watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.3.21:6060] Modules linked in: irq event stamp: 13496505 hardirqs last enabled at (13496504): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:200 hardirqs last disabled at (13496505): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050 softirqs last enabled at (13133856): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (13133856): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (13133856): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (13133859): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (13133859): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (13133859): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 6060 Comm: syz.3.21 Not tainted 6.16.0-syzkaller-g0e260fc798bf #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:448 [inline] RIP: 0010:find_match+0x131/0xc90 net/ipv6/route.c:780 Code: a5 84 90 f7 49 bc 00 00 00 00 00 fc ff df 48 85 db 0f 84 05 0a 00 00 48 81 c3 58 06 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 20 <84> c0 0f 85 32 0a 00 00 8b 1b 31 ff 89 de e8 ac 88 90 f7 85 db 74 RSP: 0018:ffffc90000007100 EFLAGS: 00000a02 RAX: 0000000000000000 RBX: ffff8880798fb658 RCX: ffff88802c063c00 RDX: 0000000000000100 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 1ffff1100b15bc99 R08: ffffc90000007400 R09: ffffc90000007410 R10: ffffc90000007260 R11: fffff52000000e4e R12: dffffc0000000000 R13: 0000000000000003 R14: 1ffff1100b15bc9b R15: ffff888058ade4df FS: 00007fa2fc3c06c0(0000) GS:ffff888125c2a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1aa0e5f1b0 CR3: 0000000027ebc000 CR4: 00000000003526f0 Call Trace: __find_rr_leaf+0x23a/0x6d0 net/ipv6/route.c:868 find_rr_leaf net/ipv6/route.c:889 [inline] rt6_select net/ipv6/route.c:933 [inline] fib6_table_lookup+0x39f/0xa80 net/ipv6/route.c:2233 ip6_pol_route+0x222/0x1180 net/ipv6/route.c:2269 pol_lookup_func include/net/ip6_fib.h:617 [inline] fib6_rule_lookup+0x52f/0x6f0 net/ipv6/fib6_rules.c:120 ip6_route_input_lookup net/ipv6/route.c:2338 [inline] ip6_route_input+0x6ce/0xa50 net/ipv6/route.c:2641 ip6_rcv_finish+0x141/0x2e0 net/ipv6/ip6_input.c:77 NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318 __netif_receive_skb_one_core net/core/dev.c:5979 [inline] __netif_receive_skb+0xd3/0x380 net/core/dev.c:6092 process_backlog+0x60e/0x14f0 net/core/dev.c:6444 __napi_poll+0xc7/0x360 net/core/dev.c:7497 napi_poll net/core/dev.c:7560 [inline] net_rx_action+0x707/0xe30 net/core/dev.c:7687 handle_softirqs+0x286/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:finish_task_switch+0x26b/0x950 kernel/sched/core.c:5225 Code: 0f 84 3c 01 00 00 48 85 db 0f 85 63 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 6f e1 e8 09 e8 1a 28 36 00 fb 4c 8b 65 c0 <49> 8d bc 24 18 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 RSP: 0018:ffffc9000488f9d8 EFLAGS: 00000286 RAX: ab1dc98176e5e700 RBX: 0000000000000000 RCX: ab1dc98176e5e700 RDX: 0000000000000000 RSI: ffffffff8d9b15f8 RDI: ffffffff8be2fd00 RBP: ffffc9000488fa30 R08: ffffffff8fa32437 R09: 1ffffffff1f46486 R10: dffffc0000000000 R11: fffffbfff1f46487 R12: ffff88802c063c00 R13: dffffc0000000000 R14: ffff8881404e1e00 R15: ffff8880b863ab58 context_switch kernel/sched/core.c:5360 [inline] __schedule+0x17a0/0x4cc0 kernel/sched/core.c:6961 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7288 irqentry_exit+0x6f/0x90 kernel/entry/common.c:197 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__do_sys_futex kernel/futex/syscalls.c:179 [inline] RIP: 0010:__se_sys_futex+0x36f/0x400 kernel/futex/syscalls.c:160 Code: 67 4e 0c 00 4c 8b 7c 24 08 4c 8b 44 24 28 48 8b 54 24 20 48 8b 74 24 10 48 8b 7c 24 18 4c 89 e1 45 89 f1 41 57 e8 61 f7 ff ff <48> 83 c4 08 48 8b 4c 24 30 48 c7 44 24 40 0e 36 e0 45 48 c7 04 19 RSP: 0018:ffffc9000488fdd8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ab1dc98176e5e700 RDX: ffffc9000c9dc000 RSI: 000000000000ea9d RDI: 000000000000ea9e RBP: ffffc9000488fee0 R08: 0000000000000000 R09: ffffffff81b2ce8b R10: dffffc0000000000 R11: ffffed100f4ff069 R12: 0000000000000001 R13: ffffc9000488fe60 R14: 0000000000000006 R15: 0000000000000000 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa2fb58ebe9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa2fc3c00e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007fa2fb7b5fa8 RCX: 00007fa2fb58ebe9 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fa2fb7b5fac RBP: 00007fa2fb7b5fa0 R08: 7fffffffffffffff R09: 0000000000000000 R10: 0000000000000006 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa2fb7b6038 R14: 00007ffcb44412c0 R15: 00007ffcb44413a8 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6068 Comm: syz.1.20 Not tainted 6.16.0-syzkaller-g0e260fc798bf #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xd33/0x12d0 kernel/smp.c:877 Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 d6 59 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 81 55 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 65 55 RSP: 0018:ffffc9000490f340 EFLAGS: 00000293 RAX: ffffffff81b4498b RBX: 1ffff110170c8341 RCX: ffff88802c603c00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000490f4c0 R08: ffffffff8fa32437 R09: 1ffffffff1f46486 R10: dffffc0000000000 R11: fffffbfff1f46487 R12: ffff8880b8641a08 R13: dffffc0000000000 R14: ffff8880b873b1c0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125d2a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b33523ffc CR3: 000000000df36000 CR4: 00000000003526f0 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1044 __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+0x6b1/0x12d0 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+0x1a7/0x680 mm/mmu_gather.c:403 tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:497 free_ldt_pgtables+0x17b/0x320 arch/x86/kernel/ldt.c:411 arch_exit_mmap arch/x86/include/asm/mmu_context.h:234 [inline] exit_mmap+0x17c/0xb50 mm/mmap.c:1266 __mmput+0x118/0x430 kernel/fork.c:1127 exit_mm+0x1da/0x2c0 kernel/exit.c:582 do_exit+0x648/0x2300 kernel/exit.c:954 do_group_exit+0x21c/0x2d0 kernel/exit.c:1107 get_signal+0x1286/0x1340 kernel/signal.c:3034 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4fc498ebe9 Code: Unable to access opcode bytes at 0x7f4fc498ebbf. RSP: 002b:00007f4fc578d0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f4fc4bb6098 RCX: 00007f4fc498ebe9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f4fc4bb6098 RBP: 00007f4fc4bb6090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4fc4bb6128 R14: 00007ffc9d526b00 R15: 00007ffc9d526be8