rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=fe2c/1/0x4000000000000000 softirq=30493/30494 fqs=2
rcu: 	(detected by 1, t=10506 jiffies, g=49209, q=60 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6834 Comm: syz.0.243 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:_find_first_zero_bit+0x12/0xb0 lib/find_bit.c:-1
Code: 79 ff ff ff 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 41 55 41 54 53 48 85 f6 74 46 <48> 89 f3 49 89 fe 49 bc 00 00 00 00 00 fc ff df 48 89 f8 48 c1 e8
RSP: 0018:ffffc90000117c48 EFLAGS: 00000002
RAX: 0000000000000000 RBX: 0000000000000002 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff88807a8c3050
RBP: ffff88807a8c3050 R08: 1ffff1100f5184d1 R09: 0000000000000000
R10: ffff88807a8c27d4 R11: ffff88807a8c2690 R12: 0000000080000000
R13: 1ffffffff1b76e9b R14: 0000000000000002 R15: ffff88807a8c2580
FS:  00007f0a5e3c06c0(0000) GS:ffff888125c2a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0a5e39fd58 CR3: 000000007bac4000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 find_first_zero_bit include/linux/find.h:393 [inline]
 __mm_get_cid kernel/sched/sched.h:3719 [inline]
 mm_get_cid kernel/sched/sched.h:3734 [inline]
 sched_mm_cid_fork+0x31d/0xc30 kernel/sched/core.c:10583
 bprm_execve+0xd88/0x1400 fs/exec.c:1776
 do_execveat_common+0x510/0x6a0 fs/exec.c:1859
 do_execveat fs/exec.c:1944 [inline]
 __do_sys_execveat fs/exec.c:2018 [inline]
 __se_sys_execveat fs/exec.c:2012 [inline]
 __x64_sys_execveat+0xc4/0xe0 fs/exec.c:2012
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0a5d58f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0a5e3c0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000142
RAX: ffffffffffffffda RBX: 00007f0a5d7e5fa0 RCX: 00007f0a5d58f749
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000004
RBP: 00007f0a5d613f91 R08: 0000000000001000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0a5d7e6038 R14: 00007f0a5d7e5fa0 R15: 00007ffd38bc34c8
 </TASK>
rcu: rcu_preempt kthread starved for 10495 jiffies! g49209 f0x0 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:27728 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5258 [inline]
 __schedule+0x150e/0x5070 kernel/sched/core.c:6866
 __schedule_loop kernel/sched/core.c:6948 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6963
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 4456 Comm: kworker/u8:12 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xccf/0x12b0 kernel/smp.c:877
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 8a b4 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 35 b0 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 19 b0
RSP: 0018:ffffc9000d727660 EFLAGS: 00000293
RAX: ffffffff81b62077 RBX: 1ffff110170c85d1 RCX: ffff8880332c0000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000d7277e0 R08: ffffffff8fa21a77 R09: 1ffffffff1f4434e
R10: dffffc0000000000 R11: fffffbfff1f4434f R12: ffff8880b8642e88
R13: dffffc0000000000 R14: ffff8880b873bd40 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888125d2a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0a5e39ef98 CR3: 000000000df38000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043
 on_each_cpu include/linux/smp.h:71 [inline]
 smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2711 [inline]
 smp_text_poke_batch_finish+0x5f9/0x1130 arch/x86/kernel/alternative.c:2921
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 static_key_enable_cpuslocked+0x128/0x240 kernel/jump_label.c:210
 static_key_enable+0x1a/0x20 kernel/jump_label.c:223
 toggle_allocation_gate+0xad/0x240 mm/kfence/core.c:874
 process_one_work+0x93a/0x15a0 kernel/workqueue.c:3279
 process_scheduled_works kernel/workqueue.c:3362 [inline]
 worker_thread+0x9b0/0xee0 kernel/workqueue.c:3443
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>