rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=740c/1/0x4000000000000000 softirq=18704/18705 fqs=2
rcu: 	(detected by 0, t=10506 jiffies, g=12237, q=92 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6189 Comm: dhcpcd-run-hook Not tainted 6.15.0-rc5-syzkaller-g01f95500a162 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
RIP: 0010:_raw_spin_lock_irqsave+0x22/0xf0 kernel/locking/spinlock.c:161
Code: 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 48 89 e5 41 57 41 56 41 54 53 48 83 e4 e0 48 83 ec 60 48 89 fb 65 48 8b 05 9e a8 1c 07 <48> 89 44 24 48 48 c7 04 24 b3 8a b5 41 48 c7 44 24 08 f7 47 7c 8d
RSP: 0018:ffffc90000a08be0 EFLAGS: 00000082
RAX: f051a913301b8100 RBX: ffffffff99a630b0 RCX: 0000000000010568
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffffff99a630b0
RBP: ffffc90000a08c78 R08: ffffc90000a08caf R09: ffffc90000a08ca0
R10: dffffc0000000000 R11: fffff52000141196 R12: dffffc0000000000
R13: dffffc0000000000 R14: dffffc0000000000 R15: ffff8880b89277c0
FS:  0000000000000000(0000) GS:ffff8881261cb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1bdaf89d58 CR3: 000000007f86f000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 debug_object_activate+0xbb/0x420 lib/debugobjects.c:818
 debug_hrtimer_activate kernel/time/hrtimer.c:445 [inline]
 debug_activate kernel/time/hrtimer.c:484 [inline]
 enqueue_hrtimer+0x30/0x3a0 kernel/time/hrtimer.c:1088
 __run_hrtimer kernel/time/hrtimer.c:1778 [inline]
 __hrtimer_run_queues+0x656/0xc60 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 cb a2 6e f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> f3 24 38 f6 65 8b 05 5c a5 1c 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc9000492f4e0 EFLAGS: 00000206
RAX: f051a913301b8100 RBX: 0000000000000212 RCX: f051a913301b8100
RDX: 0000000000000006 RSI: ffffffff8d74aaa7 RDI: 0000000000000001
RBP: ffffc9000492f570 R08: ffffffff8f7ed977 R09: 1ffffffff1efdb2e
R10: dffffc0000000000 R11: fffffbfff1efdb2f R12: dffffc0000000000
R13: 1ffff92000925ebc R14: ffffffff99a0da18 R15: 1ffff92000925e9c
 debug_rcu_head_queue kernel/rcu/rcu.h:225 [inline]
 __call_rcu_common kernel/rcu/tree.c:3067 [inline]
 call_rcu+0xae/0x990 kernel/rcu/tree.c:3202
 slab_free_hook mm/slub.c:2344 [inline]
 slab_free mm/slub.c:4642 [inline]
 kmem_cache_free+0x301/0x3f0 mm/slub.c:4744
 exit_mmap+0x593/0xba0 mm/mmap.c:1309
 __mmput+0x118/0x420 kernel/fork.c:1379
 exec_mmap+0x6ac/0x7d0 fs/exec.c:1009
 begin_new_exec+0x129c/0x2120 fs/exec.c:1264
 load_elf_binary+0x973/0x27b0 fs/binfmt_elf.c:1001
 search_binary_handler fs/exec.c:1778 [inline]
 exec_binprm fs/exec.c:1810 [inline]
 bprm_execve+0x99c/0x1440 fs/exec.c:1862
 do_execveat_common+0x510/0x6a0 fs/exec.c:1968
 do_execve fs/exec.c:2042 [inline]
 __do_sys_execve fs/exec.c:2118 [inline]
 __se_sys_execve fs/exec.c:2113 [inline]
 __x64_sys_execve+0x94/0xb0 fs/exec.c:2113
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f617c682ef7
Code: Unable to access opcode bytes at 0x7f617c682ecd.
RSP: 002b:00007ffcf82b8648 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 0000555f822cfec0 RCX: 00007f617c682ef7
RDX: 0000555f822cff08 RSI: 0000555f822cfec0 RDI: 0000555f822cff98
RBP: 0000555f822cff98 R08: 0000555f822cff9d R09: 00007ffcf82bce93
R10: 00007f617c883088 R11: 0000000000000246 R12: 0000555f822cff08
R13: 00007f617c830904 R14: 0000555f822cff08 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10495 jiffies! g12237 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:27304 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x16e2/0x4cd0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6860
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2046
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2248
 kthread+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4e/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 3452 Comm: kworker/u8:8 Not tainted 6.15.0-rc5-syzkaller-g01f95500a162 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0xe6e/0x11c0 kernel/smp.c:885
Code: 89 ee 83 e6 01 31 ff e8 20 6d 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 cb 68 0b 00 eb 37 f3 90 43 0f b6 04 2c <84> c0 75 10 41 f7 07 01 00 00 00 74 1e e8 b0 68 0b 00 eb e5 44 89
RSP: 0018:ffffc9000c017700 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff8880b883ad40 RCX: ffff888030bd5a00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000c017860 R08: ffffffff8f7ed977 R09: 1ffffffff1efdb2e
R10: dffffc0000000000 R11: fffffbfff1efdb2f R12: 1ffff11017127e99
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880b893f4c8
FS:  0000000000000000(0000) GS:ffff8881260cb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555f822be950 CR3: 000000000dd36000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:2455 [inline]
 text_poke_bp_batch+0x319/0x940 arch/x86/kernel/alternative.c:2665
 text_poke_flush arch/x86/kernel/alternative.c:2856 [inline]
 text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2863
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 static_key_enable_cpuslocked+0x128/0x250 kernel/jump_label.c:210
 static_key_enable+0x1a/0x20 kernel/jump_label.c:223
 toggle_allocation_gate+0xad/0x240 mm/kfence/core.c:850
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4e/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>