INFO: task kworker/0:11:9357 blocked for more than 430 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:11 state:D stack:0 pid:9357 tgid:9357 ppid:2 task_flags:0x4208060 flags:0x00000000 Workqueue: events bpf_prog_free_deferred Call trace: [<81a63614>] (__schedule) from [<81a645a8>] (__schedule_loop kernel/sched/core.c:7011 [inline]) [<81a63614>] (__schedule) from [<81a645a8>] (schedule+0x2c/0x130 kernel/sched/core.c:7026) r10:dfabdd84 r9:00000002 r8:600f0013 r7:829171a0 r6:dfabdd8c r5:85e4bc00 r4:85e4bc00 [<81a6457c>] (schedule) from [<81a64990>] (schedule_preempt_disabled+0x18/0x24 kernel/sched/core.c:7083) r5:85e4bc00 r4:8291719c [<81a64978>] (schedule_preempt_disabled) from [<81a67540>] (__mutex_lock_common kernel/locking/mutex.c:676 [inline]) [<81a64978>] (schedule_preempt_disabled) from [<81a67540>] (__mutex_lock.constprop.0+0x350/0xa24 kernel/locking/mutex.c:760) [<81a671f0>] (__mutex_lock.constprop.0) from [<81a67ce8>] (__mutex_lock_slowpath+0x14/0x18 kernel/locking/mutex.c:1049) r10:8280c960 r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:dfabde08 r4:00000000 [<81a67cd4>] (__mutex_lock_slowpath) from [<81a67d28>] (mutex_lock+0x3c/0x40 kernel/locking/mutex.c:274) [<81a67cec>] (mutex_lock) from [<804e9f5c>] (_vm_unmap_aliases+0x68/0x240 mm/vmalloc.c:2918) [<804e9ef4>] (_vm_unmap_aliases) from [<804edd3c>] (vm_reset_perms mm/vmalloc.c:3349 [inline]) [<804e9ef4>] (_vm_unmap_aliases) from [<804edd3c>] (vfree+0x16c/0x210 mm/vmalloc.c:3428) r10:83016170 r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:85a2a980 r4:00000000 [<804edbd0>] (vfree) from [<80558a28>] (execmem_free+0x30/0x50 mm/execmem.c:503) r9:83018405 r8:85e4bc00 r7:00000000 r6:83018400 r5:00001000 r4:7f049000 [<805589f8>] (execmem_free) from [<803c5f48>] (bpf_jit_free_exec+0x10/0x14 kernel/bpf/core.c:1052) r5:00001000 r4:dfc05000 [<803c5f38>] (bpf_jit_free_exec) from [<803c6328>] (bpf_jit_binary_free kernel/bpf/core.c:1098 [inline]) [<803c5f38>] (bpf_jit_free_exec) from [<803c6328>] (bpf_jit_free+0x68/0xe4 kernel/bpf/core.c:1221) [<803c62c0>] (bpf_jit_free) from [<803c73d0>] (bpf_prog_free_deferred+0x140/0x158 kernel/bpf/core.c:2898) r5:84da478c r4:8668b000 [<803c7290>] (bpf_prog_free_deferred) from [<802785a0>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3263) r7:dddcfd80 r6:83018400 r5:84da478c r4:8668b000 [<802783ec>] (process_one_work) from [<802791e8>] (process_scheduled_works kernel/workqueue.c:3346 [inline]) [<802783ec>] (process_one_work) from [<802791e8>] (worker_thread+0x1fc/0x3d8 kernel/workqueue.c:3427) r10:61c88647 r9:85e4bc00 r8:8668b02c r7:82804d40 r6:dddcfd80 r5:dddcfda0 r4:8668b000 [<80278fec>] (worker_thread) from [<8028020c>] (kthread+0x12c/0x280 kernel/kthread.c:463) r10:00000000 r9:8668b000 r8:80278fec r7:ea5a1e60 r6:8668b780 r5:85e4bc00 r4:00000001 [<802800e0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xdfabdfb0 to 0xdfabdff8) dfa0: 00000000 00000000 00000000 00000000 dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:802800e0 r4:85c1a340 INFO: task kworker/0:11:9357 is blocked on a mutex likely owned by task kworker/0:13:9366. task:kworker/0:13 state:R running task stack:0 pid:9366 tgid:9366 ppid:2 task_flags:0x4208060 flags:0x00000000 Workqueue: events bpf_prog_free_deferred Call trace: [<81a63614>] (__schedule) from [<81a649dc>] (preempt_schedule_irq+0x40/0xa8 kernel/sched/core.c:7256) r10:8280c9b4 r9:85e4c800 r8:80200c04 r7:e01f5d54 r6:ffffffff r5:85e4c800 r4:00000000 [<81a6499c>] (preempt_schedule_irq) from [<80200c24>] (svc_preempt+0x8/0x18) Exception stack(0xe01f5d20 to 0xe01f5d68) 5d20: 80d06000 eaaa7000 00000001 80239bf8 7f047000 00000001 82acb1c4 82aca5a0 5d40: 7f047000 eaaa7000 8280c9b4 e01f5d9c e01f5da0 e01f5d70 80230af0 80239c10 5d60: 800b0013 ffffffff r5:800b0013 r4:80239c10 [<80230a8c>] (flush_tlb_kernel_range) from [<804e9d20>] (__purge_vmap_area_lazy+0x284/0x458 mm/vmalloc.c:2342) r4:82acb1e4 [<804e9a9c>] (__purge_vmap_area_lazy) from [<804ea0d8>] (_vm_unmap_aliases+0x1e4/0x240 mm/vmalloc.c:2957) r10:00000000 r9:00000000 r8:00000000 r7:ffffffff r6:e01f5dc0 r5:e01f5e08 r4:e01f5dc0 [<804e9ef4>] (_vm_unmap_aliases) from [<804edd3c>] (vm_reset_perms mm/vmalloc.c:3349 [inline]) [<804e9ef4>] (_vm_unmap_aliases) from [<804edd3c>] (vfree+0x16c/0x210 mm/vmalloc.c:3428) r10:83016170 r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:85a2acc0 r4:00000000 [<804edbd0>] (vfree) from [<80558a28>] (execmem_free+0x30/0x50 mm/execmem.c:503) r9:83018405 r8:85e4c800 r7:00000000 r6:83018400 r5:00001000 r4:7f04b000 [<805589f8>] (execmem_free) from [<803c5f48>] (bpf_jit_free_exec+0x10/0x14 kernel/bpf/core.c:1052) r5:00001000 r4:dfc07000 [<803c5f38>] (bpf_jit_free_exec) from [<803c6328>] (bpf_jit_binary_free kernel/bpf/core.c:1098 [inline]) [<803c5f38>] (bpf_jit_free_exec) from [<803c6328>] (bpf_jit_free+0x68/0xe4 kernel/bpf/core.c:1221) [<803c62c0>] (bpf_jit_free) from [<803c73d0>] (bpf_prog_free_deferred+0x140/0x158 kernel/bpf/core.c:2898) r5:84da4b8c r4:8668b680 [<803c7290>] (bpf_prog_free_deferred) from [<802785a0>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3263) r7:dddcfd80 r6:83018400 r5:84da4b8c r4:8668b680 [<802783ec>] (process_one_work) from [<802791e8>] (process_scheduled_works kernel/workqueue.c:3346 [inline]) [<802783ec>] (process_one_work) from [<802791e8>] (worker_thread+0x1fc/0x3d8 kernel/workqueue.c:3427) r10:61c88647 r9:85e4c800 r8:8668b6ac r7:82804d40 r6:dddcfd80 r5:dddcfda0 r4:8668b680 [<80278fec>] (worker_thread) from [<8028020c>] (kthread+0x12c/0x280 kernel/kthread.c:463) r10:00000000 r9:8668b680 r8:80278fec r7:ea5a1e60 r6:8668b200 r5:85e4c800 r4:00000001 [<802800e0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xe01f5fb0 to 0xe01f5ff8) 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 r5:802800e0 r4:84c91f40 NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express Call trace: [<80201a24>] (dump_backtrace) from [<80201b20>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257) r7:00000000 r6:000f0013 r5:600f0093 r4:82252544 [<80201b08>] (show_stack) from [<8021f8b0>] (__dump_stack lib/dump_stack.c:94 [inline]) [<80201b08>] (show_stack) from [<8021f8b0>] (dump_stack_lvl+0x70/0x7c lib/dump_stack.c:120) [<8021f840>] (dump_stack_lvl) from [<8021f8d4>] (dump_stack+0x18/0x1c lib/dump_stack.c:129) r5:00000001 r4:00000001 [<8021f8bc>] (dump_stack) from [<81a4d22c>] (nmi_cpu_backtrace+0x160/0x17c lib/nmi_backtrace.c:113) [<81a4d0cc>] (nmi_cpu_backtrace) from [<81a4d378>] (nmi_trigger_cpumask_backtrace+0x130/0x1d8 lib/nmi_backtrace.c:62) r7:00000001 r6:8280c690 r5:8281ae34 r4:ffffffff [<81a4d248>] (nmi_trigger_cpumask_backtrace) from [<802304fc>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:852) r9:8281ba28 r8:8280c810 r7:000a7ce9 r6:00007e9b r5:82abf7d4 r4:833c390c [<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037fab0>] (trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]) [<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037fab0>] (check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline]) [<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037fab0>] (watchdog+0x5d0/0x850 kernel/hung_task.c:495) [<8037f4e0>] (watchdog) from [<8028020c>] (kthread+0x12c/0x280 kernel/kthread.c:463) r10:00000000 r9:00000000 r8:8037f4e0 r7:8332a300 r6:8332a300 r5:8321e000 r4:00000001 [<802800e0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xdf8d9fb0 to 0xdf8d9ff8) 9fa0: 00000000 00000000 00000000 00000000 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:802800e0 r4:832c0b80 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 2821 Comm: pr/ttyAMA-1 Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] PC is at _raw_spin_unlock_irqrestore+0x28/0x54 kernel/locking/spinlock.c:194 LR is at spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] LR is at __uart_port_unlock_irqrestore include/linux/serial_core.h:616 [inline] LR is at pl011_console_device_unlock+0x20/0x24 drivers/tty/serial/amba-pl011.c:2603 pc : [<81a6d47c>] lr : [<80a8f070>] psr: 600f0113 sp : eafddeb0 ip : eafddec0 fp : eafddebc r10: 82959554 r9 : 00000000 r8 : 00000000 r7 : 00000117 r6 : 829594b8 r5 : 00000000 r4 : 00000001 r3 : 00008a1b r2 : 00000000 r1 : 600f0113 r0 : 84b0e040 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85681840 DAC: fffffffd Call trace: [<81a6d454>] (_raw_spin_unlock_irqrestore) from [<80a8f070>] (spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]) [<81a6d454>] (_raw_spin_unlock_irqrestore) from [<80a8f070>] (__uart_port_unlock_irqrestore include/linux/serial_core.h:616 [inline]) [<81a6d454>] (_raw_spin_unlock_irqrestore) from [<80a8f070>] (pl011_console_device_unlock+0x20/0x24 drivers/tty/serial/amba-pl011.c:2603) [<80a8f050>] (pl011_console_device_unlock) from [<802e3768>] (nbcon_emit_one+0x88/0x100 kernel/printk/nbcon.c:1142) [<802e36e0>] (nbcon_emit_one) from [<802e3988>] (nbcon_kthread_func+0x1a8/0x2a4 kernel/printk/nbcon.c:1229) r6:8280c690 r5:83b2bc00 r4:829594b8 [<802e37e0>] (nbcon_kthread_func) from [<8028020c>] (kthread+0x12c/0x280 kernel/kthread.c:463) r10:00000000 r9:829594b8 r8:802e37e0 r7:84704e80 r6:84704e80 r5:83b2bc00 r4:00000001 [<802800e0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xeafddfb0 to 0xeafddff8) dfa0: 00000000 00000000 00000000 00000000 dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:802800e0 r4:84709a40