c kernel/irq/irqdesc.c:680)
 r10:000d6c90 r9:000d6cb0 r8:00000000 r7:df80200c r6:83eddc00 r5:00000007
 r4:82888000 r3:802b94bc
[<802b2b80>] (generic_handle_domain_irq) from [<80812624>] (gic_handle_irq+0x68/0x7c drivers/irqchip/irq-gic.c:372)
 r7:df80200c r6:820a5fc4 r5:df802000 r4:8220cc8c
[<808125bc>] (gic_handle_irq) from [<816d31ec>] (generic_handle_arch_irq+0x60/0x80 kernel/irq/handle.c:243)
 r7:840e3fb0 r6:81f094b4 r5:81f094cc r4:820a5fb8
[<816d318c>] (generic_handle_arch_irq) from [<80200dbc>] (__irq_usr+0x5c/0x80 arch/arm/kernel/entry-armv.S:429)
Exception stack(0x840e3fb0 to 0x840e3ff8)
3fa0:                                     0000008d 01f164b8 0000008d 00000000
3fc0: 00000003 01f164b8 76ff4080 00000004 000d6c84 000d6cb0 000d6c90 7edf2c9c
3fe0: 000d63bc 7edf2bb0 00019aa8 76f187bc 600d0010 ffffffff
 r9:000d6cb0 r8:5bd3e000 r7:83eddc00 r6:ffffffff r5:600d0010 r4:76f187bc