rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (10500 ticks this GP) idle=efe/1/0x4000000000000000 softirq=58034/58034 fqs=0 (t=10500 jiffies g=86733 q=726) rcu: rcu_preempt kthread starved for 10500 jiffies! g86733 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R running task stack:28888 pid: 13 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5078 schedule+0xcf/0x270 kernel/sched/core.c:5157 schedule_timeout+0x148/0x250 kernel/time/timer.c:1878 rcu_gp_fqs_loop kernel/rcu/tree.c:1940 [inline] rcu_gp_kthread+0xbbe/0x1d70 kernel/rcu/tree.c:2113 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 NMI backtrace for cpu 0 CPU: 0 PID: 29938 Comm: syz-executor.4 Not tainted 5.11.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x1f4/0x230 kernel/rcu/tree_stall.h:337 print_cpu_stall kernel/rcu/tree_stall.h:569 [inline] check_cpu_stall kernel/rcu/tree_stall.h:643 [inline] rcu_pending kernel/rcu/tree.c:3751 [inline] rcu_sched_clock_irq.cold+0x48e/0xedf kernel/rcu/tree.c:2580 update_process_times+0x16d/0x200 kernel/time/timer.c:1782 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1369 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1106 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline] sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629 RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:164 [inline] RIP: 0010:unwind_next_frame+0x280/0x1f90 arch/x86/kernel/unwind_orc.c:443 Code: 89 54 24 20 48 89 4c 24 18 e8 bc 1d 84 00 4c 8b 44 24 30 48 8b 74 24 28 44 8b 54 24 20 48 8b 4c 24 18 46 8b 1c 85 1c d8 d3 8e <44> 8d 46 01 48 ba 00 00 00 00 00 fc ff df 4a 8d 3c 85 1c d8 d3 8e RSP: 0018:ffffc90000007620 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 1ffff92000000ecc RCX: ffffffff81b5909a RDX: 0000000000000007 RSI: 000000000000b590 RDI: ffffffff8ed6ae5c RBP: 0000000000000002 R08: 000000000000b590 R09: 0000000000000000 R10: 0000000000084083 R11: 000000000002a254 R12: ffffc90000007740 R13: ffffc9000000772d R14: ffffc90000007748 R15: ffffc900000076f8 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:356 ____kasan_slab_free+0xe1/0x110 mm/kasan/common.c:362 kasan_slab_free include/linux/kasan.h:192 [inline] slab_free_hook mm/slub.c:1547 [inline] slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1580 slab_free mm/slub.c:3143 [inline] kfree+0xdb/0x3b0 mm/slub.c:4139 skb_free_head net/core/skbuff.c:650 [inline] skb_release_data+0x622/0x750 net/core/skbuff.c:671 skb_release_all net/core/skbuff.c:725 [inline] __kfree_skb net/core/skbuff.c:739 [inline] kfree_skb net/core/skbuff.c:757 [inline] kfree_skb+0x133/0x3f0 net/core/skbuff.c:751 kfree_skb_list+0x3f/0x60 net/core/skbuff.c:766 __dev_xmit_skb net/core/dev.c:3849 [inline] __dev_queue_xmit+0x1560/0x2e00 net/core/dev.c:4150 mrp_queue_xmit net/802/mrp.c:351 [inline] mrp_join_timer+0x8a/0xc0 net/802/mrp.c:595 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1417 expire_timers kernel/time/timer.c:1462 [inline] __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1731 __run_timers kernel/time/timer.c:1712 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1744 __do_softirq+0x29b/0x9f6 kernel/softirq.c:343 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:226 [inline] __irq_exit_rcu kernel/softirq.c:420 [inline] irq_exit_rcu+0x134/0x200 kernel/softirq.c:432 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629 RIP: 0010:qlink_to_object mm/kasan/quarantine.c:129 [inline] RIP: 0010:qlink_free mm/kasan/quarantine.c:134 [inline] RIP: 0010:qlist_free_all+0x46/0xc0 mm/kasan/quarantine.c:165 Code: 49 be 00 00 00 00 00 ea ff ff 49 89 fd 49 bc 00 00 00 00 00 fc ff df eb 2d 48 63 87 c0 00 00 00 48 c7 c2 65 22 b6 81 4c 8b 3e <48> 29 c6 48 89 f0 48 c1 e8 03 42 c6 04 20 fb e8 f6 c6 ff ff 4d 85 RSP: 0018:ffffc90017bbf9f8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff888017840ea0 RCX: ffffea0000ad19ff RDX: ffffffff81b62265 RSI: ffff88801e476280 RDI: ffff8880118c7c80 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000030 R10: ffffffff8132f03a R11: 000000000000003f R12: dffffc0000000000 R13: ffffc90017bbfa30 R14: ffffea0000000000 R15: ffff888023171000 quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272 ____kasan_kmalloc.constprop.0+0x98/0xa0 mm/kasan/common.c:412 kasan_slab_alloc include/linux/kasan.h:209 [inline] slab_post_alloc_hook mm/slab.h:512 [inline] slab_alloc_node mm/slub.c:2892 [inline] slab_alloc mm/slub.c:2900 [inline] kmem_cache_alloc+0x1c6/0x440 mm/slub.c:2905 kmem_cache_zalloc include/linux/slab.h:672 [inline] taskstats_tgid_alloc kernel/taskstats.c:561 [inline] taskstats_exit+0x649/0xbf0 kernel/taskstats.c:600 do_exit+0x69d/0x2ae0 kernel/exit.c:810 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x427/0x20f0 kernel/signal.c:2773 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x466019 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f75ed164218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000056bf68 RCX: 0000000000466019 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056bf68 RBP: 000000000056bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf6c R13: 00007fff22f934cf R14: 00007f75ed164300 R15: 0000000000022000