[issue1984] hammer mount fails after crash - HAMMER: FIFO record bad head signature ..

[Matthew Dillon]

:Thomas Nikolajsen <thomas.nikolajsen at mail.dk> added the comment:
:
:The file system is 20GB.
:
:I know this is rather small for a HAMMER FS.
:It is just a root file system, for a x86_64 setup,
:had to 'steal' from swap partition (still have 12GB for 8 GB mem)
:it is not full at all.
:Disklabel was already setup with i386 DragonFly system;
:btw setting up dual boot i386/x86_64 works out quite easily w/ dloader ;-)
:
:show-undo output is put on leaf:
:http://leaf.dragonflybsd.org/~thomas/issue1984
:
:Using supplied patch file system mounts R/W;
:initially i mounted from i386 DragonFly, it seems fine.
:
:After that I installed kernel w/ patch on x86_64 system,
:it also mounted FS (now as root);
:but after running for a few seconds it started giving errors;
:the hammer_del_buffers message seemed endless; I had to power cycle.
:
:I have no immediate plans to reformat FS; so if you have more ideas
:on how to fix this I am all ears.
:
: -thomas

    How is it after the power cycle?  Is it still throwing errors?

    I'm probably not flushing the undo buffers out of the buffer cache
    in the error path for this particular error, and if that is the
    case it should be possible to mount it R+W, sync, umount, and remount
    R+W again and the messages should go away.

						-Matt