diff options
| author | Pedro Alves <palves@redhat.com> | 2016-03-01 13:11:08 +0000 |
|---|---|---|
| committer | Pedro Alves <palves@redhat.com> | 2016-03-01 16:42:38 +0000 |
| commit | 2cd00eb8bdfa5b68cd45b3c9c3ed9538712f65fc (patch) | |
| tree | 73720ae96941515431b21cf797e57610696c66b1 | |
| parent | 046810ef7fcb1d718c3cada3ac524d18c4664d89 (diff) | |
| download | binutils-gdb-users/palves/proc-not-mounted.tar.gz | |
Fix PR gdb/19676: Internal error in linux-thread.db.c if /proc not mountedusers/palves/proc-not-mounted
If /proc is not mounted, GDB fails an assertion in find_new_threads_once:
Continuing.
/home/pedro/gdb/mygit/src/gdb/linux-thread-db.c:1249: internal-error: find_new_threads_once: Assertion `!target_has_execution' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n)
That was supposed to catch misuses of td_ta_thr_iter, which is unsafe
for live debugging. However, if /proc is not mounted, we still
fallback to using it.
I didn't bother with a warning, because GDB already prints several
others related to failing to open /proc files.
gdb/ChangeLog:
2016-03-01 Pedro Alves <pedro@cascais.lan>
PR gdb/19676
* linux-thread-db.c (try_thread_db_load_1): Leave
info->td_ta_thr_iter_p NULL iff debugging a live process and we
have /proc access.
(find_new_threads_once): Assert that we have a non-NULL
info->td_ta_thr_iter_p instead of checking whether the target has
execution.
| -rw-r--r-- | gdb/linux-thread-db.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/gdb/linux-thread-db.c b/gdb/linux-thread-db.c index 1eb457de105..ce60bebe3c9 100644 --- a/gdb/linux-thread-db.c +++ b/gdb/linux-thread-db.c @@ -564,7 +564,6 @@ try_thread_db_load_1 (struct thread_db_info *info) /* These are essential. */ CHK (TDB_VERBOSE_DLSYM (info, td_ta_map_lwp2thr)); - CHK (TDB_VERBOSE_DLSYM (info, td_ta_thr_iter)); CHK (TDB_VERBOSE_DLSYM (info, td_thr_validate)); CHK (TDB_VERBOSE_DLSYM (info, td_thr_get_info)); @@ -572,10 +571,6 @@ try_thread_db_load_1 (struct thread_db_info *info) TDB_DLSYM (info, td_thr_tls_get_addr); TDB_DLSYM (info, td_thr_tlsbase); -#undef TDB_VERBOSE_DLSYM -#undef TDB_DLSYM -#undef CHK - /* It's best to avoid td_ta_thr_iter if possible. That walks data structures in the inferior's address space that may be corrupted, or, if the target is running, may change while we walk them. If @@ -587,6 +582,15 @@ try_thread_db_load_1 (struct thread_db_info *info) currently on core targets, as it uses ptrace directly. */ if (target_has_execution && linux_proc_task_list_dir_exists (ptid_get_pid (inferior_ptid))) + info->td_ta_thr_iter_p = NULL; + else + CHK (TDB_VERBOSE_DLSYM (info, td_ta_thr_iter)); + +#undef TDB_VERBOSE_DLSYM +#undef TDB_DLSYM +#undef CHK + + if (info->td_ta_thr_iter_p == NULL) { struct lwp_info *lp; int pid = ptid_get_pid (inferior_ptid); @@ -1246,7 +1250,7 @@ find_new_threads_once (struct thread_db_info *info, int iteration, data.new_threads = 0; /* See comment in thread_db_update_thread_list. */ - gdb_assert (!target_has_execution); + gdb_assert (info->td_ta_thr_iter_p != NULL); TRY { |