watchdog: BUG: soft lockup - CPU#1 stuck for 144s! [syz.4.734:8838] Modules linked in: irq event stamp: 13964163 hardirqs last enabled at (13964162): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (13964163): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (13593792): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (13593792): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (13593792): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (13593795): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (13593795): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (13593795): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 8838 Comm: syz.4.734 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:101 [inline] RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:238 [inline] RIP: 0010:unwind_next_frame+0x4db/0x23c0 arch/x86/kernel/unwind_orc.c:510 Code: 4c 8b 7c 24 50 48 bd 00 00 00 00 00 fc ff df 4c 8b 64 24 20 4c 8b 6c 24 48 0f 84 72 15 00 00 e9 03 02 00 00 49 89 d5 48 89 d5 <48> 89 d8 48 29 e8 48 89 c1 48 c1 f9 02 48 c1 e8 3f 48 01 c8 48 83 RSP: 0018:ffffc90000a085f8 EFLAGS: 00000293 RAX: ffffffff908a8878 RBX: ffffffff908a8894 RCX: ffffffff908a8880 RDX: ffffffff908a8868 RSI: ffffffff9136db5e RDI: ffffffff8c27d320 RBP: ffffffff908a8880 R08: 000000000000000c R09: ffffffff8e75e5e0 R10: dffffc0000000000 R11: ffffffff81b0d0f0 R12: ffffffff8a3899c6 R13: ffffffff908a887c R14: ffffc90000a086c8 R15: ffffffff908a887c FS: 00007f7e385836c0(0000) GS:ffff888125553000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe8e97456b8 CR3: 0000000064686000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: 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_node_noprof+0x384/0x690 mm/slub.c:4918 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] 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:4042 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+0x15fb/0x52d0 kernel/sched/core.c:6922 Code: 2b 4c 89 e7 4c 89 ee e8 f3 41 82 f5 48 89 c7 e8 eb f6 e3 f5 31 ff 4d 39 ec 40 0f 95 c7 e8 0d 00 e4 f5 48 8b 84 24 d8 00 00 00 <66> 42 c7 44 30 0c f8 f8 48 c7 84 24 20 01 00 00 0e 36 e0 45 4a c7 RSP: 0018:ffffc90003ea6b40 EFLAGS: 00000202 RAX: 1ffff920007d4d8c RBX: ffff8880b873ae58 RCX: 0000000000000002 RDX: 0000000000000000 RSI: ffffffff8c27d360 RDI: ffffffff8c27d320 RBP: ffffc90003ea6d30 R08: ffffffff9011d9b7 R09: 1ffffffff2023b36 R10: dffffc0000000000 R11: fffffbfff2023b37 R12: ffff8880318f0000 R13: ffff8880338e8000 R14: dffffc0000000000 R15: 1ffff110170e772c preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7238 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:lock_acquire+0x20b/0x2e0 kernel/locking/lockdep.c:5872 Code: e9 30 ff ff ff e8 85 94 0e 0a f7 c3 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 01 42 7b 11 48 3b 44 24 30 75 33 fb 48 83 c4 38 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 3e 9f 73 RSP: 0018:ffffc90003ea6e60 EFLAGS: 00000296 RAX: 7dd31089bead4100 RBX: 0000000000000246 RCX: 0000000000000046 RDX: 0000000000000003 RSI: ffffffff8e16c058 RDI: ffffffff8c27d380 RBP: 0000000000000000 R08: 0000000000000004 R09: ffffffff9649d930 R10: 000000004427de1e R11: 00000000383f2bec R12: 0000000000000002 R13: ffffffff8e89f3b0 R14: 0000000000000000 R15: 0000000000000001 srcu_lock_acquire include/linux/srcu.h:187 [inline] srcu_read_lock+0x46/0x60 include/linux/srcu.h:294 kasan_quarantine_reduce+0x4c/0x160 mm/kasan/quarantine.c:259 __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:4538 [inline] slab_alloc_node mm/slub.c:4866 [inline] __do_kmalloc_node mm/slub.c:5259 [inline] __kvmalloc_node_noprof+0x4d7/0x8a0 mm/slub.c:6752 allocate_hook_entries_size net/netfilter/core.c:58 [inline] nf_hook_entries_grow+0x288/0x720 net/netfilter/core.c:137 __nf_register_net_hook+0x2c9/0x930 net/netfilter/core.c:432 nf_register_net_hook+0xb2/0x190 net/netfilter/core.c:575 nf_register_net_hooks+0x44/0x1b0 net/netfilter/core.c:591 nf_defrag_ipv4_enable+0x87/0x120 net/ipv4/netfilter/nf_defrag_ipv4.c:160 nft_tproxy_init+0x27c/0x4b0 net/netfilter/nft_tproxy.c:229 nf_tables_newexpr net/netfilter/nf_tables_api.c:3556 [inline] nf_tables_newrule+0x17ac/0x28b0 net/netfilter/nf_tables_api.c:4372 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:526 [inline] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:649 [inline] nfnetlink_rcv+0x1240/0x27b0 net/netfilter/nfnetlink.c:667 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0x972/0x9f0 net/socket.c:2592 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681 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: 0033:0x7f7e3779c819 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:00007f7e38583028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f7e37a15fa0 RCX: 00007f7e3779c819 RDX: 00000000040408c0 RSI: 0000200000000180 RDI: 000000000000000c RBP: 00007f7e37832c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7e37a16038 R14: 00007f7e37a15fa0 R15: 00007fff87b55848 Sending NMI from CPU 1 to CPUs 0: bridge0: received packet on veth0_to_bridge with own address as source address (addr:be:a1:46:74:80:ff, vlan:0) NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 8836 Comm: syz.0.733 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:check_wait_context kernel/locking/lockdep.c:-1 [inline] RIP: 0010:__lock_acquire+0x3b3/0x2cf0 kernel/locking/lockdep.c:5187 Code: 85 c0 74 1c 83 3d a0 79 70 0e 00 75 13 48 8d 3d a3 9a 73 0e 48 c7 c6 0c 91 01 8e 67 48 0f b9 3a 90 31 c0 0f b6 98 c4 00 00 00 <41> 8b 45 20 25 ff 1f 00 00 48 0f a3 05 4c 11 83 12 73 17 48 69 c0 RSP: 0018:ffffc90000006aa0 EFLAGS: 00000002 RAX: ffffffff93c5fd20 RBX: 0000000000000002 RCX: 0000000000000072 RDX: 0000000000080000 RSI: 0000000000006000 RDI: 0000000000000000 RBP: 0000000000000002 R08: ffffffff81b70aee R09: ffffffff8e411318 R10: dffffc0000000000 R11: fffff52000000da0 R12: 0000000000000072 R13: ffff88802dd02a28 R14: ffff88802dd01e80 R15: ffff88802dd029d8 FS: 00007fbcbd3fa6c0(0000) GS:ffff888125453000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000562146bb2a38 CR3: 00000000582a6000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868 __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 tick_do_update_jiffies64+0x6e/0x310 kernel/time/tick-sched.c:91 tick_limited_update_jiffies64 kernel/time/tick-sched.c:220 [inline] tick_sched_do_timer kernel/time/tick-sched.c:264 [inline] tick_nohz_handler+0x582/0x770 kernel/time/tick-sched.c:312 __run_hrtimer kernel/time/hrtimer.c:1785 [inline] __hrtimer_run_queues+0x4e7/0xcc0 kernel/time/hrtimer.c:1849 hrtimer_interrupt+0x42b/0x1010 kernel/time/hrtimer.c:1911 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:console_trylock_spinning kernel/printk/printk.c:2039 [inline] RIP: 0010:vprintk_emit+0x45d/0x560 kernel/printk/printk.c:2478 Code: 0f 84 44 ff ff ff e8 52 3f 21 00 fb eb 44 e8 4a 3f 21 00 e8 05 ad 0b 0a 4d 85 f6 74 94 e8 3b 3f 21 00 fb 48 c7 c7 00 0a 75 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 6b 16 RSP: 0018:ffffc90000007100 EFLAGS: 00000246 RAX: ffffffff81a47595 RBX: ffffffff81a4740f RCX: ffff88802dd01e80 RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffffffff8e750a00 RBP: ffffc900000071b0 R08: ffffffff9011d9b7 R09: 1ffffffff2023b36 R10: dffffc0000000000 R11: fffffbfff2023b37 R12: 0000000000000000 R13: 000000000000006f R14: 0000000000000200 R15: 1ffff92000000e24 _printk+0xdd/0x130 kernel/printk/printk.c:2504 br_fdb_update+0x62d/0x690 net/bridge/br_fdb.c:1003 br_handle_frame_finish+0x573/0x1bb0 net/bridge/br_input.c:144 br_nf_hook_thresh+0x3dd/0x4c0 net/bridge/br_netfilter_hooks.c:-1 br_nf_pre_routing_finish_ipv6+0xa3a/0xd70 net/bridge/br_netfilter_ipv6.c:-1 NF_HOOK include/linux/netfilter.h:318 [inline] br_nf_pre_routing_ipv6+0x374/0x6f0 net/bridge/br_netfilter_ipv6.c:184 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline] nf_hook_bridge_pre net/bridge/br_input.c:291 [inline] br_handle_frame+0x1277/0x1510 net/bridge/br_input.c:442 __netif_receive_skb_core+0x98f/0x31a0 net/core/dev.c:6068 __netif_receive_skb_one_core net/core/dev.c:6179 [inline] __netif_receive_skb net/core/dev.c:6294 [inline] process_backlog+0x76d/0x1950 net/core/dev.c:6645 __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:__schedule+0x15fb/0x52d0 kernel/sched/core.c:6922 Code: 2b 4c 89 e7 4c 89 ee e8 f3 41 82 f5 48 89 c7 e8 eb f6 e3 f5 31 ff 4d 39 ec 40 0f 95 c7 e8 0d 00 e4 f5 48 8b 84 24 d8 00 00 00 <66> 42 c7 44 30 0c f8 f8 48 c7 84 24 20 01 00 00 0e 36 e0 45 4a c7 RSP: 0018:ffffc9000566f520 EFLAGS: 00000202 RAX: 1ffff92000acdec8 RBX: ffff8880b863ae58 RCX: 0000000000000002 RDX: 0000000000000000 RSI: ffffffff8c27d360 RDI: ffffffff8c27d320 RBP: ffffc9000566f720 R08: ffffffff9011d9b7 R09: 1ffffffff2023b36 R10: dffffc0000000000 R11: fffffbfff2023b37 R12: ffff88802dd01e80 R13: ffff88801dac9e80 R14: dffffc0000000000 R15: 1ffff110170c772c preempt_schedule_notrace+0x57/0x90 kernel/sched/core.c:7188 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] percpu_ref_put_many include/linux/percpu-refcount.h:337 [inline] percpu_ref_put+0xf9/0x180 include/linux/percpu-refcount.h:351 css_put include/linux/cgroup_refcnt.h:79 [inline] obj_cgroup_charge_pages+0x6e/0xa0 mm/memcontrol.c:2864 obj_cgroup_charge_account+0xcf/0x650 mm/memcontrol.c:3160 pcpu_memcg_pre_alloc_hook mm/percpu.c:1628 [inline] pcpu_alloc_noprof+0x1ba/0x19c0 mm/percpu.c:1777 bpf_prog_alloc_no_stats+0x10e/0x4f0 kernel/bpf/core.c:115 bpf_prog_alloc+0x3c/0x1a0 kernel/bpf/core.c:155 bpf_prog_load+0x7ba/0x1ae0 kernel/bpf/syscall.c:2993 __sys_bpf+0x618/0x950 kernel/bpf/syscall.c:6266 __do_sys_bpf kernel/bpf/syscall.c:6379 [inline] __se_sys_bpf kernel/bpf/syscall.c:6377 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6377 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: 0033:0x7fbcbc59c819 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:00007fbcbd3fa028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fbcbc815fa0 RCX: 00007fbcbc59c819 RDX: 0000000000000094 RSI: 0000200000000500 RDI: 0000000000000005 RBP: 00007fbcbc632c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbcbc816038 R14: 00007fbcbc815fa0 R15: 00007fff331b73a8