Bluetooth: hci4: Opcode 0x0c1a failed: -4 Bluetooth: hci4: Opcode 0x0406 failed: -4 Bluetooth: hci3: Opcode 0x0c1a failed: -4 Bluetooth: hci3: Opcode 0x0406 failed: -4 Bluetooth: hci3: Opcode 0x0406 failed: -4 ================================================================== BUG: KASAN: slab-use-after-free in __list_del_entry_valid_or_report+0x92/0x190 lib/list_debug.c:62 Read of size 8 at addr ffff88805df85558 by task syz.0.3338/17644 CPU: 0 UID: 0 PID: 17644 Comm: syz.0.3338 Not tainted 6.16.0-syzkaller-06699-ge8d780dcd957 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 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:124 [inline] __list_del_entry include/linux/list.h:215 [inline] list_del_init include/linux/list.h:287 [inline] bt_accept_unlink+0x39/0x240 net/bluetooth/af_bluetooth.c:259 l2cap_sock_teardown_cb+0x17e/0x460 net/bluetooth/l2cap_sock.c:1613 l2cap_chan_del+0xb5/0x5e0 net/bluetooth/l2cap_core.c:655 l2cap_conn_del+0x388/0x680 net/bluetooth/l2cap_core.c:1787 l2cap_connect_cfm+0x11d/0x1040 net/bluetooth/l2cap_core.c:7259 hci_connect_cfm include/net/bluetooth/hci_core.h:2050 [inline] hci_conn_failed+0x1ce/0x310 net/bluetooth/hci_conn.c:1278 hci_abort_conn_sync+0x658/0xe30 net/bluetooth/hci_sync.c:5689 hci_disconnect_all_sync+0x1b5/0x350 net/bluetooth/hci_sync.c:5712 hci_suspend_sync+0x3b8/0xbf0 net/bluetooth/hci_sync.c:6188 hci_suspend_dev+0x28d/0x4d0 net/bluetooth/hci_core.c:2849 hci_suspend_notifier+0xf2/0x290 net/bluetooth/hci_core.c:2420 notifier_call_chain+0x1b6/0x3e0 kernel/notifier.c:85 notifier_call_chain_robust kernel/notifier.c:120 [inline] blocking_notifier_call_chain_robust+0x85/0x100 kernel/notifier.c:345 pm_notifier_call_chain_robust+0x2c/0x60 kernel/power/main.c:103 snapshot_open+0x19c/0x280 kernel/power/user.c:77 misc_open+0x2bc/0x330 drivers/char/misc.c:161 chrdev_open+0x4cc/0x5e0 fs/char_dev.c:414 do_dentry_open+0xdf3/0x1970 fs/open.c:965 vfs_open+0x3b/0x340 fs/open.c:1095 do_open fs/namei.c:3887 [inline] path_openat+0x2ee5/0x3830 fs/namei.c:4046 do_filp_open+0x1fa/0x410 fs/namei.c:4073 do_sys_openat2+0x121/0x1c0 fs/open.c:1435 do_sys_open fs/open.c:1450 [inline] __do_sys_openat fs/open.c:1466 [inline] __se_sys_openat fs/open.c:1461 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1461 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: 0033:0x7f4ea798e9a9 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:00007f4ea8795038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f4ea7bb5fa0 RCX: 00007f4ea798e9a9 RDX: 0000000000040000 RSI: 0000200000000680 RDI: ffffffffffffff9c RBP: 00007f4ea7a10d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000019 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f4ea7bb5fa0 R15: 00007fff92583838 Allocated by task 49: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4364 [inline] __kmalloc_node_track_caller_noprof+0x271/0x4e0 mm/slub.c:4383 kmalloc_reserve+0x136/0x290 net/core/skbuff.c:600 pskb_expand_head+0x18e/0x1150 net/core/skbuff.c:2240 __skb_cow include/linux/skbuff.h:3783 [inline] skb_cow_head include/linux/skbuff.h:3817 [inline] gre_tap_xmit+0x4d5/0x7a0 net/ipv4/ip_gre.c:773 __netdev_start_xmit include/linux/netdevice.h:5219 [inline] netdev_start_xmit include/linux/netdevice.h:5228 [inline] xmit_one net/core/dev.c:3827 [inline] dev_hard_start_xmit+0x2d7/0x830 net/core/dev.c:3843 sch_direct_xmit+0x241/0x4b0 net/sched/sch_generic.c:344 __dev_xmit_skb net/core/dev.c:4102 [inline] __dev_queue_xmit+0x1857/0x3b50 net/core/dev.c:4679 dev_queue_xmit_accel include/linux/netdevice.h:3364 [inline] macvlan_queue_xmit drivers/net/macvlan.c:557 [inline] macvlan_start_xmit+0x46d/0x6e0 drivers/net/macvlan.c:581 __netdev_start_xmit include/linux/netdevice.h:5219 [inline] netdev_start_xmit include/linux/netdevice.h:5228 [inline] xmit_one net/core/dev.c:3827 [inline] dev_hard_start_xmit+0x2d7/0x830 net/core/dev.c:3843 __dev_queue_xmit+0x1b8d/0x3b50 net/core/dev.c:4713 dev_queue_xmit include/linux/netdevice.h:3358 [inline] batadv_send_skb_packet+0x44f/0x6d0 net/batman-adv/send.c:107 batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:392 [inline] batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:420 [inline] batadv_iv_send_outstanding_bat_ogm_packet+0x62f/0x7e0 net/batman-adv/bat_iv_ogm.c:1702 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x711/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Freed by task 49: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2416 [inline] slab_free mm/slub.c:4679 [inline] kfree+0x18e/0x440 mm/slub.c:4878 skb_release_data+0x62d/0x7c0 net/core/skbuff.c:1086 skb_release_all net/core/skbuff.c:1151 [inline] __kfree_skb net/core/skbuff.c:1165 [inline] sk_skb_reason_drop+0x127/0x170 net/core/skbuff.c:1203 kfree_skb_reason include/linux/skbuff.h:1275 [inline] kfree_skb include/linux/skbuff.h:1284 [inline] ip_tunnel_xmit+0xe76/0x2390 net/ipv4/ip_tunnel.c:-1 __gre_xmit net/ipv4/ip_gre.c:488 [inline] gre_tap_xmit+0x590/0x7a0 net/ipv4/ip_gre.c:776 __netdev_start_xmit include/linux/netdevice.h:5219 [inline] netdev_start_xmit include/linux/netdevice.h:5228 [inline] xmit_one net/core/dev.c:3827 [inline] dev_hard_start_xmit+0x2d7/0x830 net/core/dev.c:3843 sch_direct_xmit+0x241/0x4b0 net/sched/sch_generic.c:344 __dev_xmit_skb net/core/dev.c:4102 [inline] __dev_queue_xmit+0x1857/0x3b50 net/core/dev.c:4679 dev_queue_xmit_accel include/linux/netdevice.h:3364 [inline] macvlan_queue_xmit drivers/net/macvlan.c:557 [inline] macvlan_start_xmit+0x46d/0x6e0 drivers/net/macvlan.c:581 __netdev_start_xmit include/linux/netdevice.h:5219 [inline] netdev_start_xmit include/linux/netdevice.h:5228 [inline] xmit_one net/core/dev.c:3827 [inline] dev_hard_start_xmit+0x2d7/0x830 net/core/dev.c:3843 __dev_queue_xmit+0x1b8d/0x3b50 net/core/dev.c:4713 dev_queue_xmit include/linux/netdevice.h:3358 [inline] batadv_send_skb_packet+0x44f/0x6d0 net/batman-adv/send.c:107 batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:392 [inline] batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:420 [inline] batadv_iv_send_outstanding_bat_ogm_packet+0x62f/0x7e0 net/batman-adv/bat_iv_ogm.c:1702 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x711/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff88805df85000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1368 bytes inside of freed 2048-byte region [ffff88805df85000, ffff88805df85800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5df80 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801a442000 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801a442000 0000000000000000 dead000000000001 head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea000177e001 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 6294, tgid 6294 (kworker/u8:12), ts 741637086638, free_ts 741623963393 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419 alloc_slab_page mm/slub.c:2486 [inline] allocate_slab+0x8a/0x370 mm/slub.c:2654 new_slab mm/slub.c:2708 [inline] ___slab_alloc+0xbeb/0x1410 mm/slub.c:3890 __slab_alloc mm/slub.c:3980 [inline] __slab_alloc_node mm/slub.c:4055 [inline] slab_alloc_node mm/slub.c:4216 [inline] __do_kmalloc_node mm/slub.c:4363 [inline] __kmalloc_node_track_caller_noprof+0x2f8/0x4e0 mm/slub.c:4383 kmalloc_reserve+0x136/0x290 net/core/skbuff.c:600 __alloc_skb+0x142/0x2d0 net/core/skbuff.c:669 alloc_skb include/linux/skbuff.h:1336 [inline] mld_newpack+0x13c/0xc40 net/ipv6/mcast.c:1780 add_grhead+0x5a/0x2a0 net/ipv6/mcast.c:1891 add_grec+0x1452/0x1740 net/ipv6/mcast.c:2030 mld_send_initial_cr+0x288/0x550 net/ipv6/mcast.c:2273 ipv6_mc_dad_complete+0x88/0x410 net/ipv6/mcast.c:2284 addrconf_dad_completed+0x6d5/0xd60 net/ipv6/addrconf.c:4340 addrconf_dad_work+0xc36/0x14b0 net/ipv6/addrconf.c:-1 page last free pid 12745 tgid 12745 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1248 [inline] __free_frozen_pages+0xc71/0xe70 mm/page_alloc.c:2706 discard_slab mm/slub.c:2752 [inline] __put_partials+0x156/0x1a0 mm/slub.c:3217 put_cpu_partial+0x17c/0x250 mm/slub.c:3292 __slab_free+0x2d5/0x3c0 mm/slub.c:4549 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4179 [inline] slab_alloc_node mm/slub.c:4228 [inline] kmem_cache_alloc_node_noprof+0x1bb/0x3c0 mm/slub.c:4280 __alloc_skb+0x112/0x2d0 net/core/skbuff.c:659 alloc_skb include/linux/skbuff.h:1336 [inline] nlmsg_new include/net/netlink.h:1055 [inline] netlink_ack+0x146/0xa50 net/netlink/af_netlink.c:2489 netlink_rcv_skb+0x28c/0x470 net/netlink/af_netlink.c:2558 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:729 __sys_sendto+0x3bd/0x520 net/socket.c:2228 __do_sys_sendto net/socket.c:2235 [inline] __se_sys_sendto net/socket.c:2231 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2231 Memory state around the buggy address: ffff88805df85400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805df85480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805df85500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805df85580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805df85600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================