watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [syz.0.2277:15488] Modules linked in: irq event stamp: 11528577 hardirqs last enabled at (11528576): [] irqentry_exit+0x59c/0x620 kernel/entry/common.c:219 hardirqs last disabled at (11528577): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (5590504): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (5590504): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (5590504): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (5590507): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (5590507): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (5590507): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 15488 Comm: syz.0.2277 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:lock_acquire+0x221/0x330 kernel/locking/lockdep.c:5872 Code: ff ff ff e8 f1 f8 fa 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 db 59 54 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 c0 dc fd 09 cc 48 8d 3d 18 7f 52 RSP: 0018:ffffc90000a08280 EFLAGS: 00000282 RAX: a97bea866f380d00 RBX: 0000000000000000 RCX: 0000000000000102 RDX: 0000000084b315d5 RSI: ffffffff8df3d941 RDI: ffffffff8c075280 RBP: ffffffff81d013d2 R08: ffffffff81d013d2 R09: ffffffff8e557fe0 R10: dffffc0000000000 R11: fffff91ffffbf605 R12: 0000000000000002 R13: ffffffff8e557fe0 R14: 0000000000000000 R15: 0000000000000246 FS: 00007fa2f47d56c0(0000) GS:ffff8881257d3000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f149e065544 CR3: 000000004ed78000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:302 [inline] rcu_read_lock include/linux/rcupdate.h:838 [inline] trace_call_bpf+0xe3/0xb70 kernel/trace/bpf_trace.c:-1 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:11009 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x326/0x3f0 include/trace/events/lock.h:50 __do_trace_lock_release include/trace/events/lock.h:69 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x379/0x3a0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:312 [inline] rcu_read_unlock include/linux/rcupdate.h:868 [inline] class_rcu_destructor include/linux/rcupdate.h:1166 [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:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_node_noprof+0x427/0x6f0 mm/slub.c:5315 kmalloc_reserve+0xbd/0x290 net/core/skbuff.c:586 __alloc_skb+0x204/0x390 net/core/skbuff.c:690 alloc_skb include/linux/skbuff.h:1383 [inline] ndisc_alloc_skb+0x9f/0x480 net/ipv6/ndisc.c:420 ndisc_send_rs+0x2b5/0x630 net/ipv6/ndisc.c:706 addrconf_rs_timer+0x395/0x6d0 net/ipv6/addrconf.c:4037 call_timer_fn+0x192/0x5a0 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404 handle_softirqs+0x22a/0x7c0 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:__bpf_prog_run include/linux/filter.h:715 [inline] RIP: 0010:bpf_prog_run include/linux/filter.h:730 [inline] RIP: 0010:bpf_prog_run_array include/linux/bpf.h:2471 [inline] RIP: 0010:trace_call_bpf+0x4a2/0xb70 kernel/trace/bpf_trace.c:145 Code: 24 40 2e e8 e4 2b 30 1e 41 89 c5 e8 68 1c 9a ff 48 89 44 24 50 49 83 c7 38 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ff e8 e0 95 5d 00 49 8b 07 48 89 44 24 48 RSP: 0018:ffffc90004f16940 EFLAGS: 00000a02 RAX: 1ffff920009dfa07 RBX: ffff888025414d98 RCX: dffffc0000000000 RDX: ffffc900209cc000 RSI: 000000000003dc19 RDI: 000000000003dc1a RBP: ffffc90004f16a58 R08: ffffc90004f169ef R09: 0000000000000000 R10: ffffc90004f169e0 R11: ffffffffa0201a20 R12: ffff888025414da8 R13: 0000000000000000 R14: 0000000000000001 R15: ffffc90004efd038 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:11009 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x326/0x3f0 include/trace/events/lock.h:50 __do_trace_lock_release include/trace/events/lock.h:69 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x379/0x3a0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:312 [inline] rcu_read_unlock include/linux/rcupdate.h:868 [inline] class_rcu_destructor include/linux/rcupdate.h:1166 [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 save_stack+0x122/0x230 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:1433 [inline] __free_frozen_pages+0xbf8/0xd70 mm/page_alloc.c:2973 discard_slab mm/slub.c:3346 [inline] __put_partials+0x146/0x170 mm/slub.c:3886 __slab_free+0x294/0x320 mm/slub.c:5956 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:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] __do_kmalloc_node mm/slub.c:5656 [inline] __kmalloc_node_noprof+0x516/0x7f0 mm/slub.c:5663 kmalloc_node_noprof include/linux/slab.h:1093 [inline] __vmalloc_area_node mm/vmalloc.c:3842 [inline] __vmalloc_node_range_noprof+0x5d5/0x1730 mm/vmalloc.c:4051 __vmalloc_node_noprof mm/vmalloc.c:4111 [inline] vmalloc_noprof+0xb2/0xe0 mm/vmalloc.c:4146 bpf_prog_calc_tag+0x4c/0x370 kernel/bpf/core.c:307 resolve_pseudo_ldimm64+0xbd/0xc90 kernel/bpf/verifier.c:21697 bpf_check+0x1cfc/0x1cd70 kernel/bpf/verifier.c:25951 bpf_prog_load+0x1484/0x1ae0 kernel/bpf/syscall.c:3088 __sys_bpf+0x618/0x950 kernel/bpf/syscall.c:6228 __do_sys_bpf kernel/bpf/syscall.c:6341 [inline] __se_sys_bpf kernel/bpf/syscall.c:6339 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6339 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa2f659bf79 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:00007fa2f47d5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fa2f6816090 RCX: 00007fa2f659bf79 RDX: 0000000000000048 RSI: 0000200000000200 RDI: 0000000000000005 RBP: 00007fa2f66327e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa2f6816128 R14: 00007fa2f6816090 R15: 00007fff7d96ebe8 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 7197 Comm: kworker/u8:26 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xce5/0x1270 kernel/smp.c:877 Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 14 fa 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 bf f5 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 a3 f5 RSP: 0018:ffffc9000beaf720 EFLAGS: 00000293 RAX: ffffffff81b87a6d RBX: 1ffff110170e8131 RCX: ffff88802d318000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000beaf860 R08: ffffffff8fefab77 R09: 1ffffffff1fdf56e R10: dffffc0000000000 R11: fffffbfff1fdf56f R12: ffff8880b8740988 R13: dffffc0000000000 R14: ffff8880b863bb40 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8881256d3000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055d8880b8080 CR3: 000000000e344000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 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:71 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2711 [inline] smp_text_poke_batch_finish+0x5f5/0x1160 arch/x86/kernel/alternative.c:2921 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:894 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340 worker_thread+0xda6/0x1360 kernel/workqueue.c:3421 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246