[hylafax-users] sendfax sometimes hangs, can't identify protocol?

[Mark Hunting <mark@xxxxxxxxxx>]

Hi,

I manage a Hylafax server with 60 phone lines (2x ISDN30). It works very 
well, but sometimes a sendfax process hangs forever. You'll understand 
I'm looking for a solution to this problem.

The problem only seems to appear when lots of faxes are inserted at the 
same time. For example sometimes sendfax is called 25000 times from a 
loop in a Perl script. Once in a while one or two sendfax processes will 
hang, instead of sending the fax. It hangs for days, untill I kill the 
sendfax process manually. The hanging processes are not always the ones 
that are called from within the Perl loop, but the problem only seems to 
occur when the server is busy perfoming such a loop.

For example I now have this hanging process (from 4 days ago):

uucp     29579  0.0  0.0   5368  1948 ?        S    May03   0:00 
/usr/bin/sendfax -m -T 3 -I 300 -n -k now + 3 days -P 128 -f 
xxxxxx@xxxxxxxxxxxxxx -d 003323xxxxxxx 
/var/spool/hylafax/html_files//parsed_mail_body-29509-1.ps

A list of open files gives:
lsof|grep 29579
sendfax   29579   uucp  cwd       DIR        8,1       0     228042 
/home/faxapp/tmp/temp.1178183572.29509.0qCVob12eOakIXT (deleted)
sendfax   29579   uucp  rtd       DIR        8,1    4096          2 /
sendfax   29579   uucp  txt       REG        8,7   21276      16847 
/usr/bin/sendfax
sendfax   29579   uucp  mem       REG        0,0                  0 
[heap] (stat: No such file or directory)
sendfax   29579   uucp  mem       REG        8,1   34320     114732 
/lib/tls/i686/cmov/libnss_nis-2.3.6.so
sendfax   29579   uucp  mem       REG        8,1   76548     114727 
/lib/tls/i686/cmov/libnsl-2.3.6.so
sendfax   29579   uucp  mem       REG        8,1   30428     114728 
/lib/tls/i686/cmov/libnss_compat-2.3.6.so
sendfax   29579   uucp  mem       REG        8,1   38372     114730 
/lib/tls/i686/cmov/libnss_files-2.3.6.so
sendfax   29579   uucp  mem       REG        8,7 1209120     402847 
/usr/lib/locale/locale-archive
sendfax   29579   uucp  mem       REG        8,7  127488     404846 
/usr/lib/libjpeg.so.62.0.0
sendfax   29579   uucp  mem       REG        8,1    9592     114724 
/lib/tls/i686/cmov/libdl-2.3.6.so
sendfax   29579   uucp  mem       REG        8,1 1241392     114721 
/lib/tls/i686/cmov/libc-2.3.6.so
sendfax   29579   uucp  mem       REG        8,1   41096      97837 
/lib/libgcc_s.so.1
sendfax   29579   uucp  mem       REG        8,1  145136     114725 
/lib/tls/i686/cmov/libm-2.3.6.so
sendfax   29579   uucp  mem       REG        8,7  909044     402640 
/usr/lib/libstdc++.so.6.0.8
sendfax   29579   uucp  mem       REG        8,1    9656     114740 
/lib/tls/i686/cmov/libutil-2.3.6.so
sendfax   29579   uucp  mem       REG        8,1   21868     114723 
/lib/tls/i686/cmov/libcrypt-2.3.6.so
sendfax   29579   uucp  mem       REG        8,7   78500     402404 
/usr/lib/libz.so.1.2.3
sendfax   29579   uucp  mem       REG        8,7  343712     404848 
/usr/lib/libtiff.so.4.2.1
sendfax   29579   uucp  mem       REG        8,1   29700      97815 
/lib/libpam.so.0.79
sendfax   29579   uucp  mem       REG        8,7  462292     404879 
/usr/lib/hylafax/libfaxutil.so.4.3.1
sendfax   29579   uucp  mem       REG        8,1   88164      97730 
/lib/ld-2.3.6.so
sendfax   29579   uucp    0r      REG        8,8    5443   17641436 
/var/spool/qmail/mess/22/17641436
sendfax   29579   uucp    1w     FIFO        0,6           10039767 pipe
sendfax   29579   uucp    2w     FIFO        0,6           10039603 pipe
sendfax   29579   uucp    3u     IPv4   10039771                TCP 
localhost:44692->localhost:hylafax (ESTABLISHED)
sendfax   29579   uucp    4u     sock        0,5           10039613 
can't identify protocol
sendfax   29579   uucp    5u     IPv4   10039771                TCP 
localhost:44692->localhost:hylafax (ESTABLISHED)

Can the 'can't identify protocol' line maybe be the problem? And if it 
is, what can I do about it?

I use HylaFAX 4.3.1, on a Debian 4.0 server (i686, kernel 2.6.18). I'm 
using two Eicon Diva Server PRI cards, with a brand new beta driver 
(provided by Eicon). But I also had this problem on another Debian 
server with a 2.6.17 kernel and an older, officially released, Eicon driver.

Thanks a lot,
Mark




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