Hello, syzbot found the following issue on: HEAD commit: 5f5673607153 Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=12881980580000 kernel config: https://syzkaller.appspot.com/x/.config?x=dedbcb1ff4387972 dashboard link: https://syzkaller.appspot.com/bug?extid=9265e754091c2d27ea29 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/40172aed5414/disk-5f567360.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/58372f305e9d/vmlinux-5f567360.xz kernel image: https://storage.googleapis.com/syzbot-assets/d2aae6fa798f/Image-5f567360.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9265e754091c2d27ea29@xxxxxxxxxxxxxxxxxxxxxxxxx kobject: kobject_add_internal failed for hci0:201 with -EEXIST, don't try to register things with the same name in the same directory. Bluetooth: hci0: failed to register connection device ================================================================== BUG: KASAN: slab-use-after-free in l2cap_sock_ready_cb+0xc4/0x130 net/bluetooth/l2cap_sock.c:1670 Read of size 8 at addr ffff0000da74b188 by task kworker/u9:6/6425 CPU: 0 UID: 0 PID: 6425 Comm: kworker/u9:6 Not tainted 6.11.0-rc7-syzkaller-g5f5673607153 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Workqueue: hci0 hci_rx_work Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:319 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:326 __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:119 print_address_description mm/kasan/report.c:377 [inline] print_report+0x198/0x538 mm/kasan/report.c:488 kasan_report+0xd8/0x138 mm/kasan/report.c:601 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 l2cap_sock_ready_cb+0xc4/0x130 net/bluetooth/l2cap_sock.c:1670 l2cap_chan_ready net/bluetooth/l2cap_core.c:1256 [inline] l2cap_le_start+0xa6c/0x1384 net/bluetooth/l2cap_core.c:1368 l2cap_conn_ready net/bluetooth/l2cap_core.c:1624 [inline] l2cap_connect_cfm+0x57c/0xe24 net/bluetooth/l2cap_core.c:7286 hci_connect_cfm+0xa0/0x13c include/net/bluetooth/hci_core.h:1960 le_conn_complete_evt+0xa1c/0xf0c net/bluetooth/hci_event.c:5761 hci_le_conn_complete_evt+0x114/0x404 net/bluetooth/hci_event.c:5787 hci_le_meta_evt+0x2a4/0x478 net/bluetooth/hci_event.c:7135 hci_event_func net/bluetooth/hci_event.c:7443 [inline] hci_event_packet+0x890/0x106c net/bluetooth/hci_event.c:7498 hci_rx_work+0x318/0xa80 net/bluetooth/hci_core.c:4023 process_one_work+0x79c/0x15b8 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x978/0xec4 kernel/workqueue.c:3389 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Allocated by task 6795: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:565 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4162 [inline] __kmalloc_noprof+0x2a4/0x498 mm/slub.c:4174 kmalloc_noprof include/linux/slab.h:685 [inline] sk_prot_alloc+0xc4/0x1f0 net/core/sock.c:2096 sk_alloc+0x44/0x3f0 net/core/sock.c:2149 bt_sock_alloc+0x4c/0x304 net/bluetooth/af_bluetooth.c:148 l2cap_sock_alloc net/bluetooth/l2cap_sock.c:1877 [inline] l2cap_sock_create+0x140/0x2b8 net/bluetooth/l2cap_sock.c:1917 bt_sock_create+0x14c/0x248 net/bluetooth/af_bluetooth.c:132 __sock_create+0x43c/0x884 net/socket.c:1571 sock_create net/socket.c:1622 [inline] __sys_socket_create net/socket.c:1659 [inline] __sys_socket+0x134/0x340 net/socket.c:1706 __do_sys_socket net/socket.c:1720 [inline] __se_sys_socket net/socket.c:1718 [inline] __arm64_sys_socket+0x7c/0x94 net/socket.c:1718 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Freed by task 6794: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:579 poison_slab_object+0x128/0x180 mm/kasan/common.c:240 __kasan_slab_free+0x3c/0x70 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2256 [inline] slab_free mm/slub.c:4477 [inline] kfree+0x154/0x3e0 mm/slub.c:4598 sk_prot_free net/core/sock.c:2132 [inline] __sk_destruct+0x4b8/0x74c net/core/sock.c:2224 sk_destruct net/core/sock.c:2239 [inline] __sk_free+0x388/0x4f4 net/core/sock.c:2250 sk_free+0x60/0xc8 net/core/sock.c:2261 sock_put include/net/sock.h:1884 [inline] l2cap_sock_kill+0x12c/0x234 net/bluetooth/l2cap_sock.c:1250 l2cap_sock_release+0x138/0x1b4 net/bluetooth/l2cap_sock.c:1421 __sock_release net/socket.c:659 [inline] sock_close+0xa4/0x1e8 net/socket.c:1421 __fput+0x1bc/0x774 fs/file_table.c:422 ____fput+0x20/0x30 fs/file_table.c:450 task_work_run+0x230/0x2e0 kernel/task_work.c:228 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x178/0x1f4 arch/arm64/kernel/entry-common.c:151 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:713 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 The buggy address belongs to the object at ffff0000da74b000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 392 bytes inside of freed 2048-byte region [ffff0000da74b000, ffff0000da74b800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000da74e000 pfn:0x11a748 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000000240(workingset|head|node=0|zone=2|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 05ffc00000000240 ffff0000c0002000 fffffdffc369c610 fffffdffc3093810 raw: ffff0000da74e000 0000000000080006 00000001fdffffff 0000000000000000 head: 05ffc00000000240 ffff0000c0002000 fffffdffc369c610 fffffdffc3093810 head: ffff0000da74e000 0000000000080006 00000001fdffffff 0000000000000000 head: 05ffc00000000003 fffffdffc369d201 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000da74b080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000da74b100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000da74b180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000da74b200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000da74b280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
