INFO: task kworker/0:29:4663 blocked for more than 430 seconds. Not tainted 6.11.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:29 state:D stack:0 pid:4663 tgid:4663 ppid:2 flags:0x00000000 Workqueue: events bpf_prog_free_deferred Call trace: [<8197ecc8>] (__schedule) from [<8197f860>] (__schedule_loop kernel/sched/core.c:6606 [inline]) [<8197ecc8>] (__schedule) from [<8197f860>] (schedule+0x2c/0xfc kernel/sched/core.c:6621) r10:8260ca7c r9:00000000 r8:82714ab8 r7:00000002 r6:dfe59da4 r5:84e53c00 r4:84e53c00 [<8197f834>] (schedule) from [<8197fc14>] (schedule_preempt_disabled+0x18/0x24 kernel/sched/core.c:6678) r5:84e53c00 r4:82714ab4 [<8197fbfc>] (schedule_preempt_disabled) from [<819826ec>] (__mutex_lock_common kernel/locking/mutex.c:684 [inline]) [<8197fbfc>] (schedule_preempt_disabled) from [<819826ec>] (__mutex_lock.constprop.0+0x2e8/0xae0 kernel/locking/mutex.c:752) [<81982404>] (__mutex_lock.constprop.0) from [<81982fb8>] (__mutex_lock_slowpath+0x14/0x18 kernel/locking/mutex.c:1040) r10:8260ca7c r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:dfe59e20 r4:00000000 [<81982fa4>] (__mutex_lock_slowpath) from [<81982ff8>] (mutex_lock+0x3c/0x40 kernel/locking/mutex.c:286) [<81982fbc>] (mutex_lock) from [<804a6490>] (_vm_unmap_aliases+0x68/0x240 mm/vmalloc.c:2846) [<804a6428>] (_vm_unmap_aliases) from [<804aa1e8>] (vm_reset_perms mm/vmalloc.c:3275 [inline]) [<804a6428>] (_vm_unmap_aliases) from [<804aa1e8>] (vfree+0x170/0x1e4 mm/vmalloc.c:3354) r10:82c16005 r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:84f8f400 r4:00000000 [<804aa078>] (vfree) from [<80501a18>] (execmem_free+0x30/0x64 mm/execmem.c:69) r9:84e53c00 r8:00800000 r7:00000000 r6:82c16000 r5:00001000 r4:7f04f000 [<805019e8>] (execmem_free) from [<80393a3c>] (bpf_jit_free_exec+0x10/0x14 kernel/bpf/core.c:1072) r5:00001000 r4:dfefd000 [<80393a2c>] (bpf_jit_free_exec) from [<80393e1c>] (bpf_jit_binary_free kernel/bpf/core.c:1118 [inline]) [<80393a2c>] (bpf_jit_free_exec) from [<80393e1c>] (bpf_jit_free+0x68/0xe4 kernel/bpf/core.c:1241) [<80393db4>] (bpf_jit_free) from [<80394f58>] (bpf_prog_free_deferred+0x14c/0x164 kernel/bpf/core.c:2800) r5:850e1b54 r4:850e1800 [<80394e0c>] (bpf_prog_free_deferred) from [<80265f08>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3231) r7:dddd0000 r6:82c16000 r5:850e1b54 r4:853a9300 [<80265d54>] (process_one_work) from [<80266aec>] (process_scheduled_works kernel/workqueue.c:3312 [inline]) [<80265d54>] (process_one_work) from [<80266aec>] (worker_thread+0x1ec/0x3b4 kernel/workqueue.c:3389) r10:84e53c00 r9:853a932c r8:61c88647 r7:dddd0020 r6:82604d40 r5:dddd0000 r4:853a9300 [<80266900>] (worker_thread) from [<8026fb04>] (kthread+0x104/0x134 kernel/kthread.c:389) r10:00000000 r9:dfcf9e78 r8:853a1780 r7:853a9300 r6:80266900 r5:84e53c00 r4:853ab380 [<8026fa00>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xdfe59fb0 to 0xdfe59ff8) 9fa0: 00000000 00000000 00000000 00000000 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:8026fa00 r4:853ab380 INFO: task kworker/0:33:5353 blocked for more than 430 seconds. Not tainted 6.11.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:33 state:D stack:0 pid:5353 tgid:5353 ppid:2 flags:0x00000000 Workqueue: events bpf_prog_free_deferred Call trace: [<8197ecc8>] (__schedule) from [<8197f860>] (__schedule_loop kernel/sched/core.c:6606 [inline]) [<8197ecc8>] (__schedule) from [<8197f860>] (schedule+0x2c/0xfc kernel/sched/core.c:6621) r10:8260ca7c r9:00000000 r8:82714ab8 r7:00000002 r6:dfd75da4 r5:84e54800 r4:84e54800 [<8197f834>] (schedule) from [<8197fc14>] (schedule_preempt_disabled+0x18/0x24 kernel/sched/core.c:6678) r5:84e54800 r4:82714ab4 [<8197fbfc>] (schedule_preempt_disabled) from [<819826ec>] (__mutex_lock_common kernel/locking/mutex.c:684 [inline]) [<8197fbfc>] (schedule_preempt_disabled) from [<819826ec>] (__mutex_lock.constprop.0+0x2e8/0xae0 kernel/locking/mutex.c:752) [<81982404>] (__mutex_lock.constprop.0) from [<81982fb8>] (__mutex_lock_slowpath+0x14/0x18 kernel/locking/mutex.c:1040) r10:8260ca7c r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:dfd75e20 r4:00000000 [<81982fa4>] (__mutex_lock_slowpath) from [<81982ff8>] (mutex_lock+0x3c/0x40 kernel/locking/mutex.c:286) [<81982fbc>] (mutex_lock) from [<804a6490>] (_vm_unmap_aliases+0x68/0x240 mm/vmalloc.c:2846) [<804a6428>] (_vm_unmap_aliases) from [<804aa1e8>] (vm_reset_perms mm/vmalloc.c:3275 [inline]) [<804a6428>] (_vm_unmap_aliases) from [<804aa1e8>] (vfree+0x170/0x1e4 mm/vmalloc.c:3354) r10:82c16005 r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:851f88c0 r4:00000000 [<804aa078>] (vfree) from [<80501a18>] (execmem_free+0x30/0x64 mm/execmem.c:69) r9:84e54800 r8:00800000 r7:00000000 r6:82c16000 r5:00001000 r4:7f051000 [<805019e8>] (execmem_free) from [<80393a3c>] (bpf_jit_free_exec+0x10/0x14 kernel/bpf/core.c:1072) r5:00001000 r4:dff27000 [<80393a2c>] (bpf_jit_free_exec) from [<80393e1c>] (bpf_jit_binary_free kernel/bpf/core.c:1118 [inline]) [<80393a2c>] (bpf_jit_free_exec) from [<80393e1c>] (bpf_jit_free+0x68/0xe4 kernel/bpf/core.c:1241) [<80393db4>] (bpf_jit_free) from [<80394f58>] (bpf_prog_free_deferred+0x14c/0x164 kernel/bpf/core.c:2800) r5:850e2f54 r4:850e2c00 [<80394e0c>] (bpf_prog_free_deferred) from [<80265f08>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3231) r7:dddd0000 r6:82c16000 r5:850e2f54 r4:8521e800 [<80265d54>] (process_one_work) from [<80266aec>] (process_scheduled_works kernel/workqueue.c:3312 [inline]) [<80265d54>] (process_one_work) from [<80266aec>] (worker_thread+0x1ec/0x3b4 kernel/workqueue.c:3389) r10:84e54800 r9:8521e82c r8:61c88647 r7:dddd0020 r6:82604d40 r5:dddd0000 r4:8521e800 [<80266900>] (worker_thread) from [<8026fb04>] (kthread+0x104/0x134 kernel/kthread.c:389) r10:00000000 r9:dfe59e78 r8:853a0900 r7:8521e800 r6:80266900 r5:84e54800 r4:853a04c0 [<8026fa00>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xdfd75fb0 to 0xdfd75ff8) 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 r5:8026fa00 r4:853a04c0 INFO: task kworker/1:43:5374 blocked for more than 430 seconds. Not tainted 6.11.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:43 state:D stack:0 pid:5374 tgid:5374 ppid:2 flags:0x00000000 Workqueue: events bpf_prog_free_deferred Call trace: [<8197ecc8>] (__schedule) from [<8197f860>] (__schedule_loop kernel/sched/core.c:6606 [inline]) [<8197ecc8>] (__schedule) from [<8197f860>] (schedule+0x2c/0xfc kernel/sched/core.c:6621) r10:8260ca7c r9:00000000 r8:82714ab8 r7:00000002 r6:dfecdda4 r5:82f3a400 r4:82f3a400 [<8197f834>] (schedule) from [<8197fc14>] (schedule_preempt_disabled+0x18/0x24 kernel/sched/core.c:6678) r5:82f3a400 r4:82714ab4 [<8197fbfc>] (schedule_preempt_disabled) from [<819826ec>] (__mutex_lock_common kernel/locking/mutex.c:684 [inline]) [<8197fbfc>] (schedule_preempt_disabled) from [<819826ec>] (__mutex_lock.constprop.0+0x2e8/0xae0 kernel/locking/mutex.c:752) [<81982404>] (__mutex_lock.constprop.0) from [<81982fb8>] (__mutex_lock_slowpath+0x14/0x18 kernel/locking/mutex.c:1040) r10:8260ca7c r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:dfecde20 r4:00000000 [<81982fa4>] (__mutex_lock_slowpath) from [<81982ff8>] (mutex_lock+0x3c/0x40 kernel/locking/mutex.c:286) [<81982fbc>] (mutex_lock) from [<804a6490>] (_vm_unmap_aliases+0x68/0x240 mm/vmalloc.c:2846) [<804a6428>] (_vm_unmap_aliases) from [<804aa1e8>] (vm_reset_perms mm/vmalloc.c:3275 [inline]) [<804a6428>] (_vm_unmap_aliases) from [<804aa1e8>] (vfree+0x170/0x1e4 mm/vmalloc.c:3354) r10:82c16205 r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:850c2f40 r4:00000000 [<804aa078>] (vfree) from [<80501a18>] (execmem_free+0x30/0x64 mm/execmem.c:69) r9:82f3a400 r8:01800000 r7:00000000 r6:82c16200 r5:00001000 r4:7f055000 [<805019e8>] (execmem_free) from [<80393a3c>] (bpf_jit_free_exec+0x10/0x14 kernel/bpf/core.c:1072) r5:00001000 r4:dff7d000 [<80393a2c>] (bpf_jit_free_exec) from [<80393e1c>] (bpf_jit_binary_free kernel/bpf/core.c:1118 [inline]) [<80393a2c>] (bpf_jit_free_exec) from [<80393e1c>] (bpf_jit_free+0x68/0xe4 kernel/bpf/core.c:1241) [<80393db4>] (bpf_jit_free) from [<80394f58>] (bpf_prog_free_deferred+0x14c/0x164 kernel/bpf/core.c:2800) r5:8410e754 r4:8410e400 [<80394e0c>] (bpf_prog_free_deferred) from [<80265f08>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3231) r7:ddde4000 r6:82c16200 r5:8410e754 r4:850c0a00 [<80265d54>] (process_one_work) from [<80266aec>] (process_scheduled_works kernel/workqueue.c:3312 [inline]) [<80265d54>] (process_one_work) from [<80266aec>] (worker_thread+0x1ec/0x3b4 kernel/workqueue.c:3389) r10:82f3a400 r9:850c0a2c r8:61c88647 r7:ddde4020 r6:82604d40 r5:ddde4000 r4:850c0a00 [<80266900>] (worker_thread) from [<8026fb04>] (kthread+0x104/0x134 kernel/kthread.c:389) r10:00000000 r9:dfe75e78 r8:85088580 r7:850c0a00 r6:80266900 r5:82f3a400 r4:850c2c40 [<8026fa00>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xdfecdfb0 to 0xdfecdff8) dfa0: 00000000 00000000 00000000 00000000 dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:8026fa00 r4:850c2c40 INFO: task kworker/1:44:5383 blocked for more than 430 seconds. Not tainted 6.11.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:44 state:D stack:0 pid:5383 tgid:5383 ppid:2 flags:0x00000000 Workqueue: events bpf_prog_free_deferred Call trace: [<8197ecc8>] (__schedule) from [<8197f860>] (__schedule_loop kernel/sched/core.c:6606 [inline]) [<8197ecc8>] (__schedule) from [<8197f860>] (schedule+0x2c/0xfc kernel/sched/core.c:6621) r10:8260ca7c r9:00000000 r8:82714ab8 r7:00000002 r6:dff31da4 r5:834a4800 r4:834a4800 [<8197f834>] (schedule) from [<8197fc14>] (schedule_preempt_disabled+0x18/0x24 kernel/sched/core.c:6678) r5:834a4800 r4:82714ab4 [<8197fbfc>] (schedule_preempt_disabled) from [<819826ec>] (__mutex_lock_common kernel/locking/mutex.c:684 [inline]) [<8197fbfc>] (schedule_preempt_disabled) from [<819826ec>] (__mutex_lock.constprop.0+0x2e8/0xae0 kernel/locking/mutex.c:752) [<81982404>] (__mutex_lock.constprop.0) from [<81982fb8>] (__mutex_lock_slowpath+0x14/0x18 kernel/locking/mutex.c:1040) r10:8260ca7c r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:dff31e20 r4:00000000 [<81982fa4>] (__mutex_lock_slowpath) from [<81982ff8>] (mutex_lock+0x3c/0x40 kernel/locking/mutex.c:286) [<81982fbc>] (mutex_lock) from [<804a6490>] (_vm_unmap_aliases+0x68/0x240 mm/vmalloc.c:2846) [<804a6428>] (_vm_unmap_aliases) from [<804aa1e8>] (vm_reset_perms mm/vmalloc.c:3275 [inline]) [<804a6428>] (_vm_unmap_aliases) from [<804aa1e8>] (vfree+0x170/0x1e4 mm/vmalloc.c:3354) r10:82c16205 r9:00000001 r8:00000000 r7:ffffffff r6:00000000 r5:850c2a40 r4:00000000 [<804aa078>] (vfree) from [<80501a18>] (execmem_free+0x30/0x64 mm/execmem.c:69) r9:834a4800 r8:01800000 r7:00000000 r6:82c16200 r5:00001000 r4:7f053000 [<805019e8>] (execmem_free) from [<80393a3c>] (bpf_jit_free_exec+0x10/0x14 kernel/bpf/core.c:1072) r5:00001000 r4:dff4b000 [<80393a2c>] (bpf_jit_free_exec) from [<80393e1c>] (bpf_jit_binary_free kernel/bpf/core.c:1118 [inline]) [<80393a2c>] (bpf_jit_free_exec) from [<80393e1c>] (bpf_jit_free+0x68/0xe4 kernel/bpf/core.c:1241) [<80393db4>] (bpf_jit_free) from [<80394f58>] (bpf_prog_free_deferred+0x14c/0x164 kernel/bpf/core.c:2800) r5:850f0754 r4:850f0400 [<80394e0c>] (bpf_prog_free_deferred) from [<80265f08>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3231) r7:ddde4000 r6:82c16200 r5:850f0754 r4:850c0900 [<80265d54>] (process_one_work) from [<80266aec>] (process_scheduled_works kernel/workqueue.c:3312 [inline]) [<80265d54>] (process_one_work) from [<80266aec>] (worker_thread+0x1ec/0x3b4 kernel/workqueue.c:3389) r10:834a4800 r9:850c092c r8:61c88647 r7:ddde4020 r6:82604d40 r5:ddde4000 r4:850c0900 [<80266900>] (worker_thread) from [<8026fb04>] (kthread+0x104/0x134 kernel/kthread.c:389) r10:00000000 r9:dfecde78 r8:851f81c0 r7:850c0900 r6:80266900 r5:834a4800 r4:850c2380 [<8026fa00>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xdff31fb0 to 0xdff31ff8) 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 r5:8026fa00 r4:850c2380 NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 32 Comm: khungtaskd Not tainted 6.11.0-rc6-syzkaller #0 Hardware name: ARM-Versatile Express Call trace: [<8195d0e0>] (dump_backtrace) from [<8195d1dc>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257) r7:00000000 r6:00000013 r5:60000093 r4:8200ca8c [<8195d1c4>] (show_stack) from [<8197af1c>] (__dump_stack lib/dump_stack.c:93 [inline]) [<8195d1c4>] (show_stack) from [<8197af1c>] (dump_stack_lvl+0x70/0x7c lib/dump_stack.c:119) [<8197aeac>] (dump_stack_lvl) from [<8197af40>] (dump_stack+0x18/0x1c lib/dump_stack.c:128) r5:00000001 r4:00000001 [<8197af28>] (dump_stack) from [<8194a3d0>] (nmi_cpu_backtrace+0x160/0x17c lib/nmi_backtrace.c:113) [<8194a270>] (nmi_cpu_backtrace) from [<8194a51c>] (nmi_trigger_cpumask_backtrace+0x130/0x1d8 lib/nmi_backtrace.c:62) r7:00000001 r6:8260c5d0 r5:8261a88c r4:ffffffff [<8194a3ec>] (nmi_trigger_cpumask_backtrace) from [<802103c8>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:851) r9:00009618 r8:828b3130 r7:8260c734 r6:00007d52 r5:8261ae48 r4:853d601c [<802103b0>] (arch_trigger_cpumask_backtrace) from [<80350e30>] (trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]) [<802103b0>] (arch_trigger_cpumask_backtrace) from [<80350e30>] (check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]) [<802103b0>] (arch_trigger_cpumask_backtrace) from [<80350e30>] (watchdog+0x498/0x5b8 kernel/hung_task.c:379) [<80350998>] (watchdog) from [<8026fb04>] (kthread+0x104/0x134 kernel/kthread.c:389) r10:00000000 r9:df819e58 r8:82f97100 r7:00000000 r6:80350998 r5:82e51800 r4:82f97000 [<8026fa00>] (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 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:8026fa00 r4:82f97000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 3102 Comm: sshd Not tainted 6.11.0-rc6-syzkaller #0 Hardware name: ARM-Versatile Express PC is at free_swap_cache+0x0/0xfc mm/swap_state.c:290 LR is at free_pages_and_swap_cache+0x98/0x13c mm/swap_state.c:325 pc : [<804c7a28>] lr : [<804c7c38>] psr: 60000013 sp : df96dc90 ip : df96dc78 fp : df96ddbc r10: 000005f4 r9 : 84ce3600 r8 : 84ce300c r7 : 00000001 r6 : 00000200 r5 : 0000017d r4 : defbd3e4 r3 : defbd3c4 r2 : df96ddb0 r1 : df96ddb0 r0 : defbd3e4 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8439bac0 DAC: fffffffd Call trace: [<804c7ba0>] (free_pages_and_swap_cache) from [<804994e0>] (__tlb_batch_free_encoded_pages+0x60/0xbc mm/mmu_gather.c:136) r10:00000000 r9:00000001 r8:82f8a778 r7:84ce3000 r6:000001ff r5:84ce380c r4:00000200 [<80499480>] (__tlb_batch_free_encoded_pages) from [<80499c1c>] (tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]) [<80499480>] (__tlb_batch_free_encoded_pages) from [<80499c1c>] (tlb_flush_mmu_free mm/mmu_gather.c:366 [inline]) [<80499480>] (__tlb_batch_free_encoded_pages) from [<80499c1c>] (tlb_flush_mmu mm/mmu_gather.c:373 [inline]) [<80499480>] (__tlb_batch_free_encoded_pages) from [<80499c1c>] (tlb_finish_mmu+0x94/0x1bc mm/mmu_gather.c:465) r7:82928744 r6:df96dec0 r5:df96dea4 r4:84ce3000 [<80499b88>] (tlb_finish_mmu) from [<80495d0c>] (exit_mmap+0x1b4/0x4f0 mm/mmap.c:3425) r6:82928748 r5:82f8a700 r4:843b47e0 [<80495b58>] (exit_mmap) from [<8023da7c>] (__mmput+0x3c/0x100 kernel/fork.c:1345) r10:000000f8 r9:00000000 r8:df96df50 r7:8369e880 r6:82f8a778 r5:82f8a700 r4:82f8a700 [<8023da40>] (__mmput) from [<8023db7c>] (mmput+0x3c/0x40 kernel/fork.c:1367) r5:82f8a700 r4:8369e000 [<8023db40>] (mmput) from [<80248f4c>] (exit_mm kernel/exit.c:571 [inline]) [<8023db40>] (mmput) from [<80248f4c>] (do_exit+0x2b8/0xaa0 kernel/exit.c:869) [<80248c94>] (do_exit) from [<802498f4>] (do_group_exit+0x40/0x8c kernel/exit.c:1031) r7:82f5b480 [<802498b4>] (do_group_exit) from [<80249958>] (__do_sys_exit_group kernel/exit.c:1042 [inline]) [<802498b4>] (do_group_exit) from [<80249958>] (pid_child_should_wake+0x0/0x6c kernel/exit.c:1040) r7:000000f8 r4:00591288 [<80249940>] (sys_exit_group) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf96dfa8 to 0xdf96dff0) dfa0: 00591288 ffffffe3 000000ff 00000000 000000ff 00591008 dfc0: 00591288 ffffffe3 000000ff 000000f8 76f10d08 00550565 7ead91a4 00000020 dfe0: 00590df0 7ead8ef8 004adb30 76ae9fd4