netdev - RE: SCTP seems to lose its socket state.

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6D1725C172@AcuExch.aculab.com>
Date:	Fri, 13 Jun 2014 10:53:13 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Vlad Yasevich' <vyasevich@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: SCTP seems to lose its socket state.

From: Vlad Yasevich 
> Can you try the attached patch and let me know if it solves this problem
> for you.

I've finally got around to trying it, and then fighting grub2 to get a
serial console (after finding a COM header and cables).
(Why can't I configure two entries for the same kernel, with and without
the serial console...)

As soon as the COOKIE_ECHO is received I get:

[   65.756811] kernel BUG at /home/dsl/linux/net/sctp/command.c:50!

It has hit the limit for SCTP_MAX_NUM_COMMANDS.
I increased it to 20 and traced the entries when the exceeded
the old limit (of 14).

[  102.250614] sctp_add_cmd_sf: seq  0, 36(          (null))
[  102.266575] sctp_add_cmd_sf: seq  1, 15(0000000000000008)
[  102.282500] sctp_add_cmd_sf: seq  2, 2b(          (null))
[  102.298426] sctp_add_cmd_sf: seq  3, 15(0000000000000005)
[  102.314352] sctp_add_cmd_sf: seq  4, 40(          (null))
[  102.330279] sctp_add_cmd_sf: seq  5, 2a(ffff88022f3b4000)
[  102.346206] sctp_add_cmd_sf: seq  6,  b(ffff8800bc4df128)
[  102.361874] sctp_add_cmd_sf: seq  7,  c(ffff8800bc4de800)
[  102.377540] sctp_add_cmd_sf: seq  8, 2c(ffff8800bc4df000)
[  102.393470] sctp_add_cmd_sf: seq  9, 12(0000000000000003)
[  102.409397] sctp_add_cmd_sf: seq 10, 14(0000000000000006)
[  102.425583] sctp_add_cmd_sf: seq 11,  3(0000000000000005)
[  102.441510] sctp_add_cmd_sf: seq 12, 20(          (null))
[  102.457699] sctp_add_cmd_sf: seq 13,  c(ffff8800bc4df000)
[  102.521433] sctp_add_cmd_sf: seq 14, 41(ffff88022f3b4000)
[  102.538658] sctp_add_cmd_sf: seq 15,  2(          (null))
[  102.555626] sctp_add_cmd_sf: seq 16, 41(ffff88023525e000)

I've not tried to see what these are.

tcpdump then shows it sending a shutdown bundled with the cookie ack
and the disconnect completes.

	David




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