Bug 475208

Summary:	error: cannot take snapshot before execution has started
Product:	[Developer tools] valgrind	Reporter:	Fred M <dark_footix>
Component:	massif	Assignee:	Nicholas Nethercote <njn>
Status:	REPORTED ---
Severity:	normal
Priority:	NOR
Version First Reported In:	3.22 GIT
Target Milestone:	---
Platform:	Other
OS:	Other
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Fred M 2023-10-04 10:40:41 UTC

SUMMARY

By running valgrind memory leak with a heavy application : 
valgrind --tool=massif my_apps &

The detail_snapshot is failing : 
vgdb detailed_snapshot /tmp/massif2023-10-04_12-21-23_0.out
sending command detailed_snapshot /tmp/massif2023-10-04_12-21-23_0.out to pid 1941
error: cannot take snapshot before execution has started

Instead of adding a temporization with "sleep" between the valgrind and vgdb command.
Is there or could it have a function to wait that Valgrind is ready ? 
A blocking/sync wait argument to the vgdb? 
or an option/return vgdb to know everything is ready? I can do the detailed_snapshot.

Regards,
Frédéric 

SOFTWARE/OS VERSIONS
Linux/KDE Plasma:  ARM / linux

Comment 1 Fred M 2023-10-04 11:12:39 UTC

I workarounded like this : 

sleep 10
vgdb detailed_snapshot my_output.out
while [[ $? != 0 ]]; do
  sleep 60
  vgdb detailed_snapshot my_output.out
done