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Fix "thread find" with multiple inferiors/targets (PR gdb/26631)

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"thread find" with multiple inferiors got broken with the multi-target
work:

 Thread 1 "gdb" hit Breakpoint 1, internal_error (...) at ../../src/gdbsupport/errors.cc:51
 51      {
 (top-gdb) bt
 #0  internal_error (file=0xffffd4d0 <error: Cannot access memory at address 0xffffd4d0>, line=0, fmt=0x555556330320 "en_US.UTF-8") at ../../src/gdbsupport/errors.cc:51
 #1  0x0000555555bca4c7 in target_thread_name (info=0x555556801290) at ../../src/gdb/target.c:2035
 #2  0x0000555555beb07a in thread_find_command (arg=0x7fffffffe08e "1", from_tty=0) at ../../src/gdb/thread.c:1959
 #3  0x000055555572ec49 in do_const_cfunc (c=0x555556786bc0, args=0x7fffffffe08e "1", from_tty=0) at ../../src/gdb/cli/cli-decode.c:95
 #4  0x0000555555732abd in cmd_func (cmd=0x555556786bc0, args=0x7fffffffe08e "1", from_tty=0) at ../../src/gdb/cli/cli-decode.c:2181
 #5  0x0000555555bf1245 in execute_command (p=0x7fffffffe08e "1", from_tty=0) at ../../src/gdb/top.c:664
 #6  0x00005555559cad10 in catch_command_errors (command=0x555555bf0c31 <execute_command(char const*, int)>, arg=0x7fffffffe082 "thread find 1", from_tty=0) at ../../src/gdb/main.c:457
 #7  0x00005555559cc33d in captured_main_1 (context=0x7fffffffdb60) at ../../src/gdb/main.c:1218
 #8  0x00005555559cc571 in captured_main (data=0x7fffffffdb60) at ../../src/gdb/main.c:1243
 #9  0x00005555559cc5e8 in gdb_main (args=0x7fffffffdb60) at ../../src/gdb/main.c:1268
 #10 0x0000555555623816 in main (argc=17, argv=0x7fffffffdc78) at ../../src/gdb/gdb.c:32

The problem is that we're not switching to the inferior/target before
calling target methods, which trips on an assertion put in place
exactly to catch this sort of problem.

gdb/testsuite/ChangeLog:

	PR gdb/26631
	* gdb.multi/multi-target-thread-find.exp: New file.

gdb/ChangeLog:

	PR gdb/26631
	* thread.c (thread_find_command): Switch inferior before calling
	target methods.
This commit is contained in:
Pedro Alves
2020-09-18 13:40:18 +01:00
parent e11daf7a2e
commit e8ef12b996
4 changed files with 123 additions and 0 deletions
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6
gdb/thread.c
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@ -1946,9 +1946,15 @@ thread_find_command (const char *arg, int from_tty)
if (tmp != 0)
error (_("Invalid regexp (%s): %s"), tmp, arg);
/* We're going to be switching threads. */
scoped_restore_current_thread restore_thread;
update_thread_list ();
for (thread_info *tp : all_threads ())
{
switch_to_inferior_no_thread (tp->inf);
if (tp->name != NULL && re_exec (tp->name))
{
printf_filtered (_("Thread %s has name '%s'\n"),