git: 21ccba43f511 - stable/13 - ptrace: Clear TDB_BORN during PT_DETACH.

The branch stable/13 has been updated by jhb:

URL: https://cgit.FreeBSD.org/src/commit/?id=21ccba43f511cc4089899619b5a85e6d83a200dc

commit 21ccba43f511cc4089899619b5a85e6d83a200dc
Author:     John Baldwin <jhb@FreeBSD.org>
AuthorDate: 2023-06-07 19:26:57 +0000
Commit:     John Baldwin <jhb@FreeBSD.org>
CommitDate: 2023-09-06 21:56:09 +0000

    ptrace: Clear TDB_BORN during PT_DETACH.
    
    If a debugger detaches from a process that has a new thread that has
    not yet executed, the new thread will raise a SIGTRAP signal to report
    it's thread birth event even after the detach.  With the debugger
    detached, this results in a SIGTRAP sent to the process and typically
    a core dump.  Fix this by clearing TDB_BORN from any new threads
    during detach.
    
    Bump __FreeBSD_version for debuggers to notice when the fix is
    present.
    
    Reported by:    GDB's testsuite
    Reviewed by:    kib, markj (previous version)
    Differential Revision:  https://reviews.freebsd.org/D39856
    
    (cherry picked from commit 653738e895ba022be1179a95a85089e7bc66dbbe)
---
 sys/kern/kern_fork.c   | 2 +-
 sys/kern/sys_process.c | 2 +-
 sys/sys/param.h        | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/sys/kern/kern_fork.c b/sys/kern/kern_fork.c
index 157eba2b3fbc..e3148763b460 100644
--- a/sys/kern/kern_fork.c
+++ b/sys/kern/kern_fork.c
@@ -1195,7 +1195,7 @@ fork_return(struct thread *td, struct trapframe *frame)
 			td->td_dbgflags &= ~TDB_STOPATFORK;
 		}
 		PROC_UNLOCK(p);
-	} else if (p->p_flag & P_TRACED || td->td_dbgflags & TDB_BORN) {
+	} else if (p->p_flag & P_TRACED) {
  		/*
 		 * This is the start of a new thread in a traced
 		 * process.  Report a system call exit event.
diff --git a/sys/kern/sys_process.c b/sys/kern/sys_process.c
index 6f53f1ae43b4..2eaeabb6a5f9 100644
--- a/sys/kern/sys_process.c
+++ b/sys/kern/sys_process.c
@@ -1288,7 +1288,7 @@ kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
 					    SIGSTOP);
 				}
 				td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP |
-				    TDB_SUSPEND);
+				    TDB_SUSPEND | TDB_BORN);
 			}
 
 			if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) {
diff --git a/sys/sys/param.h b/sys/sys/param.h
index 376d1aaa2187..ba64cfa4b5df 100644
--- a/sys/sys/param.h
+++ b/sys/sys/param.h
@@ -59,7 +59,7 @@
  *		in the range 5 to 9.
  */
 #undef __FreeBSD_version
-#define __FreeBSD_version 1302507	/* Master, propagated to newvers */
+#define __FreeBSD_version 1302508	/* Master, propagated to newvers */
 
 /*
  * __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD,