gcore, handle exited threads better
An early (and since discarded) version of this series tried to make exited threads have distinct PTID between each other, and that change exposed a problem in linux-tdep.c... This was exposed by the gdb.threads/gcore-stale-thread.exp testcase, which is exactly about calling gcore with an exited thread selected: (gdb) [Thread 0x7ffff7fb6740 (LWP 31523) exited] PASS: gdb.threads/gcore-stale-thread.exp: continue to breakpoint: break-here gcore /home/pedro/gdb/binutils-gdb/build/gdb/testsuite/outputs/gdb.threads/gcore-stale-thread/gcore-stale-thread.core /home/pedro/gdb/binutils-gdb/build/../src/gdb/inferior.c:66: internal-error: void set_current_inferior(inferior*): Assertion `inf != NULL' failed. A problem internal to GDB has been detected, That was find_inferior_ptid being called on the "exited" ptid, which on that previous (and discarded attempt) had pid==-1. The problem is that linux-tdep.c, where it looks for the signalled thread, isn't considering exited threads. Also, while at it, that code isn't considering multi-target either, since it is using iterate_over_threads which iterates over all threads of all targets. Fixed by switching to range-for iteration instead. gdb/ChangeLog: 2020-06-18 Pedro Alves <palves@redhat.com> * linux-tdep.c (find_signalled_thread(thread_info *,void *)): Delete. (find_signalled_thread()): New, factored out from linux_make_corefile_notes and adjusted to handle exited threads. (linux_make_corefile_notes): Adjust to use the new find_signalled_thread.
This commit is contained in:
parent
41792d688a
commit
8df017996f
@ -1,3 +1,12 @@
|
||||
2020-06-18 Pedro Alves <palves@redhat.com>
|
||||
|
||||
* linux-tdep.c (find_signalled_thread(thread_info *,void *)):
|
||||
Delete.
|
||||
(find_signalled_thread()): New, factored out from
|
||||
linux_make_corefile_notes and adjusted to handle exited threads.
|
||||
(linux_make_corefile_notes): Adjust to use the new
|
||||
find_signalled_thread.
|
||||
|
||||
2020-06-18 Pedro Alves <palves@redhat.com>
|
||||
|
||||
* linux-tdep.c (btrace_fetch): Save/restore current thread instead
|
||||
|
@ -1396,18 +1396,6 @@ linux_find_memory_regions (struct gdbarch *gdbarch,
|
||||
&data);
|
||||
}
|
||||
|
||||
/* Determine which signal stopped execution. */
|
||||
|
||||
static int
|
||||
find_signalled_thread (struct thread_info *info, void *data)
|
||||
{
|
||||
if (info->suspend.stop_signal != GDB_SIGNAL_0
|
||||
&& info->ptid.pid () == inferior_ptid.pid ())
|
||||
return 1;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* This is used to pass information from
|
||||
linux_make_mappings_corefile_notes through
|
||||
linux_find_memory_regions_full. */
|
||||
@ -1855,6 +1843,30 @@ linux_fill_prpsinfo (struct elf_internal_linux_prpsinfo *p)
|
||||
return 1;
|
||||
}
|
||||
|
||||
/* Find the signalled thread. In case there's more than one signalled
|
||||
thread, prefer the current thread, if it is signalled. If no
|
||||
thread was signalled, default to the current thread, unless it has
|
||||
exited, in which case return NULL. */
|
||||
|
||||
static thread_info *
|
||||
find_signalled_thread ()
|
||||
{
|
||||
thread_info *curr_thr = inferior_thread ();
|
||||
if (curr_thr->state != THREAD_EXITED
|
||||
&& curr_thr->suspend.stop_signal != GDB_SIGNAL_0)
|
||||
return curr_thr;
|
||||
|
||||
for (thread_info *thr : current_inferior ()->non_exited_threads ())
|
||||
if (thr->suspend.stop_signal != GDB_SIGNAL_0)
|
||||
return thr;
|
||||
|
||||
/* Default to the current thread, unless it has exited. */
|
||||
if (curr_thr->state != THREAD_EXITED)
|
||||
return curr_thr;
|
||||
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
/* Build the note section for a corefile, and return it in a malloc
|
||||
buffer. */
|
||||
|
||||
@ -1864,7 +1876,6 @@ linux_make_corefile_notes (struct gdbarch *gdbarch, bfd *obfd, int *note_size)
|
||||
struct linux_corefile_thread_data thread_args;
|
||||
struct elf_internal_linux_prpsinfo prpsinfo;
|
||||
char *note_data = NULL;
|
||||
struct thread_info *curr_thr, *signalled_thr;
|
||||
|
||||
if (! gdbarch_iterate_over_regset_sections_p (gdbarch))
|
||||
return NULL;
|
||||
@ -1892,26 +1903,21 @@ linux_make_corefile_notes (struct gdbarch *gdbarch, bfd *obfd, int *note_size)
|
||||
}
|
||||
|
||||
/* Like the kernel, prefer dumping the signalled thread first.
|
||||
"First thread" is what tools use to infer the signalled thread.
|
||||
In case there's more than one signalled thread, prefer the
|
||||
current thread, if it is signalled. */
|
||||
curr_thr = inferior_thread ();
|
||||
if (curr_thr->suspend.stop_signal != GDB_SIGNAL_0)
|
||||
signalled_thr = curr_thr;
|
||||
else
|
||||
{
|
||||
signalled_thr = iterate_over_threads (find_signalled_thread, NULL);
|
||||
if (signalled_thr == NULL)
|
||||
signalled_thr = curr_thr;
|
||||
}
|
||||
"First thread" is what tools use to infer the signalled
|
||||
thread. */
|
||||
thread_info *signalled_thr = find_signalled_thread ();
|
||||
|
||||
thread_args.gdbarch = gdbarch;
|
||||
thread_args.obfd = obfd;
|
||||
thread_args.note_data = note_data;
|
||||
thread_args.note_size = note_size;
|
||||
thread_args.stop_signal = signalled_thr->suspend.stop_signal;
|
||||
if (signalled_thr != nullptr)
|
||||
thread_args.stop_signal = signalled_thr->suspend.stop_signal;
|
||||
else
|
||||
thread_args.stop_signal = GDB_SIGNAL_0;
|
||||
|
||||
linux_corefile_thread (signalled_thr, &thread_args);
|
||||
if (signalled_thr != nullptr)
|
||||
linux_corefile_thread (signalled_thr, &thread_args);
|
||||
for (thread_info *thr : current_inferior ()->non_exited_threads ())
|
||||
{
|
||||
if (thr == signalled_thr)
|
||||
|
Loading…
Reference in New Issue
Block a user