[Pdns-users] Issue with communications hanging, version 2.9.17-13sarge1

[bert hubert]

Dave - I'm looking in to this, thanks for your stunning debugging detail.

Could you in the mean time tell me where you got the powerdns binary from,
did you compile it yourself, of so, which gcc, which operating system, which
version etc.

I'm confident we'll find the solution with this much data.

On Thu, Oct 20, 2005 at 04:35:29PM -0400, Dave Taylor wrote:
>  
> Following is more information that may be relevant to the issue that we are
> experiencing.
> 
> The process that checks for slave domains that need to be refreshed
> (CommunicatorClass::slaveRefresh()) seems to just stop working after a
> certain period of time.
> 
> An strace -p on this process shows the following over and over when working:
> 
> recvfrom(11, 0xbf5ff364, 1500, 0, 0xbf5ff944, 0xbf5ff204) = -1 EAGAIN
> (Resource temporarily unavailable)
> time(NULL)                              = 1129831123
> time(NULL)                              = 1129831123
> rt_sigprocmask(SIG_BLOCK, [CHLD], [RTMIN], 8) = 0
> rt_sigaction(SIGCHLD, NULL, {SIG_DFL}, 8) = 0
> rt_sigprocmask(SIG_SETMASK, [RTMIN], NULL, 8) = 0
> nanosleep({1, 0}, {1, 0})
> 
> But only shows this when it has stopped working (1 time, not over and over):
> 
> recvfrom(11, 
> (the file descriptor for socket 11 shows: "pdns_serv 19540    pdns   11u
> IPv4     912515                   UDP *:10006")
> 
> And that is it.  I can still force a retrieve with pdns_control and the
> command will return, but nothing happens.  
> 
> 
> When it's working properly, pdns will 
> 1) make it's connection to the mysql db
> 2) make a connection to the master server of the slave zone (as shown here
> in the strace)
> 
> socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 16
> fcntl64(16, F_GETFL)                    = 0x2 (flags O_RDWR)
> fcntl64(16, F_SETFL, O_RDWR|O_NONBLOCK) = 0
> connect(16, {sa_family=AF_INET, sin_port=htons(53),
> sin_addr=inet_addr("x.x.x.x")}, 16) = -1 EINPROGRESS (Operation now in
> progress)
> select(17, [16], [16], NULL, {10, 0})   = 1 (out [16], left {10, 0})
> getsockopt(16, SOL_SOCKET, SO_ERROR, [0], [4]) = 0
> fcntl64(16, F_GETFL)                    = 0x802 (flags O_RDWR|O_NONBLOCK)
> fcntl64(16, F_SETFL, O_RDWR)            = 0
> writev(16, [{"\0\33", 2},
> {"\16\351\0\0\0\1\0\0\0\0\0\0\00510nbc\3com\0\0\374\0\1", 27}], 2) = 29
>  * 2 bytes in buffer 0
>  | 00000  00 1b                                             ..
> |
>  * 27 bytes in buffer 1
>  | 00000  0e e9 00 00 00 01 00 00  00 00 00 00 05 31 30 6e  ........
> .....10n |
>  | 00010  62 63 03 63 6f 6d 00 00  fc 00 01                 bc.com.. ...
> |
> select(17, [16], NULL, NULL, {10, 0})   = 1 (in [16], left {9, 990000})
> 
> 3) query the local DB for the zone information.
> 4) query the master for it's information.
> 5) compare info and update as needed.
> 
> When this isn't working, step 2 above is not happening and therefore steps 4
> and 5 never happen.  It simply shuts down the mysql connection and closes.
> 
> I realize that this is what is happening after it has already stopped
> working.  I have not been able to pinpoint what might be making it stop
> working.
> 
> Is there other information that may be helpful in figuring this out?  I
> would be glad to gather more info, but I'm not 100% sure of where to go from
> here.
> 
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> 
> 
> !DSPAM:435800ce47569336612167!

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