rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=422c/1/0x4000000000000000 softirq=12443/12443 fqs=0
rcu: 	(detected by 1, t=10505 jiffies, g=11517, q=52 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 9 Comm: kworker/0:1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: events reg_todo
RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1718 [inline]
RIP: 0010:__hrtimer_run_queues+0x2b7/0xc40 kernel/time/hrtimer.c:1814
Code: ff ff e8 0c c4 f1 08 89 c3 31 ff 89 c6 e8 a1 de 0f 00 85 db 0f 84 56 04 00 00 e8 e4 da 0f 00 eb 05 e8 dd da 0f 00 48 8b 1c 24 <4c> 89 e7 e8 41 32 00 00 48 8b 44 24 38 42 80 3c 28 00 74 08 48 89
RSP: 0018:ffffc90000007d40 EFLAGS: 00000006
RAX: ffffffff8175b5dc RBX: ffff8880b8e2b848 RCX: ffff888019e78000
RDX: 0000000000010000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000007e90 R08: ffff88802d8de357 R09: 0000000000000000
R10: ffff88802d8de340 R11: ffffed1005b1bc6b R12: ffff88802d8de340
R13: dffffc0000000000 R14: 18901bf39c000000 R15: ffff8880b8e2b800
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f06db1ef432 CR3: 000000000cb30000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1876
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
 __sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__sanitizer_cov_trace_cmp4+0x0/0x90 kernel/kcov.c:287
Code: c0 4c 89 01 48 c7 44 11 08 02 00 00 00 48 89 7c 11 10 48 89 74 11 18 48 89 44 11 20 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 15 70 23 7e 7e 65 8b 0d 71 23 7e
RSP: 0018:ffffc900000e7490 EFLAGS: 00000297
RAX: ffffffff8f6861b2 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff888019e78000 RSI: 00000000001ad203 RDI: 00000000001ad20d
RBP: 00000000001ad20d R08: ffffc900000e7630 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000000 R12: ffffc900000e7568
R13: 00000000001ad203 R14: ffffc900000e759d R15: 000000000009536d
 __orc_find arch/x86/kernel/unwind_orc.c:90 [inline]
 orc_find arch/x86/kernel/unwind_orc.c:227 [inline]
 unwind_next_frame+0x2b2/0x2970 arch/x86/kernel/unwind_orc.c:494
 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:198 [inline]
 __do_kmalloc_node mm/slab_common.c:1007 [inline]
 __kmalloc+0xb4/0x240 mm/slab_common.c:1020
 kmalloc include/linux/slab.h:604 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 kobject_get_path+0xc3/0x2c0 lib/kobject.c:161
 kobject_uevent_env+0x28a/0x8c0 lib/kobject_uevent.c:544
 call_crda net/wireless/reg.c:584 [inline]
 reg_query_database+0x2e5/0x500 net/wireless/reg.c:1127
 reg_process_hint_core net/wireless/reg.c:2671 [inline]
 reg_process_hint+0x151/0xfb0 net/wireless/reg.c:3014
 reg_process_pending_hints net/wireless/reg.c:3102 [inline]
 reg_todo+0x336/0x990 net/wireless/reg.c:3193
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10504 jiffies! g11517 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=3585
rcu: rcu_preempt kthread starved for 10505 jiffies! g11517 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:26568 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
 schedule+0xbd/0x170 kernel/sched/core.c:6773
 schedule_timeout+0x160/0x280 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 9 Comm: kworker/0:1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: events reg_todo
RIP: 0010:arch_atomic_try_cmpxchg arch/x86/include/asm/atomic.h:115 [inline]
RIP: 0010:raw_atomic_try_cmpxchg_acquire include/linux/atomic/atomic-arch-fallback.h:2151 [inline]
RIP: 0010:atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1296 [inline]
RIP: 0010:queued_spin_lock include/asm-generic/qspinlock.h:111 [inline]
RIP: 0010:do_raw_spin_lock+0x12e/0x2c0 kernel/locking/spinlock_debug.c:115
Code: 00 48 89 df be 04 00 00 00 e8 ce b6 74 00 48 8d 7c 24 40 be 04 00 00 00 e8 bf b6 74 00 8b 44 24 40 b9 01 00 00 00 f0 0f b1 0b <0f> 85 d9 00 00 00 65 8b 1d e1 6b 9b 7e 48 b9 00 00 00 00 00 fc ff
RSP: 0018:ffffc90000007b60 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffffff971153a8 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90000007ba0
RBP: ffffc90000007c10 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f74 R12: ffffffff971153b8
R13: ffffffff971153b0 R14: 1ffffffff2e22a77 R15: 1ffffffff2e22a76
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f06db1ef432 CR3: 000000000cb30000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
 _raw_spin_lock_irqsave+0xb4/0xf0 kernel/locking/spinlock.c:162
 debug_object_deactivate+0x67/0x350 lib/debugobjects.c:764
 debug_hrtimer_deactivate kernel/time/hrtimer.c:455 [inline]
 debug_deactivate+0x1d/0x1d0 kernel/time/hrtimer.c:511
 __run_hrtimer kernel/time/hrtimer.c:1718 [inline]
 __hrtimer_run_queues+0x2bf/0xc40 kernel/time/hrtimer.c:1814
 hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1876
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
 __sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__sanitizer_cov_trace_cmp4+0x0/0x90 kernel/kcov.c:287
Code: c0 4c 89 01 48 c7 44 11 08 02 00 00 00 48 89 7c 11 10 48 89 74 11 18 48 89 44 11 20 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 15 70 23 7e 7e 65 8b 0d 71 23 7e
RSP: 0018:ffffc900000e7490 EFLAGS: 00000297
RAX: ffffffff8f6861b2 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff888019e78000 RSI: 00000000001ad203 RDI: 00000000001ad20d
RBP: 00000000001ad20d R08: ffffc900000e7630 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000000 R12: ffffc900000e7568
R13: 00000000001ad203 R14: ffffc900000e759d R15: 000000000009536d
 __orc_find arch/x86/kernel/unwind_orc.c:90 [inline]
 orc_find arch/x86/kernel/unwind_orc.c:227 [inline]
 unwind_next_frame+0x2b2/0x2970 arch/x86/kernel/unwind_orc.c:494
 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:198 [inline]
 __do_kmalloc_node mm/slab_common.c:1007 [inline]
 __kmalloc+0xb4/0x240 mm/slab_common.c:1020
 kmalloc include/linux/slab.h:604 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 kobject_get_path+0xc3/0x2c0 lib/kobject.c:161
 kobject_uevent_env+0x28a/0x8c0 lib/kobject_uevent.c:544
 call_crda net/wireless/reg.c:584 [inline]
 reg_query_database+0x2e5/0x500 net/wireless/reg.c:1127
 reg_process_hint_core net/wireless/reg.c:2671 [inline]
 reg_process_hint+0x151/0xfb0 net/wireless/reg.c:3014
 reg_process_pending_hints net/wireless/reg.c:3102 [inline]
 reg_todo+0x336/0x990 net/wireless/reg.c:3193
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>