@jon.grimm I can reproduce after I set up LDAP server and client to use StartTLS. In plain setup, no write to non-connected socket is issued in the atfork handlers of child process, so no SIGPIPE is raised.
On Wed, Aug 26, 2015 at 7:45 PM, Jon Grimm <jon.gr...@canonical.com> wrote: > @brianquigley, Thanks for responding. Indeed, may have to wait unless I > can find someone that can reproduce and/or speak to impacting them > rather than theoretical. > > FWIW, debian sid has 265.. and does not have a patch with the fix yet > either. > > -- > You received this bug notification because you are subscribed to the bug > report. > https://bugs.launchpad.net/bugs/1397250 > > Title: > SIGPIPE not caught in do_atfork_child() > > Status in nss_ldap: > Fix Released > Status in libnss-ldap package in Ubuntu: > Triaged > > Bug description: > Ubuntu version: Ubuntu 14.04.1 LTS > Package version: libnss-ldap_264-2.2ubuntu4 > > If a process using libnss-ldap calls fork() and SIGPIPE was blocked, the > atfork() handler in the child process failed to catch the SIGPIPE as it was > supposed to do, that is in the call to do_close_no_unbind(). So that, the > uncaught SIGPIPE will be eventually > delivered when the child unblocks signals. This usually make the child > process die unexpectedly. > > I found a well-known Linux vendor fixed this issue with the following > patch. This unblocks the SIGPIPE before calling do_close_no_unbind() > and restores the original sigmask afterwards: > > diff -up nss_ldap/ldap-nss.c nss_ldap/ldap-nss.c > --- nss_ldap/ldap-nss.c 2009-12-07 20:57:33.000000000 -0500 > +++ nss_ldap/ldap-nss.c 2009-12-07 20:58:56.000000000 -0500 > @@ -532,8 +532,13 @@ > static void > do_atfork_child (void) > { > + sigset_t unblock, mask; > debug ("==> do_atfork_child"); > + sigemptyset(&unblock); > + sigaddset(&unblock, SIGPIPE); > + sigprocmask(SIG_UNBLOCK, &unblock, &mask); > do_close_no_unbind (); > + sigprocmask(SIG_SETMASK, &mask, NULL); > _nss_ldap_leave (); > debug ("<== do_atfork_child"); > } > > I'd like to see this patch applied. > > To manage notifications about this bug go to: > https://bugs.launchpad.net/nss-ldap/+bug/1397250/+subscriptions -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/1397250 Title: SIGPIPE not caught in do_atfork_child() To manage notifications about this bug go to: https://bugs.launchpad.net/nss-ldap/+bug/1397250/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
