Hello, syzbot found the following crash on: HEAD commit: 686a4f77 kmsan: don't compile memmove git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=15b019d9e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=e10654781bc1f11c dashboard link: https://syzkaller.appspot.com/bug?extid=d5eabae89ae62371887f compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+d5eabae89ae62371887f@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in hci_cmd_timeout+0x2bd/0x2d0 net/bluetooth/hci_core.c:2637 CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.5.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events hci_cmd_timeout 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_cmd_timeout+0x2bd/0x2d0 net/bluetooth/hci_core.c:2637 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] slab_alloc mm/slub.c:2783 [inline] kmem_cache_alloc+0x711/0xd70 mm/slub.c:2788 skb_clone+0x328/0x5d0 net/core/skbuff.c:1448 hci_cmd_work+0x12f/0x4f0 net/bluetooth/hci_core.c:4527 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 ===================================================== --- This bug 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 bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
