Re: Tunnel collapses with "Bad file descriptor"

Hello Mark,

I'm very doubtful about the version difference is causing those
problems. I've had different versions running without any problems.
Besides that portion of the code should not have anything to do
with the other end.

Mike's posting below on the otherhand is totally valid. I've also
had cipe daemons stopping because of EINTRs occuring there on
fedora kernels. Moreover, Mike's fix seems valid and I haven't
experienced a single problem after that fix.

I've made a cipe-1.4.5-19 rpm for fedora that incorporates that fix at :
http://www.hut.fi/u/tkyntola/linux/

However, what you described was a EBADF in the same place, which is
really strange. You might still want to try it with that fix included
to rule out the possiblity of a wrong error message being printed there.
Because I cannot see how the fd for /dev/urandom could get closed or
corrupted.

cheers,
	Tommi "Kynde" Kyntola		[email protected]

> I just noticed that the two tunnel ends where running different versions of
> cipe.
> One had 1.4.5-18 (Fedora/RedHat), the other had 1.4.5-16 (Fedora/RedHat).
> Could this have been the reason for the problems?
> 
> Thanks,
> 
> MARK
> 
> 
> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On Behalf Of
> Michael Fischer
> Sent: Sunday, April 18, 2004 3:27 PM
> To: Mark
> Cc: [email protected]
> Subject: Re: Tunnel collapses with "Bad file descriptor"
> 
> 
> Dear Mark,
> 
> I've had problems in the past with my cipe daemon dying at this same
> spot in the code, but I got the error "Interrupted system call", which
> can happen normally during a blocking read and is not handled properly
> by the cipe code.  (See ciped.c in the source around the line that
> contains the text "kxchg: read(r)".)  What that code is trying to do is
> to get some random bits from /dev/urandom.  /dev/urandom is opened by
> main().  Its file descriptor is passed to mainloop() as the third
> argument and is in turn passed to kxchg(), which generates the observed
> error message.  The return from the original open() call is checked for
> validity, so it isn't at all clear why the read() call in kxchg() finds
> the descriptor bad.  Perhaps /dev/urandom is somehow getting closed, or
> the descriptor is getting corrupted, or an incorrect error message is
> getting logged and you're really encountering the same problem that I was.
> 
> You can find my old posting about the "Interrupted system call" error on
> the cipe-l archives at
> http://sites.inka.de/bigred/archive/cipe-l/2003-12/msg00003.html
> Good luck at tracking this one down!
> 
> --Mike
> 
> Mark wrote:
> 
> 
>>Hi,
>>
>>I have a cipe (v.1.4.5) tunnel running between a Redhat9 and a Fedora
>>core 1 machine. The tunnel gets established successfully and works fine
>>until at some point - sometimes after a few hours, sometimes after a
>>few days - it collapses with this error message:
>>
>>Apr 14 19:22:50 lvd1 ciped-cb[2658]: kxchg: read(r): Bad file descriptor
>>Apr 14 19:22:50 lvd1 ciped-cb[2658]: Interface stats 22552096  201358    4
>>0    0     1          0         0        0
>>      0    0    0    0     0       0          0
>>Apr 14 19:22:50 lvd1 ciped-cb[2658]: KX stats: rreq=0, req=335,
>>ind=336, indb=0, ack=328, ackb=0, unknown=0 Apr 14 19:22:50 lvd1
>>ciped-cb[2658]:
>>cipcb1: daemon exiting
>>
>>Any idea where this might come from?
>>The machines are sitting locally within a LAN - it's just a test setup
>>for now...
>>
>>Thanks,
>>
>>MARK
>>
>>
>>--
>>Message sent by the [email protected] mailing list.
>>Unsubscribe: mail [email protected], "unsubscribe cipe-l" in body Other
>>commands available with "help" in body to the same address. CIPE info
>>and list archive: <URL:http://sites.inka.de/~bigred/devel/cipe.html
>>
> 
> 
> --
> Message sent by the [email protected] mailing list.
> Unsubscribe: mail [email protected], "unsubscribe cipe-l" in body Other
> commands available with "help" in body to the same address. CIPE info and
> list archive: <URL:http://sites.inka.de/~bigred/devel/cipe.html>
> 
> 
> --
> Message sent by the [email protected] mailing list.
> Unsubscribe: mail [email protected], "unsubscribe cipe-l" in body
> Other commands available with "help" in body to the same address.
>  CIPE info and list archive:
>  <URL:http://sites.inka.de/~bigred/devel/cipe.html>
> 


--
Message sent by the [email protected] mailing list.
Unsubscribe: mail [email protected], "unsubscribe cipe-l" in body
Other commands available with "help" in body to the same address.
CIPE info and list archive: <URL:http://sites.inka.de/~bigred/devel/cipe.html>