watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [syz.4.675:8639] Modules linked in: irq event stamp: 12125895 hardirqs last enabled at (12125894): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (12125895): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (300660): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (300660): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (300660): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (300663): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (300663): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (300663): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 8639 Comm: syz.4.675 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/27/2026 RIP: 0010:lock_acquire+0x20b/0x2e0 kernel/locking/lockdep.c:5872 Code: e9 30 ff ff ff e8 35 59 0c 0a f7 c3 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 b1 46 7a 11 48 3b 44 24 30 75 33 fb 48 83 c4 38 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 16 3f 0f 0a cc 48 8d 3d 3e 55 73 RSP: 0018:ffffc90000a081b8 EFLAGS: 00000286 RAX: 94840a4b59c6db00 RBX: 0000000000000246 RCX: 0000000000000503 RDX: 000000002b035410 RSI: ffffffff8e1655c0 RDI: ffffffff8c27b380 RBP: 0000000000000000 R08: ffffffff81767de5 R09: ffffffff8e75e3e0 R10: ffffc90000a07fa0 R11: ffffffff81b0bfa0 R12: 0000000000000002 R13: ffffffff8e75e3e0 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f46f49f66c0(0000) GS:ffff888125563000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055558c6fa4e8 CR3: 000000007e810000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:312 [inline] rcu_read_lock include/linux/rcupdate.h:850 [inline] class_rcu_constructor include/linux/rcupdate.h:1193 [inline] unwind_next_frame+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495 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:4542 [inline] slab_alloc_node mm/slub.c:4869 [inline] kmem_cache_alloc_node_noprof+0x384/0x690 mm/slub.c:4921 kmalloc_reserve net/core/skbuff.c:613 [inline] __alloc_skb+0x27d/0x7d0 net/core/skbuff.c:713 alloc_skb include/linux/skbuff.h:1383 [inline] nlmsg_new include/net/netlink.h:1055 [inline] __neigh_notify+0x15c/0x310 net/core/neighbour.c:3573 neigh_notify net/core/neighbour.c:3595 [inline] neigh_cleanup_and_release+0xae/0x2e0 net/core/neighbour.c:119 neigh_remove_one+0x46d/0x4c0 net/core/neighbour.c:249 neigh_forced_gc net/core/neighbour.c:280 [inline] neigh_alloc net/core/neighbour.c:512 [inline] ___neigh_create+0x485/0x2280 net/core/neighbour.c:655 ip6_finish_output2+0x729/0x13e0 net/ipv6/ip6_output.c:128 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x340/0x550 net/ipv6/ip6_output.c:246 dst_output include/net/dst.h:470 [inline] NF_HOOK include/linux/netfilter.h:318 [inline] ndisc_send_skb+0xd0b/0x1670 net/ipv6/ndisc.c:512 addrconf_rs_timer+0x395/0x6d0 net/ipv6/addrconf.c:4041 call_timer_fn+0x192/0x640 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/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:__schedule+0x13c/0x52d0 kernel/sched/core.c:6781 Code: 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 5b 2b 81 f6 4c 8b 23 49 8d 9c 24 98 7d 1d 93 49 89 df 49 c1 ef 03 43 80 3c 37 00 <74> 08 48 89 df e8 3a 2b 81 f6 48 89 5c 24 30 48 8b 03 48 89 44 24 RSP: 0018:ffffc9000c0ff320 EFLAGS: 00000246 RAX: 1ffffffff1c35af3 RBX: ffff8880b873ad98 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8c27b360 RDI: ffffffff8c27b320 RBP: ffffc9000c0ff520 R08: ffffffff90118bb7 R09: 1ffffffff2023176 R10: dffffc0000000000 R11: fffffbfff2023177 R12: ffff888125563000 R13: 0000000000000001 R14: dffffc0000000000 R15: 1ffff110170e75b3 preempt_schedule_notrace+0x57/0x90 kernel/sched/core.c:7185 preempt_schedule_notrace_thunk+0x16/0x30 arch/x86/entry/thunk.S:13 class_preempt_notrace_destructor include/linux/preempt.h:469 [inline] perf_trace_lock+0x38b/0x410 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+0x392/0x3d0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:322 [inline] rcu_read_unlock include/linux/rcupdate.h:881 [inline] class_rcu_destructor include/linux/rcupdate.h:1193 [inline] is_module_text_address+0x18b/0x1e0 kernel/module/main.c:3859 kernel_text_address+0x94/0xe0 kernel/extable.c:119 __kernel_text_address+0xd/0x30 kernel/extable.c:79 unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:385 arch_stack_walk+0xfb/0x150 arch/x86/kernel/stacktrace.c:26 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 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x31c/0x660 mm/slub.c:5383 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] ref_tracker_alloc+0x15a/0x4c0 lib/ref_tracker.c:270 __netns_tracker_alloc include/net/net_namespace.h:367 [inline] netns_tracker_alloc include/net/net_namespace.h:376 [inline] get_net_track+0x16e/0x230 include/net/net_namespace.h:393 sk_alloc+0x1d6/0x390 net/core/sock.c:2318 __netlink_create+0x65/0x260 net/netlink/af_netlink.c:626 netlink_create+0x3ca/0x590 net/netlink/af_netlink.c:684 __sock_create+0x4b2/0x9d0 net/socket.c:1605 sock_create net/socket.c:1663 [inline] __sys_socket_create net/socket.c:1700 [inline] __sys_socket+0xd6/0x1b0 net/socket.c:1747 __do_sys_socket net/socket.c:1761 [inline] __se_sys_socket net/socket.c:1759 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1759 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: 0033:0x7f46f679c799 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:00007f46f49f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007f46f6a16180 RCX: 00007f46f679c799 RDX: 000000000000000c RSI: 0000000000000003 RDI: 0000000000000010 RBP: 00007f46f6832c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f46f6a16218 R14: 00007f46f6a16180 R15: 00007ffd501b4a28 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 8638 Comm: syz.4.675 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/27/2026 RIP: 0010:check_preemption_disabled+0x1/0xe0 lib/smp_processor_id.c:13 Code: 20 b3 27 8c 48 c7 c6 60 b3 27 8c eb 1c 66 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 55 <41> 57 41 56 53 65 8b 05 57 d3 6d 07 65 8b 0d 4c d3 6d 07 f7 c1 ff RSP: 0018:ffffc90000007350 EFLAGS: 00000046 RAX: ce497eba3a6f06c2 RBX: 0000000000000087 RCX: 0000000000010303 RDX: 0000000000000006 RSI: ffffffff8e1655c0 RDI: ffffffff8c27b380 RBP: ffff88802c0d2ac8 R08: ffffc9000000718f R09: 0000000000000000 R10: ffffc90000007180 R11: ffffffffa0205150 R12: 0000000000000006 R13: 0000000000000006 R14: ffff8880b8628298 R15: ffff88802c0d1e80 FS: 00007f46f75826c0(0000) GS:ffff888125463000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564b5b439168 CR3: 000000007e810000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline] lock_release+0x259/0x3d0 kernel/locking/lockdep.c:5891 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:176 [inline] _raw_spin_unlock_irqrestore+0x1b/0x80 kernel/locking/spinlock.c:194 hrtimer_interrupt+0xafe/0x1010 kernel/time/hrtimer.c:1921 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x102/0x460 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:trylock_clear_pending kernel/locking/qspinlock_paravirt.h:122 [inline] RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:431 [inline] RIP: 0010:__pv_queued_spin_lock_slowpath+0x627/0xbc0 kernel/locking/qspinlock.c:325 Code: 43 0f b6 04 26 84 c0 0f 85 7c 01 00 00 c6 01 01 41 bc 00 80 ff ff 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 28 c6 44 01 06 02 <66> c7 84 24 90 00 00 00 00 01 48 8b 4c 24 48 0f b6 04 01 84 c0 75 RSP: 0018:ffffc90000007600 EFLAGS: 00000286 RAX: dffffc0000000000 RBX: ffffc900000076a0 RCX: 1ffff92000000ecc RDX: 0000000000000100 RSI: ffffffff8def4b65 RDI: ffff8880b863bcc0 RBP: ffffc90000007710 R08: ffffffff90118bb7 R09: 1ffffffff2023176 R10: dffffc0000000000 R11: fffffbfff2023177 R12: 00000000ffff9c09 R13: 0000000000000000 R14: 1ffffffff1f9efb0 R15: ffff8880b863bcd4 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:35 [inline] queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:66 [inline] queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x26c/0x2f0 kernel/locking/spinlock_debug.c:116 spin_lock_bh include/linux/spinlock.h:347 [inline] neigh_forced_gc net/core/neighbour.c:265 [inline] neigh_alloc net/core/neighbour.c:512 [inline] ___neigh_create+0x209/0x2280 net/core/neighbour.c:655 ip6_finish_output2+0x729/0x13e0 net/ipv6/ip6_output.c:128 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x340/0x550 net/ipv6/ip6_output.c:246 dst_output include/net/dst.h:470 [inline] NF_HOOK include/linux/netfilter.h:318 [inline] ndisc_send_skb+0xd0b/0x1670 net/ipv6/ndisc.c:512 addrconf_rs_timer+0x395/0x6d0 net/ipv6/addrconf.c:4041 call_timer_fn+0x192/0x640 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/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:finish_task_switch+0x245/0x920 kernel/sched/core.c:5152 Code: 00 00 48 85 db 0f 85 e8 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 49 83 c4 48 4c 89 e7 e8 85 89 1b 0a e8 b0 8e 38 00 fb 4c 8b 65 c0 <49> 8d bc 24 70 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 RSP: 0018:ffffc90005f16d18 EFLAGS: 00000206 RAX: 00000000006dab7b RBX: 0000000000000000 RCX: 0000000080000001 RDX: 0000000000000007 RSI: ffffffff8def4b65 RDI: ffffffff8c27b380 RBP: ffffc90005f16d70 R08: ffffffff90118bb7 R09: 1ffffffff2023176 R10: dffffc0000000000 R11: fffffbfff2023177 R12: ffff88802c0d1e80 R13: dffffc0000000000 R14: ffff888028bd5b80 R15: ffff8880b863b918 context_switch kernel/sched/core.c:5298 [inline] __schedule+0x15e5/0x52d0 kernel/sched/core.c:6908 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7235 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:preempt_schedule_notrace_thunk+0x0/0x30 arch/x86/entry/thunk.S:13 Code: 41 5b 41 5a 41 59 41 58 58 59 5a 5e 5f 5d e9 87 1a 7d 0a 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <55> 48 89 e5 57 56 52 51 50 41 50 41 51 41 52 41 53 e8 5a 65 7b 0a RSP: 0018:ffffc90005f170b8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffe8ffffcd5010 RCX: 0000000000000000 RDX: ffffc9000d2e3000 RSI: 0000000000004ca3 RDI: 0000000000004ca4 RBP: ffffc90005f171c0 R08: ffffc90005f16fef R09: 0000000000000000 R10: ffffc90005f16fe0 R11: ffffffffa0205150 R12: dffffc0000000000 R13: dffffc0000000000 R14: 000000000000002c R15: 1ffff92000be2e20 class_preempt_notrace_destructor include/linux/preempt.h:469 [inline] perf_trace_lock+0x38b/0x410 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+0x392/0x3d0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:322 [inline] rcu_read_unlock include/linux/rcupdate.h:881 [inline] class_rcu_destructor include/linux/rcupdate.h:1193 [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+0xc2b/0xdb0 mm/page_alloc.c:2978 __slab_free+0x263/0x2b0 mm/slub.c:5576 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:4542 [inline] slab_alloc_node mm/slub.c:4869 [inline] __kmalloc_cache_node_noprof+0x391/0x6b0 mm/slub.c:5391 kmalloc_node_noprof include/linux/slab.h:1077 [inline] __get_vm_area_node+0x13f/0x300 mm/vmalloc.c:3221 __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:107 bpf_prog_alloc+0x3c/0x1a0 kernel/bpf/core.c:156 bpf_prog_load+0x7ba/0x1ae0 kernel/bpf/syscall.c:2993 __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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f46f679c799 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:00007f46f7582028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f46f6a16090 RCX: 00007f46f679c799 RDX: 0000000000000094 RSI: 00002000000000c0 RDI: 0000000000000005 RBP: 00007f46f6832c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f46f6a16128 R14: 00007f46f6a16090 R15: 00007ffd501b4a28