INFO: task syz-executor.0:21786 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:21786 ppid: 2232 flags:0x00000001 Backtrace: [<81712400>] (__schedule) from [<81712e58>] (schedule+0x54/0xdc kernel/sched/core.c:6326) r10:839fc5f0 r9:85c8ce80 r8:84914c80 r7:8391dc00 r6:8391dc00 r5:834f38e8 r4:83f86780 [<81712e04>] (schedule) from [<8071abf4>] (blk_mq_freeze_queue_wait+0x6c/0xa4 block/blk-mq.c:178) r5:834f38e8 r4:834f3d50 [<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) r5:85c8ce80 r4:834f38e0 [<8071db4c>] (blk_mq_freeze_queue) from [<80a00d6c>] (nbd_add_socket+0x70/0x208 drivers/block/nbd.c:1109) r5:85c8ce80 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) r9:85c8ce80 r8:8391dc80 r7:82c88cc0 r6:8391dc00 r5:00000007 r4:0000ab00 [<80a00f04>] (nbd_ioctl) from [<807268dc>] (blkdev_ioctl+0x364/0xc58 block/ioctl.c:609) r10:839fc5f0 r9:00000003 r8:480a001d r7:00000007 r6:82c88cc0 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) r10:839fc5f0 r9:00000003 r8:836f6540 r7:00000007 r6:836f6541 r5:00000000 r4:0000ab00 [<80498f98>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:64) Exception stack(0x85279fa8 to 0x85279ff0) 9fa0: 00000000 00000000 00000003 0000ab00 00000007 00000000 9fc0: 00000000 00000000 00000000 00000036 7ea2231a 76f256d0 7ea224a4 76f2520c 9fe0: 76f25048 76f25038 00018e9c 0004ba40 r10:00000036 r9:83f86780 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: [<816f56d0>] (dump_backtrace) from [<816f58bc>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:237) r7:00000000 r6:00000000 r5:60030093 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) r5:00030013 r4:00000000 [<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) r7:00000000 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) r9:000a1300 r8:82204d00 r7:00007f5f r6:824839b0 r5:8220c5d4 r4:82bb9d40 [<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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.16.0-rc1-syzkaller #0 Hardware name: ARM-Versatile Express PC is at arch_cpu_idle+0x48/0x4c arch/arm/kernel/process.c:77 LR is at arch_cpu_idle+0x44/0x4c arch/arm/kernel/process.c:75 pc : [<80208ddc>] lr : [<80208dd8>] psr: 200d0013 sp : 82969f50 ip : 82969f40 fp : 82969f5c r10: 00000000 r9 : 00000000 r8 : 00000002 r7 : 8220c4d4 r6 : 00000001 r5 : 00000001 r4 : 828ea280 r3 : 8021ca60 r2 : 00000000 r1 : 81d6017c r0 : 00000001 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84141d40 DAC: 00000000 CPU: 1 PID: 0 Comm: swapper/1 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 r6:82969f00 r5:600d0193 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) r5:000d0193 r4:00000001 [<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 r6:00000001 r5:8280cb80 r4:00000007 [<8020fd0c>] (do_handle_IPI) from [<802100e0>] (ipi_handler+0x20/0x28 arch/arm/kernel/smp.c:708) r9:828ea280 r8:82969e68 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) r10:00000000 r9:828ea280 r8:00000000 r7:df80200c r6:828ea280 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) r7:82969f00 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(0x82969f00 to 0x82969f48) 9f00: 00000001 81d6017c 00000000 8021ca60 828ea280 00000001 00000001 8220c4d4 9f20: 00000002 00000000 00000000 82969f5c 82969f40 82969f50 80208dd8 80208ddc 9f40: 200d0013 ffffffff r9:828ea280 r8:00000002 r7:82969f34 r6:ffffffff r5:200d0013 r4:80208ddc [<80208d94>] (arch_cpu_idle) from [<81718fc4>] (default_idle_call+0x38/0x19c kernel/sched/idle.c:112) [<81718f8c>] (default_idle_call) from [<80281700>] (cpuidle_idle_call kernel/sched/idle.c:194 [inline]) [<81718f8c>] (default_idle_call) from [<80281700>] (do_idle+0x220/0x2a8 kernel/sched/idle.c:306) r7:8220c4d4 r6:828ea280 r5:00000001 r4:8220c494 [<802814e0>] (do_idle) from [<80281a84>] (cpu_startup_entry+0x20/0x24 kernel/sched/idle.c:403) r10:00000000 r9:412fc0f1 r8:80003010 r7:8243c464 r6:828ea280 r5:8230a958 r4:00000097 [<80281a64>] (cpu_startup_entry) from [<80210724>] (secondary_start_kernel+0x1c8/0x298 arch/arm/kernel/smp.c:478) [<8021055c>] (secondary_start_kernel) from [<80201614>] (__enable_mmu+0x0/0xc arch/arm/kernel/head.S:431) r7:8243c464 r6:30c0387d r5:00000000 r4:8289bf40