[Bug 224292] processes are hanging in state ufs / possible deadlock in file system

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224292

--- Comment #1 from Wolfram Schneider <wosch at FreeBSD.org> ---
I googled for similar bug reports and found this:

from 2007, for FreeBSD 6.x


https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=104406
kern/104406: Processes get stuck in "ufs" state under persistent        CPU
load

https://forums.freebsd.org/threads/9150/
We have a problem with FreeBSD 6.2-STABLE (aw62) #2: Fri Jun 22 02:26:27 MSD
2007


some reports about dirhash tuning:

https://forums.freebsd.org/threads/7794/

Try something like procstat -f -w 1 pid_of_httpd or run top -U www -m io to see
disk activity. I ran into same, in our case it the solution was dirhashing:

sysctl -a | grep dirhash

will show you current state, and most likely increasing vfs.ufs.dirhash_maxmem
will solve your problems.      

sysctl -a | grep mem


https://wiki.freebsd.org/WaitChannels
ufs: Waiting to read from a file or directory on a UFS filesystem that is being
written to by another thread, or waiting to write to a local file or directory
that is being read or written by another thread 


https://wiki.freebsd.org/DirhashDynamicMemory

https://forums.freebsd.org/threads/34023/

Since vfs.ufs.dirhash_lowmemcount is already at 25, you should consider
increase vfs.ufs.dirhash_maxmem.

-- 
You are receiving this mail because:
You are the assignee for the bug.