Valgrind reports the below leak:
==25327== VALGRIND_GDB_ERROR_BEGIN
==25327== 672 bytes in 1 blocks are definitely lost in loss record 2,759 of 3,251
==25327== at 0x4C2E07C: calloc (vg_replace_malloc.c:752)
==25327== by 0x7FDCB3E: ???
==25327== by 0x532A7A: try_thread_db_load_1 (linux-thread-db.c:828)
==25327== by 0x532A7A: try_thread_db_load(char const*, int) (linux-thread-db.c:997)
==25327== by 0x53354D: try_thread_db_load_from_sdir (linux-thread-db.c:1074)
==25327== by 0x53354D: thread_db_load_search (linux-thread-db.c:1129)
==25327== by 0x53354D: thread_db_load() (linux-thread-db.c:1187)
==25327== by 0x611AF1: operator() (functional:2127)
==25327== by 0x611AF1: notify (observable.h:106)
==25327== by 0x611AF1: symbol_file_add_with_addrs(bfd*, char const*, enum_flags<symfile_add_flag>, std::vector<other_sections, std::allocator<other_sections> >*, enum_flags<objfile_flag>, objfile*) (symfile.c:1158)
==25327== by 0x5F5C4A: solib_read_symbols(so_list*, enum_flags<symfile_add_flag>) (solib.c:691)
==25327== by 0x5F6A8B: solib_add(char const*, int, int) (solib.c:1003)
==25327== by 0x5F6BF7: handle_solib_event() (solib.c:1281)
==25327== by 0x3D0A94: bpstat_stop_status(address_space const*, unsigned long, thread_info*, target_waitstatus const*, bpstats*) (breakpoint.c:5417)
==25327== by 0x4FF133: handle_signal_stop(execution_control_state*) (infrun.c:5874)
==25327== by 0x502C29: handle_inferior_event_1 (infrun.c:5300)
==25327== by 0x502C29: handle_inferior_event(execution_control_state*) (infrun.c:5335)
==25327== by 0x5041DB: fetch_inferior_event(void*) (infrun.c:3868)
==25327== by 0x4A1E7C: gdb_wait_for_event(int) (event-loop.c:859)
...
This leak is created because a call to td_ta_new allocates some resources
that must be freed with td_ta_delete, and that was missing.
With this patch, the nr of GDB executions leaking during regression tests
decreases further from 566 to 380.
Note that the gdbserver equivalent code is properly calling
td_ta_delete: see thread_db_mourn in thread-db.c.
Tests run natively on debian/amd64, and run under valgrind.
gdb/ChangeLog
2018-12-08 Philippe Waroquiers <philippe.waroquiers@skynet.be>
* linux-thread-db.c (struct thread_db_info): Add td_ta_delete_p.
(thread_db_err_str): Forward declare.
(delete_thread_db_info): Call td_ta_delete_p if available.
(try_thread_db_load_1): Acquire td_ta_delete address.
* nat/gdb_thread_db.h (td_ta_delete_ftype): Declare.
+2018-12-08 Philippe Waroquiers <philippe.waroquiers@skynet.be>
+
+ * linux-thread-db.c (struct thread_db_info): Add td_ta_delete_p.
+ (thread_db_err_str): Forward declare.
+ (delete_thread_db_info): Call td_ta_delete_p if available.
+ (try_thread_db_load_1): Acquire td_ta_delete address.
+ * nat/gdb_thread_db.h (td_ta_delete_ftype): Declare.
+
2018-12-08 Pedro Alves <palves@redhat.com>
* source.c (forward_search_command): Rename to ...
2018-12-08 Pedro Alves <palves@redhat.com>
* source.c (forward_search_command): Rename to ...
td_init_ftype *td_init_p;
td_ta_new_ftype *td_ta_new_p;
td_init_ftype *td_init_p;
td_ta_new_ftype *td_ta_new_p;
+ td_ta_delete_ftype *td_ta_delete_p;
td_ta_map_lwp2thr_ftype *td_ta_map_lwp2thr_p;
td_ta_thr_iter_ftype *td_ta_thr_iter_p;
td_thr_get_info_ftype *td_thr_get_info_p;
td_ta_map_lwp2thr_ftype *td_ta_map_lwp2thr_p;
td_ta_thr_iter_ftype *td_ta_thr_iter_p;
td_thr_get_info_ftype *td_thr_get_info_p;
+static const char *thread_db_err_str (td_err_e err);
+
/* When PID has exited or has been detached, we no longer want to keep
track of it as using libpthread. Call this function to discard
thread_db related info related to PID. Note that this closes
/* When PID has exited or has been detached, we no longer want to keep
track of it as using libpthread. Call this function to discard
thread_db related info related to PID. Note that this closes
if (info == NULL)
return;
if (info == NULL)
return;
+ if (info->thread_agent != NULL && info->td_ta_delete_p != NULL)
+ {
+ td_err_e err = info->td_ta_delete_p (info->thread_agent);
+
+ if (err != TD_OK)
+ warning (_("Cannot deregister process %d from libthread_db: %s"),
+ pid, thread_db_err_str (err));
+ info->thread_agent = NULL;
+ }
+
if (info->handle != NULL)
dlclose (info->handle);
if (info->handle != NULL)
dlclose (info->handle);
/* These are not essential. */
TDB_DLSYM (info, td_thr_tls_get_addr);
TDB_DLSYM (info, td_thr_tlsbase);
/* These are not essential. */
TDB_DLSYM (info, td_thr_tls_get_addr);
TDB_DLSYM (info, td_thr_tlsbase);
+ TDB_DLSYM (info, td_ta_delete);
/* 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,
/* 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,
typedef td_err_e (td_ta_new_ftype) (struct ps_prochandle * ps,
td_thragent_t **ta);
typedef td_err_e (td_ta_new_ftype) (struct ps_prochandle * ps,
td_thragent_t **ta);
+typedef td_err_e (td_ta_delete_ftype) (td_thragent_t *ta_p);
typedef td_err_e (td_ta_map_lwp2thr_ftype) (const td_thragent_t *ta,
lwpid_t lwpid, td_thrhandle_t *th);
typedef td_err_e (td_ta_thr_iter_ftype) (const td_thragent_t *ta,
typedef td_err_e (td_ta_map_lwp2thr_ftype) (const td_thragent_t *ta,
lwpid_t lwpid, td_thrhandle_t *th);
typedef td_err_e (td_ta_thr_iter_ftype) (const td_thragent_t *ta,