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Fix for Linux 4.10 and later kdump dumpfiles, or kernels that have

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backported commit 401721ecd1dcb0a428aa5d6832ee05ffbdbffbbe, titled
"kexec: export the value of phys_base instead of symbol address".
Without the patch, if the x86_64 "phys_base" value in the VMCOREINFO
note is a negative negative decimal number, the crash session fails
during session intialization with a "page excluded" or "seek error"
when reading "page_offset_base".
(anderson@redhat.com)
This commit is contained in:
Dave Anderson 2017-05-02 16:51:53 -04:00
parent 14cbcd58c1
commit a4a538caca
1 changed files with 7 additions and 4 deletions
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11
x86_64.c
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@ -6219,11 +6219,14 @@ x86_64_calc_phys_base(void)
* Linux 4.10 exports it in VMCOREINFO (finally).
*/
if ((p1 = pc->read_vmcoreinfo("NUMBER(phys_base)"))) {
machdep->machspec->phys_base = dtol(p1, QUIET, NULL);
free(p1);
if (*p1 == '-')
machdep->machspec->phys_base = dtol(p1+1, QUIET, NULL) * -1;
else
machdep->machspec->phys_base = dtol(p1, QUIET, NULL);
if (CRASHDEBUG(1))
fprintf(fp, "VMCOREINFO: phys_base: %lx\n",
machdep->machspec->phys_base);
fprintf(fp, "VMCOREINFO: NUMBER(phys_base): %s -> %lx\n",
p1, machdep->machspec->phys_base);
free(p1);
return;
}