Bug 27915 - Cannot handle 8-byte build ID
Summary: Cannot handle 8-byte build ID
Status: RESOLVED NOTABUG
Alias: None
Product: debugedit
Classification: Unclassified
Component: debugedit (show other bugs)
Version: unspecified
: P2 normal
Target Milestone: ---
Assignee: Not yet assigned to anyone
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2021-05-26 09:45 UTC by Matthias Klose
Modified: 2021-05-26 14:24 UTC (History)
2 users (show)

See Also:
Host:
Target:
Build:
Last reconfirmed:
Project(s) to access:
ssh public key:

Attachments
test case (954.61 KB, application/x-xz)
2021-05-26 09:45 UTC, Matthias Klose 		Details
View All Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description Matthias Klose 2021-05-26 09:45:13 UTC 
Created attachment 13471 [details]
test case

seen when building the nageru package in Ubuntu:

full build log at
https://launchpad.net/ubuntu/+source/nageru/2.0.1-3/+build/21476382

$ debugedit --build-id --build-id-seed=nageru/2.0.1-3 debian/nageru/usr/bin/kaeru
debugedit: debian/nageru/usr/bin/kaeru: Unknown DWARF DW_FORM_0x1f20
Cannot handle 8-byte build ID
Comment 1 Mark Wielaard 2021-05-26 12:50:25 UTC 
(In reply to Matthias Klose from comment #0)
> Cannot handle 8-byte build ID

An 8-byte (just 64bits) build ID doesn't make much sense.
It is too small to make sure it is a globally unique identifier.
You need 16 bytes (128 bits) minimum.

This must be a linker bug. Older lld had a bug where they had a "fast" build-id generator that produced such small (useless) build-ids.
Comment 2 Matthias Klose 2021-05-26 14:16:27 UTC 
indeed, the package has a build dependency on lld. But "Older lld" means here LLVM 11 ...
Comment 3 Mark Wielaard 2021-05-26 14:24:00 UTC 
I see there is already an lld bug open against this:
https://bugs.llvm.org/show_bug.cgi?id=44138