===================================================== BUG: KMSAN: uninit-value in hci_conn_complete_evt net/bluetooth/hci_event.c:2485 [inline] BUG: KMSAN: uninit-value in hci_event_packet+0x12660/0x353a0 net/bluetooth/hci_event.c:5865 CPU: 0 PID: 13798 Comm: kworker/u5:3 Not tainted 5.5.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: hci0 hci_rx_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x220 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 hci_conn_complete_evt net/bluetooth/hci_event.c:2485 [inline] hci_event_packet+0x12660/0x353a0 net/bluetooth/hci_event.c:5865 hci_rx_work+0x3f9/0xd10 net/bluetooth/hci_core.c:4491 process_one_work+0x1552/0x1ef0 kernel/workqueue.c:2264 worker_thread+0xef6/0x2450 kernel/workqueue.c:2410 kthread+0x4b5/0x4f0 kernel/kthread.c:256 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:353 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_poison_shadow+0x66/0xd0 mm/kmsan/kmsan.c:127 kmsan_slab_alloc+0x8a/0xe0 mm/kmsan/kmsan_hooks.c:82 slab_alloc_node mm/slub.c:2774 [inline] __kmalloc_node_track_caller+0xb40/0x1200 mm/slub.c:4382 __kmalloc_reserve net/core/skbuff.c:141 [inline] __alloc_skb+0x2fd/0xac0 net/core/skbuff.c:209 alloc_skb include/linux/skbuff.h:1049 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:339 [inline] bcsp_recv+0x16f7/0x1fa0 drivers/bluetooth/hci_bcsp.c:673 hci_uart_tty_receive+0x35c/0x5d0 drivers/bluetooth/hci_ldisc.c:613 tty_ldisc_receive_buf+0x2ea/0x350 drivers/tty/tty_buffer.c:465 tty_port_default_receive_buf+0x14f/0x1e0 drivers/tty/tty_port.c:38 receive_buf drivers/tty/tty_buffer.c:481 [inline] flush_to_ldisc+0x304/0x800 drivers/tty/tty_buffer.c:533 process_one_work+0x1552/0x1ef0 kernel/workqueue.c:2264 worker_thread+0xef6/0x2450 kernel/workqueue.c:2410 kthread+0x4b5/0x4f0 kernel/kthread.c:256 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:353 =====================================================