[bootlin/training-materials updates] master: debugging: labs: gdb: use gdbserver --multi (22826e76)

Clément Léger clement.leger at bootlin.com
Tue Nov 22 11:13:58 CET 2022

Repository : https://github.com/bootlin/training-materials
On branch  : master
Link       : https://github.com/bootlin/training-materials/commit/22826e767f300b062d0df600d100237076b7a22d


commit 22826e767f300b062d0df600d100237076b7a22d
Author: Clément Léger <clement.leger at bootlin.com>
Date:   Tue Nov 22 11:13:58 2022 +0100

    debugging: labs: gdb: use gdbserver --multi
    Signed-off-by: Clément Léger <clement.leger at bootlin.com>


 .../debugging-application-crash.tex                            | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/labs/debugging-application-crash/debugging-application-crash.tex b/labs/debugging-application-crash/debugging-application-crash.tex
index 294c2620..a7ec8346 100644
--- a/labs/debugging-application-crash/debugging-application-crash.tex
+++ b/labs/debugging-application-crash/debugging-application-crash.tex
@@ -40,10 +40,10 @@ $ ./linked_list
 From what you can see, it actually crashes ! So we will use GDB to debug that
 program. We will do that remotely since our target does not embed a full gdb,
 only a gdbserver, a lightweight gdb server that allows connecting with a remote
-full feature GDB. Start our program using gdbserver:
+full feature GDB. Start our program using gdbserver in multi mode:
-$ gdbserver localhost:2000 ./linked_list
+$ gdbserver --multi :2000 ./linked_list
 On the host side install gdb-multiarch if not already done and attach to this
@@ -52,7 +52,8 @@ process using gdb-multiarch:
 $ sudo apt install gdb-multiarch
 $ gdb-multiarch ./linked_list
-(gdb) target remote <target_ip>:2000
+(gdb) target extended-remote
+(gdb) set sysroot /home/<user>/debugging-labs/buildroot/output/target/
 Then continue the execution and try to find the error using GDB. There are
@@ -63,6 +64,9 @@ to understand
 functions can also be called directly from gdb ! Try to call
+{\note NOTE: you can exit gdbserver from the connected gdb process using the
+\code{monitor exit} command.}
 \section{Using a coredump with GDB}
 Sometimes, the problems only arise in production and you can only gather data

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