Hello, syzbot found the following issue on: HEAD commit: 2d5404caa8c7 Linux 6.12-rc7 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1357fe30580000 kernel config: https://syzkaller.appspot.com/x/.config?x=dcca673786a14715 dashboard link: https://syzkaller.appspot.com/bug?extid=a9a4bedfca6aa9d7fa24 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/a2910755fac8/disk-2d5404ca.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a135257837ee/vmlinux-2d5404ca.xz kernel image: https://storage.googleapis.com/syzbot-assets/3f8930906164/bzImage-2d5404ca.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a9a4bedfca6aa9d7fa24@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in hci_cmd_complete_evt+0xd7b/0xeb0 net/bluetooth/hci_event.c:4221 hci_cmd_complete_evt+0xd7b/0xeb0 net/bluetooth/hci_event.c:4221 hci_event_func net/bluetooth/hci_event.c:7440 [inline] hci_event_packet+0x11df/0x1c20 net/bluetooth/hci_event.c:7495 hci_rx_work+0x9d1/0x11f0 net/bluetooth/hci_core.c:4031 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 stored to memory at: hci_cmd_complete_evt+0xaf4/0xeb0 hci_event_func net/bluetooth/hci_event.c:7440 [inline] hci_event_packet+0x11df/0x1c20 net/bluetooth/hci_event.c:7495 hci_rx_work+0x9d1/0x11f0 net/bluetooth/hci_core.c:4031 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:494 [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+0xb2b/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: 0 UID: 0 PID: 5791 Comm: kworker/u9:2 Not tainted 6.12.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Workqueue: hci1 hci_rx_work ===================================================== --- 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
