rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (1 GPs behind) idle=43ec/1/0x4000000000000000 softirq=6856/6858 fqs=3 rcu: (detected by 0, t=10505 jiffies, g=8145, q=149 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 5082 Comm: syz-executor243 Not tainted 6.7.0-rc7-syzkaller-00003-gfbafc3e621c3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 RIP: 0010:check_preemption_disabled+0x27/0xe0 lib/smp_processor_id.c:56 Code: 0f 1f 00 41 54 55 53 48 83 ec 08 65 8b 1d 2d cc 83 75 65 8b 05 22 cc 83 75 a9 ff ff ff 7f 74 0b 48 83 c4 08 89 d8 5b 5d 41 5c 9c 58 f6 c4 02 74 ee 65 48 8b 04 25 c0 bc 03 00 f6 40 2f 04 48 RSP: 0018:ffffc900001f0c18 EFLAGS: 00000096 RAX: 0000000000000001 RBX: 1ffff9200003e189 RCX: ffffffff81680477 RDX: fffffbfff1e3276b RSI: ffffffff8b2efba0 RDI: ffffffff8b2efbe0 RBP: 0000000000000001 R08: 0000000000000000 R09: fffffbfff1e3276a R10: ffffffff8f193b57 R11: 0000000000000001 R12: 0000000000000001 R13: 0000000000000000 R14: ffffffff92a6cfc0 R15: 0000000000000000 FS: 0000555556dc5380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffff79a3c88 CR3: 000000007c133000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline] rcu_is_watching+0x12/0xb0 kernel/rcu/tree.c:700 trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x464/0x520 kernel/locking/lockdep.c:5725 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162 debug_object_deactivate lib/debugobjects.c:783 [inline] debug_object_deactivate+0x113/0x320 lib/debugobjects.c:771 debug_hrtimer_deactivate kernel/time/hrtimer.c:427 [inline] debug_deactivate kernel/time/hrtimer.c:483 [inline] __run_hrtimer kernel/time/hrtimer.c:1656 [inline] __hrtimer_run_queues+0x470/0xc20 kernel/time/hrtimer.c:1752 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline] __sysvec_apic_timer_interrupt+0x105/0x400 arch/x86/kernel/apic/apic.c:1082 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:649 RIP: 0010:__raw_write_unlock_irq include/linux/rwlock_api_smp.h:274 [inline] RIP: 0010:_raw_write_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:358 Code: 90 f3 0f 1e fa 53 48 8b 74 24 08 48 89 fb 48 83 c7 18 e8 4a 87 e4 f6 48 89 df e8 82 08 e5 f6 e8 5d ba 0a f7 fb bf 01 00 00 00 f2 b7 d6 f6 65 8b 05 23 4f 80 75 85 c0 74 02 5b c3 e8 f0 12 7d RSP: 0018:ffffc90003a6f9f0 EFLAGS: 00000202 RAX: 00000000000415a1 RBX: ffffffff8cc0a080 RCX: 1ffffffff1e32119 RDX: 0000000000000000 RSI: ffffffff8accaec0 RDI: 0000000000000001 RBP: ffff88802082bb80 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8f193b57 R11: 0000000000000001 R12: 1ffff9200074df4b R13: ffff8880269faa58 R14: ffff88823bdc6740 R15: ffff8880269fa890 release_task+0xe50/0x1b10 kernel/exit.c:278 wait_task_zombie kernel/exit.c:1184 [inline] wait_consider_task+0x17c4/0x40a0 kernel/exit.c:1411 do_wait_thread kernel/exit.c:1474 [inline] __do_wait+0x1e3/0x890 kernel/exit.c:1592 do_wait+0x212/0x530 kernel/exit.c:1626 kernel_wait4+0x16d/0x280 kernel/exit.c:1785 __do_sys_wait4+0x15b/0x170 kernel/exit.c:1813 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f8c603ac893 Code: fe ff e9 41 ff ff ff 31 c9 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 80 3d 11 f8 07 00 00 49 89 ca 74 14 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5d c3 0f 1f 40 00 48 83 ec 28 89 54 24 14 48 RSP: 002b:00007ffff79a3d88 EFLAGS: 00000202 ORIG_RAX: 000000000000003d RAX: ffffffffffffffda RBX: 0000000000000148 RCX: 00007f8c603ac893 RDX: 0000000040000001 RSI: 00007ffff79a3dac RDI: 00000000ffffffff RBP: 00000000000f4240 R08: 000000000000007e R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffff79a3de0 R13: 000000000001ef52 R14: 00007ffff79a3dac R15: 0000000000000003 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.371 msecs rcu: rcu_preempt kthread starved for 10490 jiffies! g8145 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 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: CPU: 0 PID: 2812 Comm: kworker/u4:7 Not tainted 6.7.0-rc7-syzkaller-00003-gfbafc3e621c3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:__sanitizer_cov_trace_pc+0x59/0x60 kernel/kcov.c:225 Code: 82 d8 15 00 00 83 f8 02 75 20 48 8b 8a e0 15 00 00 8b 92 dc 15 00 00 48 8b 01 48 83 c0 01 48 39 d0 73 07 48 89 01 48 89 34 c1 66 0f 1f 44 00 00 f3 0f 1e fa 41 57 41 56 49 89 d6 41 55 41 54 RSP: 0018:ffffc9000a6a7928 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b9941a60 RCX: ffffffff817bbab8 RDX: ffff888026bd1dc0 RSI: ffffffff817bba92 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000006 R12: ffffed101732834d R13: 0000000000000001 R14: ffff8880b9941a68 R15: ffff8880b983d8c0 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8c604302d0 CR3: 000000000cd77000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rep_nop arch/x86/include/asm/vdso/processor.h:13 [inline] cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline] csd_lock_wait kernel/smp.c:311 [inline] smp_call_function_many_cond+0x4e2/0x1550 kernel/smp.c:855 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1023 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2016 [inline] text_poke_bp_batch+0x22b/0x750 arch/x86/kernel/alternative.c:2226 text_poke_flush arch/x86/kernel/alternative.c:2417 [inline] text_poke_flush arch/x86/kernel/alternative.c:2414 [inline] text_poke_finish+0x30/0x40 arch/x86/kernel/alternative.c:2424 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 jump_label_update+0x1d7/0x400 kernel/jump_label.c:829 static_key_enable_cpuslocked+0x1b7/0x270 kernel/jump_label.c:205 static_key_enable+0x1a/0x20 kernel/jump_label.c:218 toggle_allocation_gate mm/kfence/core.c:830 [inline] toggle_allocation_gate+0xf4/0x250 mm/kfence/core.c:822 process_one_work+0x886/0x15d0 kernel/workqueue.c:2627 process_scheduled_works kernel/workqueue.c:2700 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2781 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