watchdog: BUG: soft lockup - CPU#1 stuck for 134s! [syz.5.1992:16313] Modules linked in: irq event stamp: 22761059 hardirqs last enabled at (22761058): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (22761059): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (21971884): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (21971884): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (21971884): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (21971887): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (21971887): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (21971887): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 16313 Comm: syz.5.1992 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216 Code: 8b 3d 04 34 55 0c 48 89 de 5b e9 03 97 5e 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0d 28 44 56 11 65 8b 15 49 44 56 11 81 e2 00 01 ff 00 74 RSP: 0018:ffffc90000a082f0 EFLAGS: 00000246 RAX: ffffffff8a55b636 RBX: ffff88801af770c8 RCX: 0000000000000100 RDX: ffff888090cfbc80 RSI: 00000000fffffffd RDI: 00000000fffffffd RBP: 1ffff110035eee19 R08: ffffc90000a08600 R09: ffffc90000a08610 R10: ffffc90000a08460 R11: fffff5200014108e R12: 0000000000000003 R13: ffff88801af770c8 R14: 1ffff110035eee1b R15: 00000000fffffffd FS: 00007fd76f9f26c0(0000) GS:ffff888125563000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000005dee6000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: find_match+0x146/0xb40 net/ipv6/route.c:789 __find_rr_leaf+0x248/0x760 net/ipv6/route.c:868 find_rr_leaf net/ipv6/route.c:889 [inline] rt6_select net/ipv6/route.c:933 [inline] fib6_table_lookup+0x3b4/0xa80 net/ipv6/route.c:2246 ip6_pol_route+0x228/0x13d0 net/ipv6/route.c:2282 pol_lookup_func include/net/ip6_fib.h:617 [inline] fib6_rule_lookup+0x556/0x730 net/ipv6/fib6_rules.c:120 ip6_route_input_lookup net/ipv6/route.c:2351 [inline] ip6_route_input+0x730/0xad0 net/ipv6/route.c:2654 ip6_rcv_finish+0x141/0x2e0 net/ipv6/ip6_input.c:77 NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318 __netif_receive_skb_one_core net/core/dev.c:6167 [inline] __netif_receive_skb net/core/dev.c:6280 [inline] process_backlog+0x7dd/0x1950 net/core/dev.c:6631 __napi_poll+0xae/0x340 net/core/dev.c:7695 napi_poll net/core/dev.c:7758 [inline] net_rx_action+0x627/0xf70 net/core/dev.c:7910 handle_softirqs+0x22a/0x870 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:194 Code: f7 e8 7d 00 f2 f5 f7 c3 00 02 00 00 74 05 e8 c0 4f 1d f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 c4 c6 e3 f5 65 8b 05 8d af 6b 07 85 c0 74 18 5b 41 5e c3 cc cc RSP: 0018:ffffc90002f47500 EFLAGS: 00000206 RAX: 0000000000000002 RBX: 0000000000000292 RCX: 0000000000000002 RDX: 0000000000000007 RSI: ffffffff8def2f52 RDI: 0000000000000001 RBP: 0000000000000000 R08: ffffffff90118eb7 R09: 1ffffffff20231d6 R10: dffffc0000000000 R11: fffffbfff20231d7 R12: ffff8880790eae10 R13: ffff8880790eae00 R14: ffffffff9a568f20 R15: 1ffff1100f21d5c2 debug_object_activate+0x320/0x580 lib/debugobjects.c:836 debug_rcu_head_queue kernel/rcu/rcu.h:236 [inline] __call_rcu_common kernel/rcu/tree.c:3116 [inline] call_rcu+0x43/0x890 kernel/rcu/tree.c:3251 context_switch kernel/sched/core.c:5298 [inline] __schedule+0x158d/0x5340 kernel/sched/core.c:6907 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7234 irqentry_exit+0x599/0x620 kernel/entry/common.c:239 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:debug_check_no_locks_freed+0x0/0x170 kernel/locking/lockdep.c:6711 Code: 0f 84 1a ff ff ff 90 0f 0b 90 e9 11 ff ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 55 41 57 41 56 41 55 41 54 53 65 48 8b 1d b2 0d 7a 11 RSP: 0018:ffffc90002f47930 EFLAGS: 00000206 RAX: 0000000000000003 RBX: 0000000000008000 RCX: 0000000000000003 RDX: 0000000000000004 RSI: 0000000000008000 RDI: ffff88804d170000 RBP: 0000000000000008 R08: ffffc90002f47517 R09: 0000000000000000 R10: ffffc90002f47508 R11: fffff520005e8ea3 R12: ffffea0001345c00 R13: 0000000000000003 R14: ffff88804d170000 R15: 0000000000000000 __free_pages_prepare mm/page_alloc.c:1438 [inline] __free_frozen_pages+0x4d0/0xdb0 mm/page_alloc.c:2978 __slab_free+0x263/0x2b0 mm/slub.c:5551 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4515 [inline] slab_alloc_node mm/slub.c:4844 [inline] kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4851 lsm_file_alloc security/security.c:169 [inline] security_file_alloc+0x34/0x310 security/security.c:2380 init_file+0x90/0x2b0 fs/file_table.c:159 alloc_empty_file+0x6e/0x1d0 fs/file_table.c:241 alloc_file fs/file_table.c:355 [inline] alloc_file_pseudo+0x155/0x240 fs/file_table.c:384 __anon_inode_getfile fs/anon_inodes.c:166 [inline] anon_inode_getfile+0xc5/0x1a0 fs/anon_inodes.c:204 __do_sys_perf_event_open kernel/events/core.c:14065 [inline] __se_sys_perf_event_open+0xf05/0x1d60 kernel/events/core.c:13767 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd76eb9c799 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd76f9f2028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007fd76ee15fa0 RCX: 00007fd76eb9c799 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000040 RBP: 00007fd76ec32bd9 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd76ee16038 R14: 00007fd76ee15fa0 R15: 00007fff9ab40678 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 1017 Comm: kworker/u8:8 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216 Code: 8b 3d 04 34 55 0c 48 89 de 5b e9 03 97 5e 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0d 28 44 56 11 65 8b 15 49 44 56 11 81 e2 00 01 ff 00 74 RSP: 0018:ffffc900046bf718 EFLAGS: 00000202 RAX: ffffffff81b9adcd RBX: 1ffff110170e812d RCX: ffff888027205ac0 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900046bf860 R08: ffffffff90118eb7 R09: 1ffffffff20231d6 R10: dffffc0000000000 R11: fffffbfff20231d7 R12: ffff8880b8740968 R13: dffffc0000000000 R14: ffff8880b863bf80 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888125463000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1c1554deb8 CR3: 000000000e54c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: csd_lock_wait kernel/smp.c:342 [inline] smp_call_function_many_cond+0xcfd/0x12c0 kernel/smp.c:877 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043 on_each_cpu include/linux/smp.h:72 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2746 [inline] smp_text_poke_batch_finish+0x5f5/0x1160 arch/x86/kernel/alternative.c:2956 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x128/0x240 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate+0xab/0x290 mm/kfence/core.c:900 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358 worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245