rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P9847/1:b..l rcu: (detected by 0, t=10502 jiffies, g=35169, q=330 ncpus=2) task:udevd state:R running task stack:24072 pid:9847 tgid:9847 ppid:5192 task_flags:0x40014c flags:0x00080001 Call Trace: context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7256 irqentry_exit+0x6f/0x90 kernel/entry/common.c:211 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:rcu_read_lock include/linux/rcupdate.h:868 [inline] RIP: 0010:page_ext_get+0x42/0x2f0 mm/page_ext.c:527 Code: 46 76 ff 48 8d 1d 00 00 00 00 48 c7 c7 e0 d2 f3 8d 31 f6 31 d2 b9 02 00 00 00 45 31 c0 45 31 c9 53 e8 82 90 6c ff 48 83 c4 08 b9 47 15 09 89 c5 31 ff 89 c6 e8 0e 47 8f ff 85 ed 74 10 e8 85 RSP: 0018:ffffc900032174d0 EFLAGS: 00000292 RAX: 177444d75d920400 RBX: ffffffff8230c0f2 RCX: 177444d75d920400 RDX: 0000000000000000 RSI: ffffffff8d8f2768 RDI: ffffffff8bbf0460 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8230c0f2 R10: dffffc0000000000 R11: fffff94000345367 R12: dffffc0000000000 R13: ffffea0001a29b00 R14: ffffea0001a29b00 R15: 0000009d58b9a133 __reset_page_owner+0x28/0x1f0 mm/page_owner.c:294 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1394 [inline] free_unref_folios+0xdb3/0x14f0 mm/page_alloc.c:2963 folios_put_refs+0x584/0x670 mm/swap.c:1002 free_pages_and_swap_cache+0x277/0x520 mm/swap_state.c:355 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:397 [inline] tlb_flush_mmu+0x3a0/0x680 mm/mmu_gather.c:404 tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:497 exit_mmap+0x444/0xb40 mm/mmap.c:1293 __mmput+0x118/0x430 kernel/fork.c:1133 exit_mm+0x1da/0x2c0 kernel/exit.c:582 do_exit+0x648/0x2300 kernel/exit.c:954 do_group_exit+0x21c/0x2d0 kernel/exit.c:1107 __do_sys_exit_group kernel/exit.c:1118 [inline] __se_sys_exit_group kernel/exit.c:1116 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1116 x64_sys_call+0x21f7/0x2200 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe6d26f16c5 RSP: 002b:00007ffdc914cb28 EFLAGS: 00000256 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 000055f04bfc43b0 RCX: 00007fe6d26f16c5 RDX: 00000000000000e7 RSI: fffffffffffffe68 RDI: 0000000000000000 RBP: 000055f04bfb0910 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000256 R12: 0000000000000000 R13: 00007ffdc914cb70 R14: 0000000000000000 R15: 0000000000000000