The patch titled
Subject: scripts/gdb: fix failing KGDB detection during probe
has been added to the -mm mm-nonmm-unstable branch. Its filename is
scripts-gdb-fix-failing-kgdb-detection-during-probe.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/scripts-gdb-fix-failing-kgdb-detection-during-probe.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Florian Rommel <mail@xxxxxxxxxxxx>
Subject: scripts/gdb: fix failing KGDB detection during probe
Date: Thu, 25 Apr 2024 17:34:58 +0200
Patch series "scripts/gdb: Fixes for $lx_current and $lx_per_cpu".
This series fixes several bugs in the GDB scripts related to the
$lx_current and $lx_per_cpu functions. The changes were tested with GDB
10, 11, 12, 13, and 14.
Patch 1 fixes false-negative results when probing for KGDB
Patch 2 fixes the $lx_per_cpu function, which is currently non-functional
in QEMU-GDB and KGDB.
Patch 3 fixes an additional bug in $lx_per_cpu that occurs with KGDB.
Patch 4 fixes the incorrect detection of the current CPU number in KGDB,
which silently breaks $lx_per_cpu and $lx_current.
This patch (of 4):
The KGDB probe function sometimes failed to detect KGDB for SMP machines
as it assumed that task 2 (kthreadd) is running on CPU 0, which is not
necessarily the case. Now, the detection is agnostic to kthreadd's CPU.
Link: https://lkml.kernel.org/r/20240425153501.749966-1-mail@xxxxxxxxxxxx
Link: https://lkml.kernel.org/r/20240425153501.749966-2-mail@xxxxxxxxxxxx
Signed-off-by: Florian Rommel <mail@xxxxxxxxxxxx>
Cc: Andrew Jones <ajones@xxxxxxxxxxxxxxxx>
Cc: Deepak Gupta <debug@xxxxxxxxxxxx>
Cc: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Cc: Kieran Bingham <kbingham@xxxxxxxxxx>
Cc: Kuan-Ying Lee <Kuan-Ying.Lee@xxxxxxxxxxxx>
Cc: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
scripts/gdb/linux/utils.py | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/scripts/gdb/linux/utils.py~scripts-gdb-fix-failing-kgdb-detection-during-probe
+++ a/scripts/gdb/linux/utils.py
@@ -196,7 +196,7 @@ def get_gdbserver_type():
def probe_kgdb():
try:
thread_info = gdb.execute("info thread 2", to_string=True)
- return "shadowCPU0" in thread_info
+ return "shadowCPU" in thread_info
except gdb.error:
return False
_
Patches currently in -mm which might be from mail@xxxxxxxxxxxx are
scripts-gdb-fix-failing-kgdb-detection-during-probe.patch
scripts-gdb-fix-parameter-handling-in-lx_per_cpu.patch
scripts-gdb-make-get_thread_info-accept-pointers.patch
scripts-gdb-fix-detection-of-current-cpu-in-kgdb.patch
