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linux_nat.c: Mark new thread running even if momentarily pausing 

My all-stop-on-top-of-non-stop series manages to trip on a bug in the
linux-nat.c backend while running the testsuite.  If a thread is
discovered while threads are being momentarily paused (without the
core's intervention), the thread ends up stuck in THREAD_STOPPED
state, even though from the user's perspective, the thread is running
even while it is paused.

From inspection, in the current sources, this can happen if we call
stop_and_resume_callback, though there's no way to test that with
current Linux kernels.

(While trying to come up with test to exercise this, I stumbled on:
  https://sourceware.org/ml/gdb-patches/2015-03/msg00850.html

... which does include a non-trivial test, so I think I can still
claim I come out net positive. :-) )

Tested on x86_64 Fedora 20.

gdb/ChangeLog:
2015-04-01  Pedro Alves  <palves@redhat.com>

	* linux-nat.c (linux_handle_extended_wait): Always call set_running.
This commit is contained in:
Pedro Alves 2015-03-24 14:24:53 +00:00
parent 3c724c8ca9
commit 2ee52aa428
2 changed files with 8 additions and 1 deletions
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4
gdb/ChangeLog
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@ -1,3 +1,7 @@
2015-04-01 Pedro Alves <palves@redhat.com>
* linux-nat.c (linux_handle_extended_wait): Always call set_running.
2015-04-01 Pierre-Marie de Rodat <derodat@adacore.com>
* MAINTAINERS (Write After Approval): Add "Pierre-Marie de Rodat".

5
gdb/linux-nat.c
View File

@ -2109,9 +2109,12 @@ linux_handle_extended_wait (struct lwp_info *lp, int status,
add_thread (new_lp->ptid);
}
/* Even if we're stopping the thread for some reason
internal to this module, from the user/frontend's
perspective, this new thread is running. */
set_running (new_lp->ptid, 1);
if (!stopping)
{
set_running (new_lp->ptid, 1);
set_executing (new_lp->ptid, 1);
/* thread_db_attach_lwp -> lin_lwp_attach_lwp forced
resume_stop. */