INFO: task kworker/1:0:21465 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/1:0 state:D stack:0 pid:21465 tgid:21465 ppid:2 task_flags:0x4208060 flags:0x00000000 Workqueue: events bpf_prog_free_deferred Call trace: [<81aabfd0>] (__schedule) from [<81aad324>] (__schedule_loop kernel/sched/core.c:6949 [inline]) [<81aabfd0>] (__schedule) from [<81aad324>] (schedule+0x2c/0x134 kernel/sched/core.c:6964) r10:eab51d9c r9:00000000 r8:60000113 r7:eab51da4 r6:82917960 r5:83ef9800 r4:83ef9800 [<81aad2f8>] (schedule) from [<81aad4b0>] (schedule_preempt_disabled+0x18/0x24 kernel/sched/core.c:7021) r5:83ef9800 r4:8291795c [<81aad498>] (schedule_preempt_disabled) from [<81ab0a6c>] (__mutex_lock_common kernel/locking/mutex.c:692 [inline]) [<81aad498>] (schedule_preempt_disabled) from [<81ab0a6c>] (__mutex_lock.constprop.0+0x584/0xf10 kernel/locking/mutex.c:776) [<81ab04e8>] (__mutex_lock.constprop.0) from [<81ab14cc>] (__mutex_lock_slowpath+0x14/0x18 kernel/locking/mutex.c:1065) r10:8280c81c r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:eab51e20 r4:00000000 [<81ab14b8>] (__mutex_lock_slowpath) from [<81ab150c>] (mutex_lock+0x3c/0x40 kernel/locking/mutex.c:290) [<81ab14d0>] (mutex_lock) from [<804f05e4>] (_vm_unmap_aliases+0x5c/0x238 mm/vmalloc.c:2944) [<804f0588>] (_vm_unmap_aliases) from [<804f42cc>] (vm_reset_perms mm/vmalloc.c:3375 [inline]) [<804f0588>] (_vm_unmap_aliases) from [<804f42cc>] (vfree+0x16c/0x210 mm/vmalloc.c:3454) r10:83018605 r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:85fcde00 r4:00000000 [<804f4160>] (vfree) from [<8055fd50>] (execmem_free+0x30/0x50 mm/execmem.c:503) r9:83016170 r8:83ef9800 r7:00000000 r6:83018600 r5:00001000 r4:7f26c000 [<8055fd20>] (execmem_free) from [<803c9bd0>] (bpf_jit_free_exec+0x10/0x14 kernel/bpf/core.c:1068) r5:00001000 r4:df9e5000 [<803c9bc0>] (bpf_jit_free_exec) from [<803c9fb0>] (bpf_jit_binary_free kernel/bpf/core.c:1114 [inline]) [<803c9bc0>] (bpf_jit_free_exec) from [<803c9fb0>] (bpf_jit_free+0x64/0xe0 kernel/bpf/core.c:1237) [<803c9f4c>] (bpf_jit_free) from [<803caedc>] (bpf_prog_free_deferred+0x140/0x158 kernel/bpf/core.c:2935) r5:87a72794 r4:85d36a00 [<803cad9c>] (bpf_prog_free_deferred) from [<80276dbc>] (process_one_work+0x1b8/0x4fc kernel/workqueue.c:3257) r7:ddde3bc0 r6:83018600 r5:87a72794 r4:85d36a00 [<80276c04>] (process_one_work) from [<80277a40>] (process_scheduled_works kernel/workqueue.c:3340 [inline]) [<80276c04>] (process_one_work) from [<80277a40>] (worker_thread+0x1c4/0x394 kernel/workqueue.c:3421) r10:61c88647 r9:83ef9800 r8:82804d80 r7:85d36a2c r6:ddde3bc0 r5:ddde3be0 r4:85d36a00 [<8027787c>] (worker_thread) from [<8027fd90>] (kthread+0x118/0x138 kernel/kthread.c:467) r10:00000000 r9:85d36a00 r8:8027787c r7:ea41de80 r6:83ef9800 r5:85d36800 r4:85fc2800 [<8027fc78>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xeab51fb0 to 0xeab51ff8) 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 r5:8027fc78 r4:85fc2800 INFO: task kworker/1:0:21465 is blocked on a mutex likely owned by task kworker/1:13:21599. task:kworker/1:13 state:R running task stack:0 pid:21599 tgid:21599 ppid:2 task_flags:0x4208060 flags:0x00000000 Workqueue: events bpf_prog_free_deferred Call trace: [<81aabfd0>] (__schedule) from [<81aad75c>] (preempt_schedule_irq+0x40/0xa8 kernel/sched/core.c:7194) r10:8280c870 r9:86956000 r8:80200c04 r7:ea3c1d74 r6:ffffffff r5:86956000 r4:00000000 [<81aad71c>] (preempt_schedule_irq) from [<80200c24>] (svc_preempt+0x8/0x18) Exception stack(0xea3c1d40 to 0xea3c1d88) 1d40: d7554000 eb8fd000 00000000 80239570 82ace5e0 82acf224 7f003000 eb8fd000 1d60: 00000000 00000001 8280c870 ea3c1db4 eb8fd000 ea3c1d90 802304dc 80239588 1d80: 800f0113 ffffffff r5:800f0113 r4:80239588 [<8023047c>] (flush_tlb_kernel_range) from [<804f0398>] (__purge_vmap_area_lazy+0x260/0x450 mm/vmalloc.c:2369) [<804f0138>] (__purge_vmap_area_lazy) from [<804f0770>] (_vm_unmap_aliases+0x1e8/0x238 mm/vmalloc.c:2983) r10:00000000 r9:ea3c1dd8 r8:00000000 r7:ffffffff r6:00000008 r5:ea3c1e20 r4:ea3c1dd8 [<804f0588>] (_vm_unmap_aliases) from [<804f42cc>] (vm_reset_perms mm/vmalloc.c:3375 [inline]) [<804f0588>] (_vm_unmap_aliases) from [<804f42cc>] (vfree+0x16c/0x210 mm/vmalloc.c:3454) r10:83018605 r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:85fcd7c0 r4:00000000 [<804f4160>] (vfree) from [<8055fd50>] (execmem_free+0x30/0x50 mm/execmem.c:503) r9:83016170 r8:86956000 r7:00000000 r6:83018600 r5:00001000 r4:7f26a000 [<8055fd20>] (execmem_free) from [<803c9bd0>] (bpf_jit_free_exec+0x10/0x14 kernel/bpf/core.c:1068) r5:00001000 r4:df9be000 [<803c9bc0>] (bpf_jit_free_exec) from [<803c9fb0>] (bpf_jit_binary_free kernel/bpf/core.c:1114 [inline]) [<803c9bc0>] (bpf_jit_free_exec) from [<803c9fb0>] (bpf_jit_free+0x64/0xe0 kernel/bpf/core.c:1237) [<803c9f4c>] (bpf_jit_free) from [<803caedc>] (bpf_prog_free_deferred+0x140/0x158 kernel/bpf/core.c:2935) r5:86db3f94 r4:8641ff00 [<803cad9c>] (bpf_prog_free_deferred) from [<80276dbc>] (process_one_work+0x1b8/0x4fc kernel/workqueue.c:3257) r7:ddde3bc0 r6:83018600 r5:86db3f94 r4:8641ff00 [<80276c04>] (process_one_work) from [<80277a40>] (process_scheduled_works kernel/workqueue.c:3340 [inline]) [<80276c04>] (process_one_work) from [<80277a40>] (worker_thread+0x1c4/0x394 kernel/workqueue.c:3421) r10:61c88647 r9:86956000 r8:82804d80 r7:8641ff2c r6:ddde3bc0 r5:ddde3be0 r4:8641ff00 [<8027787c>] (worker_thread) from [<8027fd90>] (kthread+0x118/0x138 kernel/kthread.c:467) r10:00000000 r9:8641ff00 r8:8027787c r7:ea3b9e80 r6:86956000 r5:86458580 r4:85d5c380 [<8027fc78>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xea3c1fb0 to 0xea3c1ff8) 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 r5:8027fc78 r4:85d5c380 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: [<802019e8>] (dump_backtrace) from [<80201adc>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257) r7:60000193 r6:60000193 r5:822a24dc r4:00000000 [<80201ac4>] (show_stack) from [<8021ee20>] (__dump_stack lib/dump_stack.c:94 [inline]) [<80201ac4>] (show_stack) from [<8021ee20>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120) [<8021edc4>] (dump_stack_lvl) from [<8021ee4c>] (dump_stack+0x18/0x1c lib/dump_stack.c:129) r7:00000000 r6:00000113 r5:00000000 r4:00000001 [<8021ee34>] (dump_stack) from [<81a95bac>] (nmi_cpu_backtrace+0x150/0x170 lib/nmi_backtrace.c:113) [<81a95a5c>] (nmi_cpu_backtrace) from [<81a95cfc>] (nmi_trigger_cpumask_backtrace+0x130/0x1d8 lib/nmi_backtrace.c:62) r7:00000000 r6:8280c550 r5:8281addc r4:ffffffff [<81a95bcc>] (nmi_trigger_cpumask_backtrace) from [<8022ff00>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:852) r9:8280c6c8 r8:82ac37e4 r7:00090fd4 r6:82804d80 r5:00007e8f r4:00000048 [<8022fee8>] (arch_trigger_cpumask_backtrace) from [<81a9d7ec>] (trigger_all_cpu_backtrace include/linux/nmi.h:161 [inline]) [<8022fee8>] (arch_trigger_cpumask_backtrace) from [<81a9d7ec>] (__sys_info lib/sys_info.c:157 [inline]) [<8022fee8>] (arch_trigger_cpumask_backtrace) from [<81a9d7ec>] (sys_info+0x68/0xa8 lib/sys_info.c:165) [<81a9d784>] (sys_info) from [<803820ec>] (check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline]) [<81a9d784>] (sys_info) from [<803820ec>] (watchdog+0x44c/0x884 kernel/hung_task.c:515) r5:00007e8f r4:84d55a24 [<80381ca0>] (watchdog) from [<8027fd90>] (kthread+0x118/0x138 kernel/kthread.c:467) r10:00000000 r9:00000000 r8:80381ca0 r7:df819e60 r6:832e1800 r5:832d5080 r4:8388f580 [<8027fc78>] (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 r5:8027fc78 r4:8388f580 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 27537 Comm: syz-executor Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP 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 unlock_hrtimer_base kernel/time/hrtimer.c:1013 [inline] LR is at hrtimer_start_range_ns+0x170/0x530 kernel/time/hrtimer.c:1325 pc : [<81ab6f64>] lr : [<8032896c>] psr: 60000113 sp : df805dc8 ip : df805dd8 fp : df805dd4 r10: ddddb080 r9 : ddddb0c0 r8 : 00000040 r7 : ddddb0c0 r6 : ddddb080 r5 : ddddb0c0 r4 : 85f651a8 r3 : 00006431 r2 : 0000001f r1 : 20000113 r0 : ddddb080 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85fa1d00 DAC: 00000000 Call trace: frame pointer underflow [<81ab6f3c>] (_raw_spin_unlock_irqrestore) from [<8032896c>] (unlock_hrtimer_base kernel/time/hrtimer.c:1013 [inline]) [<81ab6f3c>] (_raw_spin_unlock_irqrestore) from [<8032896c>] (hrtimer_start_range_ns+0x170/0x530 kernel/time/hrtimer.c:1325) [<803287fc>] (hrtimer_start_range_ns) from [<8164c180>] (qdisc_watchdog_schedule_range_ns net/sched/sch_api.c:653 [inline]) [<803287fc>] (hrtimer_start_range_ns) from [<8164c180>] (qdisc_watchdog_schedule_range_ns+0x8c/0x94 net/sched/sch_api.c:630) r10:93684aa9 r9:00000000 r8:00000000 r7:00000000 r6:000005ac r5:7f4380c0 r4:85f651a8 [<8164c0f4>] (qdisc_watchdog_schedule_range_ns) from [<81680a10>] (qdisc_watchdog_schedule_ns include/net/pkt_sched.h:75 [inline]) [<8164c0f4>] (qdisc_watchdog_schedule_range_ns) from [<81680a10>] (tbf_dequeue+0x2a0/0x400 net/sched/sch_tbf.c:317) r9:a5696d43 r8:ffffff8c r7:0000005e r6:85f65140 r5:1424c9e9 r4:85f65000 [<81680770>] (tbf_dequeue) from [<816488b0>] (dequeue_skb net/sched/sch_generic.c:297 [inline]) [<81680770>] (tbf_dequeue) from [<816488b0>] (qdisc_restart net/sched/sch_generic.c:402 [inline]) [<81680770>] (tbf_dequeue) from [<816488b0>] (__qdisc_run+0x90/0x804 net/sched/sch_generic.c:420) r10:00000040 r9:85f65090 r8:85f65054 r7:00000001 r6:00000000 r5:ddde5080 r4:85f65000 [<81648820>] (__qdisc_run) from [<815bc8e8>] (qdisc_run include/net/pkt_sched.h:120 [inline]) [<81648820>] (__qdisc_run) from [<815bc8e8>] (qdisc_run include/net/pkt_sched.h:117 [inline]) [<81648820>] (__qdisc_run) from [<815bc8e8>] (net_tx_action+0x13c/0x40c net/core/dev.c:5796) r10:00000004 r9:85f65090 r8:85f6508c r7:00000001 r6:00000000 r5:ddde5080 r4:85f65000 [<815bc7ac>] (net_tx_action) from [<8025b4e8>] (handle_softirqs+0x15c/0x468 kernel/softirq.c:622) r10:00000004 r9:861c3c00 r8:00000100 r7:00000008 r6:00000002 r5:00000003 r4:82804088 [<8025b38c>] (handle_softirqs) from [<8025b990>] (__do_softirq kernel/softirq.c:656 [inline]) [<8025b38c>] (handle_softirqs) from [<8025b990>] (invoke_softirq kernel/softirq.c:496 [inline]) [<8025b38c>] (handle_softirqs) from [<8025b990>] (__irq_exit_rcu+0x150/0x1d0 kernel/softirq.c:723) r10:00000000 r9:cccccccd r8:00000000 r7:dfa15fb0 r6:8244e8d8 r5:824893e0 r4:861c3c00 [<8025b840>] (__irq_exit_rcu) from [<8025bcc8>] (irq_exit+0x10/0x18 kernel/softirq.c:751) r5:824893e0 r4:826c2b1c [<8025bcb8>] (irq_exit) from [<81aa881c>] (generic_handle_arch_irq+0x7c/0x80 kernel/irq/handle.c:295) [<81aa87a0>] (generic_handle_arch_irq) from [<81a77af8>] (call_with_stack+0x1c/0x20 arch/arm/lib/call_with_stack.S:40) r9:cccccccd r8:826b8044 r7:861c3c00 r6:ffffffff r5:60000010 r4:000290e8 [<81a77adc>] (call_with_stack) from [<80200f68>] (__irq_usr+0x88/0xa0 arch/arm/kernel/entry-armv.S:443) Exception stack(0xdfa15fb0 to 0xdfa15ff8) 5fa0: 00000000 00000000 00000000 00000000 5fc0: 00000004 ffffffff 00000000 00008ca0 00002328 cccccccd 00000000 7eb4cad0 5fe0: 00000001 7eb4ca38 0010aeb4 000290e8 60000010 ffffffff