[Bug server/13984] gdb stops controlling a thread after "Remote 'g' packet reply is too long: ..." error message

[ciro.santilli at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=13984

Ciro Santilli <ciro.santilli at gmail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |ciro.santilli at gmail dot com

--- Comment #4 from Ciro Santilli <ciro.santilli at gmail dot com> ---
@Mehmet can you please make a patch, send to the mailing list, and keep pinging
weekly until it gets reviewed?

I reproduce this by taking the following steps:

    # On kernel 4.1, set `CONFIG_DEBUG_INFO` and `CONFIG_GDB_SCRIPTS`.
    qemu-system-x86_64 -kernel ../build/arch/x86/boot/bzImage -initrd
rootfs.cpio.gz -S -s
    gdb -ex "add-auto-load-safe-path ${vmlinux_path}-gdb.py" \
        -ex "file ${vmlinux_path}" \
        -ex 'target remote localhost:1234'
    hbreak start_kernel
    continue

Then the:

    Remote 'g' packet reply is too long

message appears, QEMU stops (apparently at the right place) and for most
commands I run, e.g. continue, GDB says:

    (gdb) continue
    Continuing.
    Cannot execute this command while the selected thread is running.

`list` shows the wrong lines, not at `start_kernel` but around line 15. It is
the right file however: `init/main.c`.

If I do Ctrl + D GDB quits and QEMU continues booting as normal.

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