Issue #2994 has been updated by davshao.
Apologies, it now seems to me that the problem for my machine may be with: commit f240042b9f9bcfdacd70499659fcc5f55d5e49ab Date: Sun Mar 26 23:35:55 2017 -0700 kernel - Spread IPIs out to more priority levels ---------------------------------------- Bug #2994: Intermittent boot hangs after git: hammer - HAMMER Version 7 http://bugs.dragonflybsd.org/issues/2994#change-13099 * Author: davshao * Status: New * Priority: Normal * Assignee: * Category: * Target version: ---------------------------------------- Bisected to git: hammer - HAMMER Version 7 commit 4c09d9c4fd910651904ede280ad90a4abf3fc5d7 Date: Fri Mar 17 14:06:24 2017 -0700 hammer - HAMMER Version 7 intermittent boot hangs stopping at ums0: <Logitech USB-PS2 Optical Mouse, class 0/0, rev 2.00/20.00, addr 5> on usb ums0: 3 buttons and [XYX] coordinates ID=0 no B_DEVMAGIC (bootdev=0) Boot proceeds normally when using verbose option which is why I can attach the verbose dmesg. The machine uses a refurbished Asus P8H77-V motherboard with several internal hard drives with different OSes using legacy BIOS. $ hammer info Volume identification Label ROOT No. Volumes 1 HAMMER Volumes /dev/serno/WD-WMAYP5624974.s3d Root Volume /dev/serno/WD-WMAYP5624974.s3d FSID 9d8141cd-c974-11e5-9ccd-bd5ff4499104 HAMMER Version 6 Big-block information Total 29669 Used 9119 (30.74%) Reserved 70 (0.24%) Free 20480 (69.03%) Space information No. Inodes 856028 Total size 232G (248881610752 bytes) Used 71G (30.74%) Reserved 560M (0.24%) Free 160G (69.03%) PFS information PFS# Mode Snaps 0 MASTER 0 (root PFS) ---Files-------------------------------- p8h77v_dmesg.txt (63.3 KB) -- You have received this notification because you have either subscribed to it, or are involved in it. To change your notification preferences, please click here: http://bugs.dragonflybsd.org/my/account