Date: Thu, 8 Apr 2004 16:08:39 -0700 From: Cory Petkovsek <cory@adaptableit.com> To: freebsd-questions@freebsd.org Subject: sendmail/strace hanging Message-ID: <20040408230839.GH4101@adaptableit.com>
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I'm running the 5.2 branch, last updated about 3/23-28. Last night I was
working on forwarding sendmail on my freebsd workstation to my solaris
mailhub. I modified my rc.conf to change:
sendmail_enable="YES"
to
sendmail_enable="NO"
sendmail_submit_enable="YES"
Then I worked on making a submit sendmail cf. I ran `sh /etc/rc.sendmail` and
it restarted the daemons. Things worked fine. I could run mailq and sendmail
as normal (aside from mail level problems).
In the mean time I got side tracked with a solaris problem. I left that root
window open and tackled solaris. When I came back to that window, things were
not working quite right. `mailq` delayed for about 1min 15 seconds before
displaying anything. It took about as long to send a message `echo
test|sendmail cory`. Prompt comes back, but the process sits there for some
time.
Stopping sendmail with `sh /etc/rc.sendmail stop` works quickly. Starting it
takes about 3min. Both sendmail-submit and sendmail-clientmqueue take a
while before moving. Booting also has this delay.
I have since commented out both sendmail lines in the rc.conf. I've also reset
the sendmail configuration in /etc/mail. I did a cvsup with src-alll
tag=RELENG_5_2 and did a make build/installworld last night. Still have the
delay. Mergemaster replaced sendmail.cf, but saw no difference with
rc.sendmail.
Now for the fun part. I installed strace to see what was going on. Strace
exibited similar blocking! ARRGGHH! doing an `strace ls` on one window and an
`strace -p` in another shows it blocking at ioctl(3, PIOCWAIT
If I hit ctrl-z and then `fg` on the `strace ls` window it instantly runs.
If I `strace mailq`, again it blocks. `strace -p` in another window
shows same thing. Doing a ctrl-z/fg makes it go and I get a bunch of output
followed by this at the end:
execve("/usr/libexec/sendmail/sendmail", [""], [/* 0 vars */]PIOCWSTOP:
Input/output error
If I `mailq` and strace -p while it blocks I see it waiting at:
kevent(0x3, 0xbfbfbcc0, 0x1, 0xbfbfbcc0, 0x1, 0xbfbfbca0
with a wchan of kqread.
What happend?
Cory
--
Cory Petkovsek Adapting Information
Adaptable IT Consulting Technology to Your
(858) 705-1655 Business
cory@AdaptableIT.com www.AdaptableIT.com
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