dovecot - Nov 2007 - SIGSEGV (Segmentation fault) with antispam plugin

Hi all.

I am trying to get dovecot (1.0.rc17) running with antispam plugin.

I have created another backend, which executes "sa-learn" from
spamassassin's arsenal. The backend is modeled after sendmail backend.

But I can't seem to get the plugin working wit either my backend or
signature-log.

This is my ".config":
DOVECOT=/usr/src/dovecot-1.0.7
DOVECOT_VERSION=1.0
BACKEND=spamassassin-exec
INSTALLDIR=/usr/lib/dovecot/modules/imap/
PLUGINNAME=antispam

This is how I make the plugin:
make && make install && chmod 644
/usr/lib/dovecot/modules/imap/lib90_antispam_plugin.so


Since Ubuntu server does not come with dovecot sources, I have downloaded
dovecot-1.0.7 and put it in /usr/src. As far as I understand, only the
headers are needed, so this should not be the cause of the crash (if the
headers hadn't changed).

When invoked from dovecot process, the "imap" dies with signal 11.

When running:
strace /usr/sbin/dovecot --exec-mail imap

This is how it ends:
etdents64(8, /* 14 entries */, 4096)   = 592
getdents64(8, /* 0 entries */, 4096)    = 0
open("/usr/lib/dovecot/modules/imap/lib90_antispam_plugin.so",
O_RDONLY) = 9
read(9, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\340\21"...,
512) 512
fstat64(9, {st_mode=S_IFREG|0644, st_size=19252, ...}) = 0
mmap2(NULL, 16148, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 9, 0)
0xb7f29000
mmap2(0xb7f2c000, 4096, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 9, 0x2) = 0xb7f2c000
close(9)                                = 0
close(8)                                = 0
stat64("/var/mail/mailboxes/boky/Maildir/subscriptions", 0xbfc17d2c) =
-1
EACCES (Permission denied)
lstat64("/var/mail/mailboxes/boky/Maildir/cur", 0xbfc17c3c) = -1
EACCES
(Permission denied)
write(2, "imap(boky): ", 12imap(boky): )            = 12
write(2, "Error: ", 7Error: )                  = 7
write(2, "lstat(/var/mail/mailboxes/boky/M"...,
69lstat(/var/mail/mailboxes/boky/Maildir/cur) failed: Permission denied) 69
write(2, "\n", 1
)                       = 1
open("/etc/localtime", O_RDONLY)        = 8
fstat64(8, {st_mode=S_IFREG|0644, st_size=696, ...}) = 0
fstat64(8, {st_mode=S_IFREG|0644, st_size=696, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
0xb7de2000
read(8, "TZif\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\6\0\0\0\6\0"...,
4096) 696
close(8)                                = 0
munmap(0xb7de2000, 4096)                = 0
stat64("/etc/localtime", {st_mode=S_IFREG|0644, st_size=696, ...}) = 0
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV +++
Process 4707 detached

antispam plugin was downloaded from:
http://git.sipsolutions.net/?p=dovecot-antispam.git;a=snapshot;h=HEAD;sf=tgz

Please advise me n next steps; I'm just a beginner with debugging C/C++.


Thank you all.
Boky

On 11/17/2007, Boky (verynotbad at gmail.com) wrote:
> I am trying to get dovecot (1.0.rc17) running with antispam plugin.
<snip>
> DOVECOT=/usr/src/dovecot-1.0.7
Is it 1.0rc17, or 1.0.7?

Please always provide dovecot -n output instead of select snippets...

-- 

Best regards,

Charles

Hi,
> I have created another backend, which executes "sa-learn" from
> spamassassin's arsenal. The backend is modeled after sendmail
> backend. 
Neat. Send me the file or a patch and I'll integrate it.
> But I can't seem to get the plugin working wit either my backend or
> signature-log.
> 
> This is my ".config":
> DOVECOT=/usr/src/dovecot-1.0.7
> DOVECOT_VERSION=1.0
> BACKEND=spamassassin-exec
> INSTALLDIR=/usr/lib/dovecot/modules/imap/
> PLUGINNAME=antispam
That looks right.
> Since Ubuntu server does not come with dovecot sources, I have
> downloaded dovecot-1.0.7 and put it in /usr/src. As far as I
> understand, only the headers are needed, so this should not be the
> cause of the crash (if the headers hadn't changed). 
> 
> When invoked from dovecot process, the "imap" dies with signal
11.
> 
> When running:
> strace /usr/sbin/dovecot --exec-mail imap
> stat64("/etc/localtime", {st_mode=S_IFREG|0644, st_size=696,
...}) = 0
> --- SIGSEGV (Segmentation fault) @ 0 (0) ---
> +++ killed by SIGSEGV +++
> Process 4707 detached 
strace is pretty useless for a segfault. Can you compile everything or
at least the plugin with -g and run it in gdb? I've never had the plugin
segfault on me, maybe your plugin's init code is bad? There are also a
bunch of permission errors that may be causing it.
> antispam plugin was downloaded
>
from:http://git.sipsolutions.net/?p=dovecot-antispam.git;a=snapshot;h=HEAD;sf=tgz
That should be good :)

johannes
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 828 bytes
Desc: This is a digitally signed message part
URL:
<http://dovecot.org/pipermail/dovecot/attachments/20071118/e73f8a34/attachment-0002.bin>