Re: [Crash-utility] EXT: RE: disk_dump_header status value
Hello Kazu,
Thanks for the explanation. It's now clear.
I was mixing DISKDUMP_LOCAL and KDUMP_COMPRESSED_LOCAL dumpfiles.
Best regards,
Patrick Agrain
-----Message d'origine-----
De : HAGIO KAZUHITO(萩尾 一仁) [mailto:k-hagio-ab@nec.com]
Envoyé : mercredi 10 mars 2021 02:52
À : Agrain Patrick <patrick.agrain(a)al-enterprise.com>
Cc : Discussion list for crash utility usage, maintenance and development
<crash-utility(a)redhat.com>
Objet : EXT: RE: disk_dump_header status value
** External email - Please consider with caution **
-----Original Message-----
Hello,
I have a dump file produced by makedumpfile with following command:
/sbin/makedumpfile -d 0 -c --message-level 7 /proc/vmcore
/tmpd/crashdump-`date +"%Y%m%d-%H%M"`
When I edit the raw binary, it seems that the first bytes could be mapped to a
disk_dump_header structure.
Is that correct ?
Correct.
When doing this, all seems to match: signature (KDUMP), header version (6), utsname
content, timestamp.
But not the status: I get 1 (INCOMPLETED), tough I’m able to analyze it with ‘crash’.
I was expecting 0 or at least 8, because it should be zlib-compressed.
The INCOMPLETED status value you're saying is a diskdump one, makedumpfile doesn't
use those values. Please see "help -D"
crash> help -D
...
status: 1 (DUMP_DH_COMPRESSED_ZLIB)
and crash's __diskdump_memory_dump():
fprintf(fp, " status: %x (", dh->status);
switch (dd->flags & (DISKDUMP_LOCAL|KDUMP_CMPRS_LOCAL))
{
case DISKDUMP_LOCAL:
if (dh->status == DUMP_HEADER_COMPLETED)
fprintf(fp, "DUMP_HEADER_COMPLETED");
else if (dh->status == DUMP_HEADER_INCOMPLETED)
fprintf(fp, "DUMP_HEADER_INCOMPLETED");
else if (dh->status == DUMP_HEADER_COMPRESSED)
fprintf(fp, "DUMP_HEADER_COMPRESSED");
break;
case KDUMP_CMPRS_LOCAL:
if (dh->status & DUMP_DH_COMPRESSED_ZLIB)
fprintf(fp, "DUMP_DH_COMPRESSED_ZLIB");
if (dh->status & DUMP_DH_COMPRESSED_LZO)
fprintf(fp, "DUMP_DH_COMPRESSED_LZO");
if (dh->status & DUMP_DH_COMPRESSED_SNAPPY)
fprintf(fp, "DUMP_DH_COMPRESSED_SNAPPY");
if (dh->status & DUMP_DH_COMPRESSED_INCOMPLETE)
fprintf(fp, "DUMP_DH_COMPRESSED_INCOMPLETE");
if (dh->status & DUMP_DH_EXCLUDED_VMEMMAP)
fprintf(fp, "DUMP_DH_EXCLUDED_VMEMMAP");
break;
}
Thanks,
Kazu