rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=6464/1/0x4000000000000000 softirq=15544/15544 fqs=0
rcu: 	(detected by 0, t=10506 jiffies, g=12245, q=65 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6078 Comm: sed Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__lock_is_held kernel/locking/lockdep.c:5601 [inline]
RIP: 0010:lock_is_held_type+0xaa/0x190 kernel/locking/lockdep.c:5940
Code: 41 83 bd 28 0b 00 00 00 7e 48 4c 89 eb 48 81 c3 30 0b 00 00 45 31 ff 49 83 ff 31 73 24 48 89 df 4c 89 f6 e8 58 02 00 00 85 c0 <75> 2a 49 ff c7 49 63 85 28 0b 00 00 48 83 c3 28 49 39 c7 7c d8 eb
RSP: 0000:ffffc90000a08c28 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff8880259f66b0 RCX: 7a48b4a4f3242e00
RDX: ffff8880259f5b80 RSI: ffff88807c8942c0 RDI: ffff8880259f66b0
RBP: 00000000ffffffff R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200014117c R12: 0000000000000046
R13: ffff8880259f5b80 R14: ffff88807c8942c0 R15: 0000000000000000
FS:  00007fd5a0ecec80(0000) GS:ffff888125f35000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd5a1170120 CR3: 00000000785eb000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 lock_is_held include/linux/lockdep.h:249 [inline]
 advance_sched+0x1d2/0xc90 net/sched/sch_taprio.c:935
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x51c/0xc30 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x3e0 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x16c/0x340 kernel/locking/lockdep.c:5872
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 d4 38 e0 10 <48> 3b 44 24 58 0f 85 e5 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0000:ffffc9000490f378 EFLAGS: 00000206
RAX: 7a48b4a4f3242e00 RBX: 0000000000000000 RCX: 7a48b4a4f3242e00
RDX: 00000000b8ab59b2 RSI: ffffffff8d979192 RDI: ffffffff8bc082e0
RBP: ffffffff81743f85 R08: ffffffff81743f85 R09: ffffffff8df41a20
R10: dffffc0000000000 R11: ffffffff81ada120 R12: 0000000000000002
R13: ffffffff8df41a20 R14: 0000000000000000 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:867 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
 unwind_next_frame+0xc2/0x23d0 arch/x86/kernel/unwind_orc.c:495
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 save_stack+0xf5/0x1f0 mm/page_owner.c:165
 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:320
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 free_unref_folios+0xdb3/0x14f0 mm/page_alloc.c:3000
 folios_put_refs+0x584/0x670 mm/swap.c:1002
 folios_put include/linux/mm.h:1671 [inline]
 folio_batch_move_lru+0x39b/0x420 mm/swap.c:179
 __folio_batch_add_and_move+0x51c/0xc40 mm/swap.c:196
 do_anonymous_page mm/memory.c:5269 [inline]
 do_pte_missing+0x2439/0x3330 mm/memory.c:4399
 handle_pte_fault mm/memory.c:6273 [inline]
 __handle_mm_fault mm/memory.c:6411 [inline]
 handle_mm_fault+0x1b26/0x32b0 mm/memory.c:6580
 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: 0033:0x7fd5a10e29d1
Code: ff a0 98 03 00 00 0f 1f 00 53 89 fb 48 83 ec 10 e8 84 c9 ee ff 48 8b 05 25 54 08 00 bf 03 00 00 00 48 89 e6 88 1d bf 44 09 00 <88> 18 88 1d 47 d7 08 00 e8 52 a8 fa ff bf 00 00 20 00 85 c0 75 18
RSP: 002b:00007ffcbd498b00 EFLAGS: 00010202
RAX: 00007fd5a1170120 RBX: 0000000000000001 RCX: ffffffffffffff98
RDX: ffffffffffffff90 RSI: 00007ffcbd498b00 RDI: 0000000000000003
RBP: 00007ffcbd498dd0 R08: 0000000000000000 R09: 000000000000000e
R10: fffffffffffff68e R11: 0000000000000206 R12: fffffffffffffff8
R13: 000000401f6c01b0 R14: 0000000000000000 R15: 00007fd5a1279310
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g12245 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=3582
rcu: rcu_preempt kthread starved for 10506 jiffies! g12245 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27736 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x14bc/0x5000 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>
hrtimer: interrupt took 114905117827 ns