INFO: task syz-executor.1:28133 blocked for more than 430 seconds. Not tainted 5.15.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack: 0 pid:28133 ppid: 2264 flags:0x00000001 Backtrace: [<816f4018>] (__schedule) from [<816f49dc>] (schedule+0x4c/0xcc kernel/sched/core.c:6323) r10:83889160 r9:8555a200 r8:84affb80 r7:83903f00 r6:83903f00 r5:83623e98 r4:83f9dc00 [<816f4990>] (schedule) from [<8070cae0>] (blk_mq_freeze_queue_wait+0x6c/0xa4 block/blk-mq.c:178) r5:83623e98 r4:83624300 [<8070ca74>] (blk_mq_freeze_queue_wait) from [<8070f7c0>] (blk_freeze_queue block/blk-mq.c:205 [inline]) [<8070ca74>] (blk_mq_freeze_queue_wait) from [<8070f7c0>] (blk_mq_freeze_queue+0x1c/0x20 block/blk-mq.c:214) r5:8555a200 r4:83623e90 [<8070f7a4>] (blk_mq_freeze_queue) from [<809f17b4>] (nbd_add_socket+0x70/0x208 drivers/block/nbd.c:1109) r5:8555a200 r4:00000000 [<809f1744>] (nbd_add_socket) from [<809f1bf8>] (__nbd_ioctl drivers/block/nbd.c:1454 [inline]) [<809f1744>] (nbd_add_socket) from [<809f1bf8>] (nbd_ioctl+0x2ac/0x38c drivers/block/nbd.c:1511) r9:8555a200 r8:83903f80 r7:82c89100 r6:83903f00 r5:00000004 r4:0000ab00 [<809f194c>] (nbd_ioctl) from [<80718598>] (blkdev_ioctl+0x364/0xc5c block/ioctl.c:609) r10:83889160 r9:00000003 r8:480a001d r7:00000004 r6:82c89100 r5:0000ab00 r4:809f194c [<80718234>] (blkdev_ioctl) from [<8048e240>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<80718234>] (blkdev_ioctl) from [<8048e240>] (do_vfs_ioctl fs/ioctl.c:834 [inline]) [<80718234>] (blkdev_ioctl) from [<8048e240>] (__do_sys_ioctl fs/ioctl.c:872 [inline]) [<80718234>] (blkdev_ioctl) from [<8048e240>] (sys_ioctl+0x110/0xab0 fs/ioctl.c:860) r10:83889160 r9:00000003 r8:845e1540 r7:00000004 r6:845e1541 r5:00000000 r4:0000ab00 [<8048e130>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:64) Exception stack(0x82959fa8 to 0x82959ff0) 9fa0: 00000000 00000000 00000003 0000ab00 00000004 00000000 9fc0: 00000000 00000000 00000000 00000036 7ee6131a 76f466d0 7ee614a4 76f4620c 9fe0: 76f46048 76f46038 00018e9c 0004ba40 r10:00000036 r9:83f9dc00 r8:80200244 r7:00000036 r6:00000000 r5:00000000 r4:00000000 NMI backtrace for cpu 0 CPU: 0 PID: 25 Comm: khungtaskd Not tainted 5.15.0-syzkaller #0 Hardware name: ARM-Versatile Express Backtrace: [<816d743c>] (dump_backtrace) from [<816d7628>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:237) r7:8020f468 r6:00000000 r5:60000093 r4:81d5fa2c [<816d7610>] (show_stack) from [<816e019c>] (__dump_stack lib/dump_stack.c:88 [inline]) [<816d7610>] (show_stack) from [<816e019c>] (dump_stack_lvl+0x48/0x54 lib/dump_stack.c:106) [<816e0154>] (dump_stack_lvl) from [<816e01c0>] (dump_stack+0x18/0x1c lib/dump_stack.c:113) r5:00000000 r4:00000013 [<816e01a8>] (dump_stack) from [<8082de4c>] (nmi_cpu_backtrace+0x114/0x180 lib/nmi_backtrace.c:105) [<8082dd38>] (nmi_cpu_backtrace) from [<8082dfc0>] (nmi_trigger_cpumask_backtrace+0x108/0x1a8 lib/nmi_backtrace.c:62) r7:8020f468 r6:8220c494 r5:8220cc70 r4:00000000 [<8082deb8>] (nmi_trigger_cpumask_backtrace) from [<80210754>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:865) r9:000a8140 r8:82204d00 r7:8220c5d4 r6:8221af58 r5:00007f68 r4:83ef9768 [<8021073c>] (arch_trigger_cpumask_backtrace) from [<803249b0>] (trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]) [<8021073c>] (arch_trigger_cpumask_backtrace) from [<803249b0>] (check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]) [<8021073c>] (arch_trigger_cpumask_backtrace) from [<803249b0>] (watchdog+0x464/0x554 kernel/hung_task.c:295) [<8032454c>] (watchdog) from [<8026972c>] (kthread+0x150/0x16c kernel/kthread.c:327) r10:8294de4c r9:00000000 r8:00000000 r7:8032454c r6:828cf180 r5:828f2280 r4:82a891c0 [<802695dc>] (kthread) from [<80200100>] (ret_from_fork+0x14/0x34 arch/arm/kernel/entry-common.S:146) Exception stack(0x82a23fb0 to 0x82a23ff8) 3fa0: 00000000 00000000 00000000 00000000 3fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 3fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:802695dc r4:82a891c0 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.15.0-syzkaller #0 Hardware name: ARM-Versatile Express PC is at arch_cpu_idle+0x4c/0x50 arch/arm/kernel/process.c:77 LR is at arch_cpu_idle+0x48/0x50 arch/arm/kernel/process.c:75 pc : [<80208abc>] lr : [<80208ab8>] psr: 60000013 sp : 82967f58 ip : 82967f68 fp : 82967f64 r10: 00000000 r9 : 00000000 r8 : 00000002 r7 : 8220c4d4 r6 : 00000001 r5 : 8220c494 r4 : 828e9700 r3 : 8021bfe0 r2 : 00000001 r1 : 00000000 r0 : 00a10a92 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 846b9980 DAC: 00000000 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.15.0-syzkaller #0 Hardware name: ARM-Versatile Express Backtrace: [<816d743c>] (dump_backtrace) from [<816d7628>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:237) r7:00000001 r6:82967f08 r5:60000193 r4:81d5fa2c [<816d7610>] (show_stack) from [<816e019c>] (__dump_stack lib/dump_stack.c:88 [inline]) [<816d7610>] (show_stack) from [<816e019c>] (dump_stack_lvl+0x48/0x54 lib/dump_stack.c:106) [<816e0154>] (dump_stack_lvl) from [<816e01c0>] (dump_stack+0x18/0x1c lib/dump_stack.c:113) r5:00000001 r4:00000193 [<816e01a8>] (dump_stack) from [<80208d60>] (show_regs+0x14/0x18 arch/arm/kernel/process.c:199) [<80208d4c>] (show_regs) from [<8082de34>] (nmi_cpu_backtrace+0xfc/0x180 lib/nmi_backtrace.c:103) [<8082dd38>] (nmi_cpu_backtrace) from [<8020f8f8>] (do_handle_IPI+0x40/0x34c arch/arm/kernel/smp.c:680) r7:00000001 r6:828e9700 r5:8280cb80 r4:00000007 [<8020f8b8>] (do_handle_IPI) from [<8020fc24>] (ipi_handler+0x20/0x28 arch/arm/kernel/smp.c:708) r9:828e9700 r8:00000002 r7:00000017 r6:8220cc8c r5:8280cb80 r4:82885d00 [<8020fc04>] (ipi_handler) from [<802b6d28>] (handle_percpu_devid_irq+0x84/0x25c kernel/irq/chip.c:933) [<802b6ca4>] (handle_percpu_devid_irq) from [<802b0524>] (generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]) [<802b6ca4>] (handle_percpu_devid_irq) from [<802b0524>] (handle_irq_desc kernel/irq/irqdesc.c:646 [inline]) [<802b6ca4>] (handle_percpu_devid_irq) from [<802b0524>] (generic_handle_domain_irq+0x48/0x8c kernel/irq/irqdesc.c:680) r10:00000000 r9:828e9700 r8:00000002 r7:df80200c r6:828e9700 r5:00000007 r4:82888000 r3:802b6ca4 [<802b04dc>] (generic_handle_domain_irq) from [<80840b34>] (gic_handle_irq+0x68/0x7c drivers/irqchip/irq-gic.c:372) r7:df80200c r6:820b2e44 r5:df802000 r4:8220cc8c [<80840acc>] (gic_handle_irq) from [<816f2138>] (generic_handle_arch_irq+0x3c/0x4c kernel/irq/handle.c:243) r7:82967f3c r6:00000000 r5:82967f08 r4:820b2e38 [<816f20fc>] (generic_handle_arch_irq) from [<80200abc>] (__irq_svc+0x3c/0x4c arch/arm/kernel/entry-armv.S:202) Exception stack(0x82967f08 to 0x82967f50) 7f00: 00a10a92 00000000 00000001 8021bfe0 828e9700 8220c494 7f20: 00000001 8220c4d4 00000002 00000000 00000000 82967f64 82967f68 82967f58 7f40: 80208ab8 80208abc 60000013 ffffffff r7:82967f3c r6:ffffffff r5:60000013 r4:80208abc [<80208a70>] (arch_cpu_idle) from [<816fa3d4>] (default_idle_call+0x30/0x12c kernel/sched/idle.c:112) [<816fa3a4>] (default_idle_call) from [<8027fc8c>] (cpuidle_idle_call kernel/sched/idle.c:194 [inline]) [<816fa3a4>] (default_idle_call) from [<8027fc8c>] (do_idle+0x234/0x2b8 kernel/sched/idle.c:306) r5:8220c494 r4:828e9700 [<8027fa58>] (do_idle) from [<8027ffdc>] (cpu_startup_entry+0x20/0x24 kernel/sched/idle.c:403) r10:00000000 r9:412fc0f1 r8:80003010 r7:8243c464 r6:828e9700 r5:00000001 r4:00000097 [<8027ffbc>] (cpu_startup_entry) from [<8021025c>] (secondary_start_kernel+0x1bc/0x28c arch/arm/kernel/smp.c:478) [<802100a0>] (secondary_start_kernel) from [<80201534>] (__enable_mmu+0x0/0xc arch/arm/kernel/head.S:431) r7:8243c464 r6:30c0387d r5:00000000 r4:8289bec0