From: Pedro Alves <pedro@palves.net>
To: gdb-patches@sourceware.org
Subject: [PATCH 3/3] Fix problem exposed by gdb.server/stop-reply-no-thread-multi.exp
Date: Mon, 15 Mar 2021 23:43:39 +0000 [thread overview]
Message-ID: <20210315234339.457551-4-pedro@palves.net> (raw)
In-Reply-To: <20210315234339.457551-1-pedro@palves.net>
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:
...
#5 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
#6 0x000056035762061b in find_inferior_pid (targ=0x5603596e9560, pid=0) at /home/pedro/gdb/binutils-gdb/src/gdb/inferior.c:291
#7 0x00005603576206e6 in find_inferior_ptid (targ=0x5603596e9560, ptid=...) at /home/pedro/gdb/binutils-gdb/src/gdb/inferior.c:305
#8 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
#9 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.
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.
Change-Id: Ia30cf275305ee4dcbbd33f731534cd71d1550eaa
---
gdb/remote.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/gdb/remote.c b/gdb/remote.c
index ae15f416153..a752bd9a4cc 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -7164,14 +7164,16 @@ 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 (inf != NULL)
- get_remote_inferior (inf)->may_wildcard_vcont = false;
+ if (event->ptid != null_ptid)
+ {
+ inferior *inf = find_inferior_ptid (this, event->ptid);
+ if (inf != NULL)
+ get_remote_inferior (inf)->may_wildcard_vcont = false;
+ }
}
}
--
2.26.2
next prev parent reply other threads:[~2021-03-15 23:43 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-15 23:43 [PATCH 0/3] Fix gdbserver + "maint set target-non-stop" problems Pedro Alves
2021-03-15 23:43 ` [PATCH 1/3] Fix any_thread_of_inferior Pedro Alves
2021-03-17 15:14 ` Simon Marchi
2021-03-19 19:37 ` Pedro Alves
2021-03-15 23:43 ` [PATCH 2/3] Fix bkpt-other-inferior.exp race Pedro Alves
2021-03-17 15:12 ` Simon Marchi
2021-03-19 19:11 ` Pedro Alves
2021-03-25 17:24 ` Simon Marchi
2021-03-15 23:43 ` Pedro Alves [this message]
2021-03-17 15:27 ` [PATCH 3/3] Fix problem exposed by gdb.server/stop-reply-no-thread-multi.exp Simon Marchi
2021-03-19 19:32 ` Pedro Alves
2021-03-25 17:25 ` Simon Marchi
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