INFO: task kworker/0:19:11386 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/0:19 state:D stack:0 pid:11386 tgid:11386 ppid:2 task_flags:0x4208060 flags:0x00000000 Workqueue: events bpf_prog_free_deferred Call trace: [<81c0e194>] (__schedule) from [<81c0f6a4>] (__schedule_loop kernel/sched/core.c:7459 [inline]) [<81c0e194>] (__schedule) from [<81c0f6a4>] (schedule+0x2c/0xec kernel/sched/core.c:7474) r10:dfac9d84 r9:dfac9d8c r8:00000002 r7:60000013 r6:836dd000 r5:85b57080 r4:85b57080 [<81c0f678>] (schedule) from [<81c0f7e8>] (schedule_preempt_disabled+0x18/0x24 kernel/sched/core.c:7531) r5:85b57080 r4:836dcffc [<81c0f7d0>] (schedule_preempt_disabled) from [<81c12024>] (__mutex_lock_common kernel/locking/mutex.c:726 [inline]) [<81c0f7d0>] (schedule_preempt_disabled) from [<81c12024>] (__mutex_lock.constprop.0+0x50c/0xa58 kernel/locking/mutex.c:821) [<81c11b18>] (__mutex_lock.constprop.0) from [<81c12644>] (__mutex_lock_slowpath+0x14/0x18 kernel/locking/mutex.c:1164) r10:8340b48c r9:00800000 r8:00000000 r7:ffffffff r6:00000000 r5:dfac9e08 r4:86ef8000 [<81c12630>] (__mutex_lock_slowpath) from [<81c12684>] (mutex_lock+0x3c/0x40 kernel/locking/mutex.c:319) [<81c12648>] (mutex_lock) from [<8054c8e4>] (_vm_unmap_aliases+0x5c/0x238 mm/vmalloc.c:3006) [<8054c888>] (_vm_unmap_aliases) from [<80550954>] (vm_reset_perms mm/vmalloc.c:3441 [inline]) [<8054c888>] (_vm_unmap_aliases) from [<80550954>] (vfree+0x110/0x17c mm/vmalloc.c:3545) r10:83c2b005 r9:00800000 r8:ffffffff r7:00000001 r6:00000000 r5:00000000 r4:86ef8000 [<80550844>] (vfree) from [<805cf294>] (execmem_free+0x34/0x54 mm/execmem.c:501) r8:00000000 r7:00000000 r6:83dacba0 r5:00001000 r4:7f031000 [<805cf260>] (execmem_free) from [<803e7908>] (bpf_jit_free_exec kernel/bpf/core.c:1137 [inline]) [<805cf260>] (execmem_free) from [<803e7908>] (bpf_jit_binary_free kernel/bpf/core.c:1183 [inline]) [<805cf260>] (execmem_free) from [<803e7908>] (bpf_jit_free+0x38/0xb4 kernel/bpf/core.c:1307) r5:00001000 r4:eaee7000 [<803e78d0>] (bpf_jit_free) from [<803e79f8>] (bpf_prog_free_images+0x74/0x78 kernel/bpf/core.c:3161) r5:83dacba0 r4:85da0000 [<803e7984>] (bpf_prog_free_images) from [<803e8cac>] (bpf_prog_free_deferred+0x198/0x1bc kernel/bpf/core.c:3200) r7:00000000 r6:83dacba0 r5:83dac800 r4:85da0000 [<803e8b14>] (bpf_prog_free_deferred) from [<80279aac>] (process_one_work+0x1f8/0x5cc kernel/workqueue.c:3495) r9:00800000 r8:85b57080 r7:dddd1640 r6:83c2b000 r5:83dacba0 r4:85da0000 [<802798b4>] (process_one_work) from [<8027aa58>] (process_scheduled_works kernel/workqueue.c:3578 [inline]) [<802798b4>] (process_one_work) from [<8027aa58>] (worker_thread+0x16c/0x318 kernel/workqueue.c:3659) r10:dddd1640 r9:85da0030 r8:85b57080 r7:83403d80 r6:dddd1660 r5:dddd1640 r4:85da0000 [<8027a8ec>] (worker_thread) from [<802856a0>] (kthread+0x11c/0x154 kernel/kthread.c:436) r10:00000000 r9:dfa91e88 r8:85f22e80 r7:85da0000 r6:8027a8ec r5:85b57080 r4:873f6a00 [<80285584>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xdfac9fb0 to 0xdfac9ff8) 9fa0: 00000000 00000000 00000000 00000000 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80285584 r4:873f6a00 INFO: task kworker/0:19:11386 is blocked on a mutex likely owned by task kworker/0:2:12855. task:kworker/0:2 state:R running task stack:0 pid:12855 tgid:12855 ppid:2 task_flags:0x4208060 flags:0x00000000 Workqueue: events bpf_prog_free_deferred Call trace: [<81c0e194>] (__schedule) from [<81c0fa94>] (preempt_schedule_irq+0x40/0xa8 kernel/sched/core.c:7662) r10:8340b4e0 r9:85b8a580 r8:80200c04 r7:e020dd5c r6:ffffffff r5:85b8a580 r4:00000000 [<81c0fa54>] (preempt_schedule_irq) from [<80200c24>] (svc_preempt+0x8/0x18) Exception stack(0xe020dd28 to 0xe020dd70) dd20: b3f3b000 eafb5000 00000000 8023a8ac 836dc394 836dcfd8 dd40: 7f262000 eafb5000 00000000 00000001 8340b4e0 e020dd9c eafb5000 e020dd78 dd60: 802316dc 8023a8c4 800e0013 ffffffff r5:800e0013 r4:8023a8c4 [<8023167c>] (flush_tlb_kernel_range) from [<8054c698>] (__purge_vmap_area_lazy+0x28c/0x47c mm/vmalloc.c:2404) [<8054c40c>] (__purge_vmap_area_lazy) from [<8054ca70>] (_vm_unmap_aliases+0x1e8/0x238 mm/vmalloc.c:3045) r10:00000000 r9:e020ddc0 r8:00000000 r7:ffffffff r6:00000008 r5:e020de08 r4:e020ddc0 [<8054c888>] (_vm_unmap_aliases) from [<80550954>] (vm_reset_perms mm/vmalloc.c:3441 [inline]) [<8054c888>] (_vm_unmap_aliases) from [<80550954>] (vfree+0x110/0x17c mm/vmalloc.c:3545) r10:83c2b005 r9:00800000 r8:ffffffff r7:00000001 r6:00000000 r5:00000000 r4:870cea00 [<80550844>] (vfree) from [<805cf294>] (execmem_free+0x34/0x54 mm/execmem.c:501) r8:00000000 r7:00000000 r6:85c88fa0 r5:00001000 r4:7f033000 [<805cf260>] (execmem_free) from [<803e7908>] (bpf_jit_free_exec kernel/bpf/core.c:1137 [inline]) [<805cf260>] (execmem_free) from [<803e7908>] (bpf_jit_binary_free kernel/bpf/core.c:1183 [inline]) [<805cf260>] (execmem_free) from [<803e7908>] (bpf_jit_free+0x38/0xb4 kernel/bpf/core.c:1307) r5:00001000 r4:eaee9000 [<803e78d0>] (bpf_jit_free) from [<803e79f8>] (bpf_prog_free_images+0x74/0x78 kernel/bpf/core.c:3161) r5:85c88fa0 r4:873e3700 [<803e7984>] (bpf_prog_free_images) from [<803e8cac>] (bpf_prog_free_deferred+0x198/0x1bc kernel/bpf/core.c:3200) r7:00000000 r6:85c88fa0 r5:85c88c00 r4:873e3700 [<803e8b14>] (bpf_prog_free_deferred) from [<80279aac>] (process_one_work+0x1f8/0x5cc kernel/workqueue.c:3495) r9:00800000 r8:85b8a580 r7:dddd1640 r6:83c2b000 r5:85c88fa0 r4:873e3700 [<802798b4>] (process_one_work) from [<8027aa58>] (process_scheduled_works kernel/workqueue.c:3578 [inline]) [<802798b4>] (process_one_work) from [<8027aa58>] (worker_thread+0x16c/0x318 kernel/workqueue.c:3659) r10:00000000 r9:873e3730 r8:85b8a580 r7:83403d80 r6:dddd1660 r5:dddd1640 r4:873e3700 [<8027a8ec>] (worker_thread) from [<802856a0>] (kthread+0x11c/0x154 kernel/kthread.c:436) r10:00000000 r9:ea621e88 r8:86a73480 r7:873e3700 r6:8027a8ec r5:85b8a580 r4:87fcbe80 [<80285584>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xe020dfb0 to 0xe020dff8) dfa0: 00000000 00000000 00000000 00000000 dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80285584 r4:87fcbe80 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 r5:825423e4 r4:00000000 [<80201ae4>] (show_stack) from [<8021f6e4>] (__dump_stack lib/dump_stack.c:94 [inline]) [<80201ae4>] (show_stack) from [<8021f6e4>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120) [<8021f688>] (dump_stack_lvl) from [<8021f710>] (dump_stack+0x18/0x1c lib/dump_stack.c:129) r7:00000000 r6:00000013 r5:00000000 r4:00000001 [<8021f6f8>] (dump_stack) from [<81bfa1d4>] (nmi_cpu_backtrace+0x150/0x170 lib/nmi_backtrace.c:123) [<81bfa084>] (nmi_cpu_backtrace) from [<81bfa328>] (nmi_trigger_cpumask_backtrace+0x134/0x208 lib/nmi_backtrace.c:66) r7:8340b194 r6:83d88000 r5:83417d78 r4:ffffffff [<81bfa1f4>] (nmi_trigger_cpumask_backtrace) from [<80231100>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:840) r9:8340b33c r8:00000048 r7:0000000a r6:83403d80 r5:00007ed4 r4:00000048 [<802310e8>] (arch_trigger_cpumask_backtrace) from [<81bfa080>] (cpumask_backtrace+0x10/0x14 lib/nmi_backtrace.c:136) [<81bfa070>] (cpumask_backtrace) from [<81bff278>] (trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]) [<81bfa070>] (cpumask_backtrace) from [<81bff278>] (__sys_info lib/sys_info.c:157 [inline]) [<81bfa070>] (cpumask_backtrace) from [<81bff278>] (sys_info+0x68/0xa8 lib/sys_info.c:165) [<81bff210>] (sys_info) from [<8039916c>] (check_hung_uninterruptible_tasks kernel/hung_task.c:377 [inline]) [<81bff210>] (sys_info) from [<8039916c>] (watchdog+0x418/0x8f4 kernel/hung_task.c:598) r5:00007ed4 r4:00000001 [<80398d54>] (watchdog) from [<802856a0>] (kthread+0x11c/0x154 kernel/kthread.c:436) r10:00000000 r9:df819e60 r8:83de9780 r7:00000000 r6:80398d54 r5:83d88000 r4:844cfb00 [<80285584>] (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 r5:80285584 r4:844cfb00