Date: Mon, 17 Aug 1998 22:20:56 -0700 (PDT) From: Thomas Dean <tomdean@ix.netcom.com> To: current@FreeBSD.ORG Subject: Calloc or VM Problem Message-ID: <199808180520.WAA00323@ix.netcom.com>
next in thread | raw e-mail | index | archive | help
I noted some previous problems with calloc, and, thought they were
fixed. However, I seem to have a problem with calloc or vm.
It appears that calloc is stomping on a structure. I collected some
numbers on calloc operations. After poking with gdb for a long time,
I found that some of the structure entries were changing around the
calloc statement. It always changed the same section of the
structure. I added some fixed value checks just to catch this
problem. The "frame changed" message was always the line after the
calloc. I changed calloc to malloc and the problem is the same.
The process allocated a total of 1813088 bytes in 3713 operations.
==========================================================================
Here is the code fragment about the problem: (I xxxx'ed some names)
listPtr = xxxxHeader->xxxxEntry;
while(listPtr->entry != NULL) {
listPtr = listPtr->next;
}
if (xxxxHeader->xxxxx.len != 653) {
print("frame changed to %d at line %d\n",
xxxxHeader->xxxxx.len, __LINE__);
}
listPtr->entry= (Entry_t *) calloc((numEntries+1),sizeof(Entry_t));
if (xxxxHeader->xxxxx.len != 653) {
print("frame changed to %d at line %d\n",
xxxxHeader->xxxxx.len, __LINE__);
}
==========================================================================
# uname -a
FreeBSD celebris 3.0-CURRENT FreeBSD 3.0-CURRENT #1: Sat Aug 8 06:36:42 PDT1998
==========================================================================
# dmesg <snipped>
Copyright (c) 1982, 1986, 1989, 1991, 1993
The Regents of the University of California. All rights reserved.
FreeBSD 3.0-CURRENT #1: Sat Aug 8 06:36:42 PDT 1998
root@celebris:/usr/src/sys/compile/CELEBRIS-SMP
Timecounter "i8254" frequency 1193182 Hz cost 2540 ns
CPU: Pentium/P54C (586-class CPU)
Origin = "GenuineIntel" Id = 0x525 Stepping=5
Features=0x3bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8,APIC>
real memory = 100663296 (98304K bytes)
avail memory = 95268864 (93036K bytes)
FreeBSD/SMP: Multiprocessor motherboard
cpu0 (BSP): apic id: 0, version: 0x00030010, at 0xfee00000
cpu1 (AP): apic id: 1, version: 0x00030010, at 0xfee00000
io0 (APIC): apic id: 2, version: 0x000f0011, at 0xfec00000
Probing for devices on PCI bus 0:
chip0: <Intel 82434NX (Neptune) PCI cache memory controller>rev0x11on pci0.0.0
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-current" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199808180520.WAA00323>