** Description changed:
+ [ Impact ]
+
In debian/rules.d/2-binary-arch.mk, stamp-build-% targets, we have:
```
# Collect the list of kernel source files used for this build. Need to do
this early
# before modules are stripped. Fail if the resulting file is empty.
find $(build_dir) \( -name vmlinux -o -name \*.ko \) -exec dwarfdump -i {} \;
| \
- grep -E 'DW_AT_(call|decl)_file' | sed -n 's|.*\s/|/|p' | sort -u > \
- $(build_dir)/sources.list
+ grep -E 'DW_AT_(call|decl)_file' | sed -n 's|.*\s/|/|p' | sort -u > \
+ $(build_dir)/sources.list
test -s $(build_dir)/sources.list
```
The process is single threaded and may takes up to half an hour to complete:
```
$ time ...
- real 28m15.167s
- user 54m32.917s
+ real 28m15.167s
+ user 54m32.917s
sys 4m32.531s
```
+
+ [ Fix ]
+
+ Process modules in parallel.
+
+ [ Test Plan ]
+
+ Inspect the build logs and verify reasonable run times for the
+ collection. Should be single digit minutes.
+
+ [ Where Problems Could Occur ]
+
+ Potential build failures due to CPU and/or memory starvation.
** Also affects: linux (Ubuntu Questing)
Importance: Medium
Assignee: You-Sheng Yang (vicamo)
Status: In Progress
** Changed in: linux (Ubuntu Questing)
Assignee: You-Sheng Yang (vicamo) => Juerg Haefliger (juergh)
** Changed in: linux (Ubuntu Plucky)
Assignee: You-Sheng Yang (vicamo) => Juerg Haefliger (juergh)
** Changed in: linux (Ubuntu Noble)
Assignee: (unassigned) => Juerg Haefliger (juergh)
** Changed in: linux (Ubuntu Jammy)
Assignee: (unassigned) => Juerg Haefliger (juergh)
** Changed in: linux (Ubuntu Focal)
Assignee: (unassigned) => Juerg Haefliger (juergh)
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https://bugs.launchpad.net/bugs/2104911
Title:
sources list generation using dwarfdump takes up to 0.5hr in build
process
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