I've been running with this almost identical patch already for some time: diff -up dovecot-2.3.0.1/src/auth/mycrypt.c.libxcrypt dovecot-2.3.0.1/src/auth/mycrypt.c --- dovecot-2.3.0.1/src/auth/mycrypt.c.libxcrypt 2018-02-28 15:28:58.000000000 +0100 +++ dovecot-2.3.0.1/src/auth/mycrypt.c 2018-03-27 10:57:38.447769201 +0200 @@ -14,6 +14,7 @@ # define _XPG6 /* Some Solaris versions require this, some break with this */ #endif #include +#include #include "mycrypt.h" That fixed the build problem I had, but the warning below remains. (Tracking master-2.3 git) Reuben On 19/09/2018 5:34 pm, Aki Tuomi wrote:

This is bit of a longshot, but can you try applying https://github.com/dovecot/core/commit/63a74b9.patch and see if this helps?

Aki

On 19.09.2018 10:33, Reuben Farrelly wrote:

...

glibc-2.28.

There was a posting by Michael Marley on 31/08 saying he saw something similar to this problem after upgrading to 2.28 as well with 'doveadm purge'.

Reuben

On 19/09/2018 4:50 pm, Aki Tuomi wrote:

...

Which glibc version are you using?

Aki

On 19.09.2018 09:39, Reuben Farrelly wrote:

...

Hi Aki,

How did you go with this in the end?  Do you need anything more from me or were you able to reproduce this?

Thanks, Reuben

On 1/09/2018 12:41 am, Reuben Farrelly wrote:

...

Sure:

https://www.reub.net/files/dovecot/lightning-dovecot.conf https://www.reub.net/files/dovecot/thunderstorm-dovecot.conf

Updated nightly.

Reuben

On 1/09/2018 12:26 am, Aki Tuomi wrote:

...

Can you provide doveconf -n?

--- Aki Tuomi Dovecot oy

-------- Original message -------- From: Reuben Farrelly Date: 31/08/2018 17:12 (GMT+02:00) To: Aki Tuomi , Dovecot Mailing List Subject: Re: Dovecot User Listing Error - getpwent() failed: Invalid Argument

No.  Neither of those are installed on either system.

Reuben

On 1/09/2018 12:09 am, Aki Tuomi wrote:   > Could apparmor or selinux be causing this!   >   >   >   > ---   > Aki Tuomi   > Dovecot oy   >   > -------- Original message --------   > From: Reuben Farrelly   > Date: 31/08/2018 16:50 (GMT+02:00)   > To: Dovecot Mailing List   > Subject: Dovecot User Listing Error - getpwent() failed: Invalid Argument   >   > Hi,   >   > I'm running dovecot-2.3 git and seeing on 2 of my Dovecot installations,   > the following message logged quite frequently:   >   > Aug 31 16:55:53 lightning.reub.net dovecot[7698]: auth-worker(7707):   > Error: getpwent() failed: Invalid argument   > Aug 31 16:55:53 lightning.reub.net dovecot[7698]: replicator: Error:   > User listing returned failure   > Aug 31 16:55:53 lightning.reub.net dovecot[7698]: replicator: Error:   > listing users failed, can't replicate existing data   >   > It appears that this could be having an effect on replication, but it's   > unclear because the secondary/replica doesn't see much traffic.   >   > Authentication is via PAM and the system is Gentoo Linux x86_64. passb   > driver = pam, userdb driver = static .   >   > doveadm user -u '*' shows the system users listed twice like this (is   > this a problem?) and then prints:   >   > ----   > reuben   > liam   > reuben   > liam   > <some other users>   > Error: User listing returned failure   > Fatal: user listing failed   > ----   >   > To me that doesn't look right.   >   > Can anyone suggest what could be causing this?  I don't recall seeing   > this message some time ago so I suspect it's a recent change in either   > dovecot, or pam or glibc etc..   >   > Thanks,   > Reuben

Sure: thunderstorm ~ # cat /etc/nsswitch.conf # /etc/nsswitch.conf: # $Header: /var/cvsroot/gentoo/src/patchsets/glibc/extra/etc/nsswitch.conf,v 1.2 2017/08/12 16:21:44 slyfox Exp $ passwd: compat files shadow: compat files group: compat files hosts: files dns networks: files dns services: db files protocols: db files rpc: db files ethers: db files netmasks: files netgroup: files bootparams: files automount: files aliases: files thunderstorm ~ # Reuben On 19/09/2018 5:41 pm, Aki Tuomi wrote:

Can you provide your /etc/nssswitch.conf?

Aki

On 19.09.2018 10:40, Reuben Farrelly wrote:

...

I've been running with this almost identical patch already for some time:

diff -up dovecot-2.3.0.1/src/auth/mycrypt.c.libxcrypt dovecot-2.3.0.1/src/auth/mycrypt.c --- dovecot-2.3.0.1/src/auth/mycrypt.c.libxcrypt       2018-02-28 15:28:58.000000000 +0100 +++ dovecot-2.3.0.1/src/auth/mycrypt.c 2018-03-27 10:57:38.447769201 +0200 @@ -14,6 +14,7 @@  #  define _XPG6 /* Some Solaris versions require this, some break with this */  #endif  #include +#include

 #include "mycrypt.h"

That fixed the build problem I had, but the warning below remains.

(Tracking master-2.3 git)

Reuben

On 19/09/2018 5:34 pm, Aki Tuomi wrote:

...

This is bit of a longshot, but can you try applying https://github.com/dovecot/core/commit/63a74b9.patch and see if this helps?

Aki

On 19.09.2018 10:33, Reuben Farrelly wrote:

...

glibc-2.28.

There was a posting by Michael Marley on 31/08 saying he saw something similar to this problem after upgrading to 2.28 as well with 'doveadm purge'.

Reuben

On 19/09/2018 4:50 pm, Aki Tuomi wrote:

...

Which glibc version are you using?

Aki

On 19.09.2018 09:39, Reuben Farrelly wrote:

...

Hi Aki,

How did you go with this in the end?  Do you need anything more from me or were you able to reproduce this?

Thanks, Reuben

On 1/09/2018 12:41 am, Reuben Farrelly wrote: > Sure: > > https://www.reub.net/files/dovecot/lightning-dovecot.conf > https://www.reub.net/files/dovecot/thunderstorm-dovecot.conf > > Updated nightly. > > Reuben > > > On 1/09/2018 12:26 am, Aki Tuomi wrote: >> Can you provide doveconf -n? >> >> >> >> --- >> Aki Tuomi >> Dovecot oy >> >> -------- Original message -------- >> From: Reuben Farrelly >> Date: 31/08/2018 17:12 (GMT+02:00) >> To: Aki Tuomi , Dovecot Mailing List >> >> Subject: Re: Dovecot User Listing Error - getpwent() failed: >> Invalid >> Argument >> >> No.  Neither of those are installed on either system. >> >> Reuben >> >> On 1/09/2018 12:09 am, Aki Tuomi wrote: >>    > Could apparmor or selinux be causing this! >>    > >>    > >>    > >>    > --- >>    > Aki Tuomi >>    > Dovecot oy >>    > >>    > -------- Original message -------- >>    > From: Reuben Farrelly >>    > Date: 31/08/2018 16:50 (GMT+02:00) >>    > To: Dovecot Mailing List >>    > Subject: Dovecot User Listing Error - getpwent() failed: >> Invalid >> Argument >>    > >>    > Hi, >>    > >>    > I'm running dovecot-2.3 git and seeing on 2 of my Dovecot >> installations, >>    > the following message logged quite frequently: >>    > >>    > Aug 31 16:55:53 lightning.reub.net dovecot[7698]: >> auth-worker(7707): >>    > Error: getpwent() failed: Invalid argument >>    > Aug 31 16:55:53 lightning.reub.net dovecot[7698]: replicator: >> Error: >>    > User listing returned failure >>    > Aug 31 16:55:53 lightning.reub.net dovecot[7698]: replicator: >> Error: >>    > listing users failed, can't replicate existing data >>    > >>    > It appears that this could be having an effect on replication, >> but it's >>    > unclear because the secondary/replica doesn't see much >> traffic. >>    > >>    > Authentication is via PAM and the system is Gentoo Linux >> x86_64. >> passb >>    > driver = pam, userdb driver = static . >>    > >>    > doveadm user -u '*' shows the system users listed twice >> like this >> (is >>    > this a problem?) and then prints: >>    > >>    > ---- >>    > reuben >>    > liam >>    > reuben >>    > liam >>    > <some other users> >>    > Error: User listing returned failure >>    > Fatal: user listing failed >>    > ---- >>    > >>    > To me that doesn't look right. >>    > >>    > Can anyone suggest what could be causing this?  I don't recall >> seeing >>    > this message some time ago so I suspect it's a recent >> change in >> either >>    > dovecot, or pam or glibc etc.. >>    > >>    > Thanks, >>    > Reuben

As a followup to this thread, it is looking increasingly like this is a regression in glibc-2.28. One of the Gentoo devs has reproduced the problem, created a test case and bisected it down to a specific commit that went into glibc in July. For more information see: https://bugs.gentoo.org/667118 Note: it's not a problem with glibc-2.27, but new to 2.28. Reuben On 19/09/2018 6:53 pm, Aki Tuomi wrote:

I have no idea why it's returning invalid argument, maybe you need to raise this as issue with glibc?

Aki

On 19.09.2018 10:43, Reuben Farrelly wrote:

...

Sure:

thunderstorm ~ # cat /etc/nsswitch.conf # /etc/nsswitch.conf: # $Header: /var/cvsroot/gentoo/src/patchsets/glibc/extra/etc/nsswitch.conf,v 1.2 2017/08/12 16:21:44 slyfox Exp $

passwd:      compat files shadow:      compat files group:       compat files

hosts:       files dns networks:    files dns

services:    db files protocols:   db files rpc:         db files ethers:      db files netmasks:    files netgroup:    files bootparams:  files

automount:   files aliases:     files thunderstorm ~ #

Reuben

On 19/09/2018 5:41 pm, Aki Tuomi wrote:

...

Can you provide your /etc/nssswitch.conf?

Aki

On 19.09.2018 10:40, Reuben Farrelly wrote:

...

I've been running with this almost identical patch already for some time:

diff -up dovecot-2.3.0.1/src/auth/mycrypt.c.libxcrypt dovecot-2.3.0.1/src/auth/mycrypt.c --- dovecot-2.3.0.1/src/auth/mycrypt.c.libxcrypt       2018-02-28 15:28:58.000000000 +0100 +++ dovecot-2.3.0.1/src/auth/mycrypt.c 2018-03-27 10:57:38.447769201 +0200 @@ -14,6 +14,7 @@   #  define _XPG6 /* Some Solaris versions require this, some break with this */   #endif   #include +#include

  #include "mycrypt.h"

That fixed the build problem I had, but the warning below remains.

(Tracking master-2.3 git)

Reuben

On 19/09/2018 5:34 pm, Aki Tuomi wrote:

...

This is bit of a longshot, but can you try applying https://github.com/dovecot/core/commit/63a74b9.patch and see if this helps?

Aki

On 19.09.2018 10:33, Reuben Farrelly wrote:

...

glibc-2.28.

There was a posting by Michael Marley on 31/08 saying he saw something similar to this problem after upgrading to 2.28 as well with 'doveadm purge'.

Reuben

On 19/09/2018 4:50 pm, Aki Tuomi wrote: > Which glibc version are you using? > > Aki > > On 19.09.2018 09:39, Reuben Farrelly wrote: >> Hi Aki, >> >> How did you go with this in the end?  Do you need anything more >> from >> me or were you able to reproduce this? >> >> Thanks, >> Reuben >> >> On 1/09/2018 12:41 am, Reuben Farrelly wrote: >>> Sure: >>> >>> https://www.reub.net/files/dovecot/lightning-dovecot.conf >>> https://www.reub.net/files/dovecot/thunderstorm-dovecot.conf >>> >>> Updated nightly. >>> >>> Reuben >>> >>> >>> On 1/09/2018 12:26 am, Aki Tuomi wrote: >>>> Can you provide doveconf -n? >>>> >>>> >>>> >>>> --- >>>> Aki Tuomi >>>> Dovecot oy >>>> >>>> -------- Original message -------- >>>> From: Reuben Farrelly >>>> Date: 31/08/2018 17:12 (GMT+02:00) >>>> To: Aki Tuomi , Dovecot Mailing List >>>> >>>> Subject: Re: Dovecot User Listing Error - getpwent() failed: >>>> Invalid >>>> Argument >>>> >>>> No.  Neither of those are installed on either system. >>>> >>>> Reuben >>>> >>>> On 1/09/2018 12:09 am, Aki Tuomi wrote: >>>>     > Could apparmor or selinux be causing this! >>>>     > >>>>     > >>>>     > >>>>     > --- >>>>     > Aki Tuomi >>>>     > Dovecot oy >>>>     > >>>>     > -------- Original message -------- >>>>     > From: Reuben Farrelly >>>>     > Date: 31/08/2018 16:50 (GMT+02:00) >>>>     > To: Dovecot Mailing List >>>>     > Subject: Dovecot User Listing Error - getpwent() failed: >>>> Invalid >>>> Argument >>>>     > >>>>     > Hi, >>>>     > >>>>     > I'm running dovecot-2.3 git and seeing on 2 of my Dovecot >>>> installations, >>>>     > the following message logged quite frequently: >>>>     > >>>>     > Aug 31 16:55:53 lightning.reub.net dovecot[7698]: >>>> auth-worker(7707): >>>>     > Error: getpwent() failed: Invalid argument >>>>     > Aug 31 16:55:53 lightning.reub.net dovecot[7698]: >>>> replicator: >>>> Error: >>>>     > User listing returned failure >>>>     > Aug 31 16:55:53 lightning.reub.net dovecot[7698]: >>>> replicator: >>>> Error: >>>>     > listing users failed, can't replicate existing data >>>>     > >>>>     > It appears that this could be having an effect on >>>> replication, >>>> but it's >>>>     > unclear because the secondary/replica doesn't see much >>>> traffic. >>>>     > >>>>     > Authentication is via PAM and the system is Gentoo Linux >>>> x86_64. >>>> passb >>>>     > driver = pam, userdb driver = static . >>>>     > >>>>     > doveadm user -u '*' shows the system users listed twice >>>> like this >>>> (is >>>>     > this a problem?) and then prints: >>>>     > >>>>     > ---- >>>>     > reuben >>>>     > liam >>>>     > reuben >>>>     > liam >>>>     > <some other users> >>>>     > Error: User listing returned failure >>>>     > Fatal: user listing failed >>>>     > ---- >>>>     > >>>>     > To me that doesn't look right. >>>>     > >>>>     > Can anyone suggest what could be causing this?  I don't >>>> recall >>>> seeing >>>>     > this message some time ago so I suspect it's a recent >>>> change in >>>> either >>>>     > dovecot, or pam or glibc etc.. >>>>     > >>>>     > Thanks, >>>>     > Reuben