rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=68fc/1/0x4000000000000000 softirq=28356/28357 fqs=2
rcu: 	(detected by 1, t=10502 jiffies, g=23921, q=458 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 7562 Comm: modprobe Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
RIP: 0010:__kasan_check_write+0x0/0x20 mm/kasan/shadow.c:36
Code: 0c 24 89 f6 31 d2 e9 0f f3 ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 0c 24 89 f6 ba 01 00 00 00 e9 dc f2 ff ff 66 66
RSP: 0018:ffffc90000007ce0 EFLAGS: 00000086
RAX: 0000000000000000 RBX: ffffffff9bbd1d28 RCX: 0000000000000100
RDX: 00000000ffffffff RSI: 0000000000000004 RDI: ffffffff9bbd1d28
RBP: ffffffff9bbd1d30 R08: 00000000000171dd R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff92000000f9e
R13: ffffffff9bbd1d38 R14: ffff888035ece300 R15: 1ffff92000000fb6
FS:  0000000000000000(0000) GS:ffff888123b64000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f63c1627dac CR3: 000000003600f000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 instrument_atomic_read_write include/linux/instrumented.h:112 [inline]
 atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1300 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:112 [inline]
 do_raw_spin_lock+0x119/0x260 kernel/locking/spinlock_debug.c:116
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:156 [inline]
 _raw_spin_lock_irqsave+0x42/0x60 kernel/locking/spinlock.c:181
 debug_object_deactivate+0x135/0x3b0 lib/debugobjects.c:936
 debug_hrtimer_deactivate kernel/time/hrtimer.c:491 [inline]
 __run_hrtimer kernel/time/hrtimer.c:2035 [inline]
 __hrtimer_run_queues+0x2e9/0x9c0 kernel/time/hrtimer.c:2124
 hrtimer_interrupt+0x441/0xaa0 kernel/time/hrtimer.c:2243
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
 __sysvec_apic_timer_interrupt+0x109/0x470 arch/x86/kernel/apic/apic.c:1068
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:206
Code: 86 04 61 00 48 89 df 5b e9 ad e6 66 00 be 03 00 00 00 5b e9 92 a9 1d 03 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 65 48 8b 05 0c d0 7f 12 48 8b 34 24 65 48 8b 15 f0 cf
RSP: 0018:ffffc9000f4af780 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff82623239
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff88802688cb00
RBP: 0000000000000001 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 00007fa158d6f000
R13: 000000000e8ca025 R14: dffffc0000000000 R15: 00007fa158e00000
 ptep_get include/linux/pgtable.h:495 [inline]
 do_zap_pte_range mm/memory.c:1944 [inline]
 zap_pte_range mm/memory.c:2065 [inline]
 zap_pmd_range mm/memory.c:2151 [inline]
 zap_pud_range mm/memory.c:2179 [inline]
 zap_p4d_range mm/memory.c:2200 [inline]
 __zap_vma_range+0xdb7/0x48e0 mm/memory.c:2240
 unmap_vmas+0x299/0x5f0 mm/memory.c:2309
 exit_mmap+0x1ef/0xa00 mm/mmap.c:1315
 __mmput+0x12a/0x410 kernel/fork.c:1193
 mmput+0x67/0x80 kernel/fork.c:1216
 exit_mm kernel/exit.c:614 [inline]
 do_exit+0x8b1/0x2ae0 kernel/exit.c:996
 do_group_exit+0xd5/0x2a0 kernel/exit.c:1151
 __do_sys_exit_group kernel/exit.c:1162 [inline]
 __se_sys_exit_group kernel/exit.c:1160 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1160
 x64_sys_call+0x1567/0x1570 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa158e146c5
Code: Unable to access opcode bytes at 0x7fa158e1469b.
RSP: 002b:00007ffd1b2419d8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fa158f15fe8 RCX: 00007fa158e146c5
RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000001
RBP: 0000000000000001 R08: 00007ffd1b241968 R09: 0000000000000000
R10: 00007ffd1b241800 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fa158f14680 R15: 00007fa158f16000
 </TASK>
rcu: rcu_preempt kthread starved for 10498 jiffies! g23921 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:27560 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5520 [inline]
 __schedule+0x1259/0x6920 kernel/sched/core.c:7270
 __schedule_loop kernel/sched/core.c:7347 [inline]
 schedule+0xdd/0x2c0 kernel/sched/core.c:7362
 schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1a9/0x8f0 kernel/rcu/tree.c:2122
 rcu_gp_kthread+0x17a/0x220 kernel/rcu/tree.c:2330
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 3984 Comm: kworker/u8:9 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:get_current arch/x86/include/asm/current.h:23 [inline]
RIP: 0010:write_comp_data+0x11/0xa0 kernel/kcov.c:241
Code: 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 65 48 8b 05 70 d7 7f 12 49 89 f8 49 89 d2 49 89 f1 <65> 48 8b 3d 4f d7 7f 12 48 63 d0 a9 00 01 00 ff 74 1e f6 c4 01 74
RSP: 0018:ffffc9000f7af898 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffff8880b8443e00 RCX: ffffffff81ff2d0b
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffff8880b8443e08 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003
R13: ffffed10170887c1 R14: 0000000000000001 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888123c64000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2644ae CR3: 000000000eb96000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 csd_lock_wait kernel/smp.c:363 [inline]
 csd_lock kernel/smp.c:396 [inline]
 smp_call_function_many_cond+0x59b/0x18c0 kernel/smp.c:944
 on_each_cpu include/linux/smp.h:71 [inline]
 smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2602 [inline]
 smp_text_poke_batch_finish+0x337/0xc60 arch/x86/kernel/alternative.c:2812
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 jump_label_update+0x37a/0x550 kernel/jump_label.c:910
 static_key_enable_cpuslocked+0x1bc/0x270 kernel/jump_label.c:210
 static_key_enable+0x1a/0x20 kernel/jump_label.c:223
 toggle_allocation_gate mm/kfence/core.c:902 [inline]
 toggle_allocation_gate+0xfe/0x2d0 mm/kfence/core.c:894
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
 process_scheduled_works kernel/workqueue.c:3479 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>