[Dovecot] RE: epoll error when running as proxy

[Václav Haisman]

Bill Boebel wrote:
> Also, for testing in the error message I patched src/lib/ioloop-epoll.c to
> show the "ret" and "errno" variables as well as the variable names, which
> is why there is a bit of extra data in this error message...
> 
> imap-login: io_loop_handle_add: epoll_ctl(op=3, fd=10, ret=-1, errno=2):
> No such file or directory
> 
> Bill
> 
> 
> On Thursday, February 9, 2006 16:32, Bill Boebel said:
>> I am running dovecot 1.0 beta3 as a front-end proxy, and getting the
>> following error when using epoll.  The error goes away if I switch to
>> poll.  On the backend IMAP server I see that the login was successful.
>> The error occurs when I try to retrieve an email or get a folder listing
>> via IMAP after logging in successfully...
>>
>> Feb  9 15:35:57 director4 dovecot: imap-login: proxy(bboebel at webmail.us):
>> started: user=<bboebel at webmail.us>, method=plain, rip=204.119.252.7,
>> lip=192.168.1.68
>> Feb  9 15:09:50 director4 dovecot: imap-login: io_loop_handle_add:
>> epoll_ctl(op=3, fd=10, ret=-1, errno=2): No such file or directory
>> Feb  9 14:58:23 director4 dovecot: child 9688 (login) returned error 89
>>
>> I can't find anything in the mailing list archives about this error, so
>> here are some details.  I hope somebody can point me in the right
>> direction to fix this.
>>
>> - I am running this on Red Hat ES4 (32-bit x86), compiling with the
>> following options:
>>
>> ./configure \
>>   --prefix=/usr \
>>   --sysconfdir=/etc \
>>   --localstatedir=/var \
>>   --with-ssldir=/usr/share/ssl \
>>   --disable-ipv6 \
>>   --with-file-offset-size=32 \
>>   --with-mem-align=4 \
>>   --with-ioloop=epoll \
>>   --without-passwd \
>>   --without-passwd-file \
>>   --without-shadow \
>>   --without-pam \
>>   --without-checkpassword \
>>   --without-bsdauth \
>>   --without-gssapi \
>>   --with-ldap \
>>   --without-vpopmail \
>>   --with-static-userdb \
>>   --with-prefetch-userdb \
>>   --without-pgsql \
>>   --with-mysql \
>>   --without-sqlite \
>>   --without-ssl \
>>   --with-storages=maildir
>>
>> - I have also complied with these options and got the same error:
>>
>> ./configure \
>>   --prefix=/usr \
>>   --sysconfdir=/etc \
>>   --localstatedir=/var \
>>   --with-ioloop=epoll \
>>   --with-mysql
>>
>>
>> - I have also tried the latest CSV snapshot (dovecot-20060209.tar.gz) and
>> 1.0 beta2, and I get the same error.
>>
>> - If I switch to poll instead of epoll, everything works fine.
>>
>> Any ideas?
Could it be that similarly to kqueue on *BSD the Linux kernel
unregisters/removes the handle automatically when it gets closed? And
that dovecot closes it before unregistering it from epoll?

>>
>> Bill
>>
> 

Vaclav Haisman

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