Re: kernel BUG at include/net/tcp.h:739

From: "Ilpo_Järvinen" <redacted>
Date: Thu, 3 May 2007 09:51:36 +0300 (EEST)

[PATCH] [TCP]: Use S+L catcher only with SACK for now

TCP has a transitional state when SACK is not in use during
which this invariant is temporarily broken. Without SACK,
tcp_clean_rtx_queue does not decrement sacked_out. Therefore
calls to tcp_sync_left_out before sacked_out is again
corrected by tcp_fastretrans_alert can trigger this trap as
sacked_out still has couple of segments that are already out
of window.

Signed-off-by: Ilpo Järvinen <redacted>

It would be nice to fix non-SACK as you say, but this is good
enough for now.