gdb remote target of a guest VM fails to continue
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| | qemu (Ubuntu) |
Medium
|
Unassigned | ||
Bug Description
[Impact]
Debugging guest VMs fail due to not building package with --enable debug.
[Test Case]
1) run qemu with the -s option
2) install qemu ddeb
3) gdb /usr/bin/
(gdb) target remote localhost:1234
Remote debugging using localhost:1234
Reading symbols from /lib64/
done.
0x000000000052c7b5 in _start () from /lib64/
(gdb) c
Continuing.
Warning:
Cannot insert breakpoint -1.
Cannot access memory at address 0xbd260
Cannot insert breakpoint -6.
Temporarily disabling shared library breakpoints:
breakpoint #-6
[Fix]
Add --enable-debug debian/rules
| Changed in qemu (Ubuntu): | |
| assignee: | nobody → Chris J Arges (arges) |
| importance: | Undecided → High |
| status: | New → In Progress |
| Chris J Arges (arges) wrote : | #1 |
| summary: |
- gdb in a guest VM fails to continue + gdb remote target of a guest VM fails to continue |
| tags: | added: patch |
| Chris J Arges (arges) wrote : | #2 |
| Chris J Arges (arges) wrote : | #3 |
Test packages available here:
https:/
| Chris J Arges (arges) wrote : | #4 |
One thing to note going through the config file. With --enable-debug we no longer use -O2 for CFLAGS.
| Chris J Arges (arges) wrote : | #5 |
Potentially related:
https:/
| Changed in qemu (Ubuntu): | |
| importance: | High → Medium |
| Changed in qemu (Ubuntu): | |
| assignee: | Chris J Arges (arges) → nobody |
I measured bootup times on an idle host by rebooting a VM and logging the same
event in dmesg 15 times. Before it took an average of 9.8934s w/ stdev of 0.32.
After installing the new version it took 9.8159s w/ stdev of 0.34.
In addition before the total size of /usr/bin/
it was 135008515.
So it seems that size of binaries decreases, while enabling more functionality.
In addition, boot times seem comparable but it isn't definitively slower or
faster.