rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 0, t=10502 jiffies, g=101701, q=117 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 10501 (4295097571-4295087070), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10502 jiffies! g101701 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:27904 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5376 [inline] __schedule+0xedb/0x5af0 kernel/sched/core.c:6688 __schedule_loop kernel/sched/core.c:6763 [inline] schedule+0xe9/0x270 kernel/sched/core.c:6778 schedule_timeout+0x137/0x290 kernel/time/timer.c:2167 rcu_gp_fqs_loop+0x1ec/0xb10 kernel/rcu/tree.c:1631 rcu_gp_kthread+0x24b/0x380 kernel/rcu/tree.c:1830 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 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: 24106 Comm: syz-executor.0 Not tainted 6.7.0-rc3-syzkaller-00014-gdf60cee26a2e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 RIP: 0010:native_apic_mem_eoi+0xd/0x10 arch/x86/include/asm/apic.h:105 Code: 08 8b 83 00 c0 5f ff 5b c3 e8 9f 67 a5 00 eb f1 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 31 c0 89 04 25 b0 c0 5f ff 66 90 f3 0f 1e fa b8 01 00 00 00 c3 66 0f 1f 44 00 00 f3 0f 1e RSP: 0018:ffffc900001f0fd0 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffffc9000aa47c58 RCX: 1ffff1101732510c RDX: dffffc0000000000 RSI: ffffffff8ac928c0 RDI: ffffffff8b2f0c00 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: ffffc900001f0ff8 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fded1b496c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd398b98000 CR3: 000000007ad76000 CR4: 0000000000350ef0 Call Trace: apic_eoi arch/x86/include/asm/apic.h:408 [inline] __sysvec_apic_timer_interrupt+0x38/0x400 arch/x86/kernel/apic/apic.c:1080 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1076 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202 Code: 90 f3 0f 1e fa 53 48 8b 74 24 08 48 89 fb 48 83 c7 18 e8 4a e7 e4 f6 48 89 df e8 b2 5e e5 f6 e8 fd 1d 0b f7 fb bf 01 00 00 00 d2 17 d7 f6 65 8b 05 a3 97 80 75 85 c0 74 02 5b c3 e8 70 5b 7d RSP: 0018:ffffc9000aa47d00 EFLAGS: 00000206 RAX: 00000000038b479f RBX: ffff888017f53780 RCX: 1ffffffff1e32121 RDX: 0000000000000000 RSI: ffffffff8accb7e0 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8f193b97 R11: 0000000000000000 R12: ffff888017f53c18 R13: 0000000000000021 R14: ffff888017f53b80 R15: 1ffff92001548faf spin_unlock_irq include/linux/spinlock.h:401 [inline] get_signal+0x1899/0x2790 kernel/signal.c:2907 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x121/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1e/0x60 kernel/entry/common.c:296 do_syscall_64+0x4d/0x110 arch/x86/entry/common.c:88 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7fded0e7cae7 Code: 14 25 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 RSP: 002b:00007fded1b490c8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 00007fded0f9bf80 RCX: 00007fded0e7cae9 RDX: 0000000000001000 RSI: 00000000200006c0 RDI: 0000000000000003 RBP: 00007fded0ec847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fded0f9bf80 R15: 00007ffe5d0d4ca8