The branch stable/15 has been updated by kib:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=c2c3881f70acbd02baaa591497edc396323ae853

commit c2c3881f70acbd02baaa591497edc396323ae853
Author:     Konstantin Belousov <[email protected]>
AuthorDate: 2026-02-16 10:04:26 +0000
Commit:     Konstantin Belousov <[email protected]>
CommitDate: 2026-02-21 09:48:58 +0000

    pdrfork(2) tests: catch runaway child for EFAULT test
    
    (cherry picked from commit 44843695bc4e36abd15835d627da7d38c06f2219)
---
 tests/sys/kern/pdrfork.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tests/sys/kern/pdrfork.c b/tests/sys/kern/pdrfork.c
index 1003ad9dc746..943e7fde835a 100644
--- a/tests/sys/kern/pdrfork.c
+++ b/tests/sys/kern/pdrfork.c
@@ -95,11 +95,21 @@ ATF_TC_WITHOUT_HEAD(efault);
 ATF_TC_BODY(efault, tc)
 {
        void *unmapped;
+       pid_t my_pid;
 
        unmapped = mmap(NULL, PAGE_SIZE, PROT_NONE, MAP_GUARD, -1, 0);
        ATF_REQUIRE(unmapped != MAP_FAILED);
+       my_pid = getpid();
        ATF_REQUIRE_ERRNO(EFAULT, pdrfork(unmapped, 0, RFPROC |
            RFPROCDESC) < 0);
+
+       /*
+        * EFAULT only means that the copyout of the procdesc failed.
+        * The runaway child was created anyway.  Prevent
+        * double-destruction of the atf stuff.
+        */
+       if (my_pid != getpid())
+               _exit(0);
 }
 
 /* Invalid combinations of flags should return EINVAL */

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