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| author | Karl Mehltretter <kmehltretter@gmail.com> | 2026-07-23 06:10:55 +0200 |
|---|---|---|
| committer | Geert Uytterhoeven <geert@linux-m68k.org> | 2026-08-10 11:47:59 +0200 |
| commit | 09f71dbeb287e367beea56d9ac8a3d356ef5e02a (patch) | |
| tree | 6fb0eb966f85ef4615331d0c76bac98bf9024be3 /scripts/stackusage | |
| parent | 993e1b93dbf64177551271496d92512a1d2c8643 (diff) | |
| download | linux-09f71dbeb287e367beea56d9ac8a3d356ef5e02a.tar.gz linux-09f71dbeb287e367beea56d9ac8a3d356ef5e02a.zip | |
m68k: Fix backtraces for non-running tasks
When no stack pointer is supplied, show_stack() starts at thread.esp0.
This is the saved userspace register frame, not where a task was switched
out. For kernel threads it points to the zeroed frame created by
copy_thread(), so sched_show_task() prints no useful backtrace.
Use thread.ksp for non-current tasks. It is saved by switch_to() and is
already used by __get_wchan(). For current, start at the current stack
frame, as is already done when no task is supplied.
Tested on qemu-system-m68k -M virt using SysRq-t. All task dumps contained
resolved frames.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Assisted-by: Claude:claude-opus-4-8
Signed-off-by: Karl Mehltretter <kmehltretter@gmail.com>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://patch.msgid.link/20260723041055.47289-1-kmehltretter@gmail.com
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'scripts/stackusage')
0 files changed, 0 insertions, 0 deletions