syzbot has found a reproducer for the following issue on: HEAD commit: 8cf0b93919e1 Linux 6.12-rc2 git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=164bc707980000 kernel config: https://syzkaller.appspot.com/x/.config?x=981fe2ff8a1e457a dashboard link: https://syzkaller.appspot.com/bug?extid=6ea290ba76d8c1eb1ac2 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=114bc707980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17b74327980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e6ae962426a8/disk-8cf0b939.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6965b62be377/vmlinux-8cf0b939.xz kernel image: https://storage.googleapis.com/syzbot-assets/1a0056895389/bzImage-8cf0b939.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6ea290ba76d8c1eb1ac2@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in hci_acldata_packet net/bluetooth/hci_core.c:3796 [inline] BUG: KMSAN: uninit-value in hci_rx_work+0x1092/0x11f0 net/bluetooth/hci_core.c:4030 hci_acldata_packet net/bluetooth/hci_core.c:3796 [inline] hci_rx_work+0x1092/0x11f0 net/bluetooth/hci_core.c:4030 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3310 worker_thread+0xea7/0x14f0 kernel/workqueue.c:3391 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:4091 [inline] slab_alloc_node mm/slub.c:4134 [inline] kmem_cache_alloc_node_noprof+0x6bf/0xb80 mm/slub.c:4186 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:587 __alloc_skb+0x363/0x7b0 net/core/skbuff.c:678 alloc_skb include/linux/skbuff.h:1322 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:493 [inline] vhci_get_user drivers/bluetooth/hci_vhci.c:487 [inline] vhci_write+0x127/0x900 drivers/bluetooth/hci_vhci.c:607 new_sync_write fs/read_write.c:590 [inline] vfs_write+0xb28/0x1540 fs/read_write.c:683 ksys_write+0x24f/0x4c0 fs/read_write.c:736 __do_sys_write fs/read_write.c:748 [inline] __se_sys_write fs/read_write.c:745 [inline] __x64_sys_write+0x93/0xe0 fs/read_write.c:745 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: 1 UID: 0 PID: 4565 Comm: kworker/u9:1 Not tainted 6.12.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 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.
