[Bug 774852] Re: Postfix 'local' crashes

[Clint Byrum]

Albrecht, I'm getting no such failure on my amd64 11.04 machines, I
wonder if this is a problem for powerpc only.

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Title:
  Postfix 'local' crashes

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[Bug 774852] Re: Postfix 'local' crashes

[Clint Byrum]

Albrecht, it would help us determine the status of this bug if you could
run

sudo apport-collect 774852

in a terminal

Thanks!

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Title:
  Postfix 'local' crashes

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[Bug 774852] Re: Postfix 'local' crashes

[Albrecht Dreß]

apport information

** Tags added: apport-collected natty

** Description changed:

  Binary package hint: postfix
  
  Ubuntu version: Ubuntu 11.04
  Package version:  postfix 2.8.2-1ubuntu1
  System: PowerMac G4 "Silver"
  
  After an update of my box from 10.10 to 11.04, the 'local' delivery
  agent of Postfix stopped working.  I added verbose debugging for it in
  /etc/postfix/master.cf, and get the following results in
  /var/log/mail.log:
  
  May  1 14:34:23 antares postfix/local[8296]: name_mask: ipv4
  May  1 14:34:23 antares postfix/local[8296]: inet_addr_local: configured 2 
IPv4 addresses
  May  1 14:34:23 antares postfix/local[8296]: process generation: 20 (20)
  May  1 14:34:23 antares postfix/local[8296]: Compiled against Berkeley DB: 
4.8.30?
  May  1 14:34:23 antares postfix/local[8296]: Run-time linked against Berkeley 
DB: 4.8.30?
  May  1 14:34:23 antares postfix/local[8296]: dict_open: hash:/etc/aliases
  May  1 14:34:23 antares postfix/local[8296]: match_string: fast_flush_domains 
~? debug_peer_list
  May  1 14:34:23 antares postfix/local[8296]: match_string: fast_flush_domains 
~? fast_flush_domains
  May  1 14:34:23 antares postfix/local[8296]: set_eugid: euid 112 egid 124
  May  1 14:34:23 antares postfix/local[8296]: name_mask: alias
  May  1 14:34:23 antares postfix/local[8296]: name_mask: forward
  May  1 14:34:23 antares postfix/local[8296]: name_mask: alias
  May  1 14:34:23 antares postfix/local[8296]: name_mask: forward
  May  1 14:34:23 antares postfix/local[8296]: name_mask: canonical
  May  1 14:34:23 antares postfix/local[8296]: name_mask: virtual
  May  1 14:34:23 antares postfix/local[8296]: name_mask: command
  May  1 14:34:23 antares postfix/local[8296]: name_mask: file
  May  1 14:34:23 antares postfix/local[8296]: name_mask: forward
  May  1 14:34:23 antares postfix/local[8296]: name_mask: fcntl
  May  1 14:34:23 antares postfix/local[8296]: name_mask: dotlock
  May  1 14:34:23 antares postfix/local[8296]: fatal: unable to determine open 
file limit
  May  1 14:34:24 antares postfix/master[8124]: warning: process 
/usr/lib/postfix/local pid 8296 exit status 1
  May  1 14:34:24 antares postfix/master[8124]: warning: 
/usr/lib/postfix/local: bad command startup -- throttling
  
  Observed effects: see above
  Expected results: 'local' delivery should work.
+ --- 
+ Architecture: powerpc
+ DistroRelease: Ubuntu 11.04
+ Package: postfix 2.8.2-1ubuntu2
+ PackageArchitecture: powerpc
+ ProcEnviron:
+  LANGUAGE=de_DE:en
+  PATH=(custom, no user)
+  LANG=de_DE.UTF-8
+  SHELL=/bin/bash
+ Tags:  natty
+ Uname: Linux 2.6.36.2 ppc
+ UpgradeStatus: Upgraded to natty on 2011-04-30 (6 days ago)
+ UserGroups:

** Attachment added: "Dependencies.txt"
   
https://bugs.launchpad.net/bugs/774852/+attachment/2117900/+files/Dependencies.txt

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Title:
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[Bug 774852] Re: Postfix 'local' crashes

[Albrecht Dreß]

Hi Clint:

Asking Google about this issue, I found some complaints from Gentoo
users related to glibc 2.13 and pre-linking [1].  However, the prelink
package is not installed on my box, and installing it doesn't change
anything.  It might have been a build issue, though.

An other source might be the fact that the PowerPC is a big-endian, but
I doubt that this is the source, as I *never* had any problem with
Postfix in the past, neither with Ubuntu, nor with Yellowdog or Fedora I
used in the past.

Thanks, Albrecht

[1]


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Title:
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[Bug 774852] Re: Postfix 'local' crashes

[Albrecht Dreß]

I re-compiled the package with some extra information (added
strerror(errno) at varoius places).  The reason for the failing 'local'
process is in src/util/open_limit.c, where the call to getrlimit (yes,
*not* setrlimit!) fails with EPERM.  That's really strange!

BTW, I don't have SElinux enabled...

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[Bug 774852] Re: Postfix 'local' crashes

[Patrick van Oostrom]

I am having the same issues on my boxes, running i386

This is what I found in the mail.log

May 12 08:45:50 vps594 postfix/postdrop[6857]: fatal: getrlimit: Operation not 
permitted
May 12 08:45:51 vps594 postfix/sendmail[6856]: warning: command 
"/usr/sbin/postdrop -r" exited with status 1
May 12 08:45:51 vps594 postfix/sendmail[6856]: fatal: patrick(1000): unable to 
execute /usr/sbin/postdrop -r: Success
May 12 08:46:04 vps594 postfix/local[6861]: fatal: unable to determine open 
file limit
May 12 08:46:05 vps594 postfix/master[3986]: warning: process 
/usr/lib/postfix/local pid 6861 exit status 1
May 12 08:46:05 vps594 postfix/master[3986]: warning: /usr/lib/postfix/local: 
bad command startup -- throttling

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[Bug 774852] Re: Postfix 'local' crashes

[Albrecht Dreß]

Side note: the following code runs fine on my box:


#include 
#include 

int main(int argc, char **argv)
{
struct rlimit rl;
int result;

result = getrlimit(RLIMIT_NOFILE, &rl);
printf("%d -> %d %d\n", result, (int) rl.rlim_cur, (int) rl.rlim_max);
return 0;
}


Running it as user, the result is

albrecht@antares:~/ubuntu$ ./test_lim 
0 -> 1024 4096

Strange!!

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Title:
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[Bug 774852] Re: Postfix 'local' crashes

[Serge Hallyn]

Fascinating.  The getrlimit kernel code should never return -EPERM, nor
lead to any selinux or apparmor calls fwiw.  I'd be curious to see an
strace of local.  If in fact a call to the kernel/sys.c:getrlimit() is
returning -EPERM, then the arguments passed to do_prlimit are being
corrupted along the way.

More likely would seem to be a problem with glibc.  We could try an
instrumented kernel to find out more.

Is this 32- or 64-bit?

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[Bug 774852] Re: Postfix 'local' crashes

[Serge Hallyn]

Marking this 'high' importance as I think it falls into 'Has a severe
impact on a small portion of Ubuntu users'

** Changed in: postfix (Ubuntu)
   Importance: Undecided => High

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[Bug 774852] Re: Postfix 'local' crashes

[Serge Hallyn]

Tried to reproduce this on i386, but couldn't.

Albrecht, it's a long shot, but could you try this modified getrlimit
test program?  (replace 112 and 105 with the gid and uid for postfix,
respectively, if they are different on your system).

#include 
#include 
#include 

int main(int argc, char **argv)
{
struct rlimit rl;
int result;

result = setresgid(0,112,0);
printf("setresgid result is %d\n", result);
result = setresuid(0,105,0);
printf("setresuid result is %d\n", result);
result = getrlimit(RLIMIT_NOFILE, &rl);
printf("%d -> %d %d\n", result, (int) rl.rlim_cur, (int) rl.rlim_max);
return 0;
}

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[Bug 774852] Re: Postfix 'local' crashes

[Albrecht Dreß]

Hi Serge:

Thanks a lot for your comment - the getrlimit() behaviour is indeed
puzzling!

Having a closer look at my system, I believe I found the reason, though.
The Ubuntu upgrade from 10.10 to 11.04 failed to change the bootloader
config (yaboot on Mac's) to boot the kernel coming with the new release.
As a result, I was still running 2.6.36.2 (self-compiled, as I had to
remove some graphics stuff - the Mac shipped with a special Apple OEM
ATI card, which didn't work with the stock kernel; different story).
Sorry, but I really forgot to look at the proper kernel version!

I manually changed yaboot.conf, rebooted - and now postfix runs again,
*without* the getrlimit issue!  This looks like a glibc vs. kernel
incompatibility.  Maybe this is also the reason while Patrick van
Oostrom (#6) has similar effects on i386?  Interesting that *no* other
application showed similar effects.

>From my pov, you could close this one (Tag "user too stupid" :-/ )...

Thanks again for your help,
Albrecht.

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[Bug 774852] Re: Postfix 'local' crashes

[Scott Kitterman]

Marking invalid based on reporter feedback.

** Changed in: postfix (Ubuntu)
   Status: New => Invalid

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