The branch stable/12 has been updated by kib:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=ce8a17c2ba6cb1dba49d25c70b91ff8203ad816c

commit ce8a17c2ba6cb1dba49d25c70b91ff8203ad816c
Author:     Konstantin Belousov <[email protected]>
AuthorDate: 2021-04-09 23:23:54 +0000
Commit:     Konstantin Belousov <[email protected]>
CommitDate: 2021-05-01 00:38:29 +0000

    amd64: clear debug registers on execing 32bit native binary
    
    (cherry picked from commit d50adfec9ee73e88e8d365525f1acef2c1db798a)
---
 sys/amd64/ia32/ia32_signal.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/amd64/ia32/ia32_signal.c b/sys/amd64/ia32/ia32_signal.c
index 72f35af75b85..4342d6fb807d 100644
--- a/sys/amd64/ia32/ia32_signal.c
+++ b/sys/amd64/ia32/ia32_signal.c
@@ -971,6 +971,8 @@ ia32_setregs(struct thread *td, struct image_params *imgp, 
u_long stack)
        regs->tf_gs = _ugssel;
        regs->tf_flags = TF_HASSEGS;
 
+       x86_clear_dbregs(pcb);
+
        fpstate_drop(td);
 
        /* Return via doreti so that we can change to a different %cs */
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