rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (2 ticks this GP) idle=c11/1/0x4000000000000000 softirq=10268/10268 fqs=0 
	(detected by 1, t=10502 jiffies, g=10709, q=1122)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3559 Comm: udevd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:debug_spin_unlock kernel/locking/spinlock_debug.c:99 [inline]
RIP: 0010:do_raw_spin_unlock+0x27/0x230 kernel/locking/spinlock_debug.c:140
Code: 1f 40 00 55 41 57 41 56 41 55 41 54 53 48 89 fb 49 bc 00 00 00 00 00 fc ff df 4c 8d 77 04 4c 89 f0 48 c1 e8 03 42 0f b6 04 20 <84> c0 0f 85 7f 01 00 00 41 81 3e ad 4e ad de 0f 85 ee 00 00 00 48
RSP: 0000:ffffc90000007c38 EFLAGS: 00000803
RAX: 0000000000000000 RBX: ffff88802365e2e8 RCX: 06f8e23ed23d9e00
RDX: 0000000000000001 RSI: ffffffff8a0b2ac0 RDI: ffff88802365e2e8
RBP: ffff88802365e340 R08: dffffc0000000000 R09: fffffbfff1ad32b6
R10: fffffbfff1ad32b6 R11: 1ffffffff1ad32b5 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88802365e2ec R15: 00000036c7f49d38
FS:  00007fb7368ba880(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005643284b9b18 CR3: 000000007d753000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __raw_spin_unlock include/linux/spinlock_api_smp.h:151 [inline]
 _raw_spin_unlock+0x1a/0x40 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:403 [inline]
 advance_sched+0x687/0x940 net/sched/sch_taprio.c:765
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x53d/0xc40 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:post_alloc_hook+0x0/0x220 mm/page_alloc.c:2390
Code: bf 1d 8c 4c 89 f6 e8 2f c2 48 02 eb ac 4c 89 f7 48 c7 c6 c0 9b 14 8a e8 fe 3e f8 ff 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 66 90 <55> 41 57 41 56 41 55 41 54 53 89 d5 41 89 f6 48 89 fb 49 bc 00 00
RSP: 0000:ffffc90002def798 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88813fffbc01 RCX: 0000000000000001
RDX: 0000000001100cca RSI: 0000000000000000 RDI: ffffea00019deb00
RBP: ffffc90002def9b0 R08: 0000000000001000 R09: fffffbfff1ff7a1f
R10: fffffbfff1ff7a1f R11: 1ffffffff1ff7a1e R12: ffffea00019deb00
R13: 0000000000000000 R14: 0000000001100cca R15: ffffc90002defa08
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192
 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5487
 alloc_pages_vma+0x393/0x7c0 mm/mempolicy.c:2146
 wp_page_copy+0x235/0x1fd0 mm/memory.c:3056
 handle_pte_fault mm/memory.c:4668 [inline]
 __handle_mm_fault mm/memory.c:4785 [inline]
 handle_mm_fault+0x1eca/0x43c0 mm/memory.c:4883
 do_user_addr_fault+0x489/0xc80 arch/x86/mm/fault.c:1357
 handle_page_fault arch/x86/mm/fault.c:1445 [inline]
 exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1501
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x5642eead578b
Code: 8b 46 08 66 48 0f 6e c6 48 89 7e 08 66 48 0f 6e c8 66 0f 6c c1 0f 11 07 48 89 38 c3 0f 1f 00 48 8b 47 08 48 8b 17 66 0f ef c0 <48> 89 42 08 48 89 10 0f 11 07 c3 66 2e 0f 1f 84 00 00 00 00 00 48
RSP: 002b:00007ffe1d666968 EFLAGS: 00010202
RAX: 00005642eeaf4040 RBX: 00007ffe1d666a40 RCX: 00005643283ffee0
RDX: 00005643284b9b10 RSI: 0000000000000000 RDI: 00005643283f5420
RBP: 00005643283f5420 R08: 7c3a4c9318de65c4 R09: 00007ffe1d666920
R10: 0000000000000000 R11: 1407f6da7307cf35 R12: 0000000000000000
R13: 00005642eeaf4100 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g10709 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=3172
rcu: rcu_preempt kthread starved for 10502 jiffies! g10709 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:27848 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11bb/0x4390 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x29e/0x11b0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x98/0x350 kernel/rcu/tree.c:2145
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </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: 3559 Comm: udevd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__lock_acquire+0x196/0x7c60 kernel/locking/lockdep.c:4911
Code: c7 48 85 c0 0f 84 79 58 00 00 44 89 64 24 68 4d 8d b5 e8 0a 00 00 4c 89 f0 48 c1 e8 03 48 89 84 24 88 00 00 00 42 0f b6 04 00 <84> c0 0f 85 91 64 00 00 45 8b 26 48 c7 c0 80 3f 0c 96 48 c1 e8 03
RSP: 0000:ffffc900000078c0 EFLAGS: 00000802
RAX: 0000000000000000 RBX: ffffffff8c11c660 RCX: 1ffff92000000f3c
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8c11c660
RBP: ffffc90000007b10 R08: dffffc0000000000 R09: 0000000000000001
R10: fffffbfff1ad32b6 R11: 1ffffffff1ad32b5 R12: 0000000000000000
R13: ffff88807ded3b80 R14: ffff88807ded4668 R15: ffffffff8f945f40
FS:  00007fb7368ba880(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005643284b9b18 CR3: 000000007d753000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623
 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:312
 rcu_read_lock include/linux/rcupdate.h:739 [inline]
 advance_sched+0x6ca/0x940 net/sched/sch_taprio.c:769
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x53d/0xc40 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:post_alloc_hook+0x0/0x220 mm/page_alloc.c:2390
Code: bf 1d 8c 4c 89 f6 e8 2f c2 48 02 eb ac 4c 89 f7 48 c7 c6 c0 9b 14 8a e8 fe 3e f8 ff 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 66 90 <55> 41 57 41 56 41 55 41 54 53 89 d5 41 89 f6 48 89 fb 49 bc 00 00
RSP: 0000:ffffc90002def798 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88813fffbc01 RCX: 0000000000000001
RDX: 0000000001100cca RSI: 0000000000000000 RDI: ffffea00019deb00
RBP: ffffc90002def9b0 R08: 0000000000001000 R09: fffffbfff1ff7a1f
R10: fffffbfff1ff7a1f R11: 1ffffffff1ff7a1e R12: ffffea00019deb00
R13: 0000000000000000 R14: 0000000001100cca R15: ffffc90002defa08
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192
 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5487
 alloc_pages_vma+0x393/0x7c0 mm/mempolicy.c:2146
 wp_page_copy+0x235/0x1fd0 mm/memory.c:3056
 handle_pte_fault mm/memory.c:4668 [inline]
 __handle_mm_fault mm/memory.c:4785 [inline]
 handle_mm_fault+0x1eca/0x43c0 mm/memory.c:4883
 do_user_addr_fault+0x489/0xc80 arch/x86/mm/fault.c:1357
 handle_page_fault arch/x86/mm/fault.c:1445 [inline]
 exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1501
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x5642eead578b
Code: 8b 46 08 66 48 0f 6e c6 48 89 7e 08 66 48 0f 6e c8 66 0f 6c c1 0f 11 07 48 89 38 c3 0f 1f 00 48 8b 47 08 48 8b 17 66 0f ef c0 <48> 89 42 08 48 89 10 0f 11 07 c3 66 2e 0f 1f 84 00 00 00 00 00 48
RSP: 002b:00007ffe1d666968 EFLAGS: 00010202
RAX: 00005642eeaf4040 RBX: 00007ffe1d666a40 RCX: 00005643283ffee0
RDX: 00005643284b9b10 RSI: 0000000000000000 RDI: 00005643283f5420
RBP: 00005643283f5420 R08: 7c3a4c9318de65c4 R09: 00007ffe1d666920
R10: 0000000000000000 R11: 1407f6da7307cf35 R12: 0000000000000000
R13: 00005642eeaf4100 R14: 0000000000000000 R15: 0000000000000000
 </TASK>