Date: Fri, 6 Apr 2018 17:22:45 -0400 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: GDB to debug threaded application On Fri, Apr 06, 2018 at 11:00:48PM +0200, Micha Nelissen wrote: > On 6 Apr 2018, at 19:22, Rich Felker <dalias@...c.org> wrote: > > > >> On Fri, Apr 06, 2018 at 06:33:35PM +0200, Micha Nelissen wrote: > >> Hi all, > >> > >> I have built a cross-toolchain (x86-64 to arm, gcc 5.4.0) with musl > >> (1.1.16) using buildroot (2017.02). I let buildroot build a gdb for > >> the arm platform. It runs, but when I debug my application, gdb > >> hangs after a thread is started. Can't interrupt it, have to kill > >> -KILL my application from another ssh session. > >> > >> I noticed that there is a libthread_db.so in the glibc-based > >> toolchain. Do I need something similar for musl? That > >> libthread_db.so needs libc.so.6 (glibc) so I guess I can't use it > >> as-is? > >> > >> Thanks for any pointers! > > > > No, musl does not use libthread_db.so, but presence of a glibc version > > of this library could break things badly. Make sure it's not being > > built or present in any location gdb might search. Are you using a > > remote/cross gdb (with gdbserver on the target) or local gdb? > > A local gdb. In the buildroot environment, no libthread_db is present I think. Can you reproduce this behavior (the hang) with a trivial test program that starts a thread, or does it only happen with your real application? Rich
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