Bluetooth: hci2: Opcode 0x0c1a failed: -4 Bluetooth: hci2: Error when powering off device on rfkill (-4) Bluetooth: hci4: Opcode 0x0c1a failed: -4 Bluetooth: hci4: Error when powering off device on rfkill (-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 ffff88807a4ad578 by task syz.7.1047/10546 CPU: 0 UID: 0 PID: 10546 Comm: syz.7.1047 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xba/0x230 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:1640 l2cap_chan_del+0xb5/0x610 net/bluetooth/l2cap_core.c:656 l2cap_conn_del+0x333/0x5c0 net/bluetooth/l2cap_core.c:1782 hci_disconn_cfm include/net/bluetooth/hci_core.h:2154 [inline] hci_conn_hash_flush+0x10d/0x260 net/bluetooth/hci_conn.c:2644 hci_dev_close_sync+0x821/0x10e0 net/bluetooth/hci_sync.c:5358 hci_dev_do_close+0x30/0xc0 net/bluetooth/hci_core.c:502 hci_rfkill_set_block+0x1f4/0x290 net/bluetooth/hci_core.c:930 rfkill_set_block+0x1d2/0x440 net/rfkill/core.c:346 rfkill_fop_write+0x461/0x5a0 net/rfkill/core.c:1301 vfs_write+0x29a/0xb90 fs/read_write.c:686 ksys_write+0x150/0x270 fs/read_write.c:740 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7852f9c799 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:00007f7853e18028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f7853215fa0 RCX: 00007f7852f9c799 RDX: 0000000000000008 RSI: 0000200000000080 RDI: 0000000000000003 RBP: 00007f7853032bd9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7853216038 R14: 00007f7853215fa0 R15: 00007ffef909e0b8 Allocated by task 9418: 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:5262 [inline] __kmalloc_node_track_caller_noprof+0x4db/0x7b0 mm/slub.c:5370 kmalloc_reserve net/core/skbuff.c:635 [inline] pskb_expand_head+0x228/0x1320 net/core/skbuff.c:2304 netlink_trim+0x1b3/0x2c0 net/netlink/af_netlink.c:1299 netlink_broadcast_filtered+0xd6/0x1020 net/netlink/af_netlink.c:1512 nlmsg_multicast_filtered include/net/netlink.h:1165 [inline] nlmsg_multicast include/net/netlink.h:1184 [inline] nlmsg_notify+0xf0/0x1a0 net/netlink/af_netlink.c:2593 rtnl_notify net/core/rtnetlink.c:958 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:4436 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:4452 [inline] rtnetlink_event+0x224/0x270 net/core/rtnetlink.c:7018 notifier_call_chain+0x1be/0x400 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2288 [inline] call_netdevice_notifiers net/core/dev.c:2302 [inline] netif_set_mac_address+0x39f/0x4e0 net/core/dev.c:10004 do_setlink+0x9b1/0x4590 net/core/rtnetlink.c:3110 rtnl_changelink net/core/rtnetlink.c:3776 [inline] __rtnl_newlink net/core/rtnetlink.c:3935 [inline] rtnl_newlink+0x15a9/0x1be0 net/core/rtnetlink.c:4072 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6958 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec+0x18f/0x1d0 net/socket.c:802 __sock_sendmsg net/socket.c:817 [inline] __sys_sendto+0x3ff/0x590 net/socket.c:2286 __do_sys_sendto net/socket.c:2293 [inline] __se_sys_sendto net/socket.c:2289 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2289 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 9418: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 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:2692 [inline] slab_free mm/slub.c:6167 [inline] kfree+0x1c1/0x630 mm/slub.c:6485 skb_kfree_head net/core/skbuff.c:1078 [inline] skb_free_head net/core/skbuff.c:1090 [inline] skb_release_data+0x6f0/0x940 net/core/skbuff.c:1117 skb_release_all net/core/skbuff.c:1192 [inline] __kfree_skb+0x5d/0x210 net/core/skbuff.c:1206 netlink_broadcast_filtered+0xee4/0x1020 net/netlink/af_netlink.c:1535 nlmsg_multicast_filtered include/net/netlink.h:1165 [inline] nlmsg_multicast include/net/netlink.h:1184 [inline] nlmsg_notify+0xf0/0x1a0 net/netlink/af_netlink.c:2593 rtnl_notify net/core/rtnetlink.c:958 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:4436 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:4452 [inline] rtnetlink_event+0x224/0x270 net/core/rtnetlink.c:7018 notifier_call_chain+0x1be/0x400 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2288 [inline] call_netdevice_notifiers net/core/dev.c:2302 [inline] netif_set_mac_address+0x39f/0x4e0 net/core/dev.c:10004 do_setlink+0x9b1/0x4590 net/core/rtnetlink.c:3110 rtnl_changelink net/core/rtnetlink.c:3776 [inline] __rtnl_newlink net/core/rtnetlink.c:3935 [inline] rtnl_newlink+0x15a9/0x1be0 net/core/rtnetlink.c:4072 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6958 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec+0x18f/0x1d0 net/socket.c:802 __sock_sendmsg net/socket.c:817 [inline] __sys_sendto+0x3ff/0x590 net/socket.c:2286 __do_sys_sendto net/socket.c:2293 [inline] __se_sys_sendto net/socket.c:2289 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2289 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88807a4ad000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1400 bytes inside of freed 2048-byte region [ffff88807a4ad000, ffff88807a4ad800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88807a4ab000 pfn:0x7a4a8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88801b034000 ffffea000089ec10 ffffea00008dae10 raw: ffff88807a4ab000 0000000800080003 00000000f5000000 0000000000000000 head: 00fff00000000240 ffff88801b034000 ffffea000089ec10 ffffea00008dae10 head: ffff88807a4ab000 0000000800080003 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea0001e92a01 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 5828, tgid 5828 (syz-executor), ts 92045632650, free_ts 91809835261 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x231/0x280 mm/page_alloc.c:1892 prep_new_page mm/page_alloc.c:1900 [inline] get_page_from_freelist+0x23a1/0x2440 mm/page_alloc.c:3965 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5253 alloc_slab_page mm/slub.c:3296 [inline] allocate_slab+0x77/0x660 mm/slub.c:3485 new_slab mm/slub.c:3543 [inline] refill_objects+0x331/0x3c0 mm/slub.c:7177 refill_sheaf mm/slub.c:2818 [inline] __pcs_replace_empty_main+0x2cd/0x650 mm/slub.c:4618 alloc_from_pcs mm/slub.c:4719 [inline] slab_alloc_node mm/slub.c:4853 [inline] __do_kmalloc_node mm/slub.c:5261 [inline] __kmalloc_node_noprof+0x577/0x7c0 mm/slub.c:5268 kmalloc_node_noprof include/linux/slab.h:1081 [inline] qdisc_alloc+0x92/0x9f0 net/sched/sch_generic.c:976 qdisc_create_dflt+0x8e/0x510 net/sched/sch_generic.c:1031 attach_one_default_qdisc net/sched/sch_generic.c:1197 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2688 [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+0x1f7/0x690 net/core/dev.c:9763 netif_change_flags+0x88/0x1a0 net/core/dev.c:9826 do_setlink+0xf82/0x4590 net/core/rtnetlink.c:3158 rtnl_changelink net/core/rtnetlink.c:3776 [inline] __rtnl_newlink net/core/rtnetlink.c:3935 [inline] rtnl_newlink+0x15a9/0x1be0 net/core/rtnetlink.c:4072 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6958 page last free pid 3466 tgid 3466 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1436 [inline] __free_frozen_pages+0xbe2/0xd60 mm/page_alloc.c:2981 __slab_free+0x263/0x2b0 mm/slub.c:5575 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 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:4542 [inline] slab_alloc_node mm/slub.c:4868 [inline] kmem_cache_alloc_node_noprof+0x384/0x690 mm/slub.c:4920 __alloc_skb+0x1d0/0x7d0 net/core/skbuff.c:702 alloc_skb include/linux/skbuff.h:1383 [inline] nlmsg_new include/net/netlink.h:1055 [inline] rtmsg_ifinfo_build_skb+0x84/0x260 net/core/rtnetlink.c:4407 rtmsg_ifinfo_event net/core/rtnetlink.c:4449 [inline] rtmsg_ifinfo+0x8c/0x1a0 net/core/rtnetlink.c:4458 netif_state_change+0x297/0x3a0 net/core/dev.c:1605 __linkwatch_run_queue+0x572/0x850 net/core/link_watch.c:240 linkwatch_event+0x4c/0x60 net/core/link_watch.c:314 process_one_work+0x963/0x1720 kernel/workqueue.c:3285 process_scheduled_works kernel/workqueue.c:3376 [inline] worker_thread+0xb46/0x1140 kernel/workqueue.c:3457 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 Memory state around the buggy address: ffff88807a4ad400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807a4ad480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807a4ad500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807a4ad580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807a4ad600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================