rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 1, t=10502 jiffies, g=28381, q=58 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294968664-4294958162), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10502 jiffies! g28381 f0x2 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:27064 pid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5245 [inline] __schedule+0x142d/0x4550 kernel/sched/core.c:6558 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6870 irqentry_exit+0x53/0x80 kernel/entry/common.c:439 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653 RIP: 0010:preempt_count_sub+0x62/0x160 kernel/sched/core.c:5747 Code: c1 81 e1 ff ff ff 7f 39 d9 7c 23 81 fb fe 00 00 00 77 07 0f b6 c0 85 c0 74 55 65 8b 05 9f 0c a4 7e f7 db 65 01 1d 96 0c a4 7e <5b> 41 5e c3 e8 85 c9 d6 02 85 c0 74 f3 48 c7 c0 e8 be 73 8e 48 c1 RSP: 0018:ffffc90000157b80 EFLAGS: 00000257 RAX: 0000000000000001 RBX: 00000000ffffffff RCX: 0000000000000001 RDX: dffffc0000000000 RSI: ffffffff8aec0240 RDI: 0000000000000001 RBP: ffffc90000157cb0 R08: dffffc0000000000 R09: ffffed1017307541 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88813febd940 R13: 1ffff9200002af78 R14: dffffc0000000000 R15: dffffc0000000000 schedule+0xc9/0x180 kernel/sched/core.c:6635 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1965 rcu_gp_fqs_loop+0x2d2/0x1150 kernel/rcu/tree.c:1706 rcu_gp_kthread+0xa3/0x3b0 kernel/rcu/tree.c:1905 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 rcu: Stack dump where RCU GP kthread last ran: CPU: 1 PID: 21 Comm: ksoftirqd/1 Not tainted 6.1.94-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 RIP: 0010:finish_task_switch+0x1d3/0x810 kernel/sched/core.c:5124 Code: 2e 0b 00 48 83 c4 08 4c 89 f7 e8 98 30 00 00 e9 8f 04 00 00 4c 89 f7 e8 7b 23 36 09 e8 06 1e 32 00 fb 49 8d bc 24 f8 15 00 00 <48> 89 f8 48 c1 e8 03 49 bd 00 00 00 00 00 fc ff df 42 0f b6 04 28 RSP: 0018:ffffc900001b7b48 EFLAGS: 00000286 RAX: 46c8950f6b06c900 RBX: ffff8880b993b748 RCX: ffffffff91c95103 RDX: dffffc0000000000 RSI: ffffffff8aec0240 RDI: ffff8880127433b8 RBP: ffffc900001b7b90 R08: dffffc0000000000 R09: ffffed1017307541 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888012741dc0 R13: 1ffff110173276eb R14: ffff8880b983aa00 R15: ffff8880b993b758 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30340000 CR3: 00000000606dd000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: context_switch kernel/sched/core.c:5248 [inline] __schedule+0x1435/0x4550 kernel/sched/core.c:6558 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6727 preempt_schedule+0xd9/0xe0 kernel/sched/core.c:6751 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34 smpboot_thread_fn+0x641/0xa30 kernel/smpboot.c:163 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308