Re: All processes go tstile

[Emmanuel Dreyfus <manu%netbsd.org@localhost>]

On Thu, Aug 16, 2018 at 10:03:11AM +0200, J. Hannken-Illjes wrote:
> Looks like a deadlock where we sync a file system, need a new buffer
> and try to free a buffer on a currently suspending file system.
> 
> VFS_SYNC and VOP_BWRITE should be on different mounts here.

Here are the mounts:
/dev/raid3a on / type ffs (log, local)
/dev/raid3e on /home type ffs (nodev, noexec, nosuid, NFS exported, local)

The problem arises while dump is performing a snapshot backup on /home

It is worth noting that /home does not have -o log because frequent
fsync from NFS clients kill performances with -o log. At least it did 
it on netbsd-7, but I do not see why it could have changed on netbsd-8: 
frequent fsync means frequence log flushes on the server.

> Do you have a crash dump?
 
I was not able to get one so far, the dump device is not properly
configured on this system.

-- 
Emmanuel Dreyfus
manu%netbsd.org@localhost