INFO: task kworker/1:79:9739 blocked for more than 429 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:79 state:D stack:0 pid:9739 tgid:9739 ppid:2 task_flags:0x4208060 flags:0x00000000 Workqueue: events bpf_prog_free_deferred Call trace: [<81a39934>] (__schedule) from [<81a3a8c8>] (__schedule_loop kernel/sched/core.c:7011 [inline]) [<81a39934>] (__schedule) from [<81a3a8c8>] (schedule+0x2c/0x130 kernel/sched/core.c:7026) r10:dfe41d84 r9:00000002 r8:60000013 r7:82917120 r6:dfe41d8c r5:83f9ec00 r4:83f9ec00 [<81a3a89c>] (schedule) from [<81a3acb0>] (schedule_preempt_disabled+0x18/0x24 kernel/sched/core.c:7083) r5:83f9ec00 r4:8291711c [<81a3ac98>] (schedule_preempt_disabled) from [<81a3d860>] (__mutex_lock_common kernel/locking/mutex.c:676 [inline]) [<81a3ac98>] (schedule_preempt_disabled) from [<81a3d860>] (__mutex_lock.constprop.0+0x350/0xa24 kernel/locking/mutex.c:760) [<81a3d510>] (__mutex_lock.constprop.0) from [<81a3e008>] (__mutex_lock_slowpath+0x14/0x18 kernel/locking/mutex.c:1049) r10:8280c960 r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:dfe41e08 r4:00000000 [<81a3dff4>] (__mutex_lock_slowpath) from [<81a3e048>] (mutex_lock+0x3c/0x40 kernel/locking/mutex.c:274) [<81a3e00c>] (mutex_lock) from [<804e9758>] (_vm_unmap_aliases+0x68/0x240 mm/vmalloc.c:2918) [<804e96f0>] (_vm_unmap_aliases) from [<804ed538>] (vm_reset_perms mm/vmalloc.c:3349 [inline]) [<804e96f0>] (_vm_unmap_aliases) from [<804ed538>] (vfree+0x16c/0x210 mm/vmalloc.c:3428) r10:83016170 r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:85a108c0 r4:00000000 [<804ed3cc>] (vfree) from [<80558138>] (execmem_free+0x30/0x50 mm/execmem.c:503) r9:83018605 r8:83f9ec00 r7:00000000 r6:83018600 r5:00001000 r4:7f007000 [<80558108>] (execmem_free) from [<803c5740>] (bpf_jit_free_exec+0x10/0x14 kernel/bpf/core.c:1052) r5:00001000 r4:e05e3000 [<803c5730>] (bpf_jit_free_exec) from [<803c5b20>] (bpf_jit_binary_free kernel/bpf/core.c:1098 [inline]) [<803c5730>] (bpf_jit_free_exec) from [<803c5b20>] (bpf_jit_free+0x68/0xe4 kernel/bpf/core.c:1221) [<803c5ab8>] (bpf_jit_free) from [<803c6bc8>] (bpf_prog_free_deferred+0x140/0x158 kernel/bpf/core.c:2898) r5:8628ef8c r4:85e18a00 [<803c6a88>] (bpf_prog_free_deferred) from [<80278594>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3263) r7:ddde3d80 r6:83018600 r5:8628ef8c r4:85e18a00 [<802783e0>] (process_one_work) from [<802791dc>] (process_scheduled_works kernel/workqueue.c:3346 [inline]) [<802783e0>] (process_one_work) from [<802791dc>] (worker_thread+0x1fc/0x3d8 kernel/workqueue.c:3427) r10:61c88647 r9:83f9ec00 r8:85e18a2c r7:82804d40 r6:ddde3d80 r5:ddde3da0 r4:85e18a00 [<80278fe0>] (worker_thread) from [<80280200>] (kthread+0x12c/0x280 kernel/kthread.c:463) r10:00000000 r9:85e18a00 r8:80278fe0 r7:dfb25e60 r6:857e4600 r5:83f9ec00 r4:00000001 [<802800d4>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xdfe41fb0 to 0xdfe41ff8) 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 r5:802800d4 r4:84cecfc0 INFO: task kworker/1:79:9739 is blocked on a mutex likely owned by task kworker/0:48:8473. task:kworker/0:48 state:R running task stack:0 pid:8473 tgid:8473 ppid:2 task_flags:0x4208060 flags:0x00000000 Workqueue: events bpf_prog_free_deferred Call trace: [<81a39934>] (__schedule) from [<81a3acfc>] (preempt_schedule_irq+0x40/0xa8 kernel/sched/core.c:7256) r10:8280c9b4 r9:8b603c00 r8:80200c04 r7:e8731d54 r6:ffffffff r5:8b603c00 r4:00000000 [<81a3acbc>] (preempt_schedule_irq) from [<80200c24>] (svc_preempt+0x8/0x18) Exception stack(0xe8731d20 to 0xe8731d68) 1d20: e4433000 ea8ef000 00000001 80239bf8 df99c000 00000001 82aca1c4 82ac95a0 1d40: df99c000 ea8ef000 8280c9b4 e8731d9c e8731da0 e8731d70 80230af0 80239c10 1d60: 800f0113 ffffffff r5:800f0113 r4:80239c10 [<80230a8c>] (flush_tlb_kernel_range) from [<804e951c>] (__purge_vmap_area_lazy+0x284/0x458 mm/vmalloc.c:2342) r4:82aca1e4 [<804e9298>] (__purge_vmap_area_lazy) from [<804e98d4>] (_vm_unmap_aliases+0x1e4/0x240 mm/vmalloc.c:2957) r10:00000000 r9:00000000 r8:00000000 r7:ffffffff r6:e8731dc0 r5:e8731e08 r4:e8731dc0 [<804e96f0>] (_vm_unmap_aliases) from [<804ed538>] (vm_reset_perms mm/vmalloc.c:3349 [inline]) [<804e96f0>] (_vm_unmap_aliases) from [<804ed538>] (vfree+0x16c/0x210 mm/vmalloc.c:3428) r10:83016170 r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:85e0a980 r4:00000000 [<804ed3cc>] (vfree) from [<80558138>] (execmem_free+0x30/0x50 mm/execmem.c:503) r9:83018405 r8:8b603c00 r7:00000000 r6:83018400 r5:00001000 r4:7f009000 [<80558108>] (execmem_free) from [<803c5740>] (bpf_jit_free_exec+0x10/0x14 kernel/bpf/core.c:1052) r5:00001000 r4:e05fd000 [<803c5730>] (bpf_jit_free_exec) from [<803c5b20>] (bpf_jit_binary_free kernel/bpf/core.c:1098 [inline]) [<803c5730>] (bpf_jit_free_exec) from [<803c5b20>] (bpf_jit_free+0x68/0xe4 kernel/bpf/core.c:1221) [<803c5ab8>] (bpf_jit_free) from [<803c6bc8>] (bpf_prog_free_deferred+0x140/0x158 kernel/bpf/core.c:2898) r5:8628eb8c r4:861dce00 [<803c6a88>] (bpf_prog_free_deferred) from [<80278594>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3263) r7:dddcfd80 r6:83018400 r5:8628eb8c r4:861dce00 [<802783e0>] (process_one_work) from [<802791dc>] (process_scheduled_works kernel/workqueue.c:3346 [inline]) [<802783e0>] (process_one_work) from [<802791dc>] (worker_thread+0x1fc/0x3d8 kernel/workqueue.c:3427) r10:61c88647 r9:8b603c00 r8:861dce2c r7:82804d40 r6:dddcfd80 r5:dddcfda0 r4:861dce00 [<80278fe0>] (worker_thread) from [<80280200>] (kthread+0x12c/0x280 kernel/kthread.c:463) r10:00000000 r9:861dce00 r8:80278fe0 r7:dfaa9e60 r6:861dc200 r5:8b603c00 r4:00000001 [<802800d4>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xe8731fb0 to 0xe8731ff8) 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 r5:802800d4 r4:8b5d26c0 NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 32 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 r6:00000113 r5:60000193 r4:8224e074 [<80201b08>] (show_stack) from [<8021f924>] (__dump_stack lib/dump_stack.c:94 [inline]) [<80201b08>] (show_stack) from [<8021f924>] (dump_stack_lvl+0x70/0x7c lib/dump_stack.c:120) [<8021f8b4>] (dump_stack_lvl) from [<8021f948>] (dump_stack+0x18/0x1c lib/dump_stack.c:129) r5:00000001 r4:00000001 [<8021f930>] (dump_stack) from [<81a2354c>] (nmi_cpu_backtrace+0x160/0x17c lib/nmi_backtrace.c:113) [<81a233ec>] (nmi_cpu_backtrace) from [<81a23698>] (nmi_trigger_cpumask_backtrace+0x130/0x1d8 lib/nmi_backtrace.c:62) r7:00000001 r6:8280c690 r5:8281ae00 r4:ffffffff [<81a23568>] (nmi_trigger_cpumask_backtrace) from [<802304fc>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:852) r9:8281b9e8 r8:8280c810 r7:0002f7c3 r6:00007f14 r5:82abe7d4 r4:85e5510c [<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037f2b4>] (trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]) [<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037f2b4>] (check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline]) [<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037f2b4>] (watchdog+0x5d0/0x850 kernel/hung_task.c:495) [<8037ece4>] (watchdog) from [<80280200>] (kthread+0x12c/0x280 kernel/kthread.c:463) r10:00000000 r9:00000000 r8:8037ece4 r7:8334a780 r6:8334a780 r5:83399800 r4:00000001 [<802800d4>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xdf8e1fb0 to 0xdf8e1ff8) 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 r5:802800d4 r4:83348f00 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 2822 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 : [<81a438fc>] lr : [<80a8dbc8>] psr: 600f0113 sp : eb80deb0 ip : eb80dec0 fp : eb80debc r10: 829594d4 r9 : 00000000 r8 : 00000000 r7 : 00000117 r6 : 82959438 r5 : 00000000 r4 : 00000001 r3 : 00001245 r2 : 00000000 r1 : 600f0113 r0 : 84787440 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8482a940 DAC: fffffffd Call trace: [<81a438d4>] (_raw_spin_unlock_irqrestore) from [<80a8dbc8>] (spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]) [<81a438d4>] (_raw_spin_unlock_irqrestore) from [<80a8dbc8>] (__uart_port_unlock_irqrestore include/linux/serial_core.h:616 [inline]) [<81a438d4>] (_raw_spin_unlock_irqrestore) from [<80a8dbc8>] (pl011_console_device_unlock+0x20/0x24 drivers/tty/serial/amba-pl011.c:2603) [<80a8dba8>] (pl011_console_device_unlock) from [<802e3090>] (nbcon_emit_one+0x88/0x100 kernel/printk/nbcon.c:1142) [<802e3008>] (nbcon_emit_one) from [<802e32b0>] (nbcon_kthread_func+0x1a8/0x2a4 kernel/printk/nbcon.c:1229) r6:8280c690 r5:83b40c00 r4:82959438 [<802e3108>] (nbcon_kthread_func) from [<80280200>] (kthread+0x12c/0x280 kernel/kthread.c:463) r10:00000000 r9:82959438 r8:802e3108 r7:84829a00 r6:84829a00 r5:83b40c00 r4:00000001 [<802800d4>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xeb80dfb0 to 0xeb80dff8) 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 r5:802800d4 r4:838aca80