rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10500 ticks this GP) idle=291c/1/0x4000000000000000 softirq=0/0 fqs=0 rcuc=10524 jiffies(starved)
rcu: 	(t=10500 jiffies g=25437 q=403 ncpus=2)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g25437 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=23844
rcu: rcu_preempt kthread starved for 10500 jiffies! g25437 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27064 pid:18    tgid:18    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x1480/0x50a0 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6960
 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>
CPU: 0 UID: 0 PID: 6364 Comm: kworker/u8:21 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:native_pause arch/x86/include/asm/vdso/processor.h:13 [inline]
RIP: 0010:cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline]
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xebf/0x12b0 kernel/smp.c:877
Code: 00 00 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 f8 9d 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 33 99 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
RSP: 0018:ffffc90004af7620 EFLAGS: 00000293
RAX: ffffffff81b4cac9 RBX: 1ffff1101712854d RCX: ffff88802e605ac0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90004af77a0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1db664f R12: ffff8880b8942a68
R13: dffffc0000000000 R14: ffff8880b883c8c0 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888126d01000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f41bff8 CR3: 000000000d3a8000 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_disable_cpuslocked+0xc5/0x1a0 kernel/jump_label.c:240
 static_key_disable+0x1a/0x20 kernel/jump_label.c:248
 toggle_allocation_gate+0x1a1/0x240 mm/kfence/core.c:879
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421
 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>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5803 Comm: syz-executor Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:num_possible_cpus include/linux/cpumask.h:1222 [inline]
RIP: 0010:mm_get_cid+0xab/0x130 kernel/sched/sched.h:3759
Code: 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 49 c7 c5 c8 b4 01 8d 49 c1 ed 03 bd 00 00 00 80 eb 07 44 89 f0 f7 d8 71 d4 f3 90 <43> 0f b6 44 25 00 84 c0 75 41 44 8b 3d ec 4b 6f 0b 48 89 df 4c 89
RSP: 0018:ffffc90004d57948 EFLAGS: 00000887
RAX: 0000000080000000 RBX: ffff888064ab7ed0 RCX: 1ffff110074272b4
RDX: 0000000000000002 RSI: 0000000000000002 RDI: ffff888064ab7ed0
RBP: 0000000080000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100c956fab R12: dffffc0000000000
R13: 1ffffffff1a03699 R14: 0000000080000000 R15: 0000000000000002
FS:  000055558b8e9500(0000) GS:ffff888126e01000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d3f18c2930 CR3: 000000005be5e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 mm_cid_from_cpu kernel/sched/sched.h:3820 [inline]
 mm_cid_schedin kernel/sched/sched.h:3870 [inline]
 mm_cid_switch_to kernel/sched/sched.h:3886 [inline]
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x2153/0x50a0 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6960
 do_nanosleep+0x20f/0x650 kernel/time/hrtimer.c:2116
 hrtimer_nanosleep+0x1f7/0x410 kernel/time/hrtimer.c:2163
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1398 [inline]
 __se_sys_clock_nanosleep+0x339/0x390 kernel/time/posix-timers.c:1375
 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: 0033:0x7fb9de892005
Code: Unable to access opcode bytes at 0x7fb9de891fdb.
RSP: 002b:00007ffd885d3750 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 000000000000029a RCX: 00007fb9de892005
RDX: 00007ffd885d3790 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffd885d37fc R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000001388
R13: 00000000000927c0 R14: 0000000000073161 R15: 00007ffd885d3850
 </TASK>
watchdog: BUG: soft lockup - CPU#0 stuck for 246s! [kworker/u8:21:6364]
Modules linked in:
irq event stamp: 485398
hardirqs last  enabled at (485397): [<ffffffff8ad3a00d>] irqentry_exit+0x5dd/0x660 kernel/entry/common.c:219
hardirqs last disabled at (485398): [<ffffffff8ad3887e>] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056
softirqs last  enabled at (433500): [<ffffffff81855963>] __local_bh_enable_ip+0x1b3/0x2e0 kernel/softirq.c:305
softirqs last disabled at (433494): [<ffffffff8a472251>] local_bh_disable include/linux/bottom_half.h:20 [inline]
softirqs last disabled at (433494): [<ffffffff8a472251>] spin_lock_bh include/linux/spinlock_rt.h:87 [inline]
softirqs last disabled at (433494): [<ffffffff8a472251>] ieee80211_ibss_work+0xd1/0x1090 net/mac80211/ibss.c:1651
CPU: 0 UID: 0 PID: 6364 Comm: kworker/u8:21 Not tainted syzkaller #0 PREEMPT_{RT,(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+0xec1/0x12b0 kernel/smp.c:877
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 f8 9d 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 33 99 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 17 99
RSP: 0018:ffffc90004af7620 EFLAGS: 00000293
RAX: ffffffff81b4cac9 RBX: 1ffff1101712854d RCX: ffff88802e605ac0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90004af77a0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1db664f R12: ffff8880b8942a68
R13: dffffc0000000000 R14: ffff8880b883c8c0 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888126d01000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f41bff8 CR3: 000000000d3a8000 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_disable_cpuslocked+0xc5/0x1a0 kernel/jump_label.c:240
 static_key_disable+0x1a/0x20 kernel/jump_label.c:248
 toggle_allocation_gate+0x1a1/0x240 mm/kfence/core.c:879
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421
 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>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5803 Comm: syz-executor Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:num_possible_cpus include/linux/cpumask.h:1222 [inline]
RIP: 0010:mm_get_cid+0xb1/0x130 kernel/sched/sched.h:3759
Code: 41 5f 5d c3 cc cc cc cc cc 49 c7 c5 c8 b4 01 8d 49 c1 ed 03 bd 00 00 00 80 eb 07 44 89 f0 f7 d8 71 d4 f3 90 43 0f b6 44 25 00 <84> c0 75 41 44 8b 3d ec 4b 6f 0b 48 89 df 4c 89 fe e8 c9 10 eb 02
RSP: 0018:ffffc90004d57948 EFLAGS: 00000887
RAX: 0000000000000000 RBX: ffff888064ab7ed0 RCX: 1ffff110074272b4
RDX: 0000000000000002 RSI: 0000000000000002 RDI: ffff888064ab7ed0
RBP: 0000000080000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100c956fab R12: dffffc0000000000
R13: 1ffffffff1a03699 R14: 0000000080000000 R15: 0000000000000002
FS:  000055558b8e9500(0000) GS:ffff888126e01000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d3f18c2930 CR3: 000000005be5e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 mm_cid_from_cpu kernel/sched/sched.h:3820 [inline]
 mm_cid_schedin kernel/sched/sched.h:3870 [inline]
 mm_cid_switch_to kernel/sched/sched.h:3886 [inline]
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x2153/0x50a0 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6960
 do_nanosleep+0x20f/0x650 kernel/time/hrtimer.c:2116
 hrtimer_nanosleep+0x1f7/0x410 kernel/time/hrtimer.c:2163
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1398 [inline]
 __se_sys_clock_nanosleep+0x339/0x390 kernel/time/posix-timers.c:1375
 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: 0033:0x7fb9de892005
Code: Unable to access opcode bytes at 0x7fb9de891fdb.
RSP: 002b:00007ffd885d3750 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 000000000000029a RCX: 00007fb9de892005
RDX: 00007ffd885d3790 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffd885d37fc R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000001388
R13: 00000000000927c0 R14: 0000000000073161 R15: 00007ffd885d3850
 </TASK>