syzbot has found a reproducer for the following issue on: HEAD commit: d082ecbc71e9 Linux 6.14-rc4 git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=13492db0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d66f6f82ee090382 dashboard link: https://syzkaller.appspot.com/bug?extid=a9a4bedfca6aa9d7fa24 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=122c37f8580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10023fdf980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/a9f22e75faf0/disk-d082ecbc.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/336a72a11410/vmlinux-d082ecbc.xz kernel image: https://storage.googleapis.com/syzbot-assets/7180e4935c41/bzImage-d082ecbc.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:4226 hci_cmd_complete_evt+0xd7b/0xeb0 net/bluetooth/hci_event.c:4226 hci_event_func net/bluetooth/hci_event.c:7470 [inline] hci_event_packet+0x11c8/0x1ca0 net/bluetooth/hci_event.c:7525 hci_rx_work+0x699/0x1260 net/bluetooth/hci_core.c:4015 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xc1a/0x1e80 kernel/workqueue.c:3317 worker_thread+0xea7/0x14f0 kernel/workqueue.c:3398 kthread+0x6b9/0xef0 kernel/kthread.c:464 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:148 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:7470 [inline] hci_event_packet+0x11c8/0x1ca0 net/bluetooth/hci_event.c:7525 hci_rx_work+0x699/0x1260 net/bluetooth/hci_core.c:4015 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xc1a/0x1e80 kernel/workqueue.c:3317 worker_thread+0xea7/0x14f0 kernel/workqueue.c:3398 kthread+0x6b9/0xef0 kernel/kthread.c:464 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Uninit was created at: slab_post_alloc_hook mm/slub.c:4121 [inline] slab_alloc_node mm/slub.c:4164 [inline] kmem_cache_alloc_node_noprof+0x907/0xe00 mm/slub.c:4216 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:515 __alloc_skb+0x363/0x7b0 net/core/skbuff.c:606 alloc_skb include/linux/skbuff.h:1331 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:495 [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:586 [inline] vfs_write+0xb34/0x1540 fs/read_write.c:679 ksys_write+0x240/0x4b0 fs/read_write.c:731 __do_sys_write fs/read_write.c:742 [inline] __se_sys_write fs/read_write.c:739 [inline] __x64_sys_write+0x93/0xe0 fs/read_write.c:739 x64_sys_call+0x3161/0x3c30 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: 5777 Comm: kworker/u9:2 Not tainted 6.14.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 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.
