rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5236/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=15241, q=209 ncpus=2)
task:udevd           state:R  running task     stack:22272 pid:5236  tgid:5236  ppid:4674   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x17ae/0x4a10 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:get_current arch/x86/include/asm/current.h:49 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216
Code: 8b 3d 0c 4b 9b 0c 48 89 de 5b e9 e3 76 58 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0c 25 40 d4 03 00 65 8b 15 f0 0c 70 7e 81 e2 00 01 ff 00
RSP: 0018:ffffc90003d67a00 EFLAGS: 00000202
RAX: ffffffff81a279f6 RBX: 0000000000000001 RCX: ffff88801e77da00
RDX: ffff88801e77da00 RSI: ffffffff8c5fda60 RDI: ffffffff8c5fda20
RBP: 0000000000000000 R08: ffffffff81a279e4 R09: 1ffffffff2841910
R10: dffffc0000000000 R11: fffffbfff2841911 R12: ffffffffa0001f9c
R13: dffffc0000000000 R14: 0000000000000000 R15: 00007f666bd1a37f
 rcu_read_unlock include/linux/rcupdate.h:878 [inline]
 is_bpf_text_address+0x206/0x2a0 kernel/bpf/core.c:769
 kernel_text_address+0xa7/0xe0 kernel/extable.c:125
 __kernel_text_address+0xd/0x40 kernel/extable.c:79
 unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:369
 arch_stack_walk+0xfd/0x150 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
 kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47
 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541
 slab_free_hook mm/slub.c:2304 [inline]
 slab_free mm/slub.c:4580 [inline]
 kmem_cache_free+0x2ea/0x420 mm/slub.c:4682
 __do_sys_close fs/open.c:1565 [inline]
 __se_sys_close fs/open.c:1550 [inline]
 __x64_sys_close+0x7f/0x110 fs/open.c:1550
 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: 0033:0x7f666bd1a37f
RSP: 002b:00007ffe178e7778 EFLAGS: 00000202 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 000055aabef01be0 RCX: 00007f666bd1a37f
RDX: 00007f666bded860 RSI: 000055aabeef8930 RDI: 0000000000000008
RBP: 0000000000000000 R08: 0000000000000008 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000202 R12: 0000000000000000
R13: 000055aa8b658100 R14: 00007ffe178e7bc8 R15: 000055aa8b66d160
 </TASK>
rcu: rcu_preempt kthread starved for 10533 jiffies! g15241 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:26352 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x17ae/0x4a10 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:2615
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/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 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:106 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:111