INFO: task syz.6.5414:17482 blocked for more than 123 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.6.5414 state:D stack:0 pid:17482 tgid:17481 ppid:12751 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5996 [inline] __schedule+0x134f/0x1ea0 kernel/sched/core.c:7843 __schedule_loop kernel/sched/core.c:7924 [inline] schedule+0xc5/0x240 kernel/sched/core.c:7939 schedule_timeout+0xc7/0x3b0 kernel/time/timer.c:2596 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common kernel/sched/completion.c:116 [inline] wait_for_common+0x369/0x650 kernel/sched/completion.c:127 wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148 rcu_barrier+0x415/0x540 kernel/rcu/tree.c:4657 kvm_mmu_uninit_tdp_mmu+0x1df/0x210 arch/x86/kvm/mmu/tdp_mmu.c:51 kvm_mmu_uninit_vm+0x27/0x60 arch/x86/kvm/mmu/mmu.c:6572 kvm_arch_destroy_vm+0x398/0x420 arch/x86/kvm/x86.c:12961 kvm_destroy_vm virt/kvm/kvm_main.c:1355 [inline] kvm_put_kvm+0xb04/0x12c0 virt/kvm/kvm_main.c:1392 kvm_vm_release+0x47/0x70 virt/kvm/kvm_main.c:1415 __fput+0x1fe/0xa00 fs/file_table.c:429 ____fput+0x20/0x30 fs/file_table.c:457 task_work_run+0x1e5/0x260 kernel/task_work.c:246 exit_task_work include/linux/task_work.h:43 [inline] do_exit+0x9e3/0x2650 kernel/exit.c:953 do_group_exit+0x229/0x2f0 kernel/exit.c:1095 get_signal+0x1398/0x14e0 kernel/signal.c:2933 arch_do_signal_or_restart+0xbc/0x760 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x57/0xb0 kernel/entry/common.c:218 do_syscall_64+0x63/0xf0 arch/x86/entry/common.c:84 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7fd91819c2bb RSP: 002b:00007fd919041f00 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: fffffffffffffffc RBX: 0000000000000003 RCX: 00007fd91819c2bb RDX: 00007fd919042fd0 RSI: 0000000080085502 RDI: 0000000000000003 RBP: 00007fd919042fd0 R08: 0000000000000001 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 0000000080085502 R13: 0000000800000000 R14: 0000000000000002 R15: 00007fd918250adc NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 e74179280c147a83e3a201a5967fe5af4e04851c Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:94 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120 dump_stack+0x19/0x20 lib/dump_stack.c:129 nmi_cpu_backtrace+0x2ba/0x2d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline] watchdog+0xdad/0xf00 kernel/hung_task.c:423 kthread+0x2c9/0x370 kernel/kthread.c:389 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 282 Comm: syz-executor Not tainted syzkaller #0 e74179280c147a83e3a201a5967fe5af4e04851c Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:find_stack lib/stackdepot.c:552 [inline] RIP: 0010:stack_depot_save_flags+0x176/0x800 lib/stackdepot.c:618 Code: c4 c1 c0 18 41 29 c4 48 8b 05 36 61 d9 05 8b 0d 28 61 d9 05 44 21 e1 48 c1 e1 04 48 8d 14 08 65 ff 05 56 91 1e 7d 4c 8b 2c 08 <49> 39 d5 0f 84 80 00 00 00 45 89 d7 eb 09 4d 8b 6d 00 49 39 d5 74 RSP: 0018:ffffc90000006c10 EFLAGS: 00000202 RAX: ffff8881f5200000 RBX: 0000000000002920 RCX: 0000000000763eb0 RDX: ffff8881f5963eb0 RSI: 0000000000000001 RDI: 00000000ca8ea396 RBP: ffffc90000006c70 R08: 00000000428be669 R09: 0000000061524c01 R10: 000000000000001a R11: ffffffff8175cbd0 R12: 000000001eb763eb R13: ffff88816b07dea0 R14: ffffc90000006c80 R15: ffffc90000006c80 FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0710347e20 CR3: 000000010c794000 CR4: 00000000003526b0 DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083 DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: kasan_save_stack mm/kasan/common.c:50 [inline] kasan_save_track+0x4f/0x80 mm/kasan/common.c:70 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:565 poison_kmalloc_redzone mm/kasan/common.c:379 [inline] __kasan_kmalloc+0x96/0xb0 mm/kasan/common.c:396 kasan_kmalloc include/linux/kasan.h:261 [inline] __kmalloc_cache_noprof+0x23c/0x470 mm/slub.c:4426 kmalloc_noprof include/linux/slab.h:881 [inline] kzalloc_noprof include/linux/slab.h:1017 [inline] ref_tracker_alloc+0x184/0x590 lib/ref_tracker.c:203 __netdev_tracker_alloc include/linux/netdevice.h:4109 [inline] netdev_hold include/linux/netdevice.h:4138 [inline] dst_init+0xcf/0x420 net/core/dst.c:52 dst_alloc+0x163/0x250 net/core/dst.c:93 ip6_dst_alloc net/ipv6/route.c:342 [inline] icmp6_dst_alloc+0xef/0x4f0 net/ipv6/route.c:3326 ndisc_send_skb+0x2c1/0xd60 net/ipv6/ndisc.c:493 ndisc_send_na+0x8bf/0xb40 net/ipv6/ndisc.c:578 ndisc_recv_ns+0x8fe/0x1300 net/ipv6/ndisc.c:962 ndisc_rcv+0x41a/0x650 net/ipv6/ndisc.c:1864 icmpv6_rcv+0xee1/0x1790 net/ipv6/icmp.c:991 ip6_protocol_deliver_rcu+0xbc5/0x12f0 net/ipv6/ip6_input.c:436 ip6_input_finish net/ipv6/ip6_input.c:481 [inline] NF_HOOK include/linux/netfilter.h:317 [inline] ip6_input+0x1cd/0x3a0 net/ipv6/ip6_input.c:490 ip6_mc_input+0x35a/0x6c0 net/ipv6/ip6_input.c:584 dst_input include/net/dst.h:469 [inline] ip6_rcv_finish+0x360/0x3e0 net/ipv6/ip6_input.c:79 NF_HOOK include/linux/netfilter.h:317 [inline] ipv6_rcv+0xf1/0x240 net/ipv6/ip6_input.c:309 __netif_receive_skb_one_core net/core/dev.c:5763 [inline] __netif_receive_skb net/core/dev.c:5876 [inline] process_backlog+0x44b/0xad0 net/core/dev.c:6212 __napi_poll+0xd0/0x610 net/core/dev.c:6863 napi_poll net/core/dev.c:6932 [inline] net_rx_action+0x5ea/0xd80 net/core/dev.c:7054 handle_softirqs+0x1aa/0x630 kernel/softirq.c:621 __do_softirq kernel/softirq.c:659 [inline] invoke_softirq kernel/softirq.c:476 [inline] __irq_exit_rcu+0x47/0xb0 kernel/softirq.c:708 irq_exit_rcu+0xd/0x30 kernel/softirq.c:720 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x82/0x90 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:702 RIP: 0010:update_stack_state+0x3a4/0x4b0 arch/x86/kernel/unwind_frame.c:252 Code: 89 f7 e8 df a9 9a 00 49 c7 06 00 00 00 00 48 83 45 d0 08 eb 0c 48 83 e8 80 48 89 45 d0 4c 8b 6d c0 48 8b 45 90 42 80 3c 20 00 <74> 08 4c 89 ef e8 92 a8 9a 00 65 48 8b 05 1a 1d c0 7e 49 39 45 00 RSP: 0018:ffffc9000120ed38 EFLAGS: 00000246 RAX: 1ffff92000241dd6 RBX: ffffc9000120ee88 RCX: ffffc9000120ef01 RDX: ffffc9000120efb0 RSI: 1ffff92000241dd2 RDI: ffffc9000120eee0 RBP: ffffc9000120edf8 R08: ffffc9000120ef50 R09: ffffc9000120ef48 R10: 0000000000000000 R11: ffffffff8175cbd0 R12: dffffc0000000000 R13: ffffc9000120eeb0 R14: ffffc9000120eee0 R15: 1ffff92000241dd9 unwind_next_frame+0x3c1/0x750 arch/x86/kernel/unwind_frame.c:315 arch_stack_walk+0x138/0x170 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122 save_stack+0x125/0x240 mm/page_owner.c:174 __reset_page_owner+0x79/0x450 mm/page_owner.c:315 reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1352 [inline] free_unref_folios+0xd31/0x16a0 mm/page_alloc.c:2902 folios_put_refs+0x7d9/0x8f0 mm/swap.c:1061 free_pages_and_swap_cache+0x2fd/0x5e0 mm/swap_state.c:336 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:366 [inline] tlb_flush_mmu+0x79a/0xac0 mm/mmu_gather.c:373 zap_pte_range mm/memory.c:1725 [inline] zap_pmd_range mm/memory.c:1764 [inline] zap_pud_range mm/memory.c:1793 [inline] zap_p4d_range mm/memory.c:1814 [inline] unmap_page_range+0x37ec/0x3fa0 mm/memory.c:1835 unmap_single_vma mm/memory.c:1881 [inline] unmap_vmas+0x2d2/0x3f0 mm/memory.c:1925 exit_mmap+0x29c/0xbc0 mm/mmap.c:1962 __mmput+0x93/0x320 kernel/fork.c:1353 mmput+0x55/0x170 kernel/fork.c:1376 exit_mm kernel/exit.c:574 [inline] do_exit+0x93f/0x2650 kernel/exit.c:940 do_group_exit+0x229/0x2f0 kernel/exit.c:1095 __do_sys_exit_group kernel/exit.c:1106 [inline] __se_sys_exit_group kernel/exit.c:1104 [inline] __x64_sys_exit_group+0x43/0x50 kernel/exit.c:1104 x64_sys_call+0x2ed2/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:47 [inline] do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7f070f59c629 Code: Unable to access opcode bytes at 0x7f070f59c5ff. RSP: 002b:00007ffe0ad87658 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f070f64d673 RCX: 00007f070f59c629 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000043 RBP: 00007f070f64d691 R08: 0000000000000000 R09: 00007ffe0ad8777c R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000009 R13: 00007ffe0ad8777c R14: 00007ffe0ad87810 R15: 0000000000000000 net_ratelimit: 104159 callbacks suppressed bridge0: received packet on ªªªªª» with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:ea:cb:5e:6a:55:1d, vlan:0) bridge0: received packet on ªªªªª» with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0) bridge0: received packet on ªªªªª» with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:ea:cb:5e:6a:55:1d, vlan:0) bridge0: received packet on ªªªªª» with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on ªªªªª» with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) net_ratelimit: 115823 callbacks suppressed bridge0: received packet on ªªªªª» with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on ªªªªª» with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:ea:cb:5e:6a:55:1d, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on ªªªªª» with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on ªªªªª» with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth1_to_bridge with own address as source address (addr:ea:cb:5e:6a:55:1d, vlan:0)