INFO: task kworker/0:22:17070 blocked for more than 430 seconds. Tainted: G L syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:22 state:D stack:0 pid:17070 tgid:17070 ppid:2 task_flags:0x4208060 flags:0x00000000 Workqueue: events bpf_prog_free_deferred Call trace: [<81bb481c>] (__schedule) from [<81bb5cb4>] (__schedule_loop kernel/sched/core.c:7361 [inline]) [<81bb481c>] (__schedule) from [<81bb5cb4>] (schedule+0x2c/0xec kernel/sched/core.c:7376) r10:ea481dac r9:ea481db4 r8:00000002 r7:600f0113 r6:834d804c r5:8398a580 r4:8398a580 [<81bb5c88>] (schedule) from [<81bb5df8>] (schedule_preempt_disabled+0x18/0x24 kernel/sched/core.c:7433) r5:8398a580 r4:834d8048 [<81bb5de0>] (schedule_preempt_disabled) from [<81bb8f74>] (__mutex_lock_common kernel/locking/mutex.c:726 [inline]) [<81bb5de0>] (schedule_preempt_disabled) from [<81bb8f74>] (__mutex_lock.constprop.0+0x50c/0xa48 kernel/locking/mutex.c:821) [<81bb8a68>] (__mutex_lock.constprop.0) from [<81bb9584>] (__mutex_lock_slowpath+0x14/0x18 kernel/locking/mutex.c:1164) r10:8320b484 r9:00800000 r8:00000000 r7:ffffffff r6:00000000 r5:ea481e30 r4:8783a480 [<81bb9570>] (__mutex_lock_slowpath) from [<81bb95c4>] (mutex_lock+0x3c/0x40 kernel/locking/mutex.c:319) [<81bb9588>] (mutex_lock) from [<80531930>] (_vm_unmap_aliases+0x5c/0x238 mm/vmalloc.c:2973) [<805318d4>] (_vm_unmap_aliases) from [<805357f8>] (vm_reset_perms mm/vmalloc.c:3404 [inline]) [<805318d4>] (_vm_unmap_aliases) from [<805357f8>] (vfree+0x110/0x17c mm/vmalloc.c:3508) r10:8382b005 r9:00800000 r8:ffffffff r7:00000001 r6:00000000 r5:00000000 r4:8783a480 [<805356e8>] (vfree) from [<805b0064>] (execmem_free+0x34/0x54 mm/execmem.c:507) r8:8398a580 r7:00000000 r6:8382b000 r5:00001000 r4:7f310000 [<805b0030>] (execmem_free) from [<803e207c>] (bpf_jit_free_exec kernel/bpf/core.c:1134 [inline]) [<805b0030>] (execmem_free) from [<803e207c>] (bpf_jit_binary_free kernel/bpf/core.c:1180 [inline]) [<805b0030>] (execmem_free) from [<803e207c>] (bpf_jit_free+0x64/0xe0 kernel/bpf/core.c:1304) r5:00001000 r4:dfba1000 [<803e2018>] (bpf_jit_free) from [<803e31e8>] (bpf_prog_free_deferred+0x148/0x160 kernel/bpf/core.c:3113) r5:8724fb98 r4:8724fb98 [<803e30a0>] (bpf_prog_free_deferred) from [<802771e0>] (process_one_work+0x1f8/0x5cc kernel/workqueue.c:3396) r7:dddd1180 r6:8382b000 r5:8724fb98 r4:871e5d00 [<80276fe8>] (process_one_work) from [<80277f08>] (process_scheduled_works kernel/workqueue.c:3479 [inline]) [<80276fe8>] (process_one_work) from [<80277f08>] (worker_thread+0x16c/0x318 kernel/workqueue.c:3560) r10:dddd1180 r9:871e5d30 r8:8398a580 r7:83203d80 r6:dddd11a0 r5:dddd1180 r4:871e5d00 [<80277d9c>] (worker_thread) from [<80282950>] (kthread+0x11c/0x154 kernel/kthread.c:436) r10:00000000 r9:ea3cde88 r8:87839480 r7:871e5d00 r6:80277d9c r5:8398a580 r4:86e24e00 [<80282834>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xea481fb0 to 0xea481ff8) 1fa0: 00000000 00000000 00000000 00000000 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80282834 r4:86e24e00 INFO: task kworker/0:22:17070 is blocked on a mutex likely owned by task kworker/0:27:19574. task:kworker/0:27 state:R running task stack:0 pid:19574 tgid:19574 ppid:2 task_flags:0x4208060 flags:0x00000000 Workqueue: events bpf_prog_free_deferred Call trace: [<81bb481c>] (__schedule) from [<81bb60a4>] (preempt_schedule_irq+0x40/0xa8 kernel/sched/core.c:7606) r10:8320b4d8 r9:8399d780 r8:80200c04 r7:ea7e1d84 r6:ffffffff r5:8399d780 r4:00000000 [<81bb6064>] (preempt_schedule_irq) from [<80200c24>] (svc_preempt+0x8/0x18) Exception stack(0xea7e1d50 to 0xea7e1d98) 1d40: 8e765000 ead97000 00000000 802397d0 1d60: 834d73e0 834d8024 7f302000 ead97000 00000000 00000001 8320b4d8 ea7e1dc4 1d80: ead97000 ea7e1da0 802306a4 802397e8 800d0113 ffffffff r5:800d0113 r4:802397e8 [<80230644>] (flush_tlb_kernel_range) from [<805316e4>] (__purge_vmap_area_lazy+0x28c/0x47c mm/vmalloc.c:2398) [<80531458>] (__purge_vmap_area_lazy) from [<80531abc>] (_vm_unmap_aliases+0x1e8/0x238 mm/vmalloc.c:3012) r10:00000000 r9:ea7e1de8 r8:00000000 r7:ffffffff r6:00000008 r5:ea7e1e30 r4:ea7e1de8 [<805318d4>] (_vm_unmap_aliases) from [<805357f8>] (vm_reset_perms mm/vmalloc.c:3404 [inline]) [<805318d4>] (_vm_unmap_aliases) from [<805357f8>] (vfree+0x110/0x17c mm/vmalloc.c:3508) r10:8382b005 r9:00800000 r8:ffffffff r7:00000001 r6:00000000 r5:00000000 r4:87fc8f40 [<805356e8>] (vfree) from [<805b0064>] (execmem_free+0x34/0x54 mm/execmem.c:507) r8:8399d780 r7:00000000 r6:8382b000 r5:00001000 r4:7f302000 [<805b0030>] (execmem_free) from [<803e207c>] (bpf_jit_free_exec kernel/bpf/core.c:1134 [inline]) [<805b0030>] (execmem_free) from [<803e207c>] (bpf_jit_binary_free kernel/bpf/core.c:1180 [inline]) [<805b0030>] (execmem_free) from [<803e207c>] (bpf_jit_free+0x64/0xe0 kernel/bpf/core.c:1304) r5:00001000 r4:dfa95000 [<803e2018>] (bpf_jit_free) from [<803e31e8>] (bpf_prog_free_deferred+0x148/0x160 kernel/bpf/core.c:3113) r5:87634798 r4:87634798 [<803e30a0>] (bpf_prog_free_deferred) from [<802771e0>] (process_one_work+0x1f8/0x5cc kernel/workqueue.c:3396) r7:dddd1180 r6:8382b000 r5:87634798 r4:863ef400 [<80276fe8>] (process_one_work) from [<80277f08>] (process_scheduled_works kernel/workqueue.c:3479 [inline]) [<80276fe8>] (process_one_work) from [<80277f08>] (worker_thread+0x16c/0x318 kernel/workqueue.c:3560) r10:00000000 r9:863ef430 r8:8399d780 r7:83203d80 r6:dddd11a0 r5:dddd1180 r4:863ef400 [<80277d9c>] (worker_thread) from [<80282950>] (kthread+0x11c/0x154 kernel/kthread.c:436) r10:00000000 r9:dfb4de88 r8:8725b400 r7:863ef400 r6:80277d9c r5:8399d780 r4:862e25c0 [<80282834>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xea7e1fb0 to 0xea7e1ff8) 1fa0: 00000000 00000000 00000000 00000000 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80282834 r4:862e25c0 NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 29 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: ARM-Versatile Express Call trace: [<80201a08>] (dump_backtrace) from [<80201afc>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257) r7:60000093 r6:60000093 r5:823283d8 r4:00000000 [<80201ae4>] (show_stack) from [<8021e804>] (__dump_stack lib/dump_stack.c:94 [inline]) [<80201ae4>] (show_stack) from [<8021e804>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120) [<8021e7a8>] (dump_stack_lvl) from [<8021e830>] (dump_stack+0x18/0x1c lib/dump_stack.c:129) r7:00000000 r6:00000013 r5:00000000 r4:00000001 [<8021e818>] (dump_stack) from [<81b9de44>] (nmi_cpu_backtrace+0x150/0x170 lib/nmi_backtrace.c:123) [<81b9dcf4>] (nmi_cpu_backtrace) from [<81b9df98>] (nmi_trigger_cpumask_backtrace+0x134/0x208 lib/nmi_backtrace.c:66) r7:8320b194 r6:83988000 r5:83217cb8 r4:ffffffff [<81b9de64>] (nmi_trigger_cpumask_backtrace) from [<802300c8>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:851) r9:8320b330 r8:00000048 r7:0000000a r6:83203d80 r5:00007eec r4:00000048 [<802300b0>] (arch_trigger_cpumask_backtrace) from [<81b9dcf0>] (cpumask_backtrace+0x10/0x14 lib/nmi_backtrace.c:136) [<81b9dce0>] (cpumask_backtrace) from [<81ba5ad8>] (trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]) [<81b9dce0>] (cpumask_backtrace) from [<81ba5ad8>] (__sys_info lib/sys_info.c:157 [inline]) [<81b9dce0>] (cpumask_backtrace) from [<81ba5ad8>] (sys_info+0x68/0xa8 lib/sys_info.c:165) [<81ba5a70>] (sys_info) from [<80393ff8>] (check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]) [<81ba5a70>] (sys_info) from [<80393ff8>] (watchdog+0x3ac/0x850 kernel/hung_task.c:561) r5:00007eec r4:00000001 [<80393c4c>] (watchdog) from [<80282950>] (kthread+0x11c/0x154 kernel/kthread.c:436) r10:00000000 r9:df819e60 r8:83924880 r7:00000000 r6:80393c4c r5:83988000 r4:840cef40 [<80282834>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xdf8d5fb0 to 0xdf8d5ff8) 5fa0: 00000000 00000000 00000000 00000000 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80282834 r4:840cef40