git: 8bfb456eafd3 - main - arm64: Raise a SIGILL if we fail reading an insn

The branch main has been updated by andrew:

URL: https://cgit.FreeBSD.org/src/commit/?id=8bfb456eafd34e2de89d2fb77af7a1d34474ca0d

commit 8bfb456eafd34e2de89d2fb77af7a1d34474ca0d
Author:     Andrew Turner <andrew@FreeBSD.org>
AuthorDate: 2025-05-12 11:04:05 +0000
Commit:     Andrew Turner <andrew@FreeBSD.org>
CommitDate: 2025-05-12 11:04:05 +0000

    arm64: Raise a SIGILL if we fail reading an insn
    
    When reading an instruction we may fail if another thread is unmapping
    a page while the current thread is executing from it. In this case
    raise a SIGILL rather than panicing the kernel.
    
    Reviewed by:    harry.moulton_arm.com
    Sponsored by:   Arm Ltd
    Differential Revision:  https://reviews.freebsd.org/D50203
---
 sys/arm64/arm64/undefined.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sys/arm64/arm64/undefined.c b/sys/arm64/arm64/undefined.c
index c307281ea523..cdd2a083ec17 100644
--- a/sys/arm64/arm64/undefined.c
+++ b/sys/arm64/arm64/undefined.c
@@ -322,8 +322,9 @@ undef_insn(u_int el, struct trapframe *frame)
 
 	if (el == 0) {
 		ret = fueword32((uint32_t *)frame->tf_elr, &insn);
+		/* Raise a SIGILL if we are unable to read the instruction */
 		if (ret != 0)
-			panic("Unable to read userspace faulting instruction");
+			return (0);
 	} else {
 		insn = *(uint32_t *)frame->tf_elr;
 	}