rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4549/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=32169, q=429 ncpus=2)
task:udevd           state:R  running task     stack:21632 pid:4549  tgid:4549  ppid:1      flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x1800/0x4a60 kernel/sched/core.c:6529
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6851
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:871 [inline]
RIP: 0010:sock_def_readable+0x325/0x5b0 net/core/sock.c:3377
Code: c7 c7 40 9b c6 8c be 64 03 00 00 48 c7 c2 e0 9b c6 8c e8 fe 1d 19 f8 48 c7 c7 60 75 33 8e 48 89 ee e8 df e2 18 f8 48 83 c4 08 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 cc 89 23 f8 e8 67 92 3c f8 e9 8e
RSP: 0018:ffffc90003de7910 EFLAGS: 00000292
RAX: 53af963e93ebf300 RBX: 0000000000000001 RCX: ffffc90003de7803
RDX: 0000000000000004 RSI: ffffffff8bcae720 RDI: ffffffff8c20a480
RBP: ffffffff8956ed57 R08: ffffffff8fafa82f R09: 1ffffffff1f5f505
R10: dffffc0000000000 R11: fffffbfff1f5f506 R12: 1ffff1100e86c630
R13: ffff888024f33640 R14: ffff888074363180 R15: ffff888074363060
 __netlink_sendskb net/netlink/af_netlink.c:1278 [inline]
 netlink_broadcast_deliver net/netlink/af_netlink.c:1408 [inline]
 do_one_broadcast net/netlink/af_netlink.c:1495 [inline]
 netlink_broadcast_filtered+0xe9e/0x1290 net/netlink/af_netlink.c:1540
 netlink_broadcast+0x39/0x50 net/netlink/af_netlink.c:1564
 uevent_net_broadcast_untagged lib/kobject_uevent.c:331 [inline]
 kobject_uevent_net_broadcast+0x38f/0x580 lib/kobject_uevent.c:410
 kobject_uevent_env+0x57d/0x8e0 lib/kobject_uevent.c:593
 kobject_synth_uevent+0x4ef/0xae0 lib/kobject_uevent.c:207
 uevent_store+0x24/0x60 drivers/base/core.c:2763
 kernfs_fop_write_iter+0x3a3/0x500 fs/kernfs/file.c:334
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xa74/0xc90 fs/read_write.c:590
 ksys_write+0x1a0/0x2c0 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe033516bf2
RSP: 002b:00007ffd3039c7a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00005652f6477de0 RCX: 00007fe033516bf2
RDX: 0000000000000007 RSI: 00005652f656e7c0 RDI: 000000000000000c
RBP: 0000000000000007 R08: 00005652f656e7c0 R09: 0000000000000080
R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000007
R13: 00005652f656e7c0 R14: 00007ffd3039cb88 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10470 jiffies! g32169 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:24912 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x1800/0x4a60 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6621
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2034
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2236
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:106 [inline]
NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:111