Date: Tue, 30 Nov 1999 14:31:07 -0500 (EST) From: David Gilbert <dgilbert@velocet.ca> To: stable@freebsd.org Subject: Stack/i386-type ugh question. Message-ID: <14404.9723.200774.823194@trooper.velocet.net>
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Ok... chasing down some memory corruption in FreeBSD's new vinum
code. I have the following:
#0 boot (howto=256) at ../../kern/kern_shutdown.c:285
#1 0xc0152738 in at_shutdown (
function=0xc0237182 <__set_sysinit_set_sym_memdev_sys_init+1050>, arg=0x0,
queue=12) at ../../kern/kern_shutdown.c:446
#2 0xc02093e5 in trap_fatal (frame=0xc024041c, eva=0)
at ../../i386/i386/trap.c:942
#3 0xc02090c3 in trap_pfault (frame=0xc024041c, usermode=0, eva=0)
at ../../i386/i386/trap.c:835
#4 0xc0208d66 in trap (frame={tf_es = -1057619952, tf_ds = -1058209776,
tf_edi = -1073215488, tf_esi = -1058136064, tf_ebp = -1071381356,
tf_isp = -1071381436, tf_ebx = -1057770468, tf_edx = 0,
tf_ecx = -1057770468, tf_eax = -919261248, tf_trapno = 12, tf_err = 0,
tf_eip = 0, tf_cs = 8, tf_eflags = 66054, tf_esp = -1072236031,
tf_ss = -1057770468}) at ../../i386/i386/trap.c:437
#5 0x0 in ?? ()
... now obviously frame 5 has been trashed, and I doubt that I can
purify my kernel (even if I had a copy). So. Which of those
registers is the program counter? I need to find the stack frame #6,
basically... but I suppose I need to know a few things...
Is frame #6 > or < the address of frame #5?
Is one of the elements of "frame" in frame 4 the PC... which might
contain a hint?
Dave.
--
============================================================================
|David Gilbert, Velocet Communications. | Two things can only be |
|Mail: dgilbert@velocet.net | equal if and only if they |
|http://www.velocet.net/~dgilbert | are precisely opposite. |
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