Package: nagstamon
Version: 0.9.4-1
Severity: normal
When stracing nagstamon to attempt to work out why I'm seeing the "ERROR:
please check settings/network" message (there were no issues with the
servers or network at the time), I noticed a broken attempt at DNS
resolution:
write(6, "A", 1) = 1
futex(0x23aaa18, FUTEX_WAIT_PRIVATE, 2, NULL) = 0
futex(0x23aaa18, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x291e9d0, FUTEX_WAKE_PRIVATE, 1) = 1
select(0, NULL, NULL, NULL, {5, 0}) = 0 (Timeout)
select(0, NULL, NULL, NULL, {5, 0}) = 0 (Timeout)
select(0, NULL, NULL, NULL, {10, 0}) = 0 (Timeout)
socket(PF_NETLINK, SOCK_RAW, 0) = 11
bind(11, {sa_family=AF_NETLINK, pid=0, groups=00000000}, 12) = 0
getsockname(11, {sa_family=AF_NETLINK, pid=3056, groups=00000000}, [12]) = 0
sendto(11, "\24\0\0\0\26\0\1\3\3756\254L\0\0\0\0\0\0\0\0", 20, 0,
{sa_family=AF_NETLINK, pid=0, groups=00000000}, 12) = 20
recvmsg(11, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000},
msg_iov(1)=[{"0\0\0\0\24\0\2\0\3756\254L\360\v\0\0\2\10\200\376\1\0\0\0\10\0\1\0\177\0\0\1"...,
4096}], msg_controllen=0, msg_flags=0}, 0) = 108
recvmsg(11, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000},
msg_iov(1)=[{"@\0\0\0\24\0\2\0\3756\254L\360\v\0\0\n\200\200\376\1\0\0\0\24\0\1\0\0\0\0\0"...,
4096}], msg_controllen=0, msg_flags=0}, 0) = 128
recvmsg(11, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000},
msg_iov(1)=[{"\24\0\0\0\3\0\2\0\3756\254L\360\v\0\0\0\0\0\0\1\0\0\0\24\0\1\0\0\0\0\0"...,
4096}], msg_controllen=0, msg_flags=0}, 0) = 20
close(11) = 0
stat("/etc/resolv.conf", {st_mode=S_IFREG|0644, st_size=231, ...}) = 0
open("/etc/hosts", O_RDONLY|O_CLOEXEC) = 11
fstat(11, {st_mode=S_IFREG|0644, st_size=295, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f3c2e107000
read(11, "127.0.0.1\tlocalhost\n127.0.1.1\tcr"..., 4096) = 295
read(11, "", 4096) = 0
close(11) = 0
munmap(0x7f3c2e107000, 4096) = 0
stat("/etc/resolv.conf", {st_mode=S_IFREG|0644, st_size=231, ...}) = 0
socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 11
connect(11, {sa_family=AF_INET, sin_port=htons(53),
sin_addr=inet_addr("0.0.0.0")}, 16) = 0
poll([{fd=11, events=POLLOUT}], 1, 0) = 1 ([{fd=11, revents=POLLOUT}])
sendto(11, "\6g\1\0\0\1\0\0\0\0\0\0\6nagios\010xxxxxxxx\3org"..., 37,
MSG_NOSIGNAL, NULL, 0) = 37
poll([{fd=11, events=POLLIN|POLLOUT}], 1, 5000) = 1 ([{fd=11,
revents=POLLOUT|POLLERR}])
sendto(11, "\305\21\1\0\0\1\0\0\0\0\0\0\6nagios\010xxxxxxxx\3org"..., 37,
MSG_NOSIGNAL, NULL, 0) = -1 ECONNREFUSED (Connection refused)
close(11) = 0
socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 11
connect(11, {sa_family=AF_INET, sin_port=htons(53),
sin_addr=inet_addr("0.0.0.0")}, 16) = 0
poll([{fd=11, events=POLLOUT}], 1, 0) = 1 ([{fd=11, revents=POLLOUT}])
sendto(11, "\6g\1\0\0\1\0\0\0\0\0\0\6nagios\010xxxxxxxx\3org"..., 37,
MSG_NOSIGNAL, NULL, 0) = 37
poll([{fd=11, events=POLLIN|POLLOUT}], 1, 5000) = 1 ([{fd=11,
revents=POLLOUT|POLLERR}])
sendto(11, "\305\21\1\0\0\1\0\0\0\0\0\0\6nagios\010xxxxxxxx\3org"..., 37,
MSG_NOSIGNAL, NULL, 0) = -1 ECONNREFUSED (Connection refused)
close(11) = 0
socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 11
connect(11, {sa_family=AF_INET, sin_port=htons(53),
sin_addr=inet_addr("0.0.0.0")}, 16) = 0
poll([{fd=11, events=POLLOUT}], 1, 0) = 1 ([{fd=11, revents=POLLOUT}])
sendto(11, "\320\252\1\0\0\1\0\0\0\0\0\0\6nagios\010xxxxxxxx\3org"..., 63,
MSG_NOSIGNAL, NULL, 0) = 63
poll([{fd=11, events=POLLIN|POLLOUT}], 1, 5000) = 1 ([{fd=11,
revents=POLLOUT|POLLERR}])
sendto(11, "tM\1\0\0\1\0\0\0\0\0\0\6nagios\010xxxxxxxx\3org"..., 63,
MSG_NOSIGNAL, NULL, 0) = -1 ECONNREFUSED (Connection refused)
close(11) = 0
socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 11
connect(11, {sa_family=AF_INET, sin_port=htons(53),
sin_addr=inet_addr("0.0.0.0")}, 16) = 0
poll([{fd=11, events=POLLOUT}], 1, 0) = 1 ([{fd=11, revents=POLLOUT}])
sendto(11, "\320\252\1\0\0\1\0\0\0\0\0\0\6nagios\010xxxxxxxx\3org"..., 63,
MSG_NOSIGNAL, NULL, 0) = 63
poll([{fd=11, events=POLLIN|POLLOUT}], 1, 5000) = 1 ([{fd=11,
revents=POLLOUT|POLLERR}])
sendto(11, "tM\1\0\0\1\0\0\0\0\0\0\6nagios\010xxxxxxxx\3org"..., 63,
MSG_NOSIGNAL, NULL, 0) = -1 ECONNREFUSED (Connection refused)
close(11) = 0
(I've redacted the domain name)
As you can see from the "connect" call above, nagstamon is attempting to
perform DNS resolution by connecting to the IP address "0.0.0.0", rather
than my actual DNS server (192.168.5.1).
Interestingly, the other threads which were dealing with my other two
servers had no problems resolving names:
munmap(0x7f3c2e107000, 4096) = 0
stat("/etc/resolv.conf", {st_mode=S_IFREG|0644, st_size=231, ...}) = 0
socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 11
connect(11, {sa_family=AF_INET, sin_port=htons(53),
sin_addr=inet_addr("192.168.5.1")}, 16) = 0
poll([{fd=11, events=POLLOUT}], 1, 0) = 1 ([{fd=11, revents=POLLOUT}])
sendto(11, "i\230\1\0\0\1\0\0\0\0\0\0\6secure\tcrustynet\3or"..., 41,
MSG_NOSIGNAL, NULL, 0) = 41
poll([{fd=11, events=POLLIN|POLLOUT}], 1, 5000) = 1 ([{fd=11, revents=POLLOUT}])
sendto(11, "\334\367\1\0\0\1\0\0\0\0\0\0\6secure\tcrustynet\3or"..., 41,
MSG_NOSIGNAL, NULL, 0) = 41
poll([{fd=11, events=POLLIN}], 1, 4999) = 1 ([{fd=11, revents=POLLIN}])
ioctl(11, FIONREAD, [173]) = 0
recvfrom(11, "i\230\201\200\0\1\0\2\0\4\0\0\6secure\tcrustynet\3or"..., 2048,
0, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("192.168.5.1")},
[16]) = 173
poll([{fd=11, events=POLLIN}], 1, 4997) = 1 ([{fd=11, revents=POLLIN}])
ioctl(11, FIONREAD, [102]) = 0
recvfrom(11, "\334\367\201\200\0\1\0\1\0\1\0\0\6secure\tcrustynet\3or"...,
1875, 0, {sa_family=AF_INET, sin_port=htons(53),
sin_addr=inet_addr("192.168.5.1")}, [16]) = 102
close(11) = 0
I was able to fix the problem by going into the settings, editing the server
in question (making no changes) and then saving it. This restarted the
thread that was checking that server, and all seems fine for now. I expect
it will happen again though.
I've not been able to find what triggers this.. it just seems to happen
after nagstamon has been running for a while.
-- System Information:
Debian Release: squeeze/sid
APT prefers testing
APT policy: (990, 'testing'), (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.32-5-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8) (ignored: LC_ALL
set to en_GB.UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages nagstamon depends on:
ii librsvg2-common 2.26.3-1 SAX-based renderer library for SVG
ii python 2.6.5-13 interactive high-level object-orie
ii python-eggtrayicon 2.25.3-5 Python module to display icons in
ii python-glade2 2.17.0-4 GTK+ bindings: Glade support
ii python-gtk2 2.17.0-4 Python bindings for the GTK+ widge
ii python-lxml 2.2.6-1 pythonic binding for the libxml2 a
ii python-pkg-resources 0.6.14-1 Package Discovery and Resource Acc
ii python-support 1.0.9 automated rebuilding support for P
ii sox 14.3.1-1+b1 Swiss army knife of sound processi
nagstamon recommends no packages.
nagstamon suggests no packages.
-- no debconf information
--
Chris Butler <chr...@debian.org>
GnuPG Key ID: 4096R/49E3ACD3
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