rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10464 ticks this GP) idle=8484/1/0x4000000000000000 softirq=36682/36970 fqs=4600 rcu: hardirqs softirqs csw/system rcu: number: 1640213 533 0 rcu: cputime: 21113 31354 64 ==> 52470(ms) rcu: (t=10500 jiffies g=45189 q=954 ncpus=2) CPU: 0 PID: 11249 Comm: syz.4.1437 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:ffffc900000079e0 EFLAGS: 00000206 RAX: c5dc255a1bebeb00 RBX: 0000000000000a06 RCX: c5dc255a1bebeb00 RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: 0000000000000001 RBP: ffffc90000007a68 R08: ffffffff90d945e7 R09: 1ffffffff21b28bc R10: dffffc0000000000 R11: fffffbfff21b28bd R12: dffffc0000000000 R13: ffff888068f1c230 R14: ffffffff97153ee0 R15: 1ffff92000000f3c FS: 00007fda47eb36c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c330d7e CR3: 000000007cdb2000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 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] __mod_timer+0x55/0xdb0 kernel/time/timer.c:1020 mrp_join_timer_arm net/802/mrp.c:596 [inline] mrp_join_timer+0x13f/0x170 net/802/mrp.c:611 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:call_rcu+0x6c3/0x930 kernel/rcu/tree.c:2837 Code: 84 24 a1 00 00 00 02 75 5e f7 44 24 58 00 02 00 00 49 bc 00 00 00 00 00 fc ff df 74 01 fb 48 c7 84 24 80 00 00 00 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 66 43 c7 44 25 09 00 00 43 c6 44 25 0b RSP: 0018:ffffc9000373f0a0 EFLAGS: 00000206 RAX: c5dc255a1bebeb00 RBX: ffffc90003600000 RCX: c5dc255a1bebeb00 RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: ffffffff8afc6f80 RBP: ffffc9000373f1d0 R08: ffffffff8e4a212f R09: 1ffffffff1c94425 R10: dffffc0000000000 R11: fffffbfff1c94426 R12: dffffc0000000000 R13: 1ffff920006e7e24 R14: 1ffff110171c79fd R15: 0000000000000034 thread_stack_delayed_free kernel/fork.c:231 [inline] free_thread_stack kernel/fork.c:337 [inline] release_task_stack kernel/fork.c:590 [inline] put_task_stack+0x147/0x200 kernel/fork.c:597 finish_task_switch+0x442/0x920 kernel/sched/core.c:5287 context_switch kernel/sched/core.c:5383 [inline] __schedule+0x14da/0x44d0 kernel/sched/core.c:6699 preempt_schedule_irq+0xb5/0x140 kernel/sched/core.c:7009 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:lock_release+0x57c/0x8b0 kernel/locking/lockdep.c:5778 Code: 00 00 00 00 9c 8f 84 24 80 00 00 00 f6 84 24 81 00 00 00 02 75 75 f7 44 24 50 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 2f 00 00 00 00 66 43 c7 44 2f 09 00 00 43 c6 44 2f 0b 00 RSP: 0018:ffffc9000373f5e0 EFLAGS: 00000206 RAX: 0000000000000001 RBX: ffffffffffffffff RCX: c5dc255a1bebeb00 RDX: 0000000000000000 RSI: ffffffff8aaace60 RDI: ffffffff8afc6f80 RBP: ffffc9000373f700 R08: ffffffff8e4a212f R09: 1ffffffff1c94425 R10: dffffc0000000000 R11: fffffbfff1c94426 R12: ffff8880219146e0 R13: dffffc0000000000 R14: ffff8880219146d0 R15: 1ffff920006e7ec8 page_table_check_free include/linux/page_table_check.h:41 [inline] free_pages_prepare mm/page_alloc.c:1155 [inline] free_unref_page_prepare+0x7e1/0x8e0 mm/page_alloc.c:2336 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429 page_pool_empty_alloc_cache_once net/core/page_pool.c:836 [inline] page_pool_scrub net/core/page_pool.c:842 [inline] page_pool_release+0x113/0xaa0 net/core/page_pool.c:855 page_pool_destroy+0x284/0x490 net/core/page_pool.c:926 xdp_test_run_teardown net/bpf/test_run.c:216 [inline] bpf_test_run_xdp_live+0x196e/0x1a20 net/bpf/test_run.c:389 bpf_prog_test_run_xdp+0x76c/0xfa0 net/bpf/test_run.c:1259 bpf_prog_test_run+0x321/0x390 kernel/bpf/syscall.c:4129 __sys_bpf+0x440/0x800 kernel/bpf/syscall.c:5491 __do_sys_bpf kernel/bpf/syscall.c:5577 [inline] __se_sys_bpf kernel/bpf/syscall.c:5575 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5575 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: 0033:0x7fda46f8f749 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:00007fda47eb3038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fda471e6090 RCX: 00007fda46f8f749 RDX: 0000000000000048 RSI: 0000200000000600 RDI: 000000000000000a RBP: 00007fda47013f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fda471e6128 R14: 00007fda471e6090 R15: 00007ffdee7d3a98