rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5997/1:b..l (detected by 0, t=10502 jiffies, g=18325, q=19 ncpus=2) task:udevadm state:R running task stack:24496 pid:5997 ppid:4387 flags:0x00004002 Call Trace: context_switch kernel/sched/core.c:5245 [inline] __schedule+0x107f/0x4030 kernel/sched/core.c:6562 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6874 irqentry_exit+0x63/0x70 kernel/entry/common.c:439 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:unwind_next_frame+0x3/0x1fd0 arch/x86/kernel/unwind_orc.c:423 Code: 5b 41 5e 41 5f c3 89 d9 80 e1 07 80 c1 03 38 c1 7c 97 48 89 df e8 ed 4c 9a 00 eb 8d 66 2e 0f 1f 84 00 00 00 00 00 90 55 41 57 <41> 56 41 55 41 54 53 48 83 ec 70 48 89 fb 49 be 00 00 00 00 00 fc RSP: 0018:ffffc9001d81f510 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffffc9001d81f5e0 RCX: 0000000080000000 RDX: dffffc0000000000 RSI: ffffffff81c319e8 RDI: ffffc9001d81f528 RBP: ffffc9001d81f5b0 R08: ffffc9001d81f5f0 R09: 0000000000000005 R10: dffffc0000000000 R11: fffff52003b03eb1 R12: ffff888028d13c00 R13: 1ffff110051a282e R14: ffffffff8170d2e0 R15: ffffc9001d81f528 arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122 save_stack+0x121/0x230 mm/page_owner.c:127 __reset_page_owner+0x51/0x190 mm/page_owner.c:148 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1487 [inline] free_pcp_prepare mm/page_alloc.c:1537 [inline] free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414 free_unref_page_list+0xbb/0x8e0 mm/page_alloc.c:3555 release_pages+0x20d1/0x2340 mm/swap.c:1035 tlb_batch_pages_flush mm/mmu_gather.c:60 [inline] tlb_flush_mmu_free mm/mmu_gather.c:255 [inline] tlb_flush_mmu+0x105/0x220 mm/mmu_gather.c:262 tlb_finish_mmu+0xf0/0x220 mm/mmu_gather.c:394 exit_mmap+0x388/0x970 mm/mmap.c:3262 __mmput+0x118/0x3a0 kernel/fork.c:1206 exit_mm+0x24d/0x350 kernel/exit.c:566 do_exit+0x958/0x2570 kernel/exit.c:868 do_group_exit+0x229/0x2e0 kernel/exit.c:1024 __do_sys_exit_group kernel/exit.c:1035 [inline] __se_sys_exit_group kernel/exit.c:1033 [inline] __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1033 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f760a4f16c5 RSP: 002b:00007ffd33a4fcb8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f760a5f2fe8 RCX: 00007f760a4f16c5 RDX: 00000000000000e7 RSI: fffffffffffffe60 RDI: 0000000000000000 RBP: 0000000000000001 R08: 00007ffd33a4fc50 R09: 0000000000000000 R10: 00007ffd33a4fb00 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f760a5f1680 R15: 00007f760a5f3000 rcu: rcu_preempt kthread timer wakeup didn't happen for 10544 jiffies! g18325 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=10215 rcu: rcu_preempt kthread starved for 10545 jiffies! g18325 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 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:I stack:26800 pid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5245 [inline] __schedule+0x107f/0x4030 kernel/sched/core.c:6562 schedule+0xb9/0x180 kernel/sched/core.c:6638 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168 rcu_gp_fqs_loop+0x303/0x1350 kernel/rcu/tree.c:1706 rcu_gp_kthread+0x99/0x3b0 kernel/rcu/tree.c:1905 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] NMI backtrace for cpu 1 skipped: idling at default_idle+0xb/0x10 arch/x86/kernel/process.c:741