Hello, syzbot found the following issue on: HEAD commit: 93f54a72 instrumented.h: fix KMSAN support git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=13238a42900000 kernel config: https://syzkaller.appspot.com/x/.config?x=fa4f3b91169c2501 dashboard link: https://syzkaller.appspot.com/bug?extid=e4244d85e5b777ac4d3d compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) userspace arch: i386 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=108830ec900000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12f9336c900000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e4244d85e5b777ac4d3d@xxxxxxxxxxxxxxxxxxxxxxxxx Bluetooth: hci0: unknown advertising packet type: 0x2b ===================================================== BUG: KMSAN: uninit-value in hci_bdaddr_is_rpa include/net/bluetooth/hci_core.h:1486 [inline] BUG: KMSAN: uninit-value in process_adv_report+0x781/0x2000 net/bluetooth/hci_event.c:5409 CPU: 0 PID: 2202 Comm: kworker/u5:0 Not tainted 5.8.0-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+0x1df/0x240 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 hci_bdaddr_is_rpa include/net/bluetooth/hci_core.h:1486 [inline] process_adv_report+0x781/0x2000 net/bluetooth/hci_event.c:5409 hci_le_direct_adv_report_evt net/bluetooth/hci_event.c:5837 [inline] hci_le_meta_evt net/bluetooth/hci_event.c:5902 [inline] hci_event_packet+0x1d08/0x33ee0 net/bluetooth/hci_event.c:6155 hci_rx_work+0x95f/0xce0 net/bluetooth/hci_core.c:4705 process_one_work+0x1540/0x1f30 kernel/workqueue.c:2269 worker_thread+0xed2/0x23f0 kernel/workqueue.c:2415 kthread+0x515/0x550 kernel/kthread.c:292 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:293 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:80 slab_alloc_node mm/slub.c:2839 [inline] __kmalloc_node_track_caller+0xb40/0x1200 mm/slub.c:4478 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0x2fd/0xac0 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1083 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:377 [inline] vhci_get_user drivers/bluetooth/hci_vhci.c:165 [inline] vhci_write+0x15b/0x800 drivers/bluetooth/hci_vhci.c:285 call_write_iter include/linux/fs.h:1908 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0xd98/0x1480 fs/read_write.c:578 ksys_write+0x267/0x450 fs/read_write.c:631 __do_sys_write fs/read_write.c:643 [inline] __se_sys_write+0x92/0xb0 fs/read_write.c:640 __ia32_sys_write+0x4a/0x70 fs/read_write.c:640 do_syscall_32_irqs_on arch/x86/entry/common.c:430 [inline] __do_fast_syscall_32+0x2aa/0x400 arch/x86/entry/common.c:477 do_fast_syscall_32+0x6b/0xd0 arch/x86/entry/common.c:505 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:554 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c ===================================================== --- 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. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
