watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.1.10:5869] Modules linked in: irq event stamp: 11622423 hardirqs last enabled at (11622422): [] asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 hardirqs last disabled at (11622423): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1088 softirqs last enabled at (11193742): [] __do_softirq kernel/softirq.c:612 [inline] softirqs last enabled at (11193742): [] invoke_softirq kernel/softirq.c:452 [inline] softirqs last enabled at (11193742): [] __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661 softirqs last disabled at (11193745): [] __do_softirq kernel/softirq.c:612 [inline] softirqs last disabled at (11193745): [] invoke_softirq kernel/softirq.c:452 [inline] softirqs last disabled at (11193745): [] __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661 CPU: 0 PID: 5869 Comm: syz.1.10 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline] RIP: 0010:write_comp_data kernel/kcov.c:245 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x2e/0x80 kernel/kcov.c:320 Code: 48 8b 04 24 65 48 8b 0d 80 ce 7c 7e 65 8b 15 81 ce 7c 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 57 83 b9 1c 16 00 00 00 <74> 4e 8b 91 f8 15 00 00 83 fa 03 75 43 48 8b 91 00 16 00 00 44 8b RSP: 0018:ffffc90000007758 EFLAGS: 00000246 RAX: ffffffff89585d7c RBX: 0000000000000000 RCX: ffff88801eae5a00 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000007960 R08: ffffc900000078cf R09: 0000000000000000 R10: ffffc900000078b0 R11: fffff52000000f1a R12: ffff88802671d040 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88802671d078 FS: 00007fa22eab96c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000562fe81c6088 CR3: 0000000024220000 CR4: 00000000003506f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: ipv6_masked_addr_cmp include/net/ipv6.h:597 [inline] ip6_packet_match net/ipv6/netfilter/ip6_tables.c:61 [inline] ip6t_do_table+0x62c/0x1570 net/ipv6/netfilter/ip6_tables.c:306 nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline] nf_hook_slow+0xbd/0x200 net/netfilter/core.c:626 nf_hook include/linux/netfilter.h:259 [inline] NF_HOOK+0x21d/0x3b0 include/linux/netfilter.h:302 __netif_receive_skb_one_core net/core/dev.c:5646 [inline] __netif_receive_skb+0xcc/0x290 net/core/dev.c:5760 process_backlog+0x380/0x710 net/core/dev.c:6088 __napi_poll+0xbb/0x460 net/core/dev.c:6650 napi_poll net/core/dev.c:6717 [inline] net_rx_action+0x65f/0xcc0 net/core/dev.c:6853 handle_softirqs+0x27d/0x820 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0xd3/0x190 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:bpf_prog_run_array include/linux/bpf.h:1992 [inline] RIP: 0010:trace_call_bpf+0x47c/0x6c0 kernel/trace/bpf_trace.c:143 Code: 4c 10 08 e9 dc fe ff ff e8 71 17 f6 ff e9 d2 fe ff ff e8 67 17 f6 ff 48 c7 c7 60 1e 19 8d 48 8b 74 24 18 e8 06 9e d3 02 eb 92 4f 17 f6 ff 4c 8b 6c 24 40 eb 0b e8 43 17 f6 ff 41 bf 01 00 00 RSP: 0018:ffffc90004a770a0 EFLAGS: 00000246 RAX: 1ffff11004832348 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: ffffc9000cf79000 RSI: ffffc90003172048 RDI: ffff888024191a40 RBP: ffffc90004a77198 R08: ffffc90004a7712f R09: 0000000000000000 R10: ffffc90004a77120 R11: fffff5200094ee26 R12: 0000000000000000 R13: ffff888024191a30 R14: ffff888024191a40 R15: 0000000000000000 perf_trace_run_bpf_submit+0x7a/0x1c0 kernel/events/core.c:10287 perf_trace_lock+0x303/0x3b0 include/trace/events/lock.h:50 trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x866/0x8c0 kernel/locking/lockdep.c:5765 __raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline] _raw_spin_unlock+0x16/0x40 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:391 [inline] free_unref_page+0x186/0x2e0 mm/page_alloc.c:2483 discard_slab mm/slub.c:2127 [inline] __unfreeze_partials+0x1cf/0x210 mm/slub.c:2667 put_cpu_partial+0x17c/0x250 mm/slub.c:2743 __slab_free+0x319/0x400 mm/slub.c:3700 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x75/0xd0 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:306 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:767 slab_alloc_node mm/slub.c:3495 [inline] __kmem_cache_alloc_node+0x194/0x250 mm/slub.c:3534 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc_node+0xa6/0x240 mm/slab_common.c:1014 kmalloc_array_node include/linux/slab.h:698 [inline] kcalloc_node include/linux/slab.h:703 [inline] memcg_alloc_slab_cgroups+0x85/0x120 mm/memcontrol.c:2928 memcg_slab_post_alloc_hook mm/slab.h:535 [inline] slab_post_alloc_hook+0xec/0x4d0 mm/slab.h:775 slab_alloc_node mm/slub.c:3495 [inline] slab_alloc mm/slub.c:3503 [inline] __kmem_cache_alloc_lru mm/slub.c:3510 [inline] kmem_cache_alloc+0x17e/0x2c0 mm/slub.c:3519 vm_area_dup+0x27/0x270 kernel/fork.c:502 dup_mmap kernel/fork.c:712 [inline] dup_mm kernel/fork.c:1694 [inline] copy_mm+0x11a6/0x1e30 kernel/fork.c:1743 copy_process+0x171d/0x3df0 kernel/fork.c:2508 kernel_clone+0x24b/0x8a0 kernel/fork.c:2917 __do_sys_clone kernel/fork.c:3060 [inline] __se_sys_clone kernel/fork.c:3044 [inline] __x64_sys_clone+0x1b7/0x230 kernel/fork.c:3044 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fa22db9de99 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:00007fa22eab8fd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fa22de25fa0 RCX: 00007fa22db9de99 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fa22dc33eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa22de26038 R14: 00007fa22de25fa0 R15: 00007fff2177f688 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 1145 Comm: kworker/u4:6 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:311 [inline] RIP: 0010:smp_call_function_many_cond+0xd85/0x1190 kernel/smp.c:855 Code: 45 8b 34 24 44 89 f6 83 e6 01 31 ff e8 54 f1 0a 00 41 83 e6 01 49 be 00 00 00 00 00 fc ff df 75 07 e8 8f ed 0a 00 eb 38 f3 90 <42> 0f b6 04 33 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 73 ed RSP: 0000:ffffc9000498f780 EFLAGS: 00000293 RAX: ffffffff817bf7fd RBX: 1ffff110171c87a9 RCX: ffff8880244f9e00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000498f900 R08: ffffffff911e7507 R09: 1ffffffff223cea0 R10: dffffc0000000000 R11: fffffbfff223cea1 R12: ffff8880b8e43d48 R13: ffff8880b8f3d3c0 R14: dffffc0000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f020f549030 CR3: 000000000cf32000 CR4: 00000000003506e0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1022 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2222 [inline] text_poke_bp_batch+0x31e/0x980 arch/x86/kernel/alternative.c:2432 text_poke_flush arch/x86/kernel/alternative.c:2623 [inline] text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2630 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x123/0x240 kernel/jump_label.c:207 static_key_enable+0x1a/0x20 kernel/jump_label.c:220 toggle_allocation_gate+0xa8/0x260 mm/kfence/core.c:847 process_one_work kernel/workqueue.c:2653 [inline] process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2730 worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2811 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293