panic: assertion: error == 0 in hammer_start_transaction

[Rumko]

Matthew Dillon wrote:

> 
> :...
> :few "RPC timeout for server 192.168.0.16" before the network starts working
> :and goes on booting, but if I run the vkernel under gdb, I only get perhaps
> :2 of those messages and after that nothing happens - gets stuck) which was
> :semi-diskless (root on nfs, and one hammer fs partition on the first vkd,
> :but since it was stuck at the RPC timeout messages it shouldn't have gotten
> :far enough to mount the root, let alone the local hammer partition - unless
> :it started booting sometime during the night).
> :
> :The backtrace:
> :panic: assertion: error == 0 in hammer_start_transaction
> :mp_lock = 00000000; cpuid = 0
> :Trace beginning at frame 0xe28c9968
> :panic(e28c998c,c02c6806,e28c9a84,c39a6738,e28c99a8) at panic+0x14d
> :...
> :The dump is located at leaf:~rumko/crash/{kernel,vmcore}.0
> :
> :The kernel was compiled on the 2nd January around noon CET ... so the
> :sources should have been from around then as well.
> :--
> :Regards,
> :Rumko
> 
>     Looking at the core the error code was 6, ENXIO, which implies
>     the underlying block device to the HAMMER filesystem went away.
> 
>     It looks like a HAMMER mount on /mnt, backed by a VN device
>     (/dev/vn0s1a):
> 
>     f_mntonname = "/mnt", '\0' <repeats 75 times>,
>     f_mntfromname = "VROOT", '\0' <repeats 74 times>,
> 
>     vol_name = 0xe1c84080 "/dev/vn0s1a",
> 
>     My guess is that your VN device is backed by a file over NFS
>     and NFS errored out.
> 
> -Matt
> Matthew Dillon
> <dillon at backplane.com>

Ah damn. In that case nevermind, I wonder what I was doing, hm.
-- 
Regards,
Rumko