INFO: task kworker/1:0:6008 blocked for more than 430 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:0 state:D stack:0 pid:6008 tgid:6008 ppid:2 task_flags:0x4208060 flags:0x00000000 Workqueue: events bpf_prog_free_deferred Call trace: [<81a391b4>] (__schedule) from [<81a3a148>] (__schedule_loop kernel/sched/core.c:7011 [inline]) [<81a391b4>] (__schedule) from [<81a3a148>] (schedule+0x2c/0x130 kernel/sched/core.c:7026) r10:e05e5d84 r9:00000002 r8:60000013 r7:82917120 r6:e05e5d8c r5:83b4e000 r4:83b4e000 [<81a3a11c>] (schedule) from [<81a3a530>] (schedule_preempt_disabled+0x18/0x24 kernel/sched/core.c:7083) r5:83b4e000 r4:8291711c [<81a3a518>] (schedule_preempt_disabled) from [<81a3d0e0>] (__mutex_lock_common kernel/locking/mutex.c:676 [inline]) [<81a3a518>] (schedule_preempt_disabled) from [<81a3d0e0>] (__mutex_lock.constprop.0+0x350/0xa24 kernel/locking/mutex.c:760) [<81a3cd90>] (__mutex_lock.constprop.0) from [<81a3d888>] (__mutex_lock_slowpath+0x14/0x18 kernel/locking/mutex.c:1049) r10:8280c960 r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:e05e5e08 r4:00000000 [<81a3d874>] (__mutex_lock_slowpath) from [<81a3d8c8>] (mutex_lock+0x3c/0x40 kernel/locking/mutex.c:274) [<81a3d88c>] (mutex_lock) from [<804e9568>] (_vm_unmap_aliases+0x68/0x240 mm/vmalloc.c:2918) [<804e9500>] (_vm_unmap_aliases) from [<804ed348>] (vm_reset_perms mm/vmalloc.c:3349 [inline]) [<804e9500>] (_vm_unmap_aliases) from [<804ed348>] (vfree+0x16c/0x210 mm/vmalloc.c:3428) r10:83016170 r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:84b2a140 r4:00000000 [<804ed1dc>] (vfree) from [<80557f48>] (execmem_free+0x30/0x50 mm/execmem.c:503) r9:83018605 r8:83b4e000 r7:00000000 r6:83018600 r5:00001000 r4:7f250000 [<80557f18>] (execmem_free) from [<803c5740>] (bpf_jit_free_exec+0x10/0x14 kernel/bpf/core.c:1052) r5:00001000 r4:ea7f3000 [<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) r5:85faa78c r4:84b52680 [<803c6a88>] (bpf_prog_free_deferred) from [<80278594>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3263) r7:ddde3d80 r6:83018600 r5:85faa78c r4:84b52680 [<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 r9:83b4e000 r8:84b526ac r7:82804d40 r6:ddde3d80 r5:ddde3da0 r4:84b52680 [<80278fe0>] (worker_thread) from [<80280200>] (kthread+0x12c/0x280 kernel/kthread.c:463) r10:00000000 r9:84b52680 r8:80278fe0 r7:dfe91e60 r6:84aebd80 r5:83b4e000 r4:00000001 [<802800d4>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xe05e5fb0 to 0xe05e5ff8) 5fa0: 00000000 00000000 00000000 00000000 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:802800d4 r4:869fca80 INFO: task kworker/1:0:6008 is blocked on a mutex likely owned by task kworker/1:2:45. task:kworker/1:2 state:R running task stack:0 pid:45 tgid:45 ppid:2 task_flags:0x4208060 flags:0x00000000 Workqueue: events bpf_prog_free_deferred Call trace: [<81a391b4>] (__schedule) from [<81a3a57c>] (preempt_schedule_irq+0x40/0xa8 kernel/sched/core.c:7256) r10:8280c9b4 r9:8338b000 r8:80200c04 r7:df919d54 r6:ffffffff r5:8338b000 r4:00000000 [<81a3a53c>] (preempt_schedule_irq) from [<80200c24>] (svc_preempt+0x8/0x18) Exception stack(0xdf919d20 to 0xdf919d68) 9d20: 9eae5000 ec373000 00000001 80239bf8 7f24a000 00000001 82aca1c4 82ac95a0 9d40: 7f24a000 ec373000 8280c9b4 df919d9c df919da0 df919d70 80230af0 80239c10 9d60: 80000113 ffffffff r5:80000113 r4:80239c10 [<80230a8c>] (flush_tlb_kernel_range) from [<804e932c>] (__purge_vmap_area_lazy+0x284/0x458 mm/vmalloc.c:2342) r4:82aca1e4 [<804e90a8>] (__purge_vmap_area_lazy) from [<804e96e4>] (_vm_unmap_aliases+0x1e4/0x240 mm/vmalloc.c:2957) r10:00000000 r9:00000000 r8:00000000 r7:ffffffff r6:df919dc0 r5:df919e08 r4:df919dc0 [<804e9500>] (_vm_unmap_aliases) from [<804ed348>] (vm_reset_perms mm/vmalloc.c:3349 [inline]) [<804e9500>] (_vm_unmap_aliases) from [<804ed348>] (vfree+0x16c/0x210 mm/vmalloc.c:3428) r10:83016170 r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:84b2a840 r4:00000000 [<804ed1dc>] (vfree) from [<80557f48>] (execmem_free+0x30/0x50 mm/execmem.c:503) r9:83018605 r8:8338b000 r7:00000000 r6:83018600 r5:00001000 r4:7f24e000 [<80557f18>] (execmem_free) from [<803c5740>] (bpf_jit_free_exec+0x10/0x14 kernel/bpf/core.c:1052) r5:00001000 r4:e0669000 [<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) r5:8591d38c r4:833c3000 [<803c6a88>] (bpf_prog_free_deferred) from [<80278594>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3263) r7:ddde3d80 r6:83018600 r5:8591d38c r4:833c3000 [<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 r9:8338b000 r8:833c302c r7:82804d40 r6:ddde3d80 r5:ddde3da0 r4:833c3000 [<80278fe0>] (worker_thread) from [<80280200>] (kthread+0x12c/0x280 kernel/kthread.c:463) r10:00000000 r9:833c3000 r8:80278fe0 r7:df911e60 r6:833c3080 r5:8338b000 r4:00000001 [<802800d4>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xdf919fb0 to 0xdf919ff8) 9fa0: 00000000 00000000 00000000 00000000 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:802800d4 r4:833c1380 NMI backtrace for cpu 0 CPU: 0 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 r6:00000013 r5:60000093 r4:8224e02c [<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) r5:00000000 r4:00000001 [<8021f930>] (dump_stack) from [<81a22dcc>] (nmi_cpu_backtrace+0x160/0x17c lib/nmi_backtrace.c:113) [<81a22c6c>] (nmi_cpu_backtrace) from [<81a22f18>] (nmi_trigger_cpumask_backtrace+0x130/0x1d8 lib/nmi_backtrace.c:62) r7:00000000 r6:8280c690 r5:8281ae00 r4:ffffffff [<81a22de8>] (nmi_trigger_cpumask_backtrace) from [<802304fc>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:852) r9:8281b9e8 r8:8280c810 r7:0001339d r6:00007f25 r5:82abe7d4 r4:8325af0c [<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 r7:830cf600 r6:830cf600 r5:83221800 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 r4:833a6e40 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 2822 Comm: pr/ttyAMA-1 Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at in_vrf_postrouting net/netfilter/nf_nat_core.c:908 [inline] PC is at nf_nat_inet_fn+0x2c/0x300 net/netfilter/nf_nat_core.c:931 LR is at nf_nat_ipv4_fn net/netfilter/nf_nat_proto.c:602 [inline] LR is at nf_nat_ipv4_local_in+0x58/0x168 net/netfilter/nf_nat_proto.c:690 pc : [<816daa24>] lr : [<816dc620>] psr: a0000113 sp : df805cb0 ip : df805cf0 fp : df805cec r10: ddde4ec8 r9 : 84706f18 r8 : 00000001 r7 : 86969e40 r6 : 86969e40 r5 : df805d3c r4 : 85d9d103 r3 : 860bbc40 r2 : df805d3c r1 : 86969e40 r0 : 860bbc40 Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85bac540 DAC: 00000000 Call trace: frame pointer underflow [<816da9f8>] (nf_nat_inet_fn) from [<816dc620>] (nf_nat_ipv4_fn net/netfilter/nf_nat_proto.c:602 [inline]) [<816da9f8>] (nf_nat_inet_fn) from [<816dc620>] (nf_nat_ipv4_local_in+0x58/0x168 net/netfilter/nf_nat_proto.c:690) r10:ddde4ec8 r9:84706f18 r8:df805d3c r7:86969e40 r6:aa1414ac r5:00000000 r4:86969e40 [<816dc5c8>] (nf_nat_ipv4_local_in) from [<816ab97c>] (nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]) [<816dc5c8>] (nf_nat_ipv4_local_in) from [<816ab97c>] (nf_hook_slow+0x40/0x104 net/netfilter/core.c:623) r7:86969e40 r6:84706f00 r5:00000003 r4:00000001 [<816ab93c>] (nf_hook_slow) from [<8173f884>] (nf_hook include/linux/netfilter.h:273 [inline]) [<816ab93c>] (nf_hook_slow) from [<8173f884>] (NF_HOOK include/linux/netfilter.h:316 [inline]) [<816ab93c>] (nf_hook_slow) from [<8173f884>] (ip_local_deliver+0xf0/0x110 net/ipv4/ip_input.c:260) r9:00000040 r8:0000000a r7:00000000 r6:85769d80 r5:85757800 r4:86969e40 [<8173f794>] (ip_local_deliver) from [<8173e91c>] (dst_input include/net/dst.h:474 [inline]) [<8173f794>] (ip_local_deliver) from [<8173e91c>] (ip_rcv_finish+0x98/0xb0 net/ipv4/ip_input.c:453) r6:85757800 r5:85769d80 r4:86969e40 [<8173e884>] (ip_rcv_finish) from [<8173f978>] (NF_HOOK include/linux/netfilter.h:318 [inline]) [<8173e884>] (ip_rcv_finish) from [<8173f978>] (NF_HOOK include/linux/netfilter.h:312 [inline]) [<8173e884>] (ip_rcv_finish) from [<8173f978>] (ip_rcv+0xd4/0xe0 net/ipv4/ip_input.c:573) r7:00000000 r6:85769d80 r5:86969e40 r4:00000001 [<8173f8a4>] (ip_rcv) from [<8158b8f4>] (__netif_receive_skb_one_core+0x5c/0x80 net/core/dev.c:6079) r6:00000000 r5:8173f8a4 r4:85757800 [<8158b898>] (__netif_receive_skb_one_core) from [<8158b960>] (__netif_receive_skb+0x18/0x5c net/core/dev.c:6192) r5:ddde4fb0 r4:86969e40 [<8158b948>] (__netif_receive_skb) from [<8158bc68>] (process_backlog+0xa0/0x17c net/core/dev.c:6544) r5:ddde4fb0 r4:86969e40 [<8158bbc8>] (process_backlog) from [<8158c4c8>] (__napi_poll+0x34/0x240 net/core/dev.c:7594) r10:00000000 r9:df805ea8 r8:00000000 r7:df805ea3 r6:00000040 r5:ddde4fb0 r4:00000001 [<8158c494>] (__napi_poll) from [<8158cd20>] (napi_poll net/core/dev.c:7657 [inline]) [<8158c494>] (__napi_poll) from [<8158cd20>] (net_rx_action+0x358/0x3ec net/core/dev.c:7784) r9:df805ea8 r8:00000000 r7:0000012c r6:5b722000 r5:ddde4fb0 r4:ffffffff [<8158c9c8>] (net_rx_action) from [<8025be18>] (handle_softirqs+0x140/0x458 kernel/softirq.c:622) r10:840ba400 r9:82804d40 r8:00000101 r7:00000003 r6:00000288 r5:00000004 r4:8280408c [<8025bcd8>] (handle_softirqs) from [<8025c28c>] (__do_softirq kernel/softirq.c:656 [inline]) [<8025bcd8>] (handle_softirqs) from [<8025c28c>] (invoke_softirq kernel/softirq.c:496 [inline]) [<8025bcd8>] (handle_softirqs) from [<8025c28c>] (__irq_exit_rcu+0x110/0x1d0 kernel/softirq.c:723) r10:829594d4 r9:840ba400 r8:00000000 r7:eb979e60 r6:823fe2a4 r5:82438e3c r4:840ba400 [<8025c17c>] (__irq_exit_rcu) from [<8025c604>] (irq_exit+0x10/0x18 kernel/softirq.c:751) r5:82438e3c r4:826c199c [<8025c5f4>] (irq_exit) from [<81a35a20>] (generic_handle_arch_irq+0x7c/0x80 kernel/irq/handle.c:287) [<81a359a4>] (generic_handle_arch_irq) from [<81a05e80>] (call_with_stack+0x1c/0x20 arch/arm/lib/call_with_stack.S:40) r9:840ba400 r8:00000000 r7:eb979e94 r6:ffffffff r5:60000013 r4:81a4317c [<81a05e64>] (call_with_stack) from [<80200bec>] (__irq_svc+0x8c/0xbc arch/arm/kernel/entry-armv.S:228) Exception stack(0xeb979e60 to 0xeb979ea8) 9e60: 8403b440 60000013 00000000 00000954 00000001 00000000 82959438 00000117 9e80: 00000000 00000001 829594d4 eb979ebc eb979ec0 eb979eb0 80a8da08 81a4317c 9ea0: 60000013 ffffffff [<81a43154>] (_raw_spin_unlock_irqrestore) from [<80a8da08>] (spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]) [<81a43154>] (_raw_spin_unlock_irqrestore) from [<80a8da08>] (__uart_port_unlock_irqrestore include/linux/serial_core.h:616 [inline]) [<81a43154>] (_raw_spin_unlock_irqrestore) from [<80a8da08>] (pl011_console_device_unlock+0x20/0x24 drivers/tty/serial/amba-pl011.c:2603) [<80a8d9e8>] (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 r5:840ba400 r4:82959438 [<802e3108>] (nbcon_kthread_func) from [<80280200>] (kthread+0x12c/0x280 kernel/kthread.c:463) r10:00000000 r9:82959438 r8:802e3108 r7:84239200 r6:84239200 r5:840ba400 r4:00000001 [<802800d4>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xeb979fb0 to 0xeb979ff8) 9fa0: 00000000 00000000 00000000 00000000 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:802800d4 r4:83a44700