81 lines
2.5 KiB
Diff
81 lines
2.5 KiB
Diff
http://sourceware.org/ml/gdb-patches/2012-04/msg00058.html
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Subject: [downstream patch FYI] workaround stale frame_info * (PR 13866)
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Hi,
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I did not look at which commit caused this regression but apparently it was
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introduced at least with multi-inferiors.
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I understand this fix is not right fix of the crash; but in most GDB cases one
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does not use multi-inferior so why to regress single-inferior by it.
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Some more simple solutions still fix the single-inferior mode but they
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regressed the multi-inferior mode
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gdb.threads/no-unwaited-for-left.exp
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gdb.multi/base.exp
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so I had to put there that sorting magic.
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With proper C++ sanity check of stale live frame_info references the testcase
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would be simple without the "frame_garbage_collection" reproducer below.
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It is also reproducible just with valgrind but regularly running the whole
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testsuite under valgrind I did not find feasible.
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No regressions on {x86_64,x86_64-m32,i686}-fedora17-linux-gnu.
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Thanks,
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Jan
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gdb/
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2012-04-04 Jan Kratochvil <jan.kratochvil@redhat.com>
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Workaround PR backtrace/13866.
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* progspace.c (switch_to_program_space_and_thread): Try not to call
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switch_to_thread.
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Index: gdb-7.3.50.20110722/gdb/progspace.c
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===================================================================
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--- gdb-7.3.50.20110722.orig/gdb/progspace.c 2011-01-05 23:22:50.000000000 +0100
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+++ gdb-7.3.50.20110722/gdb/progspace.c 2012-04-04 23:07:16.329038403 +0200
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@@ -480,17 +480,36 @@ save_current_space_and_thread (void)
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void
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switch_to_program_space_and_thread (struct program_space *pspace)
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{
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- struct inferior *inf;
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+ struct inferior *inf = current_inferior ();
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- inf = find_inferior_for_program_space (pspace);
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+ if (inf->pspace != pspace)
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+ inf = find_inferior_for_program_space (pspace);
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if (inf != NULL)
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{
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- struct thread_info *tp;
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+ struct thread_info *tp, *current_tp = NULL;
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+
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+ if (ptid_get_pid (inferior_ptid) == inf->pid)
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+ current_tp = find_thread_ptid (inferior_ptid);
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tp = any_live_thread_of_process (inf->pid);
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if (tp != NULL)
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{
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- switch_to_thread (tp->ptid);
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+ /* thread.c */
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+ enum thread_state
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+ {
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+ THREAD_STOPPED,
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+ THREAD_RUNNING,
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+ THREAD_EXITED,
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+ };
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+
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+ /* Prefer primarily thread not THREAD_EXITED and secondarily thread
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+ not EXECUTING. */
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+ if (current_tp == NULL
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+ || (tp->state_ != THREAD_EXITED
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+ && current_tp->state_ == THREAD_EXITED)
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+ || (!tp->executing_ && current_tp->executing_))
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+ switch_to_thread (tp->ptid);
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+
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/* Switching thread switches pspace implicitly. We're
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done. */
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return;
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