Re: CURRENT (r248061):Thunderbird SIGNAL 11 with OpenLDAP / nscd(1) broken pipe/

From: Per olof Ljungmark <peo_at_intersonic.se>
Date: Sat, 09 Mar 2013 23:21:43 +0100
On 2013-03-09 10:25, Hartmann, O. wrote:
> Am 03/09/13 10:07, schrieb Hartmann, O.:
>> For the introduction, I filed a PR for this at beginning of 2012 and
>> suffered from the very same problem close to two years before on ALL
>> FreeBSD versions and platforms using OpenLDAP as the user backend:
>>
>> ports/164239: [PATCH] mail/thunderbird: crash with nss_ldap
>>
>> Even with the suggested patch by the maintainer the problem stayed.
>>
>> With the introduction of bad code due to updates with > r247804 and the
>> following issues of SIGNAL 13/broken pipe, the problem now is even worse
>> in FreeBSD 10.0 r248061.
>> From my limited point of view I guess this long lasting unresolved
>> problem could have been revealed itself and I hope this could be fixed
>> along with fixing nscd(1).
>>
>> Again, Thunderbird in all flavours since 2010 crashes on FreeBSD 8/9 and
>> now 10.0-CURRENT when it is used on systems with user backend in
>> OpenLDAP or any LDAP (Thunderbird works on non-OpenLDAP backed systems
>> of the same OS revision).
>>
>> I was able to "solve" the problem by starting Firefox first and only
>> Firefox getting started prior to Thunderbird resolved the problem for a
>> while, but closing Firefox and waiting a bit left Thunderbird
>> unstarteable again until Firefox was closed and reopened again.
>>
>> I guess this strange behaviour reveals a deeper issue not necessarily
>> bound to nscd(1) (since the problem with Thunderbird also occurs without
>> nscd(1), BUT always bound to the use of OpenLDAP backend (with
>> security/pam_ldap and net/nss_ldap from ports).
>>
>> Now, on FreeBSD 10.0-CURRENT r248061/amd64, Thunderbird dies immediately
>> with SIGNAL 11 on those boxes with OpenLDAP backend and no "trick" makes
>> Thunderbird starting enymore.
>>
>> In my desperation, I did a truss, see below and it seems to me that
>> there is a problem getting the effective UID, since the SIGNAL 11 arises
>> after geteuid().
>>
>> At the moment, I have switched off nscd(1) by default since it is broken
>> in CURRENT or doing very strange things (see list about broken pipe in
>> the system, sudo(1) or even the port's system (SIGNAL 13)).
>>
>> I think there is a major issue covered and I hope this could be solved
>> by the problems triggered.
>>
>> it is hard to believe that I'm the only one using FreeBSD for both
>> workstation and server environment in conjuction with OpenLDAP and
>> facing the problem with a popular software like Thunderbird.
>>
>> If it is a stupid configuation problem then this must be very, very
>> special since it is now sticky with me for years.
>>
>> Here comes the truss ...:
>>
>> open("/etc/pwd.db",O_RDONLY,00)                  = 4 (0x4)
>> fcntl(4,F_SETFD,FD_CLOEXEC)                      = 0 (0x0)
>> fstat(4,{ mode=-rw-r--r-- ,inode=117927,size=40960,blksize=16384 }) = 0
>> (0x0)
>> read(4,"\0\^F\^Ua\0\0\0\^B\0\0\^D\M-R\0"...,260) = 260 (0x104)
>> pread(0x4,0x801bfc000,0x1000,0x6000,0x1,0x0)     = 4096 (0x1000)
>> pread(0x4,0x813927000,0x1000,0x2000,0x1,0x0)     = 4096 (0x1000)
>> close(4)                                         = 0 (0x0)
>> socket(PF_LOCAL,SOCK_STREAM,0)                   = 4 (0x4)
>> connect(4,{ AF_UNIX "/var/run/nscd" },15)        ERR#2 'No such file or
>> directory'
>> close(4)                                         = 0 (0x0)
>> sigprocmask(SIG_SETMASK,SIGHUP|SIGINT|SIGQUIT|SIGILL|SIGTRAP|SIGABRT|SIGEMT|SIGFPE|SIGKILL|SIGBUS|SIGSEGV|SIGSYS|SIGPIPE|SIGALRM|SIGTERM|SIGURG|SIGSTOP|SIGTSTP|SIGCONT|SIGCHLD|SIGTTIN|SIGTTOU|SIGIO|SIGXCPU|SIGXFSZ|SIGVTALRM|SIGPROF|SIGWINCH|SIGINFO|SIGUSR1|SIGUSR2,0x0)
>> = 0 (0x0)
>> sigaction(SIGPIPE,{ SIG_IGN 0x0 ss_t },{ SIG_IGN SA_RESTART ss_t }) = 0
>> (0x0)
>> sigprocmask(SIG_SETMASK,0x0,0x0)                 = 0 (0x0)
>> getpid()                                         = 3235 (0xca3)
>> geteuid()                                        = 2002 (0x7d2)
>> open("/usr/local/etc/nss_ldap.conf",O_RDONLY,0666) = 4 (0x4)
>> fstat(4,{ mode=-rw-r--r-- ,inode=5818085,size=7997,blksize=16384 }) = 0
>> (0x0)
>> fstat(4,{ mode=-rw-r--r-- ,inode=5818085,size=7997,blksize=16384 }) = 0
>> (0x0)
>> read(4,"_at_(#)$Id: ldap.conf,v 2.47 2006/0"...,16384) = 7997 (0x1f3d)
>> read(4,0x813928000,16384)                        = 0 (0x0)
>> close(4)                                         = 0 (0x0)
>> __sysctl(0x7fffffffb1f8,0x2,0x7fffffffb220,0x7fffffffb200,0x0,0x0) = 0 (0x0)
>> gettimeofday({1362819606.123684 },0x0)           = 0 (0x0)
>> getpid()                                         = 3235 (0xca3)
>> issetugid(0x35001c1c,0x80,0x801b1b600,0x10,0x2,0x1) = 0 (0x0)
>> open("/etc/resolv.conf",O_RDONLY,0666)           = 4 (0x4)
>> fstat(4,{ mode=-rw-r--r-- ,inode=117845,size=101,blksize=16384 }) = 0 (0x0)
>> read(4,"# Generated by resolvconf\nnames"...,16384) = 101 (0x65)
>> read(4,0x813928000,16384)                        = 0 (0x0)
>> close(4)                                         = 0 (0x0)
>> __sysctl(0x7fffffffab28,0x2,0x7fffffffad20,0x7fffffffab30,0x0,0x0) = 0 (0x0)
>> issetugid(0x801526ae8,0x2e,0x2e,0x2e,0x101010101010101,0x8080808080808080)
>> = 0 (0x0)
>> stat("/etc/nsswitch.conf",{ mode=-rw-r--r--
>> ,inode=117790,size=991,blksize=16384 }) = 0 (0x0)
>> open("/etc/hosts",O_RDONLY,0666)                 = 4 (0x4)
>> fstat(4,{ mode=-rw-r--r-- ,inode=117862,size=2418,blksize=16384 }) = 0 (0x0)
>> read(4,"# $FreeBSD: head/etc/hosts 10999"...,16384) = 2418 (0x972)
>> close(4)                                         = 0 (0x0)
>> open("/usr/local/etc/openldap/ldap.conf",O_RDONLY,0666) = 4 (0x4)
>> fstat(4,{ mode=-rw-r--r-- ,inode=5817420,size=410,blksize=16384 }) = 0 (0x0)
>> read(4,"#\n# LDAP Defaults\n#\n\n# See l"...,16384) = 410 (0x19a)
>> read(4,0x813928000,16384)                        = 0 (0x0)
>> close(4)                                         = 0 (0x0)
>> geteuid()                                        = 2002 (0x7d2)
>> getuid()                                         = 2002 (0x7d2)
>> open("/home/ohartmann/ldaprc",O_RDONLY,0666)     ERR#2 'No such file or
>> directory'
>> open("/home/ohartmann/.ldaprc",O_RDONLY,0666)    ERR#2 'No such file or
>> directory'
>> open("ldaprc",O_RDONLY,0666)                     ERR#2 'No such file or
>> directory'
>> sigprocmask(SIG_SETMASK,SIGHUP|SIGINT|SIGQUIT|SIGILL|SIGTRAP|SIGABRT|SIGEMT|SIGFPE|SIGKILL|SIGBUS|SIGSEGV|SIGSYS|SIGPIPE|SIGALRM|SIGTERM|SIGURG|SIGSTOP|SIGTSTP|SIGCONT|SIGCHLD|SIGTTIN|SIGTTOU|SIGIO|SIGXCPU|SIGXFSZ|SIGVTALRM|SIGPROF|SIGWINCH|SIGINFO|SIGUSR1|SIGUSR2,0x0)
>> = 0 (0x0)
>> sigaction(SIGPIPE,{ SIG_IGN SA_RESTART ss_t },{ SIG_IGN 0x0 ss_t }) = 0
>> (0x0)
>> sigprocmask(SIG_SETMASK,0x0,0x0)                 = 0 (0x0)
>> getuid()                                         = 2002 (0x7d2)
>> stat("/etc/nsswitch.conf",{ mode=-rw-r--r--
>> ,inode=117790,size=991,blksize=16384 }) = 0 (0x0)
>> geteuid()                                        = 2002 (0x7d2)
>> open("/etc/pwd.db",O_RDONLY,00)                  = 4 (0x4)
>> fcntl(4,F_SETFD,FD_CLOEXEC)                      = 0 (0x0)
>> fstat(4,{ mode=-rw-r--r-- ,inode=117927,size=40960,blksize=16384 }) = 0
>> (0x0)
>> read(4,"\0\^F\^Ua\0\0\0\^B\0\0\^D\M-R\0"...,260) = 260 (0x104)
>> pread(0x4,0x813928000,0x1000,0x6000,0x1,0x0)     = 4096 (0x1000)
>> pread(0x4,0x813929000,0x1000,0x5000,0x1,0x0)     = 4096 (0x1000)
>> close(4)                                         = 0 (0x0)
>> socket(PF_LOCAL,SOCK_STREAM,0)                   = 4 (0x4)
>> connect(4,{ AF_UNIX "/var/run/nscd" },15)        ERR#2 'No such file or
>> directory'
>> close(4)                                         = 0 (0x0)
>> sigprocmask(SIG_SETMASK,SIGHUP|SIGINT|SIGQUIT|SIGILL|SIGTRAP|SIGABRT|SIGEMT|SIGFPE|SIGKILL|SIGBUS|SIGSEGV|SIGSYS|SIGPIPE|SIGALRM|SIGTERM|SIGURG|SIGSTOP|SIGTSTP|SIGCONT|SIGCHLD|SIGTTIN|SIGTTOU|SIGIO|SIGXCPU|SIGXFSZ|SIGVTALRM|SIGPROF|SIGWINCH|SIGINFO|SIGUSR1|SIGUSR2,0x0)
>> = 0 (0x0)
>> sigaction(SIGPIPE,{ SIG_IGN 0x0 ss_t },{ SIG_IGN SA_RESTART ss_t }) = 0
>> (0x0)
>> sigprocmask(SIG_SETMASK,0x0,0x0)                 = 0 (0x0)
>> stat("/usr/local/etc/nss_ldap.conf",{ mode=-rw-r--r--
>> ,inode=5818085,size=7997,blksize=16384 }) = 0 (0x0)
>> getpid()                                         = 3235 (0xca3)
>> geteuid()                                        = 2002 (0x7d2)
>> SIGNAL 11 (SIGSEGV)
>> process exit, rval = 0
> 
> Deleting /usr/local/etc/nss_ldap.conf, which is a link (hard or soft,
> doesn't matter the result) to /usr/local/etc/ldap.conf, makes
> Thunderbird start again as OpenLDAP backend wasn't configured/installed.
> 
> But in that case, no OpenLDAP backed up users are available on the system.SE556539368201

Not 100% sure but I believe I'm working right now on a system with
LDAP-based user accounts ( a Samba LDAP directory ) through pam_ldap (in
pam.d), nss_ldap (nsswitch.conf) and /usr/local/etc/nss_ldap.conf
exactly as you describe.

Never had issues similar to the above in the 7-STABLE through 9-STABLE
series. The only problem I have with TB is its apetite for memory.

Perhaps I'm missing something? May the difference be that my account is
in /etc/passwd too? I could log in as a different user and check if
you'd like.

id peo
uid=1001(peo) gid=0(wheel) groups=0(wheel),513(domusers),512(domadmin)

Cheers,

//per
Received on Sat Mar 09 2013 - 21:21:52 UTC

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