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+++ This bug was initially created as a clone of Bug #1670028 +++
The Linux kernel does not forward certain ICMP errors to userspace unless IP_RECVERR/IPV6_RECVERR is specified. We should use this socket option in the DNS stub resolver, as suggested in the upstream bug.
Upstream commit:
commit 08504de71813ddbd447bfbca4a325cbe8ce8bcda
Author: Florian Weimer <fweimer>
Date: Tue Mar 12 11:40:47 2019 +0100
resolv: Enable full ICMP errors for UDP DNS sockets [BZ #24047]
The Linux kernel suppresses some ICMP error messages by default for
UDP sockets. This commit enables full ICMP error reporting,
hopefully resulting in faster failover to working name servers.
Hurd-specific follow-on fix (optional):
commit 043440e761d395e1f507d9faa6e82b3fe4536c3f
Author: Florian Weimer <fweimer>
Date: Wed Mar 13 14:58:58 2019 +0100
hurd: Add no-op version of __res_enable_icmp [BZ #24047]
Mach does not support IP_RECVERR, so replace this function with a
stub in a sysdeps override for Hurd.
This fixes commit 08504de71813ddbd447bfbca4a325cbe8ce8bcda
("resolv: Enable full ICMP errors for UDP DNS sockets [BZ #24047]").
For verification, I think it is sufficient to check that strace shows the additional setsockopt call.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHSA-2019:3513