INFO: rcu detected stall in ion_heap_deferred

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: rcu detected stall in ion_heap_deferred_free (2) staging				1	1303d	1303d	0/26	auto-closed as invalid on 2020/12/26 20:24

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=6237, q=104) rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294953717-4294943214), jiffies_till_next_fqs=1, root ->qsmask 0x0 ion_system_heap R running task 28712 3666 2 0x80004008 Call Trace: <IRQ> sched_show_task+0x40f/0x560 kernel/sched/core.c:5954 print_other_cpu_stall kernel/rcu/tree_stall.h:410 [inline] check_cpu_stall kernel/rcu/tree_stall.h:538 [inline] rcu_pending kernel/rcu/tree.c:2827 [inline] rcu_sched_clock_irq+0x1861/0x1ad0 kernel/rcu/tree.c:2271 update_process_times+0x12d/0x180 kernel/time/timer.c:1726 tick_sched_handle kernel/time/tick-sched.c:167 [inline] tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1310 __run_hrtimer kernel/time/hrtimer.c:1514 [inline] __hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1576 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1638 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 </IRQ> RIP: 0010:check_kcov_mode kernel/kcov.c:68 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x14/0x50 kernel/kcov.c:102 Code: 00 00 00 48 8b 3d 74 25 cd 07 48 89 de e8 64 02 3b 00 5b 5d c3 cc 48 8b 04 24 65 48 8b 0c 25 c0 1d 02 00 65 8b 15 b8 81 8b 7e <f7> c2 00 01 1f 00 75 2c 8b 91 80 13 00 00 83 fa 02 75 21 48 8b 91 RSP: 0018:ffffc9000c647968 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffffffff81487326 RBX: ffffea00024e1900 RCX: ffff88809ae44580 RDX: 0000000000000001 RSI: 00000000fffffffc RDI: ffffea00024e1900 RBP: ffffc9000c647990 R08: dffffc0000000000 R09: fffffbfff120248a R10: fffffbfff120248a R11: 0000000000000000 R12: ffff8880a7d3b820 R13: dffffc0000000000 R14: 00000000fffffffc R15: ffff88808a6055a8 free_thread_stack+0x168/0x590 kernel/fork.c:280 release_task_stack kernel/fork.c:440 [inline] put_task_stack+0xa3/0x130 kernel/fork.c:451 finish_task_switch+0x3f1/0x550 kernel/sched/core.c:3256 context_switch kernel/sched/core.c:3388 [inline] __schedule+0x9a8/0xcc0 kernel/sched/core.c:4081 preempt_schedule_common kernel/sched/core.c:4236 [inline] preempt_schedule+0xdb/0x120 kernel/sched/core.c:4261 ___preempt_schedule+0x16/0x18 arch/x86/entry/thunk_64.S:50 radix_tree_preload_end include/linux/radix-tree.h:248 [inline] new_vmap_block mm/vmalloc.c:1529 [inline] vb_alloc mm/vmalloc.c:1646 [inline] vm_map_ram+0xb61/0x2420 mm/vmalloc.c:1810 ion_heap_clear_pages drivers/staging/android/ion/ion_heap.c:102 [inline] ion_heap_sglist_zero+0x208/0x280 drivers/staging/android/ion/ion_heap.c:130 ion_heap_buffer_zero+0xed/0x110 drivers/staging/android/ion/ion_heap.c:145 ion_system_heap_free+0xa9/0x3c0 drivers/staging/android/ion/ion_system_heap.c:163 ion_buffer_destroy+0x116/0x210 drivers/staging/android/ion/ion.c:93 ion_heap_deferred_free+0x73/0x4c0 drivers/staging/android/ion/ion_heap.c:239 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 rcu: rcu_preempt kthread starved for 10531 jiffies! g6237 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29032 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x9a0/0xcc0 kernel/sched/core.c:4081 schedule+0x181/0x210 kernel/sched/core.c:4155 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1895 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline] rcu_gp_kthread+0xed8/0x1770 kernel/rcu/tree.c:1821 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352