INFO: task kworker/0:9:5941 blocked for more than 430 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:9 state:D stack:0 pid:5941 tgid:5941 ppid:2 task_flags:0x4208060 flags:0x00000000 Workqueue: events bpf_prog_free_deferred Call trace: [<81a63b5c>] (__schedule) from [<81a64af0>] (__schedule_loop kernel/sched/core.c:7011 [inline]) [<81a63b5c>] (__schedule) from [<81a64af0>] (schedule+0x2c/0x130 kernel/sched/core.c:7026) r10:e0001d84 r9:00000002 r8:60000113 r7:829171a0 r6:e0001d8c r5:841d1800 r4:841d1800 [<81a64ac4>] (schedule) from [<81a64ed8>] (schedule_preempt_disabled+0x18/0x24 kernel/sched/core.c:7083) r5:841d1800 r4:8291719c [<81a64ec0>] (schedule_preempt_disabled) from [<81a67a88>] (__mutex_lock_common kernel/locking/mutex.c:676 [inline]) [<81a64ec0>] (schedule_preempt_disabled) from [<81a67a88>] (__mutex_lock.constprop.0+0x350/0xa24 kernel/locking/mutex.c:760) [<81a67738>] (__mutex_lock.constprop.0) from [<81a68230>] (__mutex_lock_slowpath+0x14/0x18 kernel/locking/mutex.c:1049) r10:8280c960 r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:e0001e08 r4:00000000 [<81a6821c>] (__mutex_lock_slowpath) from [<81a68270>] (mutex_lock+0x3c/0x40 kernel/locking/mutex.c:274) [<81a68234>] (mutex_lock) from [<804ea36c>] (_vm_unmap_aliases+0x68/0x240 mm/vmalloc.c:2918) [<804ea304>] (_vm_unmap_aliases) from [<804ee14c>] (vm_reset_perms mm/vmalloc.c:3349 [inline]) [<804ea304>] (_vm_unmap_aliases) from [<804ee14c>] (vfree+0x16c/0x210 mm/vmalloc.c:3428) r10:83016170 r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:86fda380 r4:00000000 [<804edfe0>] (vfree) from [<80559028>] (execmem_free+0x30/0x50 mm/execmem.c:503) r9:83018405 r8:841d1800 r7:00000000 r6:83018400 r5:00001000 r4:7f2a0000 [<80558ff8>] (execmem_free) from [<803c5fc8>] (bpf_jit_free_exec+0x10/0x14 kernel/bpf/core.c:1052) r5:00001000 r4:ea3eb000 [<803c5fb8>] (bpf_jit_free_exec) from [<803c63a8>] (bpf_jit_binary_free kernel/bpf/core.c:1098 [inline]) [<803c5fb8>] (bpf_jit_free_exec) from [<803c63a8>] (bpf_jit_free+0x68/0xe4 kernel/bpf/core.c:1221) [<803c6340>] (bpf_jit_free) from [<803c7450>] (bpf_prog_free_deferred+0x140/0x158 kernel/bpf/core.c:2898) r5:862b478c r4:84876700 [<803c7310>] (bpf_prog_free_deferred) from [<802785a0>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3263) r7:dddcfd80 r6:83018400 r5:862b478c r4:84876700 [<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 r9:841d1800 r8:8487672c r7:82804d40 r6:dddcfd80 r5:dddcfda0 r4:84876700 [<80278fec>] (worker_thread) from [<8028020c>] (kthread+0x12c/0x280 kernel/kthread.c:463) r10:00000000 r9:84876700 r8:80278fec r7:e0081e60 r6:84890800 r5:841d1800 r4:00000001 [<802800e0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xe0001fb0 to 0xe0001ff8) 1fa0: 00000000 00000000 00000000 00000000 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:802800e0 r4:85792940 INFO: task kworker/0:9:5941 is blocked on a mutex likely owned by task kworker/1:16:8873. task:kworker/1:16 state:R running task stack:0 pid:8873 tgid:8873 ppid:2 task_flags:0x4208060 flags:0x00000000 Workqueue: events bpf_prog_free_deferred Call trace: [<81a63b5c>] (__schedule) from [<81a64f24>] (preempt_schedule_irq+0x40/0xa8 kernel/sched/core.c:7256) r10:8280c9b4 r9:8633bc00 r8:80200c04 r7:e4231d54 r6:ffffffff r5:8633bc00 r4:00000000 [<81a64ee4>] (preempt_schedule_irq) from [<80200c24>] (svc_preempt+0x8/0x18) Exception stack(0xe4231d20 to 0xe4231d68) 1d20: ae38d000 eae3f000 00000001 80239bf8 7f230000 00000001 82acb1c4 82aca5a0 1d40: 7f230000 eae3f000 8280c9b4 e4231d9c e4231da0 e4231d70 80230af0 80239c10 1d60: 80000113 ffffffff r5:80000113 r4:80239c10 [<80230a8c>] (flush_tlb_kernel_range) from [<804ea130>] (__purge_vmap_area_lazy+0x284/0x458 mm/vmalloc.c:2342) r4:82acb1e4 [<804e9eac>] (__purge_vmap_area_lazy) from [<804ea4e8>] (_vm_unmap_aliases+0x1e4/0x240 mm/vmalloc.c:2957) r10:00000000 r9:00000000 r8:00000000 r7:ffffffff r6:e4231dc0 r5:e4231e08 r4:e4231dc0 [<804ea304>] (_vm_unmap_aliases) from [<804ee14c>] (vm_reset_perms mm/vmalloc.c:3349 [inline]) [<804ea304>] (_vm_unmap_aliases) from [<804ee14c>] (vfree+0x16c/0x210 mm/vmalloc.c:3428) r10:83016170 r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:8488eb80 r4:00000000 [<804edfe0>] (vfree) from [<80559028>] (execmem_free+0x30/0x50 mm/execmem.c:503) r9:83018605 r8:8633bc00 r7:00000000 r6:83018600 r5:00001000 r4:7f29e000 [<80558ff8>] (execmem_free) from [<803c5fc8>] (bpf_jit_free_exec+0x10/0x14 kernel/bpf/core.c:1052) r5:00001000 r4:ea38f000 [<803c5fb8>] (bpf_jit_free_exec) from [<803c63a8>] (bpf_jit_binary_free kernel/bpf/core.c:1098 [inline]) [<803c5fb8>] (bpf_jit_free_exec) from [<803c63a8>] (bpf_jit_free+0x68/0xe4 kernel/bpf/core.c:1221) [<803c6340>] (bpf_jit_free) from [<803c7450>] (bpf_prog_free_deferred+0x140/0x158 kernel/bpf/core.c:2898) r5:857aaf8c r4:860a9b80 [<803c7310>] (bpf_prog_free_deferred) from [<802785a0>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3263) r7:ddde3d80 r6:83018600 r5:857aaf8c r4:860a9b80 [<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 r9:8633bc00 r8:860a9bac r7:82804d40 r6:ddde3d80 r5:ddde3da0 r4:860a9b80 [<80278fec>] (worker_thread) from [<8028020c>] (kthread+0x12c/0x280 kernel/kthread.c:463) r10:00000000 r9:860a9b80 r8:80278fec r7:dfb49e60 r6:860a9c00 r5:8633bc00 r4:00000001 [<802800e0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xe4231fb0 to 0xe4231ff8) 1fa0: 00000000 00000000 00000000 00000000 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:802800e0 r4:854891c0 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 r6:00000013 r5:60000093 r4:822525ec [<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 [<81a4d774>] (nmi_cpu_backtrace+0x160/0x17c lib/nmi_backtrace.c:113) [<81a4d614>] (nmi_cpu_backtrace) from [<81a4d8c0>] (nmi_trigger_cpumask_backtrace+0x130/0x1d8 lib/nmi_backtrace.c:62) r7:00000001 r6:8280c690 r5:8281ae34 r4:ffffffff [<81a4d790>] (nmi_trigger_cpumask_backtrace) from [<802304fc>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:852) r9:8281ba28 r8:8280c810 r7:0002467b r6:00007e3f r5:82abf7d4 r4:868c5a0c [<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037fb20>] (trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]) [<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037fb20>] (check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline]) [<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037fb20>] (watchdog+0x5d0/0x850 kernel/hung_task.c:495) [<8037f550>] (watchdog) from [<8028020c>] (kthread+0x12c/0x280 kernel/kthread.c:463) r10:00000000 r9:00000000 r8:8037f550 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: 2820 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 : [<81a6d9c4>] lr : [<80a8f308>] psr: 60000113 sp : eaf55eb0 ip : eaf55ec0 fp : eaf55ebc r10: 82959594 r9 : 00000000 r8 : 00000000 r7 : 00000117 r6 : 829594f8 r5 : 00000000 r4 : 00000001 r3 : 00000c5d r2 : 00000000 r1 : 60000113 r0 : 84077440 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84938d40 DAC: fffffffd Call trace: [<81a6d99c>] (_raw_spin_unlock_irqrestore) from [<80a8f308>] (spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]) [<81a6d99c>] (_raw_spin_unlock_irqrestore) from [<80a8f308>] (__uart_port_unlock_irqrestore include/linux/serial_core.h:616 [inline]) [<81a6d99c>] (_raw_spin_unlock_irqrestore) from [<80a8f308>] (pl011_console_device_unlock+0x20/0x24 drivers/tty/serial/amba-pl011.c:2603) [<80a8f2e8>] (pl011_console_device_unlock) from [<802e3780>] (nbcon_emit_one+0x88/0x100 kernel/printk/nbcon.c:1142) [<802e36f8>] (nbcon_emit_one) from [<802e39a0>] (nbcon_kthread_func+0x1a8/0x2a4 kernel/printk/nbcon.c:1229) r6:8280c690 r5:841d6000 r4:829594f8 [<802e37f8>] (nbcon_kthread_func) from [<8028020c>] (kthread+0x12c/0x280 kernel/kthread.c:463) r10:00000000 r9:829594f8 r8:802e37f8 r7:84761700 r6:84761700 r5:841d6000 r4:00000001 [<802800e0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xeaf55fb0 to 0xeaf55ff8) 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 r4:8416bf00