INFO: task kworker/0:22:13234 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:13234 tgid:13234 ppid:2 task_flags:0x4208060 flags:0x00000000 Workqueue: events bpf_prog_free_deferred Call trace: [<81baf6fc>] (__schedule) from [<81bb0b94>] (__schedule_loop kernel/sched/core.c:7361 [inline]) [<81baf6fc>] (__schedule) from [<81bb0b94>] (schedule+0x2c/0xec kernel/sched/core.c:7376) r10:e03d5dac r9:e03d5db4 r8:00000002 r7:600f0013 r6:82cd70cc r5:86780000 r4:86780000 [<81bb0b68>] (schedule) from [<81bb0cd8>] (schedule_preempt_disabled+0x18/0x24 kernel/sched/core.c:7433) r5:86780000 r4:82cd70c8 [<81bb0cc0>] (schedule_preempt_disabled) from [<81bb3e54>] (__mutex_lock_common kernel/locking/mutex.c:726 [inline]) [<81bb0cc0>] (schedule_preempt_disabled) from [<81bb3e54>] (__mutex_lock.constprop.0+0x50c/0xa48 kernel/locking/mutex.c:821) [<81bb3948>] (__mutex_lock.constprop.0) from [<81bb4464>] (__mutex_lock_slowpath+0x14/0x18 kernel/locking/mutex.c:1164) r10:82a0b484 r9:00800000 r8:00000000 r7:ffffffff r6:00000000 r5:e03d5e30 r4:93231840 [<81bb4450>] (__mutex_lock_slowpath) from [<81bb44a4>] (mutex_lock+0x3c/0x40 kernel/locking/mutex.c:319) [<81bb4468>] (mutex_lock) from [<8052f604>] (_vm_unmap_aliases+0x5c/0x238 mm/vmalloc.c:2973) [<8052f5a8>] (_vm_unmap_aliases) from [<805334cc>] (vm_reset_perms mm/vmalloc.c:3404 [inline]) [<8052f5a8>] (_vm_unmap_aliases) from [<805334cc>] (vfree+0x110/0x17c mm/vmalloc.c:3508) r10:8302b005 r9:00800000 r8:ffffffff r7:00000001 r6:00000000 r5:00000000 r4:93231840 [<805333bc>] (vfree) from [<805adcbc>] (execmem_free+0x34/0x54 mm/execmem.c:507) r8:86780000 r7:00000000 r6:8302b000 r5:00001000 r4:7f031000 [<805adc88>] (execmem_free) from [<803e209c>] (bpf_jit_free_exec kernel/bpf/core.c:1134 [inline]) [<805adc88>] (execmem_free) from [<803e209c>] (bpf_jit_binary_free kernel/bpf/core.c:1180 [inline]) [<805adc88>] (execmem_free) from [<803e209c>] (bpf_jit_free+0x64/0xe0 kernel/bpf/core.c:1304) r5:00001000 r4:dfcc1000 [<803e2038>] (bpf_jit_free) from [<803e3208>] (bpf_prog_free_deferred+0x148/0x160 kernel/bpf/core.c:3113) r5:87124398 r4:87124398 [<803e30c0>] (bpf_prog_free_deferred) from [<8027714c>] (process_one_work+0x1f8/0x5cc kernel/workqueue.c:3396) r7:dddd1180 r6:8302b000 r5:87124398 r4:85edb100 [<80276f54>] (process_one_work) from [<80277e74>] (process_scheduled_works kernel/workqueue.c:3479 [inline]) [<80276f54>] (process_one_work) from [<80277e74>] (worker_thread+0x16c/0x318 kernel/workqueue.c:3560) r10:dddd1180 r9:85edb130 r8:86780000 r7:82a03d80 r6:dddd11a0 r5:dddd1180 r4:85edb100 [<80277d08>] (worker_thread) from [<802828bc>] (kthread+0x11c/0x154 kernel/kthread.c:436) r10:00000000 r9:e024de88 r8:857ab200 r7:85edb100 r6:80277d08 r5:86780000 r4:932ef300 [<802827a0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xe03d5fb0 to 0xe03d5ff8) 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 r5:802827a0 r4:932ef300 INFO: task kworker/0:22:13234 is blocked on a mutex likely owned by task kworker/0:0:27883. task:kworker/0:0 state:R running task stack:0 pid:27883 tgid:27883 ppid:2 task_flags:0x4208060 flags:0x00000000 Workqueue: events bpf_prog_free_deferred Call trace: [<81baf6fc>] (__schedule) from [<81bb0f84>] (preempt_schedule_irq+0x40/0xa8 kernel/sched/core.c:7606) r10:82a0b4d8 r9:8541b200 r8:80200c04 r7:dfc01d84 r6:ffffffff r5:8541b200 r4:00000000 [<81bb0f44>] (preempt_schedule_irq) from [<80200c24>] (svc_preempt+0x8/0x18) Exception stack(0xdfc01d50 to 0xdfc01d98) 1d40: b9672000 eb204000 00000000 802397d0 1d60: 82cd6460 82cd70a4 7f00b000 eb204000 00000000 00000001 82a0b4d8 dfc01dc4 1d80: eb204000 dfc01da0 802306a4 802397e8 80000013 ffffffff r5:80000013 r4:802397e8 [<80230644>] (flush_tlb_kernel_range) from [<8052f3b8>] (__purge_vmap_area_lazy+0x28c/0x47c mm/vmalloc.c:2398) [<8052f12c>] (__purge_vmap_area_lazy) from [<8052f790>] (_vm_unmap_aliases+0x1e8/0x238 mm/vmalloc.c:3012) r10:00000000 r9:dfc01de8 r8:eac03000 r7:eac01000 r6:00000008 r5:dfc01e30 r4:dfc01de8 [<8052f5a8>] (_vm_unmap_aliases) from [<805334cc>] (vm_reset_perms mm/vmalloc.c:3404 [inline]) [<8052f5a8>] (_vm_unmap_aliases) from [<805334cc>] (vfree+0x110/0x17c mm/vmalloc.c:3508) r10:8302b005 r9:00800000 r8:ffffffff r7:00000001 r6:00000000 r5:00000000 r4:93231c00 [<805333bc>] (vfree) from [<805adcbc>] (execmem_free+0x34/0x54 mm/execmem.c:507) r8:8541b200 r7:00000000 r6:8302b000 r5:00001000 r4:7f033000 [<805adc88>] (execmem_free) from [<803e209c>] (bpf_jit_free_exec kernel/bpf/core.c:1134 [inline]) [<805adc88>] (execmem_free) from [<803e209c>] (bpf_jit_binary_free kernel/bpf/core.c:1180 [inline]) [<805adc88>] (execmem_free) from [<803e209c>] (bpf_jit_free+0x64/0xe0 kernel/bpf/core.c:1304) r5:00001000 r4:dfcc3000 [<803e2038>] (bpf_jit_free) from [<803e3208>] (bpf_prog_free_deferred+0x148/0x160 kernel/bpf/core.c:3113) r5:92fdef98 r4:92fdef98 [<803e30c0>] (bpf_prog_free_deferred) from [<8027714c>] (process_one_work+0x1f8/0x5cc kernel/workqueue.c:3396) r7:dddd1180 r6:8302b000 r5:92fdef98 r4:861c7680 [<80276f54>] (process_one_work) from [<80277e74>] (process_scheduled_works kernel/workqueue.c:3479 [inline]) [<80276f54>] (process_one_work) from [<80277e74>] (worker_thread+0x16c/0x318 kernel/workqueue.c:3560) r10:00000000 r9:861c76b0 r8:8541b200 r7:82a03d80 r6:dddd11a0 r5:dddd1180 r4:861c7680 [<80277d08>] (worker_thread) from [<802828bc>] (kthread+0x11c/0x154 kernel/kthread.c:436) r10:00000000 r9:e03d5e88 r8:8627b700 r7:861c7680 r6:80277d08 r5:8541b200 r4:931f5440 [<802827a0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xdfc01fb0 to 0xdfc01ff8) 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 r5:802827a0 r4:931f5440 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) r7:600c0193 r6:600c0193 r5:8230870c r4:00000000 [<80201ae4>] (show_stack) from [<8021e834>] (__dump_stack lib/dump_stack.c:94 [inline]) [<80201ae4>] (show_stack) from [<8021e834>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120) [<8021e7d8>] (dump_stack_lvl) from [<8021e860>] (dump_stack+0x18/0x1c lib/dump_stack.c:129) r7:00000000 r6:000c0113 r5:00000000 r4:00000001 [<8021e848>] (dump_stack) from [<81b98d24>] (nmi_cpu_backtrace+0x150/0x170 lib/nmi_backtrace.c:123) [<81b98bd4>] (nmi_cpu_backtrace) from [<81b98e78>] (nmi_trigger_cpumask_backtrace+0x134/0x208 lib/nmi_backtrace.c:66) r7:82a0b194 r6:83188000 r5:82a17cb8 r4:ffffffff [<81b98d44>] (nmi_trigger_cpumask_backtrace) from [<802300c8>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:851) r9:82a0b330 r8:00000048 r7:0000000a r6:82a03d80 r5:00007f02 r4:00000048 [<802300b0>] (arch_trigger_cpumask_backtrace) from [<81b98bd0>] (cpumask_backtrace+0x10/0x14 lib/nmi_backtrace.c:136) [<81b98bc0>] (cpumask_backtrace) from [<81ba09b8>] (trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]) [<81b98bc0>] (cpumask_backtrace) from [<81ba09b8>] (__sys_info lib/sys_info.c:157 [inline]) [<81b98bc0>] (cpumask_backtrace) from [<81ba09b8>] (sys_info+0x68/0xa8 lib/sys_info.c:165) [<81ba0950>] (sys_info) from [<80394128>] (check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]) [<81ba0950>] (sys_info) from [<80394128>] (watchdog+0x3ac/0x850 kernel/hung_task.c:561) r5:00007f02 r4:00000001 [<80393d7c>] (watchdog) from [<802828bc>] (kthread+0x11c/0x154 kernel/kthread.c:436) r10:00000000 r9:df819e60 r8:83125a00 r7:00000000 r6:80393d7c r5:83188000 r4:8387a9c0 [<802827a0>] (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 r5:802827a0 r4:8387a9c0