Public bug reported: On hirsute, on Jan 20, postfix stopped sending outgoing mails with the error
Feb 22 23:35:18 pccross postfix/smtp[9582]: fatal: unknown service: smtp/tcp There were no changes in the system other than daily upgrades. Strace shows that `smtp` process (while chrooted), after successful open of the file in the queue, tried to use NSS, ran `fstat()` against `/etc/nsswitch.conf`, that succeeded (presumably using the copy in the /var/spool/postfix/etc/ directory), but there was no subsequent `open()`, and the next syscall is `sendto()` of the error message to syslog. There was a big upgrade between the last successful and the first unsuccessful email delivery, and among other things libc was updated from 2.32-0ubuntu6 to 2.33-0ubuntu2. I suspect that there was some change in the NSS in libc that resulted in the failure of `getservbyname()`. Is anybody else observing this problem? ProblemType: Bug DistroRelease: Ubuntu 21.04 Package: postfix 3.5.6-1 ProcVersionSignature: Ubuntu 5.10.0-14.15-generic 5.10.11 Uname: Linux 5.10.0-14-generic x86_64 ApportVersion: 2.20.11-0ubuntu59 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: X-Cinnamon Date: Tue Feb 23 00:02:13 2021 EtcMailname: pccross.average.org Hostname: pccross PostconfMydomain: localdomain PostconfMyhostname: pccross.localdomain PostconfMyorigin: /etc/mailname ResolvConf: # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) # DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN nameserver 127.0.0.1 search average.org SourcePackage: postfix UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: postfix (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug hirsute hirsute-regression third-party-packages ** Description changed: On hirsute, on Jan 20, postfix stopped sending outgoing mails with the error Feb 22 23:35:18 pccross postfix/smtp[9582]: fatal: unknown service: smtp/tcp There were no changes in the system other than daily upgrades. Strace shows that `smtp` process (while chrooted), after successful open of the file in the queue, tried to use NSS, ran `fstat()` against `/etc/nsswitch.conf`, that succeeded (presumably using the copy in the - /var/spool/postfix/etc/ directory), but did there was no subsequent - read, and the next syscall is `sendto()` of the error message to syslog. + /var/spool/postfix/etc/ directory), but there was no subsequent + `open()`, and the next syscall is `sendto()` of the error message to + syslog. There was a big upgrade between the last successful and the first unsuccessful email delivery, and among other things libc was updated from 2.32-0ubuntu6 to 2.33-0ubuntu2. I suspect that there was some change in the NSS in libc that resulted in the failure of `getservbyname()`. Is anybody else observing this problem? ProblemType: Bug DistroRelease: Ubuntu 21.04 Package: postfix 3.5.6-1 ProcVersionSignature: Ubuntu 5.10.0-14.15-generic 5.10.11 Uname: Linux 5.10.0-14-generic x86_64 ApportVersion: 2.20.11-0ubuntu59 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: X-Cinnamon Date: Tue Feb 23 00:02:13 2021 EtcMailname: pccross.average.org Hostname: pccross PostconfMydomain: localdomain PostconfMyhostname: pccross.localdomain PostconfMyorigin: /etc/mailname ResolvConf: - # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) - # DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN - - nameserver 127.0.0.1 - search average.org + # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) + # DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN + + nameserver 127.0.0.1 + search average.org SourcePackage: postfix UpgradeStatus: No upgrade log present (probably fresh install) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1916541 Title: smtp "fatal: unknown service: smtp/tcp", probably after libc upgrade To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/postfix/+bug/1916541/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs