diff --git a/include/zephyr/arch/posix/arch.h b/include/zephyr/arch/posix/arch.h
index 83aceb1c14ba1f..79e83bd9d928d5 100644
--- a/include/zephyr/arch/posix/arch.h
+++ b/include/zephyr/arch/posix/arch.h
@@ -17,6 +17,8 @@
 #ifndef ZEPHYR_INCLUDE_ARCH_POSIX_ARCH_H_
 #define ZEPHYR_INCLUDE_ARCH_POSIX_ARCH_H_
 
+#include <stdlib.h>
+
 /* Add include for DTS generated information */
 #include <zephyr/devicetree.h>
 
@@ -38,6 +40,53 @@ extern "C" {
 #define ARCH_STACK_PTR_ALIGN 4
 #endif
 
+/* "native_posix" should really use CONFIG_LOG_MODE_IMMEDIATE=y but better safe
+ * than sorry: debugging crashes is painful enough already, so try to be nice
+ * and flush all messages. The deferred logging code may also want to enjoy
+ * native_posix too.
+ *
+ * Other archs use Zephyr's elaborate "Fatal Errors" framework which takes care
+ * of flushing logs but native_posix is simpler so we have to do it ourselves.
+ */
+static inline void posix_arch_log_immediate(void)
+{
+#if defined(CONFIG_LOG) && !defined(CONFIG_LOG_MODE_MINIMAL)
+	/* We can't #include the higher-level "log_ctrl.h" in this low-level
+	 * file here because this descends into .h dependency hell.  So let's
+	 * use a one-line forward declaration instead. This void->void
+	 * prototype does not look like it's going to change much in the
+	 * future.
+	 *
+	 * We can't just declare "void log_panic(void);" here because system
+	 * calls are complicated. As ARCH_EXCEPT() can't be possibly used in
+	 * user mode, log_panic() is equivalent to just z_impl_log_panic().
+	 * Exceptionally invoke the latter directly.
+	 */
+	extern void z_impl_log_panic(void);
+	z_impl_log_panic();
+#endif
+}
+
+/* Copied from kernel.h */
+#define _EXCEPT_LOC() __ASSERT_PRINT("@ %s:%d\n", __FILE__, __LINE__)
+
+/* Invoked by k_panic() and k_oops().
+ *
+ * _EXCEPT_LOC() and "ZEPHYR FATAL ERROR" mimic z_fatal_error()
+ *
+ * Many [Z]TESTs invoke k_panic(). The test framework expects that to
+ * hang forever like hardware does; so don't exit / don't interfere.
+ */
+#if !defined(CONFIG_ZTEST) && !defined(CONFIG_TEST)
+#define ARCH_EXCEPT(reason_p) do { \
+	posix_arch_log_immediate(); \
+	_EXCEPT_LOC(); \
+	printk("ZEPHYR FATAL ERROR: %u\n", reason_p);  \
+	abort(); CODE_UNREACHABLE; \
+} while (false)
+#endif
+
+/* Exception context */
 struct __esf {
 	uint32_t dummy; /*maybe we will want to add something someday*/
 };
diff --git a/lib/libc/common/CMakeLists.txt b/lib/libc/common/CMakeLists.txt
index 4b101d8b84bdc9..a34bec49310164 100644
--- a/lib/libc/common/CMakeLists.txt
+++ b/lib/libc/common/CMakeLists.txt
@@ -4,10 +4,18 @@ zephyr_system_include_directories(include)
 
 zephyr_library()
 zephyr_library_property(ALLOW_EMPTY TRUE)
+
+# This abort.c is only a shim for k_panic(), which in posix/arch.h ends
+# up calling...  abort()! Break that cycle and use the real POSIX
+# abort().
+if(NOT CONFIG_ARCH_POSIX)
 zephyr_library_sources_ifdef(CONFIG_COMMON_LIBC_ABORT source/stdlib/abort.c)
+endif()
+
 zephyr_library_sources_ifdef(CONFIG_COMMON_LIBC_TIME source/time/time.c)
 zephyr_library_sources_ifdef(CONFIG_COMMON_LIBC_MALLOC source/stdlib/malloc.c)
 zephyr_library_sources_ifdef(CONFIG_COMMON_LIBC_STRNLEN source/string/strnlen.c)
+
 zephyr_library_sources_ifdef(CONFIG_COMMON_LIBC_THRD
     source/thrd/cnd.c
     source/thrd/mtx.c
diff --git a/tests/lib/c_lib/common/src/main.c b/tests/lib/c_lib/common/src/main.c
index 986dba55f8e917..3d2ffeb70cab86 100644
--- a/tests/lib/c_lib/common/src/main.c
+++ b/tests/lib/c_lib/common/src/main.c
@@ -1220,7 +1220,8 @@ ZTEST(libc_common, test_rand_reproducibility)
  */
 ZTEST(libc_common, test_abort)
 {
-#ifdef CONFIG_EXTERNAL_LIBC
+/* posix/arch.h uses a real abort() too */
+#if defined(CONFIG_EXTERNAL_LIBC) || defined(CONFIG_ARCH_POSIX)
 	ztest_test_skip();
 #else
 	int a = 0;