rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=3697, q=9) rcu: All QSes seen, last rcu_preempt kthread activity 10498 (4294965880-4294955382), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10498 jiffies! g3697 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:25984 pid: 15 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5026 [inline] __schedule+0x12c4/0x4590 kernel/sched/core.c:6372 schedule+0x11b/0x1f0 kernel/sched/core.c:6455 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1884 rcu_gp_fqs_loop+0x2af/0xf70 kernel/rcu/tree.c:1959 rcu_gp_kthread+0xa4/0x360 kernel/rcu/tree.c:2132 kthread+0x3f6/0x4f0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3553 Comm: syz-executor143 Not tainted 5.15.131-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 RIP: 0010:irqtime_account_irq+0x12b/0x1e0 Code: 89 df e8 e8 0e 70 00 48 8b 03 4a 8d 9c f8 b0 76 02 00 48 89 d8 48 c1 e8 03 80 3c 28 00 74 08 48 89 df e8 c8 0e 70 00 4c 01 33 <4c> 89 e0 48 c1 e8 03 80 3c 28 00 74 08 4c 89 e7 e8 b0 0e 70 00 4d RSP: 0018:ffffc90000dd0f00 EFLAGS: 00000016 RAX: 1ffff11017364eda RBX: ffff8880b9b276d0 RCX: 1ffffffff1ebb608 RDX: 1ffffffff1ebb608 RSI: ffffffff8ad878e0 RDI: ffffffff8ad878a0 RBP: dffffc0000000000 R08: ffffffff8f5db040 R09: ffffffff8f5db048 R10: ffffffff8f5db058 R11: ffffffff8f5db050 R12: ffff8880b9b27740 R13: ffff8880b9b27750 R14: 0000000000002ccd R15: 0000000000000004 FS: 00005555558ca3c0(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002006b000 CR3: 000000001a53e000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: account_hardirq_exit include/linux/vtime.h:159 [inline] __irq_exit_rcu+0xb8/0x240 kernel/softirq.c:634 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202 Code: 21 7e f6 ff 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 be 77 3c f7 48 89 df e8 16 cb 3d f7 e8 11 6a 60 f7 fb bf 01 00 00 00 46 08 31 f7 65 8b 05 27 45 dc 75 85 c0 74 02 5b c3 e8 b4 5c da RSP: 0018:ffffc90002d9fbc0 EFLAGS: 00000282 RAX: f3abadd24cf80500 RBX: ffff88807883ca00 RCX: ffffffff913d0003 RDX: dffffc0000000000 RSI: ffffffff8a8b0ce0 RDI: 0000000000000001 RBP: 0000000000000000 R08: ffffffff818694d0 R09: ffffed100f107941 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000021 R13: dffffc0000000000 R14: ffff88807883ce98 R15: ffff88807883ca00 spin_unlock_irq include/linux/spinlock.h:413 [inline] get_signal+0x13ee/0x14e0 kernel/signal.c:2892 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x5d/0x250 kernel/entry/common.c:301 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fe39c939e79 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc452af488 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007fe39c939e79 RDX: 000000002006b000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00000000000f4240 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00005555558ca370 R13: 0000000000000005 R14: 00007ffc452af500 R15: 00007ffc452af4f0 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.264 msecs