Date: Sun, 31 Jan 1999 10:20:01 -0800 (PST) From: Sakari Jalovaara <sakari@regex.fi> To: freebsd-bugs@FreeBSD.ORG Subject: Re: kern/9407: "make kernel" yields buggy kernel in ceratin cases (ld bug?) Message-ID: <199901311820.KAA59371@freefall.freebsd.org>
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The following reply was made to PR kern/9407; it has been noted by GNATS. From: Sakari Jalovaara <sakari@regex.fi> To: freebsd-gnats-submit@freebsd.org, olwi@icyb.kiev.ua Cc: Subject: Re: kern/9407: "make kernel" yields buggy kernel in ceratin cases (ld bug?) Date: Sun, 31 Jan 1999 20:16:06 +0200 > [changing the name of a variable produces very different > kernels, one of which crashes] 'cmp -l kernel.IRQ kernel.irq' probably produces lots of output because some sort of symbol table hashing/sorting/whatever in 'ld'. Compile the following: #include <stdio.h> int aa; int bb; int main (void) { printf ("%d\n", &aa < &bb); return 0; } cc tst.c mv a.out a.out-bb <edit tst.c and change 'bb's to 'zz'> cc tst.c cmp -l a.out a.out-bb -- gives more than four bytes worth of output. Also, when you rename 'bb' to 'zz' in the above program, the output of the program changes (at least on 4.0-current/ELF it does -- for other versions of 'ld' some other name than 'zz' may do this.) A more likely explanation than an ld bug is that either the patch or the original sio.c has a bug whose behavior is changed when objects are re-ordered in memory. For a first guess, I'd try placing assert (xxx >= 0 && xxx < NSIOTOT); statements wherever SameIRQ[xxx] is accessed. ++sja To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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