watchdog: BUG: soft lockup - CPU#0 stuck for 111s! [syz.9.1392:11639] Modules linked in: irq event stamp: 11388611 hardirqs last enabled at (11388610): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (11388611): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (9626712): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (9626712): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (9626712): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (9626715): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (9626715): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (9626715): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 11639 Comm: syz.9.1392 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:do_perf_trace_lock include/trace/events/lock.h:50 [inline] RIP: 0010:perf_trace_lock+0x331/0x410 include/trace/events/lock.h:50 Code: 10 8b 94 24 80 00 00 00 4c 8b 4c 24 60 41 b8 01 00 00 00 44 89 f6 48 8b 4c 24 38 6a 00 ff 74 24 20 e8 33 fe 58 00 48 83 c4 10 <43> c6 44 27 08 f8 43 c6 44 27 04 f8 65 ff 0d 1c f4 7b 11 74 40 48 RSP: 0018:ffffc90000006700 EFLAGS: 00000286 RAX: 0000000000000000 RBX: ffffe8ffffcd7010 RCX: 0000000000000001 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000006800 R08: ffffc9000000662f R09: 0000000000000000 R10: ffffc90000006620 R11: ffffffffa0207b8c R12: dffffc0000000000 R13: dffffc0000000000 R14: 000000000000002c R15: 1ffff92000000ce8 FS: 00007f7de43f16c0(0000) GS:ffff888125453000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000000625a2000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __do_trace_lock_release include/trace/events/lock.h:69 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x392/0x3d0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:310 [inline] rcu_read_unlock include/linux/rcupdate.h:869 [inline] class_rcu_destructor include/linux/rcupdate.h:1181 [inline] unwind_next_frame+0x1aaa/0x23c0 arch/x86/kernel/unwind_orc.c:695 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4538 [inline] slab_alloc_node mm/slub.c:4866 [inline] kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4873 skb_clone+0x212/0x3a0 net/core/skbuff.c:2120 dev_queue_xmit_nit+0x29a/0xad0 net/core/dev.c:2574 xmit_one net/core/dev.c:3884 [inline] dev_hard_start_xmit+0x1cf/0x870 net/core/dev.c:3904 sch_direct_xmit+0x251/0x4c0 net/sched/sch_generic.c:347 __dev_xmit_skb net/core/dev.c:4203 [inline] __dev_queue_xmit+0x1550/0x3890 net/core/dev.c:4819 NF_HOOK+0x33a/0x3c0 include/linux/netfilter.h:-1 arp_xmit+0x16c/0x270 net/ipv4/arp.c:666 arp_process+0x1475/0x18a0 net/ipv4/arp.c:856 NF_HOOK+0x33a/0x3c0 include/linux/netfilter.h:-1 __netif_receive_skb_list_ptype net/core/dev.c:6229 [inline] __netif_receive_skb_list_core+0x765/0x810 net/core/dev.c:6271 __netif_receive_skb_list net/core/dev.c:6323 [inline] netif_receive_skb_list_internal+0x995/0xcf0 net/core/dev.c:6414 gro_normal_list include/net/gro.h:523 [inline] gro_normal_one include/net/gro.h:543 [inline] gro_skb_finish net/core/gro.c:603 [inline] gro_receive_skb+0x632/0xd40 net/core/gro.c:633 receive_buf+0xb09/0x1900 drivers/net/virtio_net.c:2656 virtnet_receive_packets drivers/net/virtio_net.c:2968 [inline] virtnet_receive drivers/net/virtio_net.c:2992 [inline] virtnet_poll+0x219e/0x2f90 drivers/net/virtio_net.c:3081 __napi_poll+0xae/0x340 net/core/dev.c:7709 napi_poll net/core/dev.c:7772 [inline] net_rx_action+0x627/0xf70 net/core/dev.c:7929 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 dd 41 ef f5 f7 c3 00 02 00 00 74 05 e8 70 ad 1a f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 a4 fe e0 f5 65 8b 05 0d e0 69 07 85 c0 74 18 5b 41 5e c3 cc cc RSP: 0018:ffffc9000545f480 EFLAGS: 00000206 RAX: 0000000000000006 RBX: 0000000000000246 RCX: 0000000080000001 RDX: 0000000000000000 RSI: ffffffff8defb6b1 RDI: 0000000000000001 RBP: 1ffffffff1cec800 R08: ffffffff9011d9b7 R09: 1ffffffff2023b36 R10: dffffc0000000000 R11: fffffbfff2023b37 R12: ffffffff8e764260 R13: ffffffff8e764180 R14: ffffffff8e7646d8 R15: 0000000000000000 rcu_report_unblock_qs_rnp kernel/rcu/tree.c:2426 [inline] rcu_preempt_deferred_qs_irqrestore+0x906/0xbc0 kernel/rcu/tree_plugin.h:571 __rcu_read_unlock+0x83/0xe0 kernel/rcu/tree_plugin.h:438 __reset_page_owner+0x85/0x1f0 mm/page_owner.c:321 reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1433 [inline] __free_frozen_pages+0xc2b/0xdb0 mm/page_alloc.c:2978 ___free_pages_bulk mm/kasan/shadow.c:333 [inline] __kasan_populate_vmalloc_do mm/kasan/shadow.c:385 [inline] __kasan_populate_vmalloc+0x137/0x1d0 mm/kasan/shadow.c:424 kasan_populate_vmalloc include/linux/kasan.h:580 [inline] alloc_vmap_area+0xd73/0x14b0 mm/vmalloc.c:2129 __get_vm_area_node+0x1f8/0x300 mm/vmalloc.c:3232 __vmalloc_node_range_noprof+0x372/0x1730 mm/vmalloc.c:4024 __vmalloc_node_noprof mm/vmalloc.c:4124 [inline] __vmalloc_noprof+0xd2/0x120 mm/vmalloc.c:4140 bpf_prog_alloc_no_stats+0x4a/0x4f0 kernel/bpf/core.c:106 bpf_prog_alloc+0x3c/0x1a0 kernel/bpf/core.c:155 bpf_prog_load+0x7ba/0x1ae0 kernel/bpf/syscall.c:2986 __sys_bpf+0x618/0x950 kernel/bpf/syscall.c:6252 __do_sys_bpf kernel/bpf/syscall.c:6365 [inline] __se_sys_bpf kernel/bpf/syscall.c:6363 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6363 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: 0033:0x7f7de359c819 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:00007f7de43f1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f7de3816090 RCX: 00007f7de359c819 RDX: 0000000000000094 RSI: 00002000000003c0 RDI: 0000000000000005 RBP: 00007f7de3632c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7de3816128 R14: 00007f7de3816090 R15: 00007ffc11170588 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6989 Comm: kworker/u8:11 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xce5/0x12c0 kernel/smp.c:877 Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 d4 eb 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 7f e7 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 63 e7 RSP: 0018:ffffc90003a37700 EFLAGS: 00000293 RAX: ffffffff81b9cd6d RBX: 1ffff110170c8525 RCX: ffff88802a8e9e80 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90003a37840 R08: ffffffff9011d9b7 R09: 1ffffffff2023b36 R10: dffffc0000000000 R11: fffffbfff2023b37 R12: ffff8880b8642928 R13: dffffc0000000000 R14: ffff8880b873c000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125553000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0fa215b368 CR3: 000000000e54c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: 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:2761 [inline] smp_text_poke_batch_finish+0x5f5/0x1160 arch/x86/kernel/alternative.c:2971 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:3276 [inline] process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245