"panic: ffs_blkfree" in recent JPSNAP

[Andrew Boothman]

'ello all!

My 5.0-CURRENT-20021215-JPSNAP system is reliably panic-ing and dropping into the debugger a few minutes after booting.

I was in the process of trying to boot 5.0-RC2's installation floppies, and the boot failed due to a faulty floppy. So I told the loader to boot from my root partition on my HDD instead. This produced some error messages about filesystems not being properly dismounted (not sure if that is true...), but booted anyway. Now, every boot from the HDD produces the panics.

After being up for a few minutes, the machine panics saying (all messages hand-transcribed):

dev=ad0s1e, block=33336, fs=/tmp
panic: ffs_blkfree: freeing free block
Debugger("panic")
Stopped at Debugger+0x54: xchgl %ebx, in_Debugger()

Unfortunately I don't (yet) know the first thing about how to debug something like this, so for the hell of it I typed "trace" and got the following (I'm missing out the values inside the ()'s as thats a lot of writing - but I'll report back anything that the developers need to know) :

Debugger(...)
panic(...)
ffs_blkfree(...)
indir_trunc(...)
handle_workitem_freeblocks(...)
process_worklist_item(...)
softdep_process_worklist(...)
sched_sync(...)
fork_exit(...)
fork_trampoline(...)

If anybody needs more information then please let me know, as I said I have it panic-ing reliably.

I guess that booting single-user and then fsck-ing might well fix the problem, but I wanted to take the opportunity to report what is one of the very few panics I've had in many years of FreeBSD usage. And I'm planning to install RC2 on this machine anyway.

Thanks!

Andrew


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