watchdog: BUG: soft lockup - CPU#1 stuck for 128s! [kworker/u8:8:1403] Modules linked in: irq event stamp: 559159 hardirqs last enabled at (559158): [] __local_bh_enable_ip+0xd6/0x140 kernel/softirq.c:478 hardirqs last disabled at (559159): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1062 softirqs last enabled at (554190): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last enabled at (554190): [] __alloc_skb+0x18d/0x7a0 net/core/skbuff.c:698 softirqs last disabled at (554193): [] __do_softirq kernel/softirq.c:703 [inline] softirqs last disabled at (554193): [] invoke_softirq kernel/softirq.c:542 [inline] softirqs last disabled at (554193): [] __irq_exit_rcu+0xc6/0x220 kernel/softirq.c:786 CPU: 1 UID: 0 PID: 1403 Comm: kworker/u8:8 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 Workqueue: events_unbound nsim_dev_trap_report_work RIP: 0010:lock_is_held_type+0x106/0x150 kernel/locking/lockdep.c:6021 Code: 1c 00 00 b8 ff ff ff ff 65 0f c1 05 8c 6e dd 08 83 f8 01 75 25 9c 58 a9 00 02 00 00 75 39 41 f7 c4 00 02 00 00 74 01 fb 89 d8 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 0b 10 03 00 cc 90 0f 0b 90 48 c7 RSP: 0018:ffffc90000a08308 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000102 RDX: ffff88802a640000 RSI: ffffffff8e93267b RDI: ffffffff8c8e9e80 RBP: 00000000ffffffff R08: 0000000000000100 R09: 0000000000000000 R10: ffffc90000a083c0 R11: fffff5200014107a R12: 0000000000000246 R13: ffff88802a640000 R14: ffffffff9015a320 R15: 0000000000000005 FS: 0000000000000000(0000) GS:ffff888123513000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f299b81b3e5 CR3: 00000000774d0000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: bpf_prog_run_array include/linux/bpf.h:2777 [inline] trace_call_bpf+0x1f3/0xb80 kernel/trace/bpf_trace.c:147 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:11524 do_perf_trace_lock include/trace/events/lock.h:49 [inline] perf_trace_lock+0x32e/0x410 include/trace/events/lock.h:49 __do_trace_lock_release include/trace/events/lock.h:68 [inline] trace_lock_release include/trace/events/lock.h:68 [inline] lock_release+0x396/0x3c0 kernel/locking/lockdep.c:5954 rcu_lock_release include/linux/rcupdate.h:319 [inline] rcu_read_unlock include/linux/rcupdate.h:880 [inline] class_rcu_destructor include/linux/rcupdate.h:1216 [inline] unwind_next_frame+0x1baa/0x2550 arch/x86/kernel/unwind_orc.c:709 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:351 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:377 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4720 [inline] slab_alloc_node mm/slub.c:5033 [inline] kmem_cache_alloc_node_noprof+0x34f/0x600 mm/slub.c:5105 kmalloc_reserve net/core/skbuff.c:616 [inline] __alloc_skb+0x27a/0x7a0 net/core/skbuff.c:716 alloc_skb include/linux/skbuff.h:1390 [inline] ndisc_alloc_skb+0xa0/0x480 net/ipv6/ndisc.c:421 ndisc_send_rs+0x288/0x6b0 net/ipv6/ndisc.c:708 addrconf_rs_timer+0x2d2/0x6c0 net/ipv6/addrconf.c:4098 call_timer_fn+0x18d/0x5f0 kernel/time/timer.c:1749 expire_timers kernel/time/timer.c:1800 [inline] __run_timers kernel/time/timer.c:2375 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2387 run_timer_base kernel/time/timer.c:2396 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2406 handle_softirqs+0x265/0x8d0 kernel/softirq.c:669 __do_softirq kernel/softirq.c:703 [inline] invoke_softirq kernel/softirq.c:542 [inline] __irq_exit_rcu+0xc6/0x220 kernel/softirq.c:786 irq_exit_rcu+0x9/0x30 kernel/softirq.c:809 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:memset_orig+0x4a/0xb0 arch/x86/lib/memset_64.S:75 Code: d1 48 c1 e9 06 74 39 66 0f 1f 84 00 00 00 00 00 48 ff c9 48 89 07 48 89 47 08 48 89 47 10 48 89 47 18 48 89 47 20 48 89 47 28 <48> 89 47 30 48 89 47 38 48 8d 7f 40 75 d8 0f 1f 84 00 00 00 00 00 RSP: 0018:ffffc90005977940 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffff88804d690000 RCX: 000000000000000e RDX: 0000000000001000 RSI: 0000000000000000 RDI: ffff88804d690c40 RBP: 0000000000082820 R08: ffffc9000597770f R09: 0000000000000000 R10: ffff88804d690000 R11: ffffffffa0401314 R12: ffff88813ff29140 R13: 0000000000001000 R14: 0000000000001000 R15: ffff8880b8340801 slab_post_alloc_hook mm/slub.c:4730 [inline] slab_alloc_node mm/slub.c:5033 [inline] __do_kmalloc_node mm/slub.c:5530 [inline] __kmalloc_node_track_caller_noprof+0x483/0x720 mm/slub.c:5662 kmalloc_reserve net/core/skbuff.c:638 [inline] __alloc_skb+0x2c1/0x7a0 net/core/skbuff.c:716 alloc_skb include/linux/skbuff.h:1390 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:744 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:801 [inline] nsim_dev_trap_report_work+0x25f/0xb30 drivers/net/netdevsim/dev.c:847 process_one_work kernel/workqueue.c:3495 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 5296 Comm: dhcpcd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 RIP: 0010:csd_lock_wait kernel/smp.c:389 [inline] RIP: 0010:csd_lock kernel/smp.c:422 [inline] RIP: 0010:smp_call_function_many_cond+0x61e/0x1500 kernel/smp.c:970 Code: b6 04 04 84 c0 0f 85 d5 03 00 00 44 8b 3b 44 89 fe 83 e6 01 31 ff e8 51 7a 0c 00 41 83 e7 01 75 07 e8 36 75 0c 00 eb 3f f3 90 <48> b8 00 00 00 00 00 fc ff df 41 0f b6 04 04 84 c0 75 0f f7 03 01 RSP: 0018:ffffc9000354f420 EFLAGS: 00000293 RAX: ffffffff81bca0ee RBX: ffff8880b8341d88 RCX: ffff888032083e80 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000354f570 R08: ffff88803208541f R09: 1ffff11006410a83 R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffff110170683b1 R13: 0000000000000001 R14: ffff8880b8341d80 R15: 0000000000000001 FS: 00007f95b27e9780(0000) GS:ffff888123413000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000559a574d19b0 CR3: 000000007fd66000 CR4: 00000000003526f0 DR0: 0000200000000180 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __flush_tlb_multi arch/x86/include/asm/paravirt.h:46 [inline] flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline] flush_tlb_mm_range+0x910/0x10b0 arch/x86/mm/tlb.c:1435 dup_mmap+0x17dd/0x1e10 mm/mmap.c:1884 dup_mm kernel/fork.c:1542 [inline] copy_mm+0x115/0x470 kernel/fork.c:1594 copy_process+0x1ecc/0x44b0 kernel/fork.c:2320 kernel_clone+0x2d7/0x940 kernel/fork.c:2784 __do_sys_clone kernel/fork.c:2926 [inline] __se_sys_clone kernel/fork.c:2910 [inline] __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2910 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f95b28bd636 Code: 89 df e8 6d e8 f6 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 52 89 c5 85 c0 75 31 64 48 8b 04 25 10 00 00 RSP: 002b:00007ffcc2df7aa0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffcc2df7aa8 RCX: 00007f95b28bd636 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffcc2e17ff0 R08: 0000000000000000 R09: 0000000000000001 R10: 00007f95b27e9a50 R11: 0000000000000246 R12: 00007ffcc2df7be0 R13: 0000000000000000 R14: 0000000000000000 R15: 00005635e4286ac0