Hey Basil,
Good to hear from you.. hope all is well.
Yes.. it's been reported and Thomas verified it but I haven't heard of
any fixes yet ( I did send out a prod last month but no response)
--David
KI6ZHD
-------- Forwarded Message --------
Subject: Re: AX.25 / ax25d socket close issue on Ubuntu 14.04 but not
on 12.04
Date: Tue, 29 Mar 2016 09:00:37 +0200
From: Thomas Osterried <thomas@de>
To: David Ranch <dranch@net>
CC: Ralf Bächle DL5RB <ralf@org>, Bernard, f6bvp <f6bvp@fr>
Am 28.03.2016 um 22:21 schrieb David Ranch <dranch@net>:
Hey Ralf, Thomas, Bernard,
I've been helping a user here who is running the LinuxRMS gateway on his Ubuntu
14.04 machine and when the remote station terminates the session, it leaves an
AX.25 session on his computer *forever*.. never times out:
Active AX.25 sockets
Dest Source Device State Vr/Vs Send-Q Recv-Q
WA7FPV-0 WA7FPV-10 ax0 LISTENING 001/003 0 0
He built up an Ubuntu 12.04 machine with the same LinuxRMS/ax25d service and
this does NOT happen. He then sent me the below strace. Any thoughts on where
this issue is coming from?
Hello David,
just for a quick answer (I'm on journey): it's coming from a kernel bug in the
ax25 part.
You already have Cc'ed Ralf <dl5rb>.
If I remember correctly, he spoke some weeks ago also about this issue.
I also know of those problems, which are very rare.
My question is: does it happen on SMP (multiprocessor-machine)?
vy 73,
- Thomas dl9sau
--David
-------- Forwarded Message --------
Subject: Re: AX.25 Help...
Date: Mon, 28 Mar 2016 12:52:25 -0700
From: Josh Gibbs <gibbsjj@com>
To: David Ranch <dranch@net>
Confirmed that starting Direwolf on the Ubuntu 14 box with your script made no
difference. Socket still hangs up. I connected to the rmsgw process with
strace, and then sent the bye command:
select(5, [0 4], NULL, NULL, NULL) = 1 (in [0])
read(0, "b\r", 8192) = 2
write(4, "b\r", 2) = 2
read(0, 0x8058180, 8192) = -1 EAGAIN (Resource temporarily
unavailable)
select(5, [0 4], NULL, NULL, NULL) = 1 (in [4])
recv(4, "D", 1, MSG_PEEK|MSG_DONTWAIT) = 1
recv(4, "Disconnecting...\r", 8192, 0) = 17
write(1, "Disconnecting...\r", 17) = 17
recv(4, 0x8058180, 8192, 0) = -1 EAGAIN (Resource temporarily
unavailable)
select(5, [0 4], NULL, NULL, NULL) = 1 (in [4])
recv(4, "", 1, MSG_PEEK|MSG_DONTWAIT) = 0
time(NULL) = 1459193715
send(3, "<134>Mar 28 12:35:15 rmsgw[1417]"..., 85, MSG_NOSIGNAL) = 85
write(1, "; INFO: Connection closed by CMS"..., 51) = 51
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_IGN, [], 0}, 8) = 0
nanosleep({1, 0}, 0xbfad3bac) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
close(4) = 0
time(NULL) = 1459193716
write(1, "; Sent: 81 Bytes / Received: 2 B"..., 61) = 61
write(1, "; W7AUX de WA7FPV-10 SK\n", 24) = 24
time(NULL) = 1459193716
time(NULL) = 1459193716
send(3, "<133>Mar 28 12:35:16 rmsgw[1417]"..., 84, MSG_NOSIGNAL) = 84
close(4) = -1 EBADF (Bad file descriptor)
exit_group(0) = ?
+++ exited with 0 +++
I'm thinking that close(4) near the end is supposed to close the socket, but is
resulting in -1 EBADF (Bad file descriptor).
I'm going to have a look in the code when I have more time to poke at this, but
for now I at least have a working RMS Gateway on the Ubuntu 12 box! Appreciate
all your help with this. I will let you know when I get to the root of it all,
if you are interested!
-Josh
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