R10: 00007ffcdae3ff00 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ff1898d8680 R15: 00007ff1898da000 sched: DL replenish lagged too much watchdog: BUG: soft lockup - CPU#1 stuck for 245s! [rm:6037] Modules linked in: irq event stamp: 88802 hardirqs last enabled at (88801): [] irqentry_exit+0x3b/0x90 kernel/entry/common.c:214 hardirqs last disabled at (88802): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1052 softirqs last enabled at (88790): [] softirq_handle_end kernel/softirq.c:468 [inline] softirqs last enabled at (88790): [] handle_softirqs+0x5be/0x8e0 kernel/softirq.c:650 softirqs last disabled at (88785): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (88785): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (88785): [] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 6037 Comm: rm Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xdfd/0x1600 kernel/smp.c:877 Code: 57 48 8b 54 24 10 4c 89 74 24 10 49 89 d5 48 89 d5 48 89 54 24 18 49 c1 ed 03 83 e5 07 4d 01 e5 83 c5 03 e8 75 0d 0c 00 f3 90 <41> 0f b6 45 00 40 38 c5 7c 08 84 c0 0f 85 e0 05 00 00 8b 43 08 31 RSP: 0018:ffffc900040ff920 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b8442680 RCX: ffffffff81b11b11 RDX: ffff88802d8adac0 RSI: ffffffff81b11aeb RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 R13: ffffed10170884d1 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888124ada000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff189679e9c CR3: 000000000e182000 CR4: 0000000000350ef0 Call Trace: on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1043 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline] flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline] flush_tlb_mm_range+0x4a0/0x17a0 arch/x86/mm/tlb.c:1451 tlb_flush arch/x86/include/asm/tlb.h:23 [inline] tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:490 [inline] tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:480 [inline] tlb_flush_mmu mm/mmu_gather.c:403 [inline] tlb_finish_mmu+0x3c9/0x7c0 mm/mmu_gather.c:497 exit_mmap+0x3fc/0xb90 mm/mmap.c:1293 __mmput+0x12a/0x410 kernel/fork.c:1133 mmput+0x62/0x70 kernel/fork.c:1156 exit_mm kernel/exit.c:582 [inline] do_exit+0x7c7/0x2bf0 kernel/exit.c:954 do_group_exit+0xd3/0x2a0 kernel/exit.c:1107 __do_sys_exit_group kernel/exit.c:1118 [inline] __se_sys_exit_group kernel/exit.c:1116 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1116 x64_sys_call+0x150b/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff1897d86c5 Code: Unable to access opcode bytes at 0x7ff1897d869b. RSP: 002b:00007ffcdae400d8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007ff1898d9fe8 RCX: 00007ff1897d86c5 RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000000 RBP: 0000000000000001 R08: 00007ffcdae40068 R09: 0000000000000000 R10: 00007ffcdae3ff00 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ff1898d8680 R15: 00007ff1898da000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 3514 Comm: kworker/u8:8 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Workqueue: ipv6_addrconf addrconf_dad_work RIP: 0010:hash_64_generic include/linux/hash.h:78 [inline] RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:3798 [inline] RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:3821 [inline] RIP: 0010:validate_chain kernel/locking/lockdep.c:3876 [inline] RIP: 0010:__lock_acquire+0xb8e/0x1c90 kernel/locking/lockdep.c:5237 Code: ff ff ff c7 44 24 2c 01 00 00 00 e9 fd f9 ff ff 4c 89 ef 48 89 14 24 48 bb eb 83 b5 80 46 86 c8 61 e8 36 a7 ff ff 4c 8b 04 24 <49> 0f af d8 48 c1 eb 2d 48 8d 04 dd 60 aa e8 96 48 89 04 24 48 8b RSP: 0018:ffffc90000007bf8 EFLAGS: 00000047 RAX: ffffffff95ab29a0 RBX: 61c8864680b583eb RCX: 00000000a0f0361f RDX: 2ad939879e9ec8e5 RSI: 0000000025106ffa RDI: ffff8880316b4878 RBP: ffff8880316b3c80 R08: 2ad939879e9ec8e5 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880316b47b0 R13: ffff8880316b4878 R14: 000000003376ab0b R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8881249da000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff1896f3440 CR3: 00000000773f7000 CR4: 0000000000350ef0 Call Trace: lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 debug_object_deactivate+0x135/0x3a0 lib/debugobjects.c:873 debug_hrtimer_deactivate kernel/time/hrtimer.c:443 [inline] debug_deactivate kernel/time/hrtimer.c:483 [inline] __run_hrtimer kernel/time/hrtimer.c:1745 [inline] __hrtimer_run_queues+0x46f/0xad0 kernel/time/hrtimer.c:1841 hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1903 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline] __sysvec_apic_timer_interrupt+0x10b/0x3f0 arch/x86/kernel/apic/apic.c:1058 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline] sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline] RIP: 0010:rcu_is_watching+0x41/0xc0 kernel/rcu/tree.c:751 Code: a5 93 89 c5 83 f8 07 0f 87 82 00 00 00 48 8d 3c ed e0 ce da 8d 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <75> 5c 48 03 1c ed e0 ce da 8d 48 b8 00 00 00 00 00 fc ff df 48 89 RSP: 0018:ffffc9000b617470 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffffffff93a592a8 RCX: 000000005e6a2396 RDX: 1ffffffff1bb59dc RSI: ffffffff8bf1e840 RDI: ffffffff8ddacee0 RBP: 0000000000000000 R08: e8feb071304891fb R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff81a82070 R13: ffffc9000b6174f8 R14: 0000000000000000 R15: ffff8880316b3c80 rcu_read_lock include/linux/rcupdate.h:868 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0xa3b/0x20a0 arch/x86/kernel/unwind_orc.c:479 arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56 kasan_save_track+0x14/0x30 mm/kasan/common.c:77 unpoison_slab_object mm/kasan/common.c:342 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:368 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4955 [inline] slab_alloc_node mm/slub.c:5265 [inline] kmem_cache_alloc_node_noprof+0x28a/0x770 mm/slub.c:5317 __alloc_skb+0x2b2/0x380 net/core/skbuff.c:660 alloc_skb include/linux/skbuff.h:1383 [inline] ndisc_alloc_skb+0xd8/0x530 net/ipv6/ndisc.c:420 ndisc_ns_create+0x15f/0x7b0 net/ipv6/ndisc.c:625 ndisc_send_ns+0xa9/0x140 net/ipv6/ndisc.c:667 addrconf_dad_work+0xbc9/0x14e0 net/ipv6/addrconf.c:4282 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3263 process_scheduled_works kernel/workqueue.c:3346 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245