On Mon., Feb. 8, 2021, 3:00 a.m. Nadav Har'El, <n...@scylladb.com> wrote:
> On Wed, Feb 3, 2021 at 1:18 AM Waldek Kozaczuk <jwkozac...@gmail.com> > wrote: > >> Currently, it is only possible to connect from gdb to a running instance >> of OSv on QEMU. But ideally, it would be nice to have a gdb stub in OSv >> that would let one connect from gdb to OSv running on any hypervisor. >> >> Per this fragment of this Wiki - >> https://github.com/cloudius-systems/osv/wiki/Debugging-OSv >> >> *"The fact that our gdb support works with the unit of cpus, not OSV >> threads, makes it convenient to debug OSV itself, but less convenient to >> debug application code running inside OSV. Particularly problematic is >> single stepping support which isn’t currently supported well: The problem >> is that when you try to look at a single OSV thread (see the next section), >> a single-step operation (“s” or “n”) makes one step inside the vcpu, not >> the osv thread*, and this step might include switching to a different >> thread. One way to work around this problem is to compile OSV with >> preemption disabled (not recommended, but can be a convenient trick in some >> debugging situations). *A better approach would have been to include a >> gdb stub into OSV itself, to allow gdb to see OSV threads directly and >> single-step them. We’ve made some progress in implementing such a stub, but >> it isn’t ready for prime-time yet.*" >> >> it looks like somebody may have implemented an initial version of the gdb >> stub. Is there a working patch of it somewhere? >> > > I have a vague recollection - it was many years ago - that Glauber (CCed) > was the one who tried doing it. > Glauber, if it was you, do you remember what you tried? > If it wasn't you, sorry for the spam :-) > I don't think it was me. I have no memory of ever doing this. But no need to be sorry, it's good to hear from you! > > >> Regards, >> Waldek >> >> -- >> You received this message because you are subscribed to the Google Groups >> "OSv Development" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to osv-dev+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/osv-dev/a3ca8d68-5994-4b51-94c4-539e2024f12dn%40googlegroups.com >> <https://groups.google.com/d/msgid/osv-dev/a3ca8d68-5994-4b51-94c4-539e2024f12dn%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "OSv Development" group. To unsubscribe from this group and stop receiving emails from it, send an email to osv-dev+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/osv-dev/CAA6-i6rAWgYqkCOPnGiQABpEfC%3DKqD1jCmmw82LEmrCNrHWyqA%40mail.gmail.com.
