rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10498 ticks this GP) idle=de6c/1/0x4000000000000000 softirq=11972/11972 fqs=5249 rcu: hardirqs softirqs csw/system rcu: number: 1420275 0 0 rcu: cputime: 14956 37523 73 ==> 52500(ms) rcu: (t=10502 jiffies g=10657 q=829 ncpus=2) CPU: 1 PID: 5925 Comm: syz.0.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xa9/0x110 kernel/locking/spinlock.c:194 Code: 74 05 e8 0a d9 1a f7 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 e2 53 ea f6 65 8b 05 d3 9a 92 75 85 c0 74 3c 48 c7 04 24 0e 36 RSP: 0018:ffffc900001f09e0 EFLAGS: 00000206 RAX: e9ca711d471bf700 RBX: 0000000000000a06 RCX: e9ca711d471bf700 RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: 0000000000000001 RBP: ffffc900001f0a68 R08: ffffffff90d945c7 R09: 1ffffffff21b28b8 R10: dffffc0000000000 R11: fffffbfff21b28b9 R12: dffffc0000000000 R13: ffff88801bb2b8f8 R14: ffffffff9705e390 R15: 1ffff9200003e13c FS: 000055555645f500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000076cb1000 CR4: 00000000003506e0 Call Trace: debug_object_assert_init+0x1f1/0x2f0 lib/debugobjects.c:900 debug_timer_assert_init kernel/time/timer.c:792 [inline] debug_assert_init kernel/time/timer.c:837 [inline] __timer_delete+0x3f/0x290 kernel/time/timer.c:1321 del_timer include/linux/timer.h:213 [inline] lapb_start_t1timer net/lapb/lapb_timer.c:38 [inline] lapb_t1timer_expiry+0x6a6/0xab0 net/lapb/lapb_timer.c:202 call_timer_fn+0x16e/0x530 kernel/time/timer.c:1701 expire_timers kernel/time/timer.c:1752 [inline] __run_timers+0x52d/0x7d0 kernel/time/timer.c:2023 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036 handle_softirqs+0x280/0x820 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:preempt_schedule_irq+0xb0/0x140 kernel/sched/core.c:7009 Code: 44 24 20 f6 44 24 21 02 74 0b 0f 0b 48 f7 03 08 00 00 00 74 63 bf 01 00 00 00 e8 8b b3 eb f6 e8 26 3a 1c f7 fb bf 01 00 00 00 db b5 ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24 RSP: 0018:ffffc90003367280 EFLAGS: 00000282 RAX: e9ca711d471bf700 RBX: 0000000000000000 RCX: e9ca711d471bf700 RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: 0000000000000001 RBP: ffffc90003367330 R08: ffffffff8e4a212f R09: 1ffffffff1c94425 R10: dffffc0000000000 R11: fffffbfff1c94426 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200066ce50 irqentry_exit+0x67/0x70 kernel/entry/common.c:438 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:unwind_next_frame+0x38/0x2970 arch/x86/kernel/unwind_orc.c:470 Code: 48 81 ec 98 00 00 00 49 89 fc 49 bd 00 00 00 00 00 fc ff df e8 59 ed 4a 00 49 8d 5c 24 48 48 89 d8 48 c1 e8 03 48 89 44 24 40 <42> 80 3c 28 00 74 08 48 89 df e8 29 5b a2 00 48 89 5c 24 20 4d 8b RSP: 0018:ffffc900033673f8 EFLAGS: 00000a02 RAX: 1ffff9200066cea2 RBX: ffffc90003367510 RCX: ffff888077b0da00 RDX: 0000000000000000 RSI: ffffffff81d13fcc RDI: ffffc900033674c8 RBP: ffffc90003367550 R08: ffffc90003367590 R09: 0000000000000001 R10: 0000000000000004 R11: 0000000000000000 R12: ffffc900033674c8 R13: dffffc0000000000 R14: ffffffff81746d20 R15: ffffc900033674c8 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 save_stack+0xf7/0x1f0 mm/page_owner.c:128 __set_page_owner+0x1d/0x60 mm/page_owner.c:192 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554 prep_new_page mm/page_alloc.c:1561 [inline] get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191 __alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457 __stack_depot_save+0x435/0x630 lib/stackdepot.c:410 kasan_save_stack+0x4d/0x60 mm/kasan/common.c:46 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492 task_work_add+0xd3/0x440 kernel/task_work.c:77 fput+0xdd/0x1a0 fs/file_table.c:440 filp_close+0x10f/0x150 fs/open.c:1547 __range_close fs/file.c:698 [inline] __close_range+0x342/0x630 fs/file.c:755 __do_sys_close_range fs/open.c:1599 [inline] __se_sys_close_range fs/open.c:1596 [inline] __x64_sys_close_range+0x7a/0x90 fs/open.c:1596 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f2db5f8f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc9216e618 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: ffffffffffffffda RBX: 000000000001af25 RCX: 00007f2db5f8f749 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000001 R09: 000000029216e90f R10: 0000001b33520000 R11: 0000000000000246 R12: 00007f2db61e5fac R13: 00007f2db61e5fa0 R14: ffffffffffffffff R15: 0000000000000005