The branch main has been updated by kib:
URL:
https://cgit.FreeBSD.org/src/commit/?id=68d311b66678d9daffc5cf1c78f3101f2eeec3ea
commit 68d311b66678d9daffc5cf1c78f3101f2eeec3ea
Author: Konstantin Belousov <k...@freebsd.org>
AuthorDate: 2021-04-24 12:02:40 +0000
Commit: Konstantin Belousov <k...@freebsd.org>
CommitDate: 2021-05-03 16:18:25 +0000
ptracestop: mark threads suspended there with the new TDB_SSWITCH flag
This way threads in ptracestop can be discovered by debugger
Reviewed by: markj
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D29955
---
sys/kern/kern_sig.c | 2 ++
sys/sys/proc.h | 1 +
2 files changed, 3 insertions(+)
diff --git a/sys/kern/kern_sig.c b/sys/kern/kern_sig.c
index 46b520030dcd..445582a176c8 100644
--- a/sys/kern/kern_sig.c
+++ b/sys/kern/kern_sig.c
@@ -2648,7 +2648,9 @@ ptracestop(struct thread *td, int sig, ksiginfo_t *si)
td->td_dbgflags &= ~TDB_STOPATFORK;
}
stopme:
+ td->td_dbgflags |= TDB_SSWITCH;
thread_suspend_switch(td, p);
+ td->td_dbgflags &= ~TDB_SSWITCH;
if (p->p_xthread == td)
p->p_xthread = NULL;
if (!(p->p_flag & P_TRACED))
diff --git a/sys/sys/proc.h b/sys/sys/proc.h
index e02e97d74229..b959681e992b 100644
--- a/sys/sys/proc.h
+++ b/sys/sys/proc.h
@@ -485,6 +485,7 @@ do {
\
#define TDB_VFORK 0x00000800 /* vfork indicator for ptrace() */
#define TDB_FSTP 0x00001000 /* The thread is PT_ATTACH leader */
#define TDB_STEP 0x00002000 /* (x86) PSL_T set for PT_STEP */
+#define TDB_SSWITCH 0x00004000 /* Suspended in ptracestop */
/*
* "Private" flags kept in td_pflags:
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