Bluetooth: hci1: Opcode 0x0c1a failed: -4 Bluetooth: hci1: Opcode 0x0406 failed: -4 ================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x107/0x7bd0 kernel/locking/lockdep.c:4919 Read of size 8 at addr ffff888058f9b540 by task syz.3.638/6507 CPU: 0 PID: 6507 Comm: syz.3.638 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 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 __lock_acquire+0x107/0x7bd0 kernel/locking/lockdep.c:4919 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x32/0x50 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] bt_accept_unlink+0x5f/0x290 net/bluetooth/af_bluetooth.c:262 l2cap_sock_teardown_cb+0x1af/0x380 net/bluetooth/l2cap_sock.c:1666 l2cap_chan_del+0xab/0x620 net/bluetooth/l2cap_core.c:682 l2cap_conn_del+0x3c5/0x6a0 net/bluetooth/l2cap_core.c:1957 l2cap_connect_cfm+0x125/0x11e0 net/bluetooth/l2cap_core.c:8470 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:5591 hci_disconnect_all_sync net/bluetooth/hci_sync.c:5604 [inline] hci_suspend_sync+0x445/0xd20 net/bluetooth/hci_sync.c:6086 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+0x585/0x5f0 fs/char_dev.c:414 do_dentry_open+0x7dd/0x10b0 fs/open.c:882 do_open fs/namei.c:3634 [inline] path_openat+0x2674/0x2f10 fs/namei.c:3791 do_filp_open+0x1ee/0x420 fs/namei.c:3818 do_sys_openat2+0x14b/0x4f0 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: 0033:0x7f8ffe19de59 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:00007f8fff0c6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f8ffe425fa0 RCX: 00007f8ffe19de59 RDX: 0000000000000400 RSI: 0000200000000200 RDI: ffffffffffffff9c RBP: 00007f8ffe233e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8ffe426038 R14: 00007f8ffe425fa0 R15: 00007ffdb46a9a98 Allocated by task 6206: 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_node_track_caller+0xb0/0x240 mm/slab_common.c:956 kmalloc_reserve net/core/skbuff.c:446 [inline] __alloc_skb+0x226/0x7d0 net/core/skbuff.c:515 alloc_skb include/linux/skbuff.h:1303 [inline] sctp_packet_pack net/sctp/output.c:472 [inline] sctp_packet_transmit+0xf2f/0x2960 net/sctp/output.c:621 sctp_outq_flush_transports net/sctp/outqueue.c:1173 [inline] sctp_outq_flush+0xeb6/0x3140 net/sctp/outqueue.c:1221 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:-1 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline] sctp_do_sm+0x4f05/0x5610 net/sctp/sm_sideeffect.c:1170 sctp_assoc_bh_rcv+0x3ee/0x630 net/sctp/associola.c:1054 sctp_backlog_rcv+0x158/0x360 net/sctp/input.c:346 sk_backlog_rcv include/net/sock.h:1138 [inline] __release_sock+0x1e6/0x460 net/core/sock.c:2954 release_sock+0x5b/0x1b0 net/core/sock.c:3520 sctp_sendmsg+0x1bed/0x2940 net/sctp/socket.c:2042 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] __sys_sendto+0x497/0x650 net/socket.c:2153 __do_sys_sendto net/socket.c:2165 [inline] __se_sys_sendto net/socket.c:2161 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2161 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 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/0x950 kernel/rcu/tree.c:2849 netlink_release+0x157e/0x19b0 net/netlink/af_netlink.c:799 __sock_release net/socket.c:654 [inline] sock_close+0xbf/0x210 net/socket.c:1400 __fput+0x20a/0x8b0 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/0x950 kernel/rcu/tree.c:2849 netlink_release+0x157e/0x19b0 net/netlink/af_netlink.c:799 __sock_release net/socket.c:654 [inline] sock_close+0xbf/0x210 net/socket.c:1400 __fput+0x20a/0x8b0 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 The buggy address belongs to the object at ffff888058f9b000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1344 bytes inside of 2048-byte region [ffff888058f9b000, ffff888058f9b800) The buggy address belongs to the physical page: page:ffffea000163e600 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888058f9c000 pfn:0x58f98 head:ffffea000163e600 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001d6ee08 ffffea0001e4f808 ffff888017442000 raw: ffff888058f9c000 0000000000080002 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 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4272, tgid 4272 (syz-executor), ts 73823277630, free_ts 22807528304 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2560 prep_new_page mm/page_alloc.c:2567 [inline] get_page_from_freelist+0x206b/0x2180 mm/page_alloc.c:4358 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5658 alloc_slab_page+0x5d/0x180 mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x87/0x2d0 mm/slub.c:1997 ___slab_alloc+0xbc5/0x1240 mm/slub.c:3154 __slab_alloc mm/slub.c:3240 [inline] slab_alloc_node mm/slub.c:3325 [inline] __kmem_cache_alloc_node+0x126/0x270 mm/slub.c:3398 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc_node_track_caller+0xa0/0x240 mm/slab_common.c:956 kmalloc_reserve net/core/skbuff.c:446 [inline] __alloc_skb+0x226/0x7d0 net/core/skbuff.c:515 alloc_skb include/linux/skbuff.h:1303 [inline] nlmsg_new include/net/netlink.h:998 [inline] inet6_ifinfo_notify+0x6c/0x110 net/ipv6/addrconf.c:6108 addrconf_notify+0xc4d/0xf60 net/ipv6/addrconf.c:3705 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] __dev_notify_flags+0x1a7/0x310 net/core/dev.c:8715 dev_change_flags+0xda/0x1a0 net/core/dev.c:8753 do_setlink+0xbc7/0x29c0 net/core/rtnetlink.c:2837 __rtnl_newlink net/core/rtnetlink.c:3614 [inline] rtnl_newlink+0x16e4/0x1f90 net/core/rtnetlink.c:3661 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1487 [inline] free_pcp_prepare mm/page_alloc.c:1537 [inline] free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3509 free_contig_range+0x9d/0x150 mm/page_alloc.c:9626 destroy_args+0xef/0xa0e mm/debug_vm_pgtable.c:1031 debug_vm_pgtable+0x33c/0x38e mm/debug_vm_pgtable.c:1359 do_one_initcall+0x257/0x800 init/main.c:1309 do_initcall_level+0x13d/0x1ed init/main.c:1382 do_initcalls+0x4b/0x8a init/main.c:1398 kernel_init_freeable+0x401/0x5ab init/main.c:1637 kernel_init+0x19/0x1b0 init/main.c:1525 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff888058f9b400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888058f9b480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888058f9b500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888058f9b580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888058f9b600: fb 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