GDB tracing: Target returns error code '01' after continue command

Question

I am trying to obtain GDB traces as described in this other question. For completeness, on one terminal I am running:

$ gdbserver :1234 ./a.out 
Process ./a.out created; pid = 13610
Listening on port 1234

And on another one (client):

$ gdb ./a.out
...
GNU gdb (Ubuntu 9.2-0ubuntu1~20.04.1) 9.2
Reading symbols from ./a.out...
(gdb) target remote :1234
Remote debugging using :1234
Reading /lib64/ld-linux-x86-64.so.2 from remote target...
warning: File transfers from remote targets can be slow. Use "set sysroot" to access files locally instead.
Reading /lib64/ld-linux-x86-64.so.2 from remote target...
Reading symbols from target:/lib64/ld-linux-x86-64.so.2...
Reading symbols from /usr/lib/debug/.build-id/45/87364908de169dec62ffa538170118c1c3a078.debug...
0x00007ffff7fd0100 in _start () from target:/lib64/ld-linux-x86-64.so.2
(gdb) trace 3
Tracepoint 1 at 0x555555555157: file ../test/main.cpp, line 3.
(gdb)  b 9
Breakpoint 2 at 0x55555555519a: file ../test/main.cpp, line 9.
(gdb) actions 1
Enter actions for tracepoint 1, one per line.
End with a line saying just "end".
>collect $regs,$args
>end
(gdb) tstart
(gdb) c

And here is where it differs from the other question, I get the error when I want to continue to the breakpoint at 9:

Continuing.
Reading /lib/x86_64-linux-gnu/libc.so.6 from remote target...
Target returns error code '01'.

I tried the whole experiment without the tracepoint, and the continue command works correctly.

Of course I tried googling the error code 01, but seems pretty generic so I could not draw any conclusions. Any idea what could be going wrong?

PidTuner · Accepted Answer · 2023-09-11 19:33:01Z

1

It appears to be a known issue, apparently tracepoints have been broken since binutils 2.33 and a patch was added to fix them in 2.41.

Your GDB/binutils version must be some inbetween. Here are the two commits:

Broken since binutils-2_33 (07/2019) : cb1e4e32c2d9588e1d77ea49bafb5dcdc1cff764
Fixed from binutils-2_41 (03/2023) : 0b63c811efc38f50b72422ed6a9db1de053e8736

Try again with version 2.41 or later.

answered Sep 11, 2023 at 19:33

PidTuner

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2 Comments

Juan Gonzalez Burgos Over a year ago

This is the answer, I had to build the latest GDB myself, the one that came with the system was: GNU gdb (Ubuntu 9.2-0ubuntu1~20.04.1) 9.2 The one I built: GNU gdb (GDB) 14.0.50.20230730-git Now it works. thanks!

PidTuner Over a year ago

Just beware of the comment in the issue description: > "Things remain quite broken in that area though." Meaning tracepoints support in GDB seems to be unmaintained and probably not fully functional.

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