Bluetooth: hci1: Opcode 0x0c1a failed: -4 Bluetooth: hci0: Opcode 0x0c1a failed: -4 Bluetooth: hci2: Opcode 0x0c1a failed: -4 Bluetooth: hci2: Opcode 0x0406 failed: -4 ================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0x80/0x120 lib/list_debug.c:59 Read of size 8 at addr ffff88807497d518 by task syz.5.741/8218 CPU: 0 PID: 8218 Comm: syz.5.741 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 __list_del_entry_valid+0x80/0x120 lib/list_debug.c:59 __list_del_entry include/linux/list.h:134 [inline] list_del_init include/linux/list.h:206 [inline] bt_accept_unlink+0x35/0x230 net/bluetooth/af_bluetooth.c:232 l2cap_sock_teardown_cb+0x1af/0x380 net/bluetooth/l2cap_sock.c:1643 l2cap_chan_del+0xab/0x620 net/bluetooth/l2cap_core.c:680 l2cap_conn_del+0x3c4/0x6a0 net/bluetooth/l2cap_core.c:1955 l2cap_connect_cfm+0x119/0x1120 net/bluetooth/l2cap_core.c:8379 hci_connect_cfm include/net/bluetooth/hci_core.h:1817 [inline] hci_conn_failed+0x16f/0x2a0 net/bluetooth/hci_conn.c:1248 hci_abort_conn_sync+0xb3c/0xd50 net/bluetooth/hci_sync.c:5577 hci_disconnect_all_sync net/bluetooth/hci_sync.c:5590 [inline] hci_suspend_sync+0x48a/0xdb0 net/bluetooth/hci_sync.c:6072 hci_suspend_dev+0x199/0x320 net/bluetooth/hci_core.c:2857 hci_suspend_notifier+0xc8/0x270 net/bluetooth/hci_core.c:2424 notifier_call_chain kernel/notifier.c:87 [inline] notifier_call_chain_robust+0xe1/0x2c0 kernel/notifier.c:122 blocking_notifier_call_chain_robust+0x66/0x90 kernel/notifier.c:347 pm_notifier_call_chain_robust+0x28/0x60 kernel/power/main.c:90 snapshot_open+0x19b/0x280 kernel/power/user.c:77 misc_open+0x31f/0x390 drivers/char/misc.c:145 chrdev_open+0x5c5/0x6a0 fs/char_dev.c:414 do_dentry_open+0x7e9/0x10d0 fs/open.c:882 do_open fs/namei.c:3634 [inline] path_openat+0x2635/0x2ee0 fs/namei.c:3791 do_filp_open+0x1f1/0x430 fs/namei.c:3818 do_sys_openat2+0x150/0x4b0 fs/open.c:1320 do_sys_open fs/open.c:1336 [inline] __do_sys_openat fs/open.c:1352 [inline] __se_sys_openat fs/open.c:1347 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1347 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f3f8999c819 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:00007f3f877f4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f3f89c16270 RCX: 00007f3f8999c819 RDX: 0000000000084400 RSI: 00002000000000c0 RDI: ffffffffffffff9c RBP: 00007f3f89a32c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3f89c16308 R14: 00007f3f89c16270 R15: 00007fff5b591ae8 Allocated by task 8100: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc+0xb0/0x240 mm/slab_common.c:949 kmalloc include/linux/slab.h:568 [inline] sk_prot_alloc+0xe7/0x210 net/core/sock.c:2052 sk_alloc+0x36/0x340 net/core/sock.c:2108 bt_sock_alloc+0x36/0x130 net/bluetooth/af_bluetooth.c:148 l2cap_sock_alloc net/bluetooth/l2cap_sock.c:1924 [inline] l2cap_sock_create+0x12b/0x2f0 net/bluetooth/l2cap_sock.c:1966 bt_sock_create+0x155/0x220 net/bluetooth/af_bluetooth.c:132 __sock_create+0x4a2/0x940 net/socket.c:1549 sock_create net/socket.c:1605 [inline] __sys_socket_create net/socket.c:1642 [inline] __sys_socket+0xc4/0x190 net/socket.c:1670 __do_sys_socket net/socket.c:1683 [inline] __se_sys_socket net/socket.c:1681 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1681 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 8100: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x2d/0x50 mm/kasan/generic.c:516 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:237 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1729 [inline] slab_free_freelist_hook+0x131/0x1a0 mm/slub.c:1755 slab_free mm/slub.c:3687 [inline] __kmem_cache_free+0xb6/0x1f0 mm/slub.c:3700 sk_prot_free net/core/sock.c:2091 [inline] __sk_destruct+0x4ba/0x650 net/core/sock.c:2177 l2cap_sock_release+0x169/0x1e0 net/bluetooth/l2cap_sock.c:1465 __sock_release net/socket.c:654 [inline] sock_close+0xd5/0x240 net/socket.c:1399 __fput+0x22c/0x920 fs/file_table.c:320 task_work_run+0x1d0/0x260 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486 call_rcu+0x14f/0x990 kernel/rcu/tree.c:2849 netlink_release+0x158e/0x19e0 net/netlink/af_netlink.c:799 __sock_release net/socket.c:654 [inline] sock_close+0xd5/0x240 net/socket.c:1399 __fput+0x22c/0x920 fs/file_table.c:320 task_work_run+0x1d0/0x260 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Second to last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486 call_rcu+0x14f/0x990 kernel/rcu/tree.c:2849 netdev_for_each_tx_queue include/linux/netdevice.h:2465 [inline] dev_shutdown+0x92/0x440 net/sched/sch_generic.c:1465 unregister_netdevice_many+0xa4f/0x1930 net/core/dev.c:11007 unregister_netdevice_queue+0x324/0x370 net/core/dev.c:10947 unregister_netdevice include/linux/netdevice.h:3075 [inline] __tun_detach+0xd4a/0x1500 drivers/net/tun.c:685 tun_detach drivers/net/tun.c:701 [inline] tun_chr_close+0x109/0x1b0 drivers/net/tun.c:3492 __fput+0x22c/0x920 fs/file_table.c:320 task_work_run+0x1d0/0x260 kernel/task_work.c:203 get_signal+0x11a6/0x1350 kernel/signal.c:2648 arch_do_signal_or_restart+0xc4/0x1350 arch/x86/kernel/signal.c:871 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff88807497d000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1304 bytes inside of 2048-byte region [ffff88807497d000, ffff88807497d800) The buggy address belongs to the physical page: page:ffffea0001d25e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x74978 head:ffffea0001d25e00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888017442000 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4275, tgid 4275 (syz-executor), ts 76010218148, free_ts 76001239974 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2559 prep_new_page mm/page_alloc.c:2566 [inline] get_page_from_freelist+0x1a1e/0x1ab0 mm/page_alloc.c:4357 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5657 alloc_slab_page+0x5d/0x160 mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x87/0x2c0 mm/slub.c:1997 ___slab_alloc+0xbc6/0x1240 mm/slub.c:3154 __slab_alloc mm/slub.c:3240 [inline] slab_alloc_node mm/slub.c:3325 [inline] __kmem_cache_alloc_node+0x1a0/0x260 mm/slub.c:3398 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc_node_track_caller+0x9e/0x230 mm/slab_common.c:956 kmalloc_reserve net/core/skbuff.c:446 [inline] pskb_expand_head+0x1a6/0x12a0 net/core/skbuff.c:1848 netlink_trim+0x180/0x220 net/netlink/af_netlink.c:1299 netlink_broadcast+0x75/0x10d0 net/netlink/af_netlink.c:1500 nlmsg_multicast include/net/netlink.h:1071 [inline] nlmsg_notify+0xe7/0x1a0 net/netlink/af_netlink.c:2554 register_netdevice+0x1742/0x1b00 net/core/dev.c:10277 __ip_tunnel_create+0x346/0x450 net/ipv4/ip_tunnel.c:267 ip_tunnel_init_net+0x2ac/0x780 net/ipv4/ip_tunnel.c:1104 ops_init+0x355/0x5f0 net/core/net_namespace.c:138 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1486 [inline] free_pcp_prepare mm/page_alloc.c:1536 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3413 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3508 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:306 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x4b/0x480 mm/slab.h:737 slab_alloc_node mm/slub.c:3359 [inline] __kmem_cache_alloc_node+0x140/0x260 mm/slub.c:3398 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc_node_track_caller+0x9e/0x230 mm/slab_common.c:956 kmemdup+0x27/0x60 mm/util.c:129 kmemdup include/linux/fortify-string.h:585 [inline] __addrconf_sysctl_register+0xa2/0x3e0 net/ipv6/addrconf.c:7132 addrconf_sysctl_register+0x15c/0x1b0 net/ipv6/addrconf.c:7197 ipv6_add_dev+0xbe0/0x1120 net/ipv6/addrconf.c:451 addrconf_notify+0x634/0xf40 net/ipv6/addrconf.c:3595 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:455 call_netdevice_notifiers_extack net/core/dev.c:2052 [inline] call_netdevice_notifiers net/core/dev.c:2066 [inline] register_netdevice+0x163f/0x1b00 net/core/dev.c:10263 register_netdev+0x37/0x50 net/core/dev.c:10358 Memory state around the buggy address: ffff88807497d400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807497d480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807497d500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807497d580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807497d600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================