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Re: [Freeipmi-users] ipmiconsole: "could not set errnum: current = 31, d

From: David O'Shea
Subject: Re: [Freeipmi-users] ipmiconsole: "could not set errnum: current = 31, desired = 25"
Date: Tue, 12 Aug 2014 10:11:44 +1000

Hi Al,

Thanks for the response, please see below:

> Subject: Re: [Freeipmi-users] ipmiconsole: "could not set errnum: current =   
> 31, desired = 25"
> From: address@hidden
> To: address@hidden
> CC: address@hidden
> Date: Mon, 11 Aug 2014 16:24:00 -0700
> Hi David,
> > (ipmiconsole_processing.c, _sol_bmc_to_remote_console_packet, 2801):
> >; protocol_state=9h: scbuf_write:
> > dropped data: dropped=14
> > (ipmiconsole_processing.c, _process_ctx, 4005):
> >; protocol_state=Ah: closing
> > session due to session timeout
> > (ipmiconsole_ctx.c, ipmiconsole_ctx_set_errnum, 1396): could not set
> > errnum: current = 31, desired = 25
> Interesting, it appears that the buffer (scbuf_write) overflowed its
> max, which is defaulted to 16K.  That's what likely caused the internal
> error.  I guess there was a ton of data coming out.  It's possible if
> the buffer were increased you may not see the problem anymore.  The max
> was picked along time ago and perhaps BMCs are simply able to pump out
> more data than they used to.

I assume this is the CONSOLE_BMC_TO_REMOTE_CONSOLE_BUF_MAX definition, and I'd 
have to recompile to override this?

Could the problem be that I'm not reading from the file descriptor fast enough? 
 I have the FD set to non-blocking mode and I have a thread that basically just 
reads up to 2K from the FD, and if it times out it sleeps for ~10ms and tries 
again, otherwise it does a bit of processing and then writes the data to a pipe 
to another thread, I suppose the write to the pipe could be block if the other 
thread is too slow or something.

> > Am I using libipmiconsole incorrectly if I'm just reading from the file 
> > descriptor waiting for EOF to indicate an error?
> Nope, that's correct usage.  Your situation is admittedly unique.  Is
> this something that can't be programmed around?  Or is this more just a
> "interesting thing that happened."

I can't really program around it reliably - I could add some logic to reconnect 
if I lose the connection, but if the message I'm waiting for happened to appear 
while I was disconnected, that would be bad.

> The output you show above it the kind of debugging output you should
> see.  The INTERNAL_ERROR was likely caused by the
> _sol_bmc_to_remote_console_packet message.

Ahh ok thanks.

Perhaps I should mention some other details now in case they are relevant: my 
second thread acts a bit like 'expect' - waits for a message, writes a 
response/command to the libipmiconsole file descriptor, waits for the next 
message, etc.  I found that if I tried to do 4K reads from the FD in the first 
thread, whilst the write calls in the second thread did (if I recall correctly) 
return, I didn't get the expected responses coming back from the iDRAC in the 
read thread.  I didn't dig any deeper since things generally seem to be okay 
with 2K reads.


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