vmstat 'b' (disk busy?) field keeps climbing ...

[Kostik Belousov]

On Mon, Jun 26, 2006 at 01:47:04AM -0300, Marc G. Fournier wrote:
> On Mon, 26 Jun 2006, Marc G. Fournier wrote:
> 
> >3416     1 1004100 ufs     ??  DsJ    0:13.01 
> >/usr/local/libexec/postfix/master
> >3418  3416 1004100 ufs     ??  DJ     0:04.16 qmgr -l -t fifo -u
> >33561  3416 1004100 ufs     ??  DJ     0:00.02 smtp -n smtp-amavis -t unix 
> >-u -o smtp_data_done_timeout=1200
> >33562  3416 1004100 ufs     ??  DJ     0:00.06 local -t unix
> >33565  3416 1004100 ufs     ??  DJ     0:00.02 smtp -n smtp-amavis -t unix 
> >-u -o smtp_data_done_timeout=1200
> >33566  3416 1004100 ufs     ??  DJ     0:00.05 local -t unix
> >33567  3416 1004100 ufs     ??  DJ     0:00.02 lmtp -t unix -u
> >33568  3416 1004100 ufs     ??  DJ     0:00.02 smtp -n smtp-amavis -t unix 
> >-u -o smtp_data_done_timeout=1200
> >33569  3416 1004100 ufs     ??  DJ     0:00.05 local -t unix
> >33570  3416 1004100 ufs     ??  DJ     0:00.05 lmtp -t unix -u
> >33572  3416 1004100 ufs     ??  DJ     0:00.02 smtp -n smtp-amavis -t unix 
> >-u -o smtp_data_done_timeout=1200
> >33573  3416 1004100 ufs     ??  DJ     0:00.05 local -t unix
> >33574  3416 1004100 ufs     ??  DJ     0:00.02 bounce -z -n defer -t unix 
> >-u
> >33577  3416 1004100 ufs     ??  DJ     0:00.05 lmtp -t unix -u
> >33578  3416 1004100 ufs     ??  DJ     0:00.02 smtp -n smtp-amavis -t unix 
> >-u -o smtp_data_done_timeout=1200
> >33580  3416 1004100 ufs     ??  DJ     0:00.05 lmtp -t unix -u
> >33581  3416 1004100 biowr   ??  DJ     0:00.01 bounce -z -n defer -t unix 
> >-u
> >33584  3416 1004100 ufs     ??  DJ     0:00.01 bounce -z -n defer -t unix 
> >-u
> >54491 48090    4000 ufs     ??  D      0:00.79 du -skx 
> >/vm/296/alambredelacalcompartido.com
> >30418 30416    4002 ppwait  pa  Ds     0:00.19 -csh (csh)
> 
> The postfix/master process on PID 3416 is within the 
> alambredelacalcompartido.com vServer/directory structure that is 
> currently blocked for the du ...
> 
> If that helps any ... and none of those processes I can appear to kill off 
> ...
Yes, this looks like a deadlock. As I understand, that's on 6.1-STABLE ?
BTW, do you use snapshots ?

I think that without ddb access, diagnose and debug the problem would be
quite hard.
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