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Fix problem exposed by gdb.server/stop-reply-no-thread-multi.exp

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Running gdb.server/stop-reply-no-thread-multi.exp with "maint set
target-non-stop on" occasionally hit an internal error like this:

  ...
  continue
  Continuing.
  warning: multi-threaded target stopped without sending a thread-id, using first non-exited thread
  /home/pedro/gdb/binutils-gdb/src/gdb/inferior.c:291: internal-error: inferior* find_inferior_pid(process_stratum_target*, int): Assertion `pid != 0' failed.
  A problem internal to GDB has been detected,
  further debugging may prove unreliable.

  This is a bug, please report it.
  FAIL: gdb.server/stop-reply-no-thread-multi.exp: to_disable=Tthread: continue until exit (GDB internal error)

The backtrace looks like this:

 ...
   0x0000560357b0879c in internal_error (file=0x560357be6c18 "/home/pedro/gdb/binutils-gdb/src/gdb/inferior.c", line=291, fmt=0x560357be6b21 "%s: Assertion `%s' failed.") at /home/pedro/gdb/binutils-gdb/src/gdbsupport/errors.cc:55
   0x000056035762061b in find_inferior_pid (targ=0x5603596e9560, pid=0) at /home/pedro/gdb/binutils-gdb/src/gdb/inferior.c:291
   0x00005603576206e6 in find_inferior_ptid (targ=0x5603596e9560, ptid=...) at /home/pedro/gdb/binutils-gdb/src/gdb/inferior.c:305
   0x00005603577d43ed in remote_target::check_pending_events_prevent_wildcard_vcont (this=0x5603596e9560, may_global_wildcard=0x7fff84fb05f0) at /home/pedro/gdb/binutils-gdb/src/gdb/remote.c:7215
   0x00005603577d2a9c in remote_target::commit_resumed (this=0x5603596e9560) at /home/pedro/gdb/binutils-gdb/src/gdb/remote.c:6680
 ...

pid is 0 in this case because the queued event is a process exit event
with no pid associated:

 (top-gdb) p event->ws
 During symbol reading: .debug_line address at offset 0x563c9a is 0 [in module /home/pedro/gdb/binutils-gdb/build/gdb/gdb]
 $1 = {kind = TARGET_WAITKIND_EXITED, value = {integer = 0, sig = GDB_SIGNAL_0, related_pid = {m_pid = 0, m_lwp = 0, m_tid = 0}, execd_pathname = 0x0, syscall_number = 0}}
 (top-gdb)

This fixes it, and adds a "maint set target-non-stop on/off" axis to the testcase.

gdb/ChangeLog:

	* remote.c
	(remote_target::check_pending_events_prevent_wildcard_vcont):
	Check whether the event's ptid is not null_ptid before looking up
	the corresponding inferior.

gdb/testsuite/ChangeLog:

	* gdb.server/stop-reply-no-thread-multi.exp (run_test): Add
	"target_non_stop" parameter and use it.
	(top level): Add "maint set target-non-stop on/off" testing axis.

Change-Id: Ia30cf275305ee4dcbbd33f731534cd71d1550eaa
This commit is contained in:
Pedro Alves
2021-02-13 19:16:44 +00:00
parent 8592be8c7d
commit 323fd5b9f9
4 changed files with 33 additions and 8 deletions

7
gdb/ChangeLog

@ -1,3 +1,10 @@
2021-03-25 Pedro Alves <pedro@palves.net>
* remote.c
(remote_target::check_pending_events_prevent_wildcard_vcont):
Check whether the event's ptid is not null_ptid before looking up
the corresponding inferior.
2021-03-24 Changbin Du <changbin.du@gmail.com>
* riscv-tdep.c (riscv_breakpoint_kind_from_pc): Remove call to

6
gdb/remote.c

@ -7190,16 +7190,18 @@ remote_target::check_pending_events_prevent_wildcard_vcont
|| event->ws.kind == TARGET_WAITKIND_VFORKED)
*may_global_wildcard = 0;
struct inferior *inf = find_inferior_ptid (this, event->ptid);
/* This may be the first time we heard about this process.
Regardless, we must not do a global wildcard resume, otherwise
we'd resume this process too. */
*may_global_wildcard = 0;
if (event->ptid != null_ptid)
{
inferior *inf = find_inferior_ptid (this, event->ptid);
if (inf != NULL)
get_remote_inferior (inf)->may_wildcard_vcont = false;
}
}
}
/* Discard all pending stop replies of inferior INF. */

6
gdb/testsuite/ChangeLog

@ -1,3 +1,9 @@
2021-03-25 Pedro Alves <pedro@palves.net>
* gdb.server/stop-reply-no-thread-multi.exp (run_test): Add
"target_non_stop" parameter and use it.
(top level): Add "maint set target-non-stop on/off" testing axis.
2021-03-25 Andrew Burgess <andrew.burgess@embecosm.com>
* lib/ada.exp (gnat_runtime_has_debug_info): Use -wrap with

14
gdb/testsuite/gdb.server/stop-reply-no-thread-multi.exp

@ -41,10 +41,15 @@ if { [build_executable "failed to prepare" $testfile $srcfile {debug pthreads}]
}
# Run the tests with different features of GDBserver disabled.
proc run_test { disable_feature } {
# TARGET_NON_STOP is passed to "maint set target-non-stop".
proc run_test { target_non_stop disable_feature } {
global binfile gdb_prompt decimal hex
global GDBFLAGS
save_vars { GDBFLAGS } {
append GDBFLAGS " -ex \"maint set target-non-stop $target_non_stop\""
clean_restart ${binfile}
}
# Make sure we're disconnected, in case we're testing with an
# extended-remote board, therefore already connected.
@ -131,6 +136,11 @@ proc run_test { disable_feature } {
#
# T: Start GDBserver with the entire 'T' stop reply packet disabled,
# GDBserver will instead send the 'S' stop reply.
#
# Also test both all-stop and non-stop variants of the remote
# protocol.
foreach_with_prefix target-non-stop {"off" "on"} {
foreach_with_prefix to_disable { "" Tthread T } {
run_test $to_disable
run_test ${target-non-stop} $to_disable
}
}