===================================================== BUG: KMSAN: uninit-value in process_adv_report+0x342/0x2a30 net/bluetooth/hci_event.c:5400 CPU: 1 PID: 8253 Comm: kworker/u5:2 Not tainted 5.10.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: hci4 hci_rx_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x21c/0x280 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197 process_adv_report+0x342/0x2a30 net/bluetooth/hci_event.c:5400 hci_le_direct_adv_report_evt net/bluetooth/hci_event.c:5878 [inline] hci_le_meta_evt net/bluetooth/hci_event.c:5944 [inline] hci_event_packet+0x1136b/0x39b30 net/bluetooth/hci_event.c:6269 hci_rx_work+0x74a/0xd30 net/bluetooth/hci_core.c:4926 process_one_work+0x121c/0x1fc0 kernel/workqueue.c:2272 worker_thread+0x10cc/0x2740 kernel/workqueue.c:2418 kthread+0x51c/0x560 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline] kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76 slab_alloc_node mm/slub.c:2906 [inline] __kmalloc_node_track_caller+0xc61/0x15f0 mm/slub.c:4512 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0x309/0xae0 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1094 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:389 [inline] vhci_get_user drivers/bluetooth/hci_vhci.c:165 [inline] vhci_write+0x18a/0x880 drivers/bluetooth/hci_vhci.c:285 call_write_iter include/linux/fs.h:1903 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x1087/0x1b10 fs/read_write.c:605 ksys_write+0x2af/0x4d0 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write+0x92/0xb0 fs/read_write.c:667 __x64_sys_write+0x4a/0x70 fs/read_write.c:667 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48 entry_SYSCALL_64_after_hwframe+0x44/0xa9 =====================================================