Re: [Qemu-devel] [PATCH 0/3] qemu-gdb: add functionality for inspecting core dumps

[Stefan Hajnoczi]

On Mon, Oct 12, 2015 at 10:02:51AM +0200, Paolo Bonzini wrote:
> Currently it is very hard to inspect coroutine in core dumps, because
> none of the qemu-gdb functionality works.  Fixing this is not really
> possible because "bt" only works on the core dump's stack pointer and
> program counter, but the situation would improve noticeably if only
> a coroutine's stack pointer and program counter were accessible at all;
> that would allow inspecting the coroutine's stack and building a
> stack trace from the hex dump of the stack.
> 
> The main hurdle is that glibc_pointer_guard() cannot be run on a core
> dump, because get_fs_base() uses the arch_prctl system call.  The first
> patch modifies that to use the gdb API instead.  The second and third
> patch then add the new functions.
> 
> Paolo
> 
> Paolo Bonzini (3):
>   qemu-gdb: allow using glibc_pointer_guard() on core dumps
>   qemu-gdb: extract parts of "qemu coroutine" implementation
>   qemu-gdb: add $qemu_coroutine_sp and $qemu_coroutine_pc
> 
>  scripts/qemu-gdb.py          |  3 ++
>  scripts/qemugdb/coroutine.py | 90 
> +++++++++++++++++++++++++++++---------------
>  2 files changed, 62 insertions(+), 31 deletions(-)

Thanks, applied to my block tree:
https://github.com/stefanha/qemu/commits/block

Stefan