rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P26079/1:b..l P27178/1:b..l (detected by 1, t=10502 jiffies, g=369421, q=32) task:systemd-udevd state:R running task stack:26224 pid:27178 ppid: 2974 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xb72/0x1460 kernel/sched/core.c:6287 preempt_schedule_notrace+0x14d/0x190 kernel/sched/core.c:6538 preempt_schedule_notrace_thunk+0x16/0x18 trace_lock_acquire+0x177/0x190 include/trace/events/lock.h:13 lock_acquire+0xa5/0x4d0 kernel/locking/lockdep.c:5596 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:267 rcu_read_lock include/linux/rcupdate.h:687 [inline] is_bpf_text_address+0x27/0x270 kernel/bpf/core.c:706 kernel_text_address kernel/extable.c:151 [inline] __kernel_text_address+0x93/0x100 kernel/extable.c:105 unwind_get_return_address+0x48/0x80 arch/x86/kernel/unwind_orc.c:318 arch_stack_walk+0xf8/0x140 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0x11b/0x1e0 kernel/stacktrace.c:121 kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3213 [inline] slab_alloc mm/slub.c:3221 [inline] kmem_cache_alloc+0x1c3/0x300 mm/slub.c:3226 getname_flags+0xba/0x650 fs/namei.c:138 getname fs/namei.c:217 [inline] __do_sys_rename fs/namei.c:4826 [inline] __se_sys_rename fs/namei.c:4823 [inline] __x64_sys_rename+0x6a/0x90 fs/namei.c:4823 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fe275099d47 RSP: 002b:00007ffea20f6d88 EFLAGS: 00000246 ORIG_RAX: 0000000000000052 RAX: ffffffffffffffda RBX: 0000563ef0b79d80 RCX: 00007fe275099d47 RDX: 0000000000000000 RSI: 00007ffea20f6d90 RDI: 0000563ef0b751e0 RBP: 00007ffea20f6e50 R08: 0000563ef0b7af70 R09: 0000563ef0b7ae90 R10: 00007fe27629e8c0 R11: 0000000000000246 R12: 00007ffea20f6d90 R13: 0000000000000001 R14: 0000563eefb1c6cb R15: 0000000000000000 task:kworker/u4:9 state:R running task stack:23216 pid:26079 ppid: 2 flags:0x00004000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xb72/0x1460 kernel/sched/core.c:6287 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6687 irqentry_exit+0x56/0x90 kernel/entry/common.c:425 asm_sysvec_apic_timer_interrupt+0x12/0x20 RIP: 0010:trace_lock_acquire+0x6b/0x190 include/trace/events/lock.h:13 Code: 76 0c 73 21 65 83 05 1b af 9c 7e 01 48 8b 05 74 c1 63 0c e8 77 29 08 00 85 c0 74 18 65 ff 0d 04 af 9c 7e 74 49 48 83 c4 08 5b <41> 5c 41 5d 41 5e 41 5f 5d c3 e8 86 4b 95 08 85 c0 74 df 80 3d e7 RSP: 0018:ffffc90003e9f8a8 EFLAGS: 00000296 RAX: 0000000000000001 RBX: ffffffff8c91c980 RCX: 0000000080000001 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffffff8c91c980 R08: dffffc0000000000 R09: ffffed10173a64a2 R10: ffffed10173a64a2 R11: 0000000000000000 R12: 0000000000000002 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 lock_acquire+0xa5/0x4d0 kernel/locking/lockdep.c:5596 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:267 rcu_read_lock include/linux/rcupdate.h:687 [inline] inet_twsk_purge+0x11b/0x890 net/ipv4/inet_timewait_sock.c:268 ops_exit_list net/core/net_namespace.c:171 [inline] cleanup_net+0x7ec/0xc50 net/core/net_namespace.c:591 process_one_work+0x853/0x1140 kernel/workqueue.c:2297 worker_thread+0xac1/0x1320 kernel/workqueue.c:2444 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g369421 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=148660 rcu: rcu_preempt kthread starved for 10502 jiffies! g369421 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26544 pid: 14 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xb72/0x1460 kernel/sched/core.c:6287 schedule+0x14b/0x210 kernel/sched/core.c:6366 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1881 rcu_gp_fqs_loop+0x1fd/0x770 kernel/rcu/tree.c:1957 rcu_gp_kthread+0xa5/0x350 kernel/rcu/tree.c:2130 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 1 to CPUs 0: ---------------- Code disassembly (best guess): 0: 76 0c jbe 0xe 2: 73 21 jae 0x25 4: 65 83 05 1b af 9c 7e addl $0x1,%gs:0x7e9caf1b(%rip) # 0x7e9caf27 b: 01 c: 48 8b 05 74 c1 63 0c mov 0xc63c174(%rip),%rax # 0xc63c187 13: e8 77 29 08 00 callq 0x8298f 18: 85 c0 test %eax,%eax 1a: 74 18 je 0x34 1c: 65 ff 0d 04 af 9c 7e decl %gs:0x7e9caf04(%rip) # 0x7e9caf27 23: 74 49 je 0x6e 25: 48 83 c4 08 add $0x8,%rsp 29: 5b pop %rbx * 2a: 41 5c pop %r12 <-- trapping instruction 2c: 41 5d pop %r13 2e: 41 5e pop %r14 30: 41 5f pop %r15 32: 5d pop %rbp 33: c3 retq 34: e8 86 4b 95 08 callq 0x8954bbf 39: 85 c0 test %eax,%eax 3b: 74 df je 0x1c 3d: 80 .byte 0x80 3e: 3d .byte 0x3d 3f: e7 .byte 0xe7