watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [syz.1.343:5459] Modules linked in: irq event stamp: 10958305 hardirqs last enabled at (10958304): [] asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 hardirqs last disabled at (10958305): [] sysvec_apic_timer_interrupt+0xa/0xc0 arch/x86/kernel/apic/apic.c:1118 softirqs last enabled at (8304): [] __do_softirq kernel/softirq.c:630 [inline] softirqs last enabled at (8304): [] invoke_softirq kernel/softirq.c:470 [inline] softirqs last enabled at (8304): [] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679 softirqs last disabled at (8307): [] __do_softirq kernel/softirq.c:630 [inline] softirqs last disabled at (8307): [] invoke_softirq kernel/softirq.c:470 [inline] softirqs last disabled at (8307): [] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679 CPU: 1 PID: 5459 Comm: syz.1.343 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:169 [inline] RIP: 0010:unwind_next_frame+0x1d3/0x20b0 arch/x86/kernel/unwind_orc.c:448 Code: f4 17 00 00 44 89 f0 4c 8d 24 85 dc 7c 3e 8f 4c 89 e0 48 c1 e8 03 42 0f b6 04 28 84 c0 4d 89 ef 0f 85 57 19 00 00 45 8b 24 24 <44> 89 f0 ff c0 4c 8d 2c 85 dc 7c 3e 8f 4c 89 e8 48 c1 e8 03 42 0f RSP: 0018:ffffc900001e02f0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffc900001e03c8 RCX: ffffffff96c00100 RDX: dffffc0000000000 RSI: 0000000000096079 RDI: 0000000000000001 RBP: ffffffff8a4000cb R08: ffffc900001e0490 R09: 0000000000000021 R10: dffffc0000000000 R11: fffff5200003c085 R12: 00000000001ad4d8 R13: dffffc0000000000 R14: 0000000000094000 R15: dffffc0000000000 FS: 00007fb76593d6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000000f000 CR3: 000000001ee57000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x2d/0x50 mm/kasan/generic.c:516 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:237 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1729 [inline] slab_free_freelist_hook+0x131/0x1a0 mm/slub.c:1755 slab_free mm/slub.c:3687 [inline] __kmem_cache_free+0xb6/0x1f0 mm/slub.c:3700 skb_free_head net/core/skbuff.c:762 [inline] skb_release_data+0x5db/0x7c0 net/core/skbuff.c:791 skb_release_all net/core/skbuff.c:856 [inline] __kfree_skb net/core/skbuff.c:870 [inline] kfree_skb_reason+0x163/0x370 net/core/skbuff.c:893 llc_rcv+0x755/0xc60 net/llc/llc_input.c:-1 __netif_receive_skb_list_ptype net/core/dev.c:5667 [inline] __netif_receive_skb_list_core+0x6e6/0x750 net/core/dev.c:5710 __netif_receive_skb_list net/core/dev.c:5762 [inline] netif_receive_skb_list_internal+0x93f/0xca0 net/core/dev.c:5853 netif_receive_skb_list+0x51/0x4e0 net/core/dev.c:5905 ieee80211_rx_napi+0x357/0x3d0 net/mac80211/rx.c:5342 ieee80211_rx include/net/mac80211.h:4849 [inline] ieee80211_handle_queued_frames+0x105/0x1b0 net/mac80211/main.c:317 tasklet_action_common+0x2fe/0x4d0 kernel/softirq.c:827 handle_softirqs+0x2a1/0x930 kernel/softirq.c:596 __do_softirq kernel/softirq.c:630 [inline] invoke_softirq kernel/softirq.c:470 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:preempt_schedule_irq+0xb6/0x160 kernel/sched/core.c:6874 Code: 00 00 43 c6 44 37 04 f8 74 0b 0f 0b 48 f7 03 08 00 00 00 74 7f bf 01 00 00 00 e8 15 54 22 f7 e8 10 48 52 f7 fb bf 01 00 00 00 75 b9 ff ff 43 c6 44 37 08 00 48 c7 44 24 40 00 00 00 00 9c 8f RSP: 0018:ffffc900049ef9e0 EFLAGS: 00000282 RAX: 3f66120cccc75f00 RBX: 0000000000000000 RCX: 3f66120cccc75f00 RDX: dffffc0000000000 RSI: ffffffff8a8c1120 RDI: 0000000000000001 RBP: ffffc900049efa80 R08: ffffffff8fa0e048 R09: ffffffff8fa0e058 R10: ffffffff8fa0e050 R11: ffffffff8fa0e043 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200093df3c irqentry_exit+0x63/0x70 kernel/entry/common.c:439 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:put_cpu_partial+0x1b0/0x250 mm/slub.c:2666 Code: 3b 44 24 18 0f 85 b4 00 00 00 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 ec ed 5a 08 f7 c5 00 02 00 00 74 c0 fb 4d 85 e4 <75> bf eb c8 e8 97 22 3b 02 85 c0 0f 84 e9 fe ff ff 83 3d e0 20 4d RSP: 0018:ffffc900049efb40 EFLAGS: 00000246 RAX: 3f66120cccc75f00 RBX: ffff888140009640 RCX: 3f66120cccc75f00 RDX: dffffc0000000000 RSI: ffffffff8a8c1120 RDI: ffffffff8adf13a0 RBP: 0000000000000282 R08: ffffffff8e1ff42f R09: 1ffffffff1c3fe85 R10: dffffc0000000000 R11: fffffbfff1c3fe86 R12: 0000000000000000 R13: 0000000000000001 R14: ffff88802f261dc0 R15: ffff8880b8f41ed0 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:306 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x4b/0x480 mm/slab.h:737 slab_alloc_node mm/slub.c:3359 [inline] __kmem_cache_alloc_node+0x140/0x260 mm/slub.c:3398 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1026 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] btf_parse kernel/bpf/btf.c:4992 [inline] btf_new_fd+0x109/0x780 kernel/bpf/btf.c:6914 __sys_bpf+0x612/0x780 kernel/bpf/syscall.c:5076 __do_sys_bpf kernel/bpf/syscall.c:5135 [inline] __se_sys_bpf kernel/bpf/syscall.c:5133 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5133 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fb76499cdd9 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:00007fb76593d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fb764c15fa0 RCX: 00007fb76499cdd9 RDX: 0000000000000020 RSI: 00002000000001c0 RDI: 0000000000000012 RBP: 00007fb764a32d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb764c16038 R14: 00007fb764c15fa0 R15: 00007fff0ed6ba18 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 5470 Comm: kworker/u4:10 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:rep_nop arch/x86/include/asm/vdso/processor.h:13 [inline] RIP: 0010:cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline] RIP: 0010:csd_lock_wait kernel/smp.c:424 [inline] RIP: 0010:smp_call_function_many_cond+0xea0/0x1290 kernel/smp.c:998 Code: 85 80 00 00 00 41 8b 1f 89 de 83 e6 01 31 ff e8 e6 f6 0a 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 07 e8 72 f3 0a 00 eb 37 90 41 0f b6 04 1c 84 c0 75 10 41 f7 07 01 00 00 00 74 1e e8 57 RSP: 0018:ffffc900051cf800 EFLAGS: 00000293 RAX: ffffffff817781f9 RBX: dffffc0000000000 RCX: ffff888030030000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900051cf960 R08: ffffffff90af9247 R09: 1ffffffff215f248 R10: dffffc0000000000 R11: fffffbfff215f249 R12: 1ffff110171e81d9 R13: ffff8880b8e3bbc0 R14: 0000000000000001 R15: ffff8880b8f40ec8 FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000557832bb6028 CR3: 000000000c88e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1165 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:1574 [inline] text_poke_bp_batch+0x2b7/0x850 arch/x86/kernel/alternative.c:1774 text_poke_flush arch/x86/kernel/alternative.c:1965 [inline] text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1972 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x11f/0x240 kernel/jump_label.c:207 static_key_enable+0x16/0x20 kernel/jump_label.c:220 toggle_allocation_gate+0xba/0x470 mm/kfence/core.c:821 process_one_work+0x8a2/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1270 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295