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Date: Sat, 14 Jun 1997 17:34:24 -0700 (PDT)
From: Tom Samplonius <tom@sdf.com>
To: "Serge A. Babkin" <babkin@hq.icb.chel.su>
cc: hackers@freebsd.org
Subject: Re: C optimizer bug ?
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On Sun, 15 Jun 1997, Serge A. Babkin wrote:

> Hi!
> 
> I have discovered a problem. It is in the more-than-a-year-old-home-made-
> snapshot but there are some signs that it may continue upto now.
> 
> I'm trying to implement a SCSI-over-FastEthernet extender. First
> I built a model with SCSI card emulator (based on NCR53c810
> driver because I plan to use these cards) and Ethernet card
> emulator. Everything works fine. In the last week I
> finally received the FastEthernet cards and started to use it. 
> Everything worked fine but only while tcpdump was running or
> the printf() debugging messages enabled. If not then the process
> hanged after several transmission inside the generic SCSI driver.
> I tried everything and finally decided to build the kernel
> without the optimization. Everything started working fine!
> So the C optimizer seems like having a bug.
> 
> Now about why I think that it may continue upto now. In March I tried
> to convert to a newer version of FreeBSD but my SCSI converter
> got lots of panics with all the kernel starting from about May '96
> so I decided to return back.
> 
> -SB


  I guess you are using -current from a year ago?  Wasn't gcc upgraded to
2.7.2.1 since then?  What gcc version is in your snapshot?  Try "gcc -v".

Tom