Rsync maintainers please review rsync bug
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=98740
The code in question is in socket.c in start_accept_loop.
The user is getting these warning messages:
-----------------------------
Jul 8 12:56:59 ftp kernel: application bug: rsync(1051) has SIGCHLD set to
SIG_IGN but calls wait().
Jul 8 12:56:59 ftp kernel: (see the NOTES section of 'man 2 wait'). Workaround
activated.
-----------------------------
I was able to reproduce that error with rsync server and
client on Red Hat OS's on a fairly consistent basis by
running an rsync server (rsync version 2.5.6 protocol
version 27 from cvs 7/14) from the command line
(rsync --daemon), and connecting with an rsync-2.4.6
client with this command:
rsync -avv my.server.com::test/one /tmp/rsync_test
I also produced the same error by using the same command
from an rsync-2.5.6 protocol version 26 client.
Here is my /etc/rsyncd.conf file:
-----------------------------
log file = /var/log/rsync
[test]
uid = rsync1
gid = rsync1
path = /rsync_test
comment = Rsync Test - Comment
-----------------------------
Quoting one of the bug messages,
"These messages are a warning that rsync is not
standards compliant with respect to its handling
of child processes. According to POSIX (3.3.1.3)
it is unspecified what happens when SIGCHLD is set
to SIG_IGN."
This code in socket.c:
-----------------------------
signal(SIGCHLD, SIG_IGN);
/* we shouldn't have any children left hanging around
but I have had reports that on Digital Unix zombies
are produced, so this ensures that they are reaped */
#ifdef WNOHANG
while (waitpid(-1, NULL, WNOHANG) > 0);
#endif
-----------------------------
sets SIGCHLD to SIG_IGN, and *then* waits if WNOHANG is
defined. It would appear that if there are still children
left to be cleaned up in Digital Unix after setting SIGCHLD
to SIG_IGN, that there might be a bug in Digital Unix that
rsync is coding a fix for.
One coding change could be to change the #ifdef WNOHANG to
a #ifdef <Digital Unix string>, so that only Digital Unix
OS's would include and execute the waitpid. This would
stop warning messages from being produced.
Thanks.
--
Hardy Merrill
Red Hat, Inc.
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