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Date:      Sat, 9 Jan 1999 23:11:10 +0200 (EET)
From:      Oleg Cherevko <olwi@icyb.kiev.ua>
To:        FreeBSD-gnats-submit@FreeBSD.ORG
Subject:   kern/9407: "make kernel" yields buggy kernel in ceratin cases (ld bug?)
Message-ID:  <199901092111.XAA16689@citadel.ncc.icyb.kiev.ua>

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>Number:         9407
>Category:       kern
>Synopsis:       "make kernel" yields buggy kernel in ceratin cases (ld bug?)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Jan  9 13:20:00 PST 1999
>Closed-Date:
>Last-Modified:
>Originator:     Oleg Cherevko
>Release:        FreeBSD 2.2.8-RELEASE i386
>Organization:
ICyb ISP
>Environment:

	Was observed on:
	FreeBSD 2.2.7-RELEASE (AMD K6-2 300MHz, 64Mb RAM)
	FreeBSD 2.2.8-RELEASE (Intel 80x486DX 33MHz, 16Mb RAM)

>Description:

	This is the most strange problem that I did encounter with FreeBSD.
	The story goes like this. I made patch for FreeBSD 2.2.8 sio driver
	that adds several nice enhancements to it (the patch is included in
	this report). I tested the new sio driver this way and that,
	and finally was about to contribute it to the FreeBSD community
	when decided to change a couple of variable names in the driver
	source code. To my sheer astonishment, this simple cosmetic operation 
	have led to unstable kernel that crashed and did silent reboot as soon
	as I tried to open sio device with "cu" and type in a few chracters.
	This was my home box (AMD K6-2 300MHz, 64Mb RAM) running 2.2.7-RELEASE.
	Sure thing, I decided that I somehow broke my new sio driver.
	I checked everything twice but the driver itself proved not to be the
	source of the problem. Then I thought that it might be some broken
	hardware, so I got to different machine (Intel 80x486DX 33MHz, 16Mb RAM)
	running 2.2.8-RELEASE, and got mostly the same result (only instead of
	rebooting silently it panicked due to page fault).
	I played with names of those ill-fated variables, and finally got the
	working driver version that becomes nonoperational as soon as you
	_change the case of three letters_ in the names of 2 sio.c variables.
	Namely, "SameIRQ" -> "Sameirq", "NeedToInitSameIRQ" -> "NeedToInitSameirq"
	Yes, folks, I know that all I told you is just plain impossible,
	I know that it simply can never happen. And yet I face it now and
	frankly speaking have no ideas as to what all this actually means.

>How-To-Repeat:

	1. First, you need to patch your 2.2.[78]-RELEASE sio.c & sioreg.h
	   to get the new enhanced version of the sio driver.
	   The patch named sio-228.patch is in the sio-228.patch.tgz file
	   included in this report. You may also want to look through
	   the README.sio-228.patch (not required).

	2. Second, you want to make a new kernel with the new patched sio
	   driver. To be able to reproduce the bug we are talking about
	   you need to enable 2 options:
		options COM_MULTIPORT
		options COM_MULTIPORT_SEPARATE_IRQS
	   because the 2 variables in question are in the multiport code
	   portion that is compiled in only if those options are enabled.
	   Alternatively, you may add the following 2 defines to
	   /sys/compile/<YOURKERNEL>/sio.h:
		#define COM_MULTIPORT
		#define COM_MULTIPORT_SEPARATE_IRQS
	   (in case you don't want to reconfigure & recompile your kernel
	   from scratch).

	   After "make kernel" is complete, I recommend making copies of
	   the "sio.o" and "kernel":
	   	cp sio.o sio.IRQ.o
	   	cp kernel kernel.IRQ

	3. Next, you need to patch your sio.c again to make this innocent
	   cosmetic change. You may use sio-IRQ-irq.patch that is included
	   in this report, or just replace all instances of the text
	   "SameIRQ" with "Sameirq" throughout the sio.c (2 variables are
	   affected).

	4. "make kernel" once again.
	   	cp sio.o sio.irq.o
	   	cp kernel kernel.irq

	5. Now you can compare "sio.IRQ.o" and "sio.irq.o" (in my case,
	   they differ in 6 bytes as should be) as well as "kernel.IRQ"
	   and "kernel.irq" (in my case, they differ a lot, which is
	   very strange!)

	6. You may boot from "kernel.IRQ" (then from "kernel.irq") and try
	   to access your com ports with something like "cu -l cuaaX -s <speed>"
	   It works just great when I boot from "kernel.IRQ" but crashes
	   when I boot from "kernel.irq". (Be careful to disable your
	   /etc/rc.serial code, if any, or you risk crashing right
	   in the middle of the multiuser boot process)

begin 644 sio-IRQ-irq.patch.gz
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AGY.H.J6>!+W!IJ6BCKG,_-!A@I\<N=#.OQ[-%P<8"```
`
end

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`
end

>Fix:
	
	Unknown
>Release-Note:
>Audit-Trail:
>Unformatted:

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