syzbot has found a reproducer for the following issue on: HEAD commit: e8784b0aef62 Merge tag 'usb-6.11-rc6' of git://git.kernel... git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1600ea63980000 kernel config: https://syzkaller.appspot.com/x/.config?x=b3e19fd08b312452 dashboard link: https://syzkaller.appspot.com/bug?extid=5c915dc5dd417b83b348 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13ba6d1f980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10dfdadb980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e1d3f7f323a8/disk-e8784b0a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/01c01dcebf01/vmlinux-e8784b0a.xz kernel image: https://storage.googleapis.com/syzbot-assets/53cc8ab0ce4d/bzImage-e8784b0a.xz Bisection is inconclusive: the first bad commit could be any of: b79e04091010 Bluetooth: btintel: Fix null ptr deref in btintel_read_version e7b02296fb40 Bluetooth: Remove BT_HS bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=17d8bd73980000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5c915dc5dd417b83b348@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in l2cap_conless_channel net/bluetooth/l2cap_core.c:6757 [inline] BUG: KMSAN: uninit-value in l2cap_recv_frame+0xc9c5/0x18b10 net/bluetooth/l2cap_core.c:6831 l2cap_conless_channel net/bluetooth/l2cap_core.c:6757 [inline] l2cap_recv_frame+0xc9c5/0x18b10 net/bluetooth/l2cap_core.c:6831 l2cap_recv_acldata+0xdd9/0x2ac0 net/bluetooth/l2cap_core.c:7514 hci_acldata_packet net/bluetooth/hci_core.c:3791 [inline] hci_rx_work+0xb38/0x1130 net/bluetooth/hci_core.c:4028 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3312 worker_thread+0xea7/0x14d0 kernel/workqueue.c:3389 kthread+0x3e2/0x540 kernel/kthread.c:389 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Uninit was created at: slab_post_alloc_hook mm/slub.c:3994 [inline] slab_alloc_node mm/slub.c:4037 [inline] kmem_cache_alloc_node_noprof+0x6bf/0xb80 mm/slub.c:4080 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:583 __alloc_skb+0x363/0x7b0 net/core/skbuff.c:674 alloc_skb include/linux/skbuff.h:1320 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:493 [inline] vhci_get_user drivers/bluetooth/hci_vhci.c:487 [inline] vhci_write+0x128/0x910 drivers/bluetooth/hci_vhci.c:607 new_sync_write fs/read_write.c:497 [inline] vfs_write+0xb2f/0x1550 fs/read_write.c:590 ksys_write+0x20f/0x4c0 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __x64_sys_write+0x93/0xe0 fs/read_write.c:652 x64_sys_call+0x306a/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 0 UID: 0 PID: 5180 Comm: kworker/u9:2 Not tainted 6.11.0-rc5-syzkaller-00310-ge8784b0aef62 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Workqueue: hci0 hci_rx_work ===================================================== --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.
