From: John Baldwin <jhb@FreeBSD.org>
To: gdb-patches@sourceware.org
Subject: [PATCH 8/9] fbsd-nat: Fix thread_alive against a running thread.
Date: Tue, 28 Feb 2023 10:18:44 -0800 [thread overview]
Message-ID: <20230228181845.99936-9-jhb@FreeBSD.org> (raw)
In-Reply-To: <20230228181845.99936-1-jhb@FreeBSD.org>
FreeBSD's ptrace fails requests with EBUSY against a running process.
Report that the thread is alive instead of dead if ptrace fails with
EBUSY.
This fixes an internal error in the gdb.threads/detach-step-over.exp
test where one process was detached while a thread in a second process
was being stepped. The core incorrectly assumed the stepping thread
had vanished and discarded the pending stepping state. When the
thread later reported a SIGTRAP from completing the step, this
triggered an assertion.
---
gdb/fbsd-nat.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/gdb/fbsd-nat.c b/gdb/fbsd-nat.c
index e3d83cbf908..32dd482ec3c 100644
--- a/gdb/fbsd-nat.c
+++ b/gdb/fbsd-nat.c
@@ -861,7 +861,13 @@ fbsd_nat_target::thread_alive (ptid_t ptid)
if (ptrace (PT_LWPINFO, ptid.lwp (), (caddr_t) &pl, sizeof pl)
== -1)
- return false;
+ {
+ /* EBUSY means the associated process is running which means
+ the LWP does exist and belongs to a running process. */
+ if (errno == EBUSY)
+ return true;
+ return false;
+ }
#ifdef PL_FLAG_EXITED
if (pl.pl_flags & PL_FLAG_EXITED)
return false;
--
2.38.1
next prev parent reply other threads:[~2023-02-28 18:19 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-28 18:18 [PATCH 0/9] Fixes for multiprocess for FreeBSD's native target John Baldwin
2023-02-28 18:18 ` [PATCH 1/9] fbsd-nat: Add missing spaces John Baldwin
2023-03-20 17:43 ` Simon Marchi
2023-03-20 18:08 ` John Baldwin
2023-02-28 18:18 ` [PATCH 2/9] fbsd-nat: Avoid a direct write to target_waitstatus::kind John Baldwin
2023-03-20 17:45 ` Simon Marchi
2023-02-28 18:18 ` [PATCH 3/9] fbsd-nat: Use correct constant for target_waitstatus::sig John Baldwin
2023-03-20 17:47 ` Simon Marchi
2023-02-28 18:18 ` [PATCH 4/9] fbsd-nat: Add a list of pending events John Baldwin
2023-03-20 18:35 ` Simon Marchi
2023-03-27 20:24 ` John Baldwin
2023-03-27 20:57 ` Simon Marchi
2023-03-27 21:00 ` John Baldwin
2023-02-28 18:18 ` [PATCH 5/9] fbsd-nat: Defer any ineligible events reported by wait John Baldwin
2023-03-20 19:09 ` Simon Marchi
2023-03-27 20:49 ` John Baldwin
2023-03-27 21:04 ` Simon Marchi
2023-02-28 18:18 ` [PATCH 6/9] fbsd-nat: Fix resuming and waiting with multiple processes John Baldwin
2023-03-20 19:55 ` Simon Marchi
2023-03-27 21:13 ` John Baldwin
2023-02-28 18:18 ` [PATCH 7/9] fbsd-nat: Fix several issues with detaching John Baldwin
2023-02-28 18:18 ` John Baldwin [this message]
2023-02-28 18:18 ` [PATCH 9/9] fbsd-nat: Stop a process if it is running before killing it John Baldwin
2023-03-14 18:21 ` [PING] [PATCH 0/9] Fixes for multiprocess for FreeBSD's native target John Baldwin
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