diff --git a/meta-networking/recipes-connectivity/openthread/ot-br-posix/0001-posix-backtrace-Reference-sCrashCallback-on-non-gli.patch b/meta-networking/recipes-connectivity/openthread/ot-br-posix/0001-posix-backtrace-Reference-sCrashCallback-on-non-gli.patch
new file mode 100644
index 0000000000..88c3b67314
--- /dev/null
+++ b/meta-networking/recipes-connectivity/openthread/ot-br-posix/0001-posix-backtrace-Reference-sCrashCallback-on-non-gli.patch
@@ -0,0 +1,34 @@
+From: Khem Raj <khem.raj@oss.qualcomm.com>
+Date: Tue, 29 Sep 2026 01:57:51 +0000
+Subject: [PATCH] posix/backtrace: Reference sCrashCallback on non-glibc,
+ non-Android builds
+
+sCrashCallback is set unconditionally by otSysRegisterCrashCallback()
+whenever OPENTHREAD_POSIX_CONFIG_BACKTRACE_ENABLE is set, but it is
+only read from signalCritical(), which is compiled solely under the
+`OPENTHREAD_POSIX_CONFIG_ANDROID_ENABLE || defined(__GLIBC__)` branch.
+On musl (neither Android nor glibc) that branch is replaced by an
+empty platformBacktraceInit() stub, so the variable is set but never
+used, which clang's -Wunused-but-set-global (promoted to -Werror)
+turns into a hard build failure. Use the existing OT_UNUSED_VARIABLE()
+idiom already used elsewhere in this file (e.g. in signalCritical())
+to acknowledge the variable on this code path too.
+
+Upstream-Status: Pending
+Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>
+---
+ src/posix/platform/backtrace.cpp | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/posix/platform/backtrace.cpp b/src/posix/platform/backtrace.cpp
+index 1111111..2222222 100644
+--- a/src/posix/platform/backtrace.cpp
++++ b/src/posix/platform/backtrace.cpp
+@@ -185,6 +185,6 @@ void platformBacktraceInit(void)
+     }
+ }
+ #else  // OPENTHREAD_POSIX_CONFIG_ANDROID_ENABLE || defined(__GLIBC__)
+-void platformBacktraceInit(void) {}
++void platformBacktraceInit(void) { OT_UNUSED_VARIABLE(sCrashCallback); }
+ #endif // OPENTHREAD_POSIX_CONFIG_ANDROID_ENABLE || defined(__GLIBC__)
+ #endif // OPENTHREAD_POSIX_CONFIG_BACKTRACE_ENABLE
diff --git a/meta-networking/recipes-connectivity/openthread/ot-br-posix_git.bb b/meta-networking/recipes-connectivity/openthread/ot-br-posix_git.bb
index 8c49a30327..59e1dae2a3 100644
--- a/meta-networking/recipes-connectivity/openthread/ot-br-posix_git.bb
+++ b/meta-networking/recipes-connectivity/openthread/ot-br-posix_git.bb
@@ -17,6 +17,7 @@ SRC_URI = "gitsm://github.com/openthread/ot-br-posix.git;protocol=https;branch=m
            file://0001-cmake-Disable-nonnull-compare-warning-on-gcc.patch \
            file://default-cxx-std.patch \
            file://0001-x509_crt-Zero-initialize-mbedtls_x509_time-at-declar.patch;patchdir=third_party/openthread/repo \
+           file://0001-posix-backtrace-Reference-sCrashCallback-on-non-gli.patch;patchdir=third_party/openthread/repo \
            "

 SYSTEMD_SERVICE:${PN} = "otbr-agent.service"