rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=9504/1/0x4000000000000000 softirq=109829/109829 fqs=0
rcu: 	(detected by 0, t=10502 jiffies, g=101133, q=147 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 20681 Comm: syz.0.4165 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:hlock_class kernel/locking/lockdep.c:234 [inline]
RIP: 0010:mark_lock+0x3c/0x190 kernel/locking/lockdep.c:4731
Code: 00 03 00 83 f9 01 bb 09 00 00 00 83 db 00 83 fa 08 0f 45 da bd 01 00 00 00 89 d9 d3 e5 25 ff 1f 00 00 48 0f a3 05 f4 aa 2d 12 <73> 10 48 69 c0 c8 00 00 00 48 8d 88 30 53 6c 93 eb 48 83 3d 5b 3a
RSP: 0018:ffffc90000a08af8 EFLAGS: 00000003
RAX: 000000000000095b RBX: 0000000000000008 RCX: 0000000000000008
RDX: 0000000000000008 RSI: ffff88802f54e5f0 RDI: ffff88802f54dac0
RBP: 0000000000000100 R08: 0000000000000000 R09: ffffffff89a337c4
R10: dffffc0000000000 R11: ffffffff89a33700 R12: ffffffffffffff03
R13: 0000000000000003 R14: ffff88802f54e5f0 R15: 0000000000000000
FS:  00007fc088da16c0(0000) GS:ffff888125ae7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c33421b CR3: 0000000028e4c000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 mark_usage kernel/locking/lockdep.c:4674 [inline]
 __lock_acquire+0x6a8/0xd20 kernel/locking/lockdep.c:5191
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 advance_sched+0xc4/0xc90 net/sched/sch_taprio.c:929
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x52c/0xc60 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1058
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:should_failslab+0x93/0x100 mm/failslab.c:46
Code: 48 c1 e9 03 42 0f b6 0c 21 84 c9 75 62 41 f6 47 01 40 74 37 c1 eb 0d 83 e3 01 49 83 c6 34 4c 89 f0 48 c1 e8 03 42 0f b6 04 20 <84> c0 75 2a 41 8b 36 48 c7 c7 e0 e5 45 8e 89 da e8 08 36 dd 02 31
RSP: 0018:ffffc900049efcc0 EFLAGS: 00000a03
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1fc7932ce20fa700
RDX: ffff88802f54dac0 RSI: 0000000000000cc0 RDI: ffff88801bebe640
RBP: 0000000000000cc0 R08: 0000000000000000 R09: ffffffff821686cd
R10: ffffc900049efde0 R11: fffff5200093dfbe R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88801bebe674 R15: 00007fc088da0c10
 slab_pre_alloc_hook mm/slub.c:4898 [inline]
 slab_alloc_node mm/slub.c:5220 [inline]
 kmem_cache_alloc_noprof+0x74/0x6e0 mm/slub.c:5251
 getname_flags+0xb8/0x540 fs/namei.c:146
 getname include/linux/fs.h:2924 [inline]
 do_sys_openat2+0xbc/0x1c0 fs/open.c:1429
 do_sys_open fs/open.c:1450 [inline]
 __do_sys_openat fs/open.c:1466 [inline]
 __se_sys_openat fs/open.c:1461 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1461
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc087f8d590
Code: 48 89 44 24 20 75 93 44 89 54 24 0c e8 49 94 02 00 44 8b 54 24 0c 89 da 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 38 44 89 c7 89 44 24 0c e8 9c 94 02 00 8b 44
RSP: 002b:00007fc088da0b70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc087f8d590
RDX: 0000000000000000 RSI: 00007fc088da0c10 RDI: 00000000ffffff9c
RBP: 00007fc088da0c10 R08: 0000000000000000 R09: 0072736d2f232f75
R10: 0000000000000000 R11: 0000000000000293 R12: cccccccccccccccd
R13: 00007fc0881d6038 R14: 00007fc0881d5fa0 R15: 00007fffe65769f8
 </TASK>
rcu: rcu_preempt kthread starved for 10502 jiffies! g101133 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:26464 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5360 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6964
 __schedule_loop kernel/sched/core.c:7046 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7061
 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+0x4bc/0x870 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: 0 UID: 0 PID: 20680 Comm: syz.0.4165 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xd33/0x12d0 kernel/smp.c:877
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 36 79 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 e1 74 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 c5 74
RSP: 0000:ffffc90004a3f700 EFLAGS: 00000293
RAX: ffffffff81b4645b RBX: 1ffff110170e7ffd RCX: ffff888025aa1e40
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90004a3f880 R08: ffffffff8fc39677 R09: 1ffffffff1f872ce
R10: dffffc0000000000 R11: fffffbfff1f872cf R12: ffff8880b873ffe8
R13: dffffc0000000000 R14: ffff8880b863b200 R15: 0000000000000001
FS:  000055555b86b500(0000) GS:ffff8881259e7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffe65748d0 CR3: 0000000028e4c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
 flush_tlb_mm_range+0x6b1/0x12d0 arch/x86/mm/tlb.c:1451
 flush_tlb_page arch/x86/include/asm/tlbflush.h:324 [inline]
 ptep_clear_flush+0x120/0x170 mm/pgtable-generic.c:101
 wp_page_copy mm/memory.c:3789 [inline]
 do_wp_page+0x1bc2/0x5800 mm/memory.c:4184
 handle_pte_fault mm/memory.c:6242 [inline]
 __handle_mm_fault+0x1033/0x5400 mm/memory.c:6367
 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6536
 do_user_addr_fault+0xa7c/0x1380 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7fc087f3c23b
Code: c0 8b 87 c0 00 00 00 66 0f 6c c0 85 c0 0f 85 44 01 00 00 c7 87 c0 00 00 00 ff ff ff ff 48 8d 84 24 20 21 00 00 48 8d 7c 24 20 <0f> 29 44 24 40 49 89 e4 48 89 44 24 50 8b 43 74 48 89 9c 24 00 01
RSP: 002b:00007fffe6574890 EFLAGS: 00010246
RAX: 00007fffe65769b0 RBX: 00007fc0881a7640 RCX: 0000000000000000
RDX: 00007fffe65769f8 RSI: 00007fc088012ade RDI: 00007fffe65748b0
RBP: 000000000000006e R08: 00007fc0881d5fa0 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000001 R12: 00007fc0881d5fa0
R13: 00007fc0881d6720 R14: 0000000000000091 R15: 0000000000000003
 </TASK>