rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5839/1:b..l rcu: (detected by 0, t=10502 jiffies, g=11081, q=468 ncpus=2) task:syz-executor.4 state:R running task stack:21952 pid:5839 tgid:5835 ppid:5099 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5408 [inline] __schedule+0x1796/0x49d0 kernel/sched/core.c:6745 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7067 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:stack_trace_consume_entry+0x133/0x280 kernel/stacktrace.c:95 Code: 89 f9 4c 89 ee 4c 89 f2 48 89 33 41 8b 19 41 0f b6 04 14 84 c0 0f 85 34 01 00 00 3b 5d 00 0f 92 c0 48 83 c4 18 5b 41 5c 41 5d <41> 5e 41 5f 5d c3 cc cc cc cc 44 89 c9 80 e1 07 80 c1 03 38 c1 0f RSP: 0018:ffffc90012a7f0e0 EFLAGS: 00000282 RAX: 0000000000000001 RBX: ffffffff81e4d2b2 RCX: ffff888029d51e00 RDX: dffffc0000000000 RSI: ffffffff81e4d2b2 RDI: ffffc90012a7f1ec RBP: ffffc90012a7f1e8 R08: 0000000000000006 R09: ffffc90012a7f1f0 R10: 0000000000000003 R11: ffffffff8181df60 R12: ffff888029d51e00 R13: ffffffff8181df60 R14: 0000000000000007 R15: 1ffff9200254fe3e arch_stack_walk+0x143/0x1b0 arch/x86/kernel/stacktrace.c:27 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 save_stack+0xfb/0x1f0 mm/page_owner.c:156 __reset_page_owner+0x75/0x3f0 mm/page_owner.c:297 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1088 [inline] free_unref_folios+0xf12/0x19c0 mm/page_alloc.c:2632 folios_put_refs+0x93a/0xa60 mm/swap.c:1024 free_pages_and_swap_cache+0x2ea/0x690 mm/swap_state.c:329 __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:366 [inline] tlb_flush_mmu+0x3a3/0x680 mm/mmu_gather.c:373 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:465 unmap_region+0x2df/0x350 mm/mmap.c:2370 do_vmi_align_munmap+0x1122/0x18c0 mm/mmap.c:2683 do_vmi_munmap+0x261/0x2f0 mm/mmap.c:2759 __vm_munmap+0x1fc/0x400 mm/mmap.c:3038 __do_sys_munmap mm/mmap.c:3055 [inline] __se_sys_munmap mm/mmap.c:3052 [inline] __x64_sys_munmap+0x68/0x80 mm/mmap.c:3052 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: 0033:0x7f85c227cf37 RSP: 002b:00007f85c2f47ea8 EFLAGS: 00000246 ORIG_RAX: 000000000000000b RAX: ffffffffffffffda RBX: 0000000001000000 RCX: 00007f85c227cf37 RDX: 0000000000000000 RSI: 0000000008400000 RDI: 00007f85b8000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000000096da R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000003 R13: 00007f85c2f47f80 R14: 00007f85c2f47f40 R15: 00007f85b8000000 rcu: rcu_preempt kthread starved for 10510 jiffies! g11081 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:26576 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5408 [inline] __schedule+0x1796/0x49d0 kernel/sched/core.c:6745 __schedule_loop kernel/sched/core.c:6822 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6837 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2000 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2202 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 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:86 [inline] NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:112