INFO: task syz-executor.1:28703 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.1 state:D stack: 0 pid:28703 ppid: 25752 flags:0x00000001 Backtrace: [<81712400>] (__schedule) from [<81712e58>] (schedule+0x54/0xdc kernel/sched/core.c:6326) r10:839ff718 r9:8699a680 r8:84b3ec80 r7:82986800 r6:82986800 r5:83b08008 r4:8582dc00 [<81712e04>] (schedule) from [<8071abf4>] (blk_mq_freeze_queue_wait+0x6c/0xa4 block/blk-mq.c:178) r5:83b08008 r4:83b08470 [<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) r5:8699a680 r4:83b08000 [<8071db4c>] (blk_mq_freeze_queue) from [<80a00d6c>] (nbd_add_socket+0x70/0x208 drivers/block/nbd.c:1109) r5:8699a680 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) r9:8699a680 r8:82986880 r7:83100000 r6:82986800 r5:00000004 r4:0000ab00 [<80a00f04>] (nbd_ioctl) from [<807268dc>] (blkdev_ioctl+0x364/0xc58 block/ioctl.c:609) r10:839ff718 r9:00000003 r8:480a001d r7:00000004 r6:83100000 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) r10:839ff718 r9:00000003 r8:85630cc0 r7:00000004 r6:85630cc1 r5:00000000 r4:0000ab00 [<80498f98>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:64) Exception stack(0x86ae3fa8 to 0x86ae3ff0) 3fa0: 00000000 00000000 00000003 0000ab00 00000004 00000000 3fc0: 00000000 00000000 00000000 00000036 7ef9731a 76fdc6d0 7ef974a4 76fdc20c 3fe0: 76fdc048 76fdc038 00018e9c 0004ba40 r10:00000036 r9:8582dc00 r8:80200244 r7:00000036 r6:00000000 r5:00000000 r4:00000000 INFO: task syz-executor.1:28707 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.1 state:D stack: 0 pid:28707 ppid: 25752 flags:0x00000001 Backtrace: [<81712400>] (__schedule) from [<81712e58>] (schedule+0x54/0xdc kernel/sched/core.c:6326) r10:839ff718 r9:8699a680 r8:82986884 r7:86a5ddec r6:00000002 r5:868e4500 r4:868e4500 [<81712e04>] (schedule) from [<81713474>] (schedule_preempt_disabled+0x18/0x24 kernel/sched/core.c:6385) r5:868e4500 r4:82986880 [<8171345c>] (schedule_preempt_disabled) from [<817147ac>] (__mutex_lock_common kernel/locking/mutex.c:680 [inline]) [<8171345c>] (schedule_preempt_disabled) from [<817147ac>] (__mutex_lock.constprop.0+0x170/0x54c kernel/locking/mutex.c:740) [<8171463c>] (__mutex_lock.constprop.0) from [<81714c5c>] (__mutex_lock_slowpath+0x14/0x18 kernel/locking/mutex.c:1028) r9:8699a680 r8:82986880 r7:83100000 r6:82986800 r5:00000004 r4:0000ab00 [<81714c48>] (__mutex_lock_slowpath) from [<81714c9c>] (mutex_lock+0x3c/0x40 kernel/locking/mutex.c:283) [<81714c60>] (mutex_lock) from [<80a00f64>] (nbd_ioctl+0x60/0x38c drivers/block/nbd.c:1504) [<80a00f04>] (nbd_ioctl) from [<807268dc>] (blkdev_ioctl+0x364/0xc58 block/ioctl.c:609) r10:839ff718 r9:00000003 r8:480a001d r7:00000004 r6:83100000 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) r10:839ff718 r9:00000003 r8:85630e40 r7:00000004 r6:85630e41 r5:00000000 r4:0000ab00 [<80498f98>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:64) Exception stack(0x86a5dfa8 to 0x86a5dff0) dfa0: 00000000 00000000 00000003 0000ab00 00000004 00000000 dfc0: 00000000 00000000 00000000 00000036 7ef9731a 76f796d0 7ef974a4 76f7920c dfe0: 76f79048 76f79038 00018e9c 0004ba40 r10:00000036 r9:868e4500 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 r5:600d0093 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) r5:000d0013 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) r9:000bab40 r8:82204d00 r7:00007f29 r6:824839b0 r5:8220c5d4 r4:8343bf40 [<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: 2018 Comm: klogd Not tainted 5.16.0-rc1-syzkaller #0 Hardware name: ARM-Versatile Express PC is at prefetch_freepointer mm/slub.c:357 [inline] PC is at slab_alloc_node mm/slub.c:3226 [inline] PC is at slab_alloc mm/slub.c:3242 [inline] PC is at kmem_cache_alloc+0x25c/0x3b4 mm/slub.c:3247 LR is at 0x12f0649 pc : [<80460be8>] lr : [<012f0649>] psr: 600f0013 sp : 838e3cf0 ip : 012f0651 fp : 838e3d34 r10: 844dd900 r9 : 600f0013 r8 : 812ab2b0 r7 : 8220c978 r6 : 00400cc0 r5 : 00000000 r4 : 8289c480 r3 : dddeb018 r2 : dddeb01c r1 : 838e3cf0 r0 : 5bd3e000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 83f42980 DAC: 00000000 CPU: 1 PID: 2018 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 r6:838e3ca0 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 r4:00000001 [<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) r9:837d1700 r8:838e3c08 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) r10:844dd900 r9:837d1700 r8:00000000 r7:df80200c r6:837d1700 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) r7:838e3ca0 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(0x838e3ca0 to 0x838e3ce8) 3ca0: 5bd3e000 838e3cf0 dddeb01c dddeb018 8289c480 00000000 00400cc0 8220c978 3cc0: 812ab2b0 600f0013 844dd900 838e3d34 012f0651 838e3cf0 012f0649 80460be8 3ce0: 600f0013 ffffffff r9:837d1700 r8:812ab2b0 r7:838e3cd4 r6:ffffffff r5:600f0013 r4:80460be8 [<8046098c>] (kmem_cache_alloc) from [<812ab2b0>] (kmem_cache_alloc_node include/linux/slab.h:462 [inline]) [<8046098c>] (kmem_cache_alloc) from [<812ab2b0>] (__alloc_skb+0x128/0x178 net/core/skbuff.c:414) r10:7fffffff r9:8289c480 r8:00000000 r7:812b093c r6:00400cc0 r5:0000007c r4:00000fff [<812ab188>] (__alloc_skb) from [<812b093c>] (alloc_skb include/linux/skbuff.h:1126 [inline]) [<812ab188>] (__alloc_skb) from [<812b093c>] (alloc_skb_with_frags+0x44/0x1a0 net/core/skbuff.c:6078) r10:7fffffff r9:838e3e2c r8:00000000 r7:0000007c r6:00000003 r5:00000000 r4:00000fff [<812b08f8>] (alloc_skb_with_frags) from [<812a3764>] (sock_alloc_send_pskb+0x208/0x22c net/core/sock.c:2575) r10:7fffffff r9:838e3e2c r8:00000000 r7:0000007c r6:80294eac r5:837d1700 r4:83447900 [<812a355c>] (sock_alloc_send_pskb) from [<81525418>] (unix_dgram_sendmsg+0x14c/0x8f4 net/unix/af_unix.c:1811) r10:83447b74 r9:00000000 r8:83447900 r7:83445500 r6:00000000 r5:8305cf00 r4:838e3eb0 [<815252cc>] (unix_dgram_sendmsg) from [<8129dcc8>] (sock_sendmsg_nosec net/socket.c:704 [inline]) [<815252cc>] (unix_dgram_sendmsg) from [<8129dcc8>] (sock_sendmsg+0x3c/0x4c net/socket.c:724) r10:00000121 r9:837d1700 r8:80200244 r7:00004000 r6:00000000 r5:8305cf00 r4:838e3eb0 [<8129dc8c>] (sock_sendmsg) from [<8129fc14>] (__sys_sendto+0xcc/0x118 net/socket.c:2036) r5:8305cf00 r4:00000000 [<8129fb48>] (__sys_sendto) from [<8129fca4>] (__do_sys_send net/socket.c:2058 [inline]) [<8129fb48>] (__sys_sendto) from [<8129fca4>] (sys_send+0x20/0x28 net/socket.c:2055) r7:00000121 r6:00000001 r5:76f0d080 r4:014bc190 [<8129fc84>] (sys_send) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:64) Exception stack(0x838e3fa8 to 0x838e3ff0) 3fa0: 014bc190 76f0d080 00000003 014c4e60 0000007c 00004000 3fc0: 014bc190 76f0d080 00000001 00000121 7eedbcc0 00000000 76f0d080 00000000 3fe0: 00000000 7eedbbf8 76e3eb88 76e43e78