bin/95405: libkvm does not support /dev/fwmem0.0 in FreeBSD 6 and
later.
Jonas Bülow
jonas.bulow at servicefactory.se
Thu Apr 6 11:50:26 UTC 2006
>Number: 95405
>Category: bin
>Synopsis: libkvm does not support /dev/fwmem0.0 in FreeBSD 6 and later.
>Confidential: no
>Severity: serious
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Apr 06 11:50:16 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator: Jonas Bülow
>Release: FreeBSD 6.0-p6
>Organization:
ServiceFactory
>Environment:
uname -a
FreeBSD h177.servicefactory.se 6.0-RELEASE-p6 FreeBSD 6.0-RELEASE-p6 #3: Thu Apr 6 08:14:28 CEST 2006 root at h177.servicefactory.se:/usr/obj/usr/src/sys/DEBUGHOST i386
>Description:
Programs using libkvm fails with:
<progname>: cannot mmap corefile
Since rev 1.16 of kvm_i386.c libkvm no longer supports /dev/fwmem0.0. The reason seems to be the change to use mmap for i386.
The failing call in libkvm is:
kvm_i386.c:105 vm->mmapbase = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0);
A comment at line 1113 in vm_mmap.c says:
/*
* cdevs does not provide private mappings of any kind.
*/
>How-To-Repeat:
dmesg -M /dev/fwmem0.0 -N kernel
dmesg: cannot mmap corefile
# kgdb kernel.debug /dev/fwmem0.0
kgdb: cannot mmap corefile
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
More information about the freebsd-bugs
mailing list