kthread+0x324/0x3b0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
watchdog: BUG: soft lockup - CPU#1 stuck for 123s! [syz.0.1810:8435]
Modules linked in:
CPU: 1 PID: 8435 Comm: syz.0.1810 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:csd_lock_wait kernel/smp.c:229 [inline]
RIP: 0010:smp_call_function_single+0x211/0x490 kernel/smp.c:517
Code: ff e8 63 90 0a 00 41 83 e6 01 49 bc 00 00 00 00 00 fc ff df 75 0a e8 9e 8c 0a 00 e9 a4 00 00 00 f3 90 f7 44 24 48 01 00 00 00 <0f> 84 8f 00 00 00 e8 84 8c 0a 00 eb e9 e8 fd fb 22 03 89 c3 41 89
RSP: 0018:ffffc900012d7b80 EFLAGS: 00000202
RAX: ffffffff815a282c RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc900016d1000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc900012d7c70 R08: ffff8881f7057647 R09: 1ffff1103ee0aec8
R10: dffffc0000000000 R11: ffffed103ee0aec9 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff9200025af74
FS:  00007f5f5501a6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000006000 CR3: 000000013a766000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 bpf_prog_test_run_raw_tp+0x46d/0x670 net/bpf/test_run.c:356
 bpf_prog_test_run+0x34a/0x3c0 kernel/bpf/syscall.c:3156
 __do_sys_bpf kernel/bpf/syscall.c:4453 [inline]
 __se_sys_bpf+0x501/0x740 kernel/bpf/syscall.c:4391
 __x64_sys_bpf+0x7b/0x90 kernel/bpf/syscall.c:4391
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f5f565c1159
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:00007f5f5501a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f5f56848fa0 RCX: 00007f5f565c1159
RDX: 0000000000000050 RSI: 0000200000000700 RDI: 000000000000000a
RBP: 00007f5f5665806b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5f56849038 R14: 00007f5f56848fa0 R15: 00007ffff74d9918
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 2810 Comm: kworker/0:42 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: ipv6_addrconf addrconf_dad_work
RIP: 0010:native_halt arch/x86/include/asm/irqflags.h:66 [inline]
RIP: 0010:halt arch/x86/include/asm/irqflags.h:112 [inline]
RIP: 0010:kvm_wait+0xbe/0x130 arch/x86/kernel/kvm.c:921
Code: c1 e8 03 42 0f b6 04 30 84 c0 75 6d 0f b6 07 40 38 f0 75 26 41 f7 c4 00 02 00 00 75 0f 0f 1f 44 00 00 0f 00 2d 73 1d b8 03 f4 <eb> 0e 0f 1f 44 00 00 0f 00 2d 64 1d b8 03 fb f4 4c 89 64 24 18 ff
RSP: 0018:ffffc900000075c0 EFLAGS: 00000046
RAX: 0000000000000003 RBX: ffffffff86eaeb80 RCX: 0000000086eaeb00
RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffffffff86eaeb80
RBP: ffffc90000007670 R08: 0000000000000000 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff0dd5d70 R12: 0000000000000046
R13: 1aa1007391a8ae80 R14: dffffc0000000000 R15: 1ffff92000000ebc
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5f5684adac CR3: 0000000135c85000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 pv_wait arch/x86/include/asm/paravirt.h:564 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x72d/0xb80 kernel/locking/qspinlock.c:508
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:554 [inline]
 queued_spin_lock_slowpath+0x47/0x50 arch/x86/include/asm/qspinlock.h:51
 queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
 do_raw_spin_lock_flags include/linux/spinlock.h:196 [inline]
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:119 [inline]
 _raw_spin_lock_irqsave+0x120/0x130 kernel/locking/spinlock.c:159
 bpf_do_trace_printk+0xbe/0x260 kernel/trace/bpf_trace.c:396
 ____bpf_trace_printk kernel/trace/bpf_trace.c:541 [inline]
 bpf_trace_printk+0xcc9/0xd80 kernel/trace/bpf_trace.c:413
 bpf_prog_e2c5e1ee9969f238+0x35/0x9a0
 bpf_dispatcher_nop_func include/linux/bpf.h:669 [inline]
 trace_call_bpf+0x104/0x330 kernel/trace/bpf_trace.c:124
 perf_trace_run_bpf_submit+0x7c/0x1c0 kernel/events/core.c:9593
 perf_trace_bpf_trace_printk+0x2ae/0x350 kernel/trace/bpf_trace.h:11
 __traceiter_bpf_trace_printk+0x68/0xb0 kernel/trace/bpf_trace.h:11
 trace_bpf_trace_printk kernel/trace/bpf_trace.h:11 [inline]
 bpf_do_trace_printk+0x20b/0x260 kernel/trace/bpf_trace.c:403
 ____bpf_trace_printk kernel/trace/bpf_trace.c:541 [inline]
 bpf_trace_printk+0xcc9/0xd80 kernel/trace/bpf_trace.c:413
 bpf_prog_0605f9f479290f07+0x2f/0x884
 bpf_dispatcher_nop_func include/linux/bpf.h:669 [inline]
 __bpf_prog_test_run_raw_tp+0x8d/0x240 net/bpf/test_run.c:303
 flush_smp_call_function_queue+0x21d/0x6b0 kernel/smp.c:396
 generic_smp_call_function_single_interrupt+0x13/0x20 kernel/smp.c:318
 __sysvec_call_function_single+0x66/0x1b0 arch/x86/kernel/smp.c:248
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline]
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline]
 sysvec_call_function_single+0x85/0xd0 arch/x86/kernel/smp.c:243
 asm_sysvec_call_function_single+0x12/0x20 arch/x86/include/asm/idtentry.h:643
RIP: 0010:dst_cow_metrics_generic+0x0/0x1c0 net/core/dst.c:205
Code: 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 53 48 89 fb e8 b3 2d c3 fd 48 83 c3 a8 48 89 df e8 57 f8 ff ff 5b 5d c3 0f 1f 40 00 <55> 48 89 e5 41 57 41 56 41 55 41 54 53 49 89 f6 49 89 fc 48 bb 00
RSP: 0018:ffffc90000d777d8 EFLAGS: 00000246
RAX: 1ffff1102324d105 RBX: ffff88810c69c780 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff856eb741 RDI: ffff88810c69c780
RBP: ffffc90000d778d0 R08: ffff88810c69c80b R09: 1ffff110218d3901
R10: dffffc0000000000 R11: ffffed10218d3902 R12: 1ffff920001aef08
R13: ffffffff856eb741 R14: ffff888119268828 R15: ffff88810c69c780
 ndisc_send_skb+0x27c/0xbc0 net/ipv6/ndisc.c:493
 ndisc_send_ns+0x879/0xb10 net/ipv6/ndisc.c:655
 addrconf_dad_work+0xa40/0x1480 net/ipv6/addrconf.c:4216
 process_one_work+0x6fd/0xbc0 kernel/workqueue.c:2301
 worker_thread+0xa8e/0x13c0 kernel/workqueue.c:2447
 kthread+0x324/0x3b0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298