================================================================== BUG: KASAN: slab-out-of-bounds in __list_del_entry_valid_or_report+0x92/0x190 lib/list_debug.c:62 Read of size 8 at addr ffff8880317eb780 by task syz.3.3890/20784 CPU: 1 UID: 0 PID: 20784 Comm: syz.3.3890 Tainted: G L syzkaller #0 PREEMPT_{RT,(full)} Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 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 __list_del_entry_valid_or_report+0x92/0x190 lib/list_debug.c:62 __list_del_entry_valid include/linux/list.h:132 [inline] __list_del_entry include/linux/list.h:223 [inline] list_del_init include/linux/list.h:295 [inline] bt_accept_unlink+0x39/0x260 net/bluetooth/af_bluetooth.c:259 l2cap_sock_teardown_cb+0x17e/0x490 net/bluetooth/l2cap_sock.c:1643 l2cap_chan_del+0xb5/0x610 net/bluetooth/l2cap_core.c:656 l2cap_conn_del+0x33d/0x570 net/bluetooth/l2cap_core.c:1802 hci_disconn_cfm include/net/bluetooth/hci_core.h:2154 [inline] hci_conn_hash_flush+0x10d/0x260 net/bluetooth/hci_conn.c:2734 hci_dev_close_sync+0x821/0x10e0 net/bluetooth/hci_sync.c:5368 hci_dev_do_close net/bluetooth/hci_core.c:502 [inline] hci_unregister_dev+0x21a/0x5a0 net/bluetooth/hci_core.c:2716 vhci_release+0x155/0x1b0 drivers/bluetooth/hci_vhci.c:690 __fput+0x461/0xa70 fs/file_table.c:510 task_work_run+0x1d9/0x270 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x70f/0x22c0 kernel/exit.c:975 do_group_exit+0x21b/0x2d0 kernel/exit.c:1117 get_signal+0x1284/0x1330 kernel/signal.c:3037 arch_do_signal_or_restart+0xbc/0x840 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x86/0x4d0 kernel/entry/common.c:98 Allocated by task 5278: 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:5308 [inline] __kvmalloc_node_noprof+0x3c2/0x8e0 mm/slub.c:6873 kvmalloc_array_node_noprof include/linux/slab.h:1216 [inline] __ptr_ring_init_queue_alloc_noprof include/linux/ptr_ring.h:481 [inline] ptr_ring_init_noprof include/linux/ptr_ring.h:499 [inline] skb_array_init_noprof include/linux/skb_array.h:182 [inline] pfifo_fast_init+0x112/0x6f0 net/sched/sch_generic.c:895 qdisc_create_dflt+0x13b/0x4e0 net/sched/sch_generic.c:1038 attach_one_default_qdisc net/sched/sch_generic.c:1197 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2711 [inline] attach_default_qdiscs net/sched/sch_generic.c:1215 [inline] dev_activate+0x378/0x1150 net/sched/sch_generic.c:1274 __dev_open+0x67a/0x830 net/core/dev.c:1711 __dev_change_flags+0x2fa/0x7e0 net/core/dev.c:9756 netif_change_flags+0x88/0x1a0 net/core/dev.c:9819 dev_change_flags+0x130/0x270 net/core/dev_api.c:68 devinet_ioctl+0x9f2/0x1b30 net/ipv4/devinet.c:1199 inet_ioctl+0x42a/0x560 net/ipv4/af_inet.c:1011 sock_do_ioctl+0x101/0x320 net/socket.c:1328 sock_ioctl+0x5c9/0x7f0 net/socket.c:1449 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xff/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880317e8000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 6208 bytes to the right of allocated 8000-byte region [ffff8880317e8000, ffff8880317e9f40) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x317e8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x80000000000040(head|node=0|zone=1) page_type: f5(slab) raw: 0080000000000040 ffff88813fe17280 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800020002 00000000f5000000 0000000000000000 head: 0080000000000040 ffff88813fe17280 dead000000000100 dead000000000122 head: 0000000000000000 0000000800020002 00000000f5000000 0000000000000000 head: 0080000000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff head: 0000000000000000 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 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 17142, tgid 17142 (syz-executor), ts 847366907379, free_ts 821567727040 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1861 prep_new_page mm/page_alloc.c:1869 [inline] get_page_from_freelist+0x27d6/0x2850 mm/page_alloc.c:3949 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5292 alloc_slab_page mm/slub.c:3289 [inline] allocate_slab+0x74/0x5e0 mm/slub.c:3404 new_slab mm/slub.c:3447 [inline] refill_objects+0x33c/0x3d0 mm/slub.c:7319 refill_sheaf mm/slub.c:2827 [inline] __pcs_replace_empty_main+0x373/0x720 mm/slub.c:4664 alloc_from_pcs mm/slub.c:4762 [inline] slab_alloc_node mm/slub.c:4896 [inline] __do_kmalloc_node mm/slub.c:5307 [inline] __kmalloc_noprof+0x530/0x7b0 mm/slub.c:5320 kmalloc_noprof include/linux/slab.h:954 [inline] batadv_hash_new+0x7b/0x2c0 net/batman-adv/hash.c:52 batadv_tt_global_init net/batman-adv/translation-table.c:1366 [inline] batadv_tt_init+0xbc/0x2a0 net/batman-adv/translation-table.c:4116 batadv_mesh_init+0x416/0x710 net/batman-adv/main.c:194 batadv_meshif_init_late+0xa38/0xee0 net/batman-adv/mesh-interface.c:811 register_netdevice+0x6e4/0x1f10 net/core/dev.c:11340 rtnl_newlink_create+0x329/0xb70 net/core/rtnetlink.c:3864 __rtnl_newlink net/core/rtnetlink.c:3995 [inline] rtnl_newlink+0x166a/0x1bb0 net/core/rtnetlink.c:4110 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6996 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551 page last free pid 16934 tgid 16934 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1405 [inline] __free_frozen_pages+0x1075/0x11b0 mm/page_alloc.c:2946 __slab_free+0x252/0x2a0 mm/slub.c:5653 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4582 [inline] slab_alloc_node mm/slub.c:4911 [inline] kmem_cache_alloc_noprof+0x33b/0x680 mm/slub.c:4918 ptlock_alloc+0x20/0x70 mm/memory.c:7582 ptlock_init include/linux/mm.h:3731 [inline] pagetable_pte_ctor include/linux/mm.h:3780 [inline] __pte_alloc_one_noprof include/asm-generic/pgalloc.h:79 [inline] pte_alloc_one+0x7e/0x380 arch/x86/mm/pgtable.c:18 __do_fault+0xd1/0x2a0 mm/memory.c:5471 do_shared_fault mm/memory.c:5975 [inline] do_fault mm/memory.c:6049 [inline] do_pte_missing+0x65b/0x2940 mm/memory.c:4566 handle_pte_fault mm/memory.c:6430 [inline] __handle_mm_fault mm/memory.c:6568 [inline] handle_mm_fault+0xdb5/0x14c0 mm/memory.c:6737 do_user_addr_fault+0xa73/0x1340 arch/x86/mm/fault.c:1334 handle_page_fault arch/x86/mm/fault.c:1474 [inline] exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 Memory state around the buggy address: ffff8880317eb680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880317eb700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880317eb780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880317eb800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880317eb880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================