INFO: task kworker/1:8:22299 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/1:8 state:D stack:0 pid:22299 tgid:22299 ppid:2 task_flags:0x4208060 flags:0x00000000 Workqueue: events bpf_prog_free_deferred Call trace: [<81b6017c>] (__schedule) from [<81b61614>] (__schedule_loop kernel/sched/core.c:7311 [inline]) [<81b6017c>] (__schedule) from [<81b61614>] (schedule+0x2c/0xec kernel/sched/core.c:7326) r10:e02f5da4 r9:e02f5dac r8:00000002 r7:60000013 r6:82cd7e0c r5:839fe200 r4:839fe200 [<81b615e8>] (schedule) from [<81b61758>] (schedule_preempt_disabled+0x18/0x24 kernel/sched/core.c:7383) r5:839fe200 r4:82cd7e08 [<81b61740>] (schedule_preempt_disabled) from [<81b648d0>] (__mutex_lock_common kernel/locking/mutex.c:726 [inline]) [<81b61740>] (schedule_preempt_disabled) from [<81b648d0>] (__mutex_lock.constprop.0+0x50c/0xa48 kernel/locking/mutex.c:821) [<81b643c4>] (__mutex_lock.constprop.0) from [<81b64ee0>] (__mutex_lock_slowpath+0x14/0x18 kernel/locking/mutex.c:1164) r10:82a0b444 r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:e02f5e28 r4:8cc1f380 [<81b64ecc>] (__mutex_lock_slowpath) from [<81b64f20>] (mutex_lock+0x3c/0x40 kernel/locking/mutex.c:319) [<81b64ee4>] (mutex_lock) from [<8051eb70>] (_vm_unmap_aliases+0x5c/0x238 mm/vmalloc.c:2973) [<8051eb14>] (_vm_unmap_aliases) from [<80522900>] (vm_reset_perms mm/vmalloc.c:3404 [inline]) [<8051eb14>] (_vm_unmap_aliases) from [<80522900>] (vfree+0x110/0x17c mm/vmalloc.c:3508) r10:8302ae05 r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:00000000 r4:8cc1f380 [<805227f0>] (vfree) from [<80599610>] (execmem_free+0x30/0x50 mm/execmem.c:506) r9:839fe200 r8:01800000 r7:00000000 r6:8302ae00 r5:00001000 r4:7f2e2000 [<805995e0>] (execmem_free) from [<803dc978>] (bpf_jit_free_exec+0x10/0x14 kernel/bpf/core.c:1125) r5:00001000 r4:dfcf5000 [<803dc968>] (bpf_jit_free_exec) from [<803dce68>] (bpf_jit_binary_free kernel/bpf/core.c:1171 [inline]) [<803dc968>] (bpf_jit_free_exec) from [<803dce68>] (bpf_jit_free+0x64/0xe0 kernel/bpf/core.c:1295) [<803dce04>] (bpf_jit_free) from [<803ddf40>] (bpf_prog_free_deferred+0x148/0x160 kernel/bpf/core.c:3106) r5:85fa7398 r4:85fa7398 [<803dddf8>] (bpf_prog_free_deferred) from [<802761e8>] (process_one_work+0x1c8/0x580 kernel/workqueue.c:3322) r7:ddde4f00 r6:8302ae00 r5:85fa7398 r4:86026700 [<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:ddde4f00 r9:86026730 r8:839fe200 r7:82a03d80 r6:ddde4f20 r5:ddde4f00 r4:86026700 [<80276d28>] (worker_thread) from [<80281710>] (kthread+0x11c/0x154 kernel/kthread.c:436) r10:00000000 r9:e030de88 r8:86026180 r7:86026700 r6:80276d28 r5:839fe200 r4:8601b040 [<802815f4>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xe02f5fb0 to 0xe02f5ff8) 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 r4:8601b040 INFO: task kworker/1:8:22299 is blocked on a mutex likely owned by task kworker/1:2:21944. task:kworker/1:2 state:R running task stack:0 pid:21944 tgid:21944 ppid:2 task_flags:0x4208060 flags:0x00000000 Workqueue: events bpf_prog_free_deferred Call trace: [<81b6017c>] (__schedule) from [<81b61a04>] (preempt_schedule_irq+0x40/0xa8 kernel/sched/core.c:7556) r10:82a0b498 r9:847bb100 r8:80200c04 r7:e0181d7c r6:ffffffff r5:847bb100 r4:00000000 [<81b619c4>] (preempt_schedule_irq) from [<80200c24>] (svc_preempt+0x8/0x18) Exception stack(0xe0181d48 to 0xe0181d90) 1d40: 83f49000 ebd7f000 00000000 80238790 82cd71a0 82cd7de4 1d60: 7f23e000 ebd7f000 00000000 00000001 82a0b498 e0181dbc ebd7f000 e0181d98 1d80: 8022f6d0 802387a8 80000113 ffffffff r5:80000113 r4:802387a8 [<8022f670>] (flush_tlb_kernel_range) from [<8051e924>] (__purge_vmap_area_lazy+0x28c/0x47c mm/vmalloc.c:2398) [<8051e698>] (__purge_vmap_area_lazy) from [<8051ecfc>] (_vm_unmap_aliases+0x1e8/0x238 mm/vmalloc.c:3012) r10:00000000 r9:e0181de0 r8:00000000 r7:ffffffff r6:00000008 r5:e0181e28 r4:e0181de0 [<8051eb14>] (_vm_unmap_aliases) from [<80522900>] (vm_reset_perms mm/vmalloc.c:3404 [inline]) [<8051eb14>] (_vm_unmap_aliases) from [<80522900>] (vfree+0x110/0x17c mm/vmalloc.c:3508) r10:8302ae05 r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:00000000 r4:8616e900 [<805227f0>] (vfree) from [<80599610>] (execmem_free+0x30/0x50 mm/execmem.c:506) r9:847bb100 r8:01800000 r7:00000000 r6:8302ae00 r5:00001000 r4:7f2e4000 [<805995e0>] (execmem_free) from [<803dc978>] (bpf_jit_free_exec+0x10/0x14 kernel/bpf/core.c:1125) r5:00001000 r4:dfd13000 [<803dc968>] (bpf_jit_free_exec) from [<803dce68>] (bpf_jit_binary_free kernel/bpf/core.c:1171 [inline]) [<803dc968>] (bpf_jit_free_exec) from [<803dce68>] (bpf_jit_free+0x64/0xe0 kernel/bpf/core.c:1295) [<803dce04>] (bpf_jit_free) from [<803ddf40>] (bpf_prog_free_deferred+0x148/0x160 kernel/bpf/core.c:3106) r5:8633fb98 r4:8633fb98 [<803dddf8>] (bpf_prog_free_deferred) from [<802761e8>] (process_one_work+0x1c8/0x580 kernel/workqueue.c:3322) r7:ddde4f00 r6:8302ae00 r5:8633fb98 r4:98e77680 [<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:ddde4f00 r9:98e776b0 r8:847bb100 r7:82a03d80 r6:ddde4f20 r5:ddde4f00 r4:98e77680 [<80276d28>] (worker_thread) from [<80281710>] (kthread+0x11c/0x154 kernel/kthread.c:436) r10:00000000 r9:ea841e88 r8:98e77600 r7:98e77680 r6:80276d28 r5:847bb100 r4:8cb1e340 [<802815f4>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xe0181fb0 to 0xe0181ff8) 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 r5:802815f4 r4:8cb1e340 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) r7:60090093 r6:60090093 r5:82333190 r4:00000000 [<80201a74>] (show_stack) from [<8021e60c>] (__dump_stack lib/dump_stack.c:94 [inline]) [<80201a74>] (show_stack) from [<8021e60c>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120) [<8021e5b0>] (dump_stack_lvl) from [<8021e638>] (dump_stack+0x18/0x1c lib/dump_stack.c:129) r7:00000000 r6:00090013 r5:00000000 r4:00000001 [<8021e620>] (dump_stack) from [<81b4981c>] (nmi_cpu_backtrace+0x150/0x170 lib/nmi_backtrace.c:122) [<81b496cc>] (nmi_cpu_backtrace) from [<81b49970>] (nmi_trigger_cpumask_backtrace+0x134/0x208 lib/nmi_backtrace.c:65) r7:82a0b150 r6:83178000 r5:82a1c7b8 r4:ffffffff [<81b4983c>] (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 r5:00007ee1 r4:00000048 [<8022f0dc>] (arch_trigger_cpumask_backtrace) from [<81b514ac>] (trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]) [<8022f0dc>] (arch_trigger_cpumask_backtrace) from [<81b514ac>] (__sys_info lib/sys_info.c:157 [inline]) [<8022f0dc>] (arch_trigger_cpumask_backtrace) from [<81b514ac>] (sys_info+0x68/0xa8 lib/sys_info.c:165) [<81b51444>] (sys_info) from [<8038f988>] (check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]) [<81b51444>] (sys_info) from [<8038f988>] (watchdog+0x3a0/0x848 kernel/hung_task.c:561) r5:00007ee1 r4:0000000a [<8038f5e8>] (watchdog) from [<80281710>] (kthread+0x11c/0x154 kernel/kthread.c:436) r10:00000000 r9:df819e60 r8:83111180 r7:00000000 r6:8038f5e8 r5:83178000 r4:83880800 [<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 r4:83880800