INFO: task kworker/0:1:28104 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/0:1 state:D stack:0 pid:28104 tgid:28104 ppid:2 task_flags:0x4208060 flags:0x00000000 Workqueue: events bpf_prog_free_deferred Call trace: [<81b5d3fc>] (__schedule) from [<81b5e894>] (__schedule_loop kernel/sched/core.c:7311 [inline]) [<81b5d3fc>] (__schedule) from [<81b5e894>] (schedule+0x2c/0xec kernel/sched/core.c:7326) r10:dfb95da4 r9:dfb95dac r8:00000002 r7:60000113 r6:82cd7e0c r5:8562b100 r4:8562b100 [<81b5e868>] (schedule) from [<81b5e9d8>] (schedule_preempt_disabled+0x18/0x24 kernel/sched/core.c:7383) r5:8562b100 r4:82cd7e08 [<81b5e9c0>] (schedule_preempt_disabled) from [<81b61b50>] (__mutex_lock_common kernel/locking/mutex.c:726 [inline]) [<81b5e9c0>] (schedule_preempt_disabled) from [<81b61b50>] (__mutex_lock.constprop.0+0x50c/0xa48 kernel/locking/mutex.c:821) [<81b61644>] (__mutex_lock.constprop.0) from [<81b62160>] (__mutex_lock_slowpath+0x14/0x18 kernel/locking/mutex.c:1164) r10:82a0b444 r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:dfb95e28 r4:86a39880 [<81b6214c>] (__mutex_lock_slowpath) from [<81b621a0>] (mutex_lock+0x3c/0x40 kernel/locking/mutex.c:319) [<81b62164>] (mutex_lock) from [<8051e710>] (_vm_unmap_aliases+0x5c/0x238 mm/vmalloc.c:2951) [<8051e6b4>] (_vm_unmap_aliases) from [<805224a0>] (vm_reset_perms mm/vmalloc.c:3382 [inline]) [<8051e6b4>] (_vm_unmap_aliases) from [<805224a0>] (vfree+0x110/0x17c mm/vmalloc.c:3486) r10:8302b005 r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:00000000 r4:86a39880 [<80522390>] (vfree) from [<80599068>] (execmem_free+0x30/0x50 mm/execmem.c:506) r9:8562b100 r8:00800000 r7:00000000 r6:8302b000 r5:00001000 r4:7f284000 [<80599038>] (execmem_free) from [<803dc798>] (bpf_jit_free_exec+0x10/0x14 kernel/bpf/core.c:1125) r5:00001000 r4:dfb07000 [<803dc788>] (bpf_jit_free_exec) from [<803dcc88>] (bpf_jit_binary_free kernel/bpf/core.c:1171 [inline]) [<803dc788>] (bpf_jit_free_exec) from [<803dcc88>] (bpf_jit_free+0x64/0xe0 kernel/bpf/core.c:1295) [<803dcc24>] (bpf_jit_free) from [<803ddd60>] (bpf_prog_free_deferred+0x148/0x160 kernel/bpf/core.c:3106) r5:85aa9798 r4:85aa9798 [<803ddc18>] (bpf_prog_free_deferred) from [<802761e8>] (process_one_work+0x1c8/0x580 kernel/workqueue.c:3322) r7:dddd0f00 r6:8302b000 r5:85aa9798 r4:86532200 [<80276020>] (process_one_work) from [<80276e94>] (process_scheduled_works kernel/workqueue.c:3405 [inline]) [<80276020>] (process_one_work) from [<80276e94>] (worker_thread+0x16c/0x318 kernel/workqueue.c:3486) r10:dddd0f00 r9:86532230 r8:8562b100 r7:82a03d80 r6:dddd0f20 r5:dddd0f00 r4:86532200 [<80276d28>] (worker_thread) from [<80281710>] (kthread+0x11c/0x154 kernel/kthread.c:436) r10:00000000 r9:dfd7de88 r8:86a65480 r7:86532200 r6:80276d28 r5:8562b100 r4:86909240 [<802815f4>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xdfb95fb0 to 0xdfb95ff8) 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 r5:802815f4 r4:86909240 INFO: task kworker/0:1:28104 is blocked on a mutex likely owned by task kworker/0:4:28142. task:kworker/0:4 state:R running task stack:0 pid:28142 tgid:28142 ppid:2 task_flags:0x4208060 flags:0x00000000 Workqueue: events bpf_prog_free_deferred Call trace: [<81b5d3fc>] (__schedule) from [<81b5ec84>] (preempt_schedule_irq+0x40/0xa8 kernel/sched/core.c:7556) r10:82a0b498 r9:84660000 r8:80200c04 r7:dfc65d7c r6:ffffffff r5:84660000 r4:00000000 [<81b5ec44>] (preempt_schedule_irq) from [<80200c24>] (svc_preempt+0x8/0x18) Exception stack(0xdfc65d48 to 0xdfc65d90) 5d40: a23e0000 eab9a000 00000000 80238790 82cd71a0 82cd7de4 5d60: 7f019000 eab9a000 00000000 00000001 82a0b498 dfc65dbc eab9a000 dfc65d98 5d80: 8022f6d0 802387a8 80000013 ffffffff r5:80000013 r4:802387a8 [<8022f670>] (flush_tlb_kernel_range) from [<8051e4c4>] (__purge_vmap_area_lazy+0x28c/0x47c mm/vmalloc.c:2376) [<8051e238>] (__purge_vmap_area_lazy) from [<8051e89c>] (_vm_unmap_aliases+0x1e8/0x238 mm/vmalloc.c:2990) r10:00000000 r9:dfc65de0 r8:00000000 r7:ffffffff r6:00000008 r5:dfc65e28 r4:dfc65de0 [<8051e6b4>] (_vm_unmap_aliases) from [<805224a0>] (vm_reset_perms mm/vmalloc.c:3382 [inline]) [<8051e6b4>] (_vm_unmap_aliases) from [<805224a0>] (vfree+0x110/0x17c mm/vmalloc.c:3486) r10:8302b005 r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:00000000 r4:84df1680 [<80522390>] (vfree) from [<80599068>] (execmem_free+0x30/0x50 mm/execmem.c:506) r9:84660000 r8:00800000 r7:00000000 r6:8302b000 r5:00001000 r4:7f310000 [<80599038>] (execmem_free) from [<803dc798>] (bpf_jit_free_exec+0x10/0x14 kernel/bpf/core.c:1125) r5:00001000 r4:dfb09000 [<803dc788>] (bpf_jit_free_exec) from [<803dcc88>] (bpf_jit_binary_free kernel/bpf/core.c:1171 [inline]) [<803dc788>] (bpf_jit_free_exec) from [<803dcc88>] (bpf_jit_free+0x64/0xe0 kernel/bpf/core.c:1295) [<803dcc24>] (bpf_jit_free) from [<803ddd60>] (bpf_prog_free_deferred+0x148/0x160 kernel/bpf/core.c:3106) r5:86483b98 r4:86483b98 [<803ddc18>] (bpf_prog_free_deferred) from [<802761e8>] (process_one_work+0x1c8/0x580 kernel/workqueue.c:3322) r7:dddd0f00 r6:8302b000 r5:86483b98 r4:862e4580 [<80276020>] (process_one_work) from [<80276e94>] (process_scheduled_works kernel/workqueue.c:3405 [inline]) [<80276020>] (process_one_work) from [<80276e94>] (worker_thread+0x16c/0x318 kernel/workqueue.c:3486) r10:dddd0f00 r9:862e45b0 r8:84660000 r7:82a03d80 r6:dddd0f20 r5:dddd0f00 r4:862e4580 [<80276d28>] (worker_thread) from [<80281710>] (kthread+0x11c/0x154 kernel/kthread.c:436) r10:00000000 r9:ea8c1e88 r8:868a6e80 r7:862e4580 r6:80276d28 r5:84660000 r4:8612d500 [<802815f4>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xdfc65fb0 to 0xdfc65ff8) 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 r5:802815f4 r4:8612d500 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: [<80201998>] (dump_backtrace) from [<80201a8c>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257) r7:600e0093 r6:600e0093 r5:82332bd4 r4:00000000 [<80201a74>] (show_stack) from [<8021e580>] (__dump_stack lib/dump_stack.c:94 [inline]) [<80201a74>] (show_stack) from [<8021e580>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120) [<8021e524>] (dump_stack_lvl) from [<8021e5ac>] (dump_stack+0x18/0x1c lib/dump_stack.c:129) r7:00000000 r6:000e0013 r5:00000000 r4:00000001 [<8021e594>] (dump_stack) from [<81b46a9c>] (nmi_cpu_backtrace+0x150/0x170 lib/nmi_backtrace.c:122) [<81b4694c>] (nmi_cpu_backtrace) from [<81b46bf0>] (nmi_trigger_cpumask_backtrace+0x134/0x208 lib/nmi_backtrace.c:65) r7:82a0b150 r6:83320c40 r5:82a1c7b8 r4:ffffffff [<81b46abc>] (nmi_trigger_cpumask_backtrace) from [<8022f0f4>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:851) r9:82a0b2f0 r8:00000001 r7:82a1ce80 r6:82ccae2c r5:00007e8d r4:00000048 [<8022f0dc>] (arch_trigger_cpumask_backtrace) from [<81b4e72c>] (trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]) [<8022f0dc>] (arch_trigger_cpumask_backtrace) from [<81b4e72c>] (__sys_info lib/sys_info.c:157 [inline]) [<8022f0dc>] (arch_trigger_cpumask_backtrace) from [<81b4e72c>] (sys_info+0x68/0xa8 lib/sys_info.c:165) [<81b4e6c4>] (sys_info) from [<8038f838>] (check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]) [<81b4e6c4>] (sys_info) from [<8038f838>] (watchdog+0x3a0/0x848 kernel/hung_task.c:561) r5:00007e8d r4:0000000a [<8038f498>] (watchdog) from [<80281710>] (kthread+0x11c/0x154 kernel/kthread.c:436) r10:00000000 r9:df819e60 r8:831d4600 r7:00000000 r6:8038f498 r5:83320c40 r4:833dd400 [<802815f4>] (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 r5:802815f4 r4:833dd400