================================================================== BUG: KASAN: slab-use-after-free in mini_qdisc_pair_swap+0x174/0x190 net/sched/sch_generic.c:1618 Write of size 8 at addr ffff888028e712c8 by task syz.4.1948/16721 CPU: 1 UID: 0 PID: 16721 Comm: syz.4.1948 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 mini_qdisc_pair_swap+0x174/0x190 net/sched/sch_generic.c:1618 tcf_chain_head_change_item net/sched/cls_api.c:537 [inline] tcf_chain0_head_change net/sched/cls_api.c:551 [inline] tcf_chain_tp_insert net/sched/cls_api.c:1922 [inline] tcf_chain_tp_insert_unique+0x76a/0x970 net/sched/cls_api.c:1971 tc_new_tfilter+0x13d1/0x1810 net/sched/cls_api.c:2405 rtnetlink_rcv_msg+0x802/0xc00 net/core/rtnetlink.c:7132 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7bd/0x940 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:800 __sock_sendmsg net/socket.c:815 [inline] ____sys_sendmsg+0x54e/0x850 net/socket.c:2713 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2767 __sys_sendmsg net/socket.c:2799 [inline] __do_sys_sendmsg net/socket.c:2804 [inline] __se_sys_sendmsg net/socket.c:2802 [inline] __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2802 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: 0033:0x7fb64fb9e159 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:00007fb650ad2028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fb64fe26180 RCX: 00007fb64fb9e159 RDX: 0000000000008000 RSI: 0000200000001300 RDI: 0000000000000005 RBP: 00007fb64fc35024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb64fe26218 R14: 00007fb64fe26180 R15: 00007ffdf32af808 Allocated by task 15603: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5334 [inline] __kmalloc_node_noprof+0x4cc/0x740 mm/slub.c:5346 _kmalloc_node_noprof include/linux/slab.h:1197 [inline] qdisc_alloc+0x92/0x9d0 net/sched/sch_generic.c:998 qdisc_create+0x12c/0xf00 net/sched/sch_api.c:1290 __tc_modify_qdisc net/sched/sch_api.c:1763 [inline] tc_modify_qdisc+0x18cc/0x2390 net/sched/sch_api.c:1844 rtnetlink_rcv_msg+0x7b9/0xc00 net/core/rtnetlink.c:7141 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7bd/0x940 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:800 __sock_sendmsg net/socket.c:815 [inline] ____sys_sendmsg+0x54e/0x850 net/socket.c:2713 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2767 __sys_sendmsg net/socket.c:2799 [inline] __do_sys_sendmsg net/socket.c:2804 [inline] __se_sys_sendmsg net/socket.c:2802 [inline] __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2802 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 Freed by task 8559: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2677 [inline] slab_free mm/slub.c:6377 [inline] kfree+0x1c5/0x640 mm/slub.c:6692 rcu_do_batch kernel/rcu/tree.c:2645 [inline] rcu_core+0x794/0x10b0 kernel/rcu/tree.c:2897 handle_softirqs+0x226/0x860 kernel/softirq.c:645 do_softirq+0x77/0xd0 kernel/softirq.c:546 __local_bh_enable_ip+0x100/0x140 kernel/softirq.c:473 local_bh_enable include/linux/bottom_half.h:33 [inline] update_defense_level+0x867/0xcb0 net/netfilter/ipvs/ip_vs_ctl.c:210 defense_work_handler+0x2d/0xd0 net/netfilter/ipvs/ip_vs_ctl.c:235 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0xa88/0x14c0 kernel/workqueue.c:3405 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486 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 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 __call_rcu_common kernel/rcu/tree.c:3159 [inline] call_rcu+0xee/0x8b0 kernel/rcu/tree.c:3279 qdisc_graft+0xcdd/0x1810 net/sched/sch_api.c:1168 __tc_modify_qdisc net/sched/sch_api.c:1788 [inline] tc_modify_qdisc+0x1968/0x2390 net/sched/sch_api.c:1844 rtnetlink_rcv_msg+0x7b9/0xc00 net/core/rtnetlink.c:7141 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7bd/0x940 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:800 __sock_sendmsg net/socket.c:815 [inline] ____sys_sendmsg+0x54e/0x850 net/socket.c:2713 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2767 __sys_sendmsg net/socket.c:2799 [inline] __do_sys_sendmsg net/socket.c:2804 [inline] __se_sys_sendmsg net/socket.c:2802 [inline] __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2802 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 The buggy address belongs to the object at ffff888028e71000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 712 bytes inside of freed 1024-byte region [ffff888028e71000, ffff888028e71400) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x28e70 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801b001dc0 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801b001dc0 dead000000000100 dead000000000122 head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000 head: 00fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 8097366020, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859 prep_new_page mm/page_alloc.c:1867 [inline] get_page_from_freelist+0x21fe/0x2270 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304 alloc_slab_page mm/slub.c:3266 [inline] allocate_slab+0x79/0x5e0 mm/slub.c:3380 new_slab mm/slub.c:3426 [inline] refill_objects+0x2d5/0x350 mm/slub.c:7310 refill_sheaf mm/slub.c:2804 [inline] __pcs_replace_empty_main+0x2c3/0x6b0 mm/slub.c:4675 alloc_from_pcs mm/slub.c:4773 [inline] slab_alloc_node mm/slub.c:4905 [inline] __kmalloc_cache_node_noprof+0x449/0x630 mm/slub.c:5504 _kmalloc_node_noprof include/linux/slab.h:1193 [inline] alloc_desc+0x63/0x750 kernel/irq/irqdesc.c:437 alloc_descs kernel/irq/irqdesc.c:528 [inline] __irq_alloc_descs+0x3f9/0x6b0 kernel/irq/irqdesc.c:922 irq_domain_alloc_descs kernel/irq/irqdomain.c:-1 [inline] irq_domain_alloc_irqs_locked+0x8f/0xd50 kernel/irq/irqdomain.c:1639 __irq_domain_alloc_irqs+0xa5/0x100 kernel/irq/irqdomain.c:1713 __msi_domain_alloc_irqs+0x7b2/0x13f0 kernel/irq/msi.c:1336 __msi_domain_alloc_locked kernel/irq/msi.c:1393 [inline] msi_domain_alloc_locked+0x491/0xb40 kernel/irq/msi.c:1398 msi_domain_alloc_irqs_all_locked+0xab/0xf0 kernel/irq/msi.c:1474 __msix_setup_interrupts drivers/pci/msi/msi.c:687 [inline] msix_setup_interrupts drivers/pci/msi/msi.c:708 [inline] msix_capability_init+0x75d/0xe90 drivers/pci/msi/msi.c:748 __pci_enable_msix_range+0x506/0x5f0 drivers/pci/msi/msi.c:856 page_owner free stack trace missing Memory state around the buggy address: ffff888028e71180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888028e71200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888028e71280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888028e71300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888028e71380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================