Expected: When you switch to a different JDK build, -XX:+AutoCreateSharedArchive should automatically update the specified dynamic CDS archive to match the new JDK.

Actual: the new JDK fails to load the base archive, and thus is unable to generate the dynamic archive.

=================================
$ rm -f /tmp/foo.jsa
$ /mybld/java/images/jdk/bin/java -Xlog:cds -Xlog:cds+map=debug:file=cds.map:none:filesize=0 -XX:+AutoCreateSharedArchive -cp ~/tmp/HelloWorld.jar -XX:SharedArchiveFile=/tmp/foo.jsa HelloWorld
[0.001s][info][cds] UseSharedSpaces: Specified shared archive not found (/tmp/foo.jsa)
[0.008s][info][cds] trying to map /mybld/java/images/jdk/lib/server/classes.jsa
[0.008s][info][cds] Opened archive /mybld/java/images/jdk/lib/server/classes.jsa.
[0.008s][info][cds] Archive was created with UseCompressedOops = 1, UseCompressedClassPointers = 1
[0.008s][info][cds] Core region alignment: 4096
[0.008s][info][cds] Reserved archive_space_rs [0x0000000800000000 - 0x0000000801000000] (16777216) bytes
[0.008s][info][cds] Reserved class_space_rs [0x0000000801000000 - 0x0000000841000000] (1073741824) bytes
[0.008s][info][cds] Mapped static region #0 at base 0x0000000800000000 top 0x000000080046f000 (ReadWrite)
[0.008s][info][cds] Mapped static region #1 at base 0x000000080046f000 top 0x0000000800c42000 (ReadOnly)
[0.008s][info][cds] CDS archive was created with max heap size = 128M, and the following configuration:
[0.008s][info][cds] narrow_klass_base = 0x0000000800000000, narrow_klass_shift = 0
[0.008s][info][cds] narrow_oop_mode = 0, narrow_oop_base = 0x0000000000000000, narrow_oop_shift = 0
[0.008s][info][cds] heap range = [0x00000000f8000000 - 0x0000000100000000]
[0.008s][info][cds] The current max heap size = 16088M, HeapRegion::GrainBytes = 8388608
[0.008s][info][cds] narrow_klass_base = 0x0000000800000000, narrow_klass_shift = 0
[0.008s][info][cds] narrow_oop_mode = 1, narrow_oop_base = 0x0000000000000000, narrow_oop_shift = 3
[0.008s][info][cds] heap range = [0x0000000412800000 - 0x0000000800000000]
[0.008s][info][cds] CDS heap data needs to be relocated because the archive was created with an incompatible oop encoding mode.
[0.008s][info][cds] CDS heap data relocation delta = 30064771072 bytes
[0.008s][info][cds] CDS heap data needs to be relocated lower by a further 7340032 bytes to 30057431040 to be aligned with HeapRegion::GrainBytes
[0.008s][info][cds] Mapped static region #2 at base 0x00007f3a24080000 top 0x00007f3a240b9000 (Bitmap)
[0.008s][info][cds] Trying to map heap data: region[3] at 0x00000007ff800000, size = 528384 bytes
[0.008s][info][cds] Trying to map heap data: region[5] at 0x00000007ff700000, size = 487424 bytes
[0.008s][info][cds] optimized module handling: enabled
[0.008s][info][cds] full module graph: enabled
[0.008s][info][cds] use_full_module_graph = true; java.base = 0x0000000800469208
[0.008s][info][cds] patching heap embedded pointers
[0.010s][info][cds] Unmapping region #2 at base 0x00007f3a24080000 (Bitmap)
Hello World
[0.042s][info][cds] Regenerate MethodHandle Holder classes...
[.....]
[0.176s][info][cds] Dumping shared data to file:
[0.176s][info][cds] /tmp/foo.jsa
[0.176s][info][cds] Shared file region (rw ) 0: 45936 bytes, addr 0x0000000800c42000 file offset 0x00001000 crc 0xabcded7d
[0.176s][info][cds] Shared file region (ro ) 1: 57616 bytes, addr 0x0000000800c4e000 file offset 0x0000d000 crc 0xbc845f02
[0.176s][info][cds] Shared file region (bm ) 2: 1672 bytes, addr 0x0000000000000000 file offset 0x0001c000 crc 0xa045a902

$ /mybld/java-fastdebug/images/jdk/bin/java -Xlog:cds -XX:+AutoCreateSharedArchive -cp ~/tmp/HelloWorld.jar -XX:SharedArchiveFile=/tmp/foo.jsa HelloWorld
[0.046s][info][cds] trying to map /mybld/java/images/jdk/lib/server/classes.jsa
[0.046s][info][cds] Opened archive /mybld/java/images/jdk/lib/server/classes.jsa.
[0.046s][info][cds] _jvm_ident expected: Java HotSpot(TM) 64-Bit Server VM (fastdebug 19-internal-adhoc.iklam.src) for linux-amd64 JRE (19-internal-adhoc.iklam.src), built on Jun 6 2022 20:46:08 by "iklam" with gcc 10.3.0
[0.046s][info][cds] actual: Java HotSpot(TM) 64-Bit Server VM (19-internal-adhoc.iklam.src) for linux-amd64 JRE (19-internal-adhoc.iklam.src), built on Jun 6 2022 20:38:06 by "iklam" with gcc 10.3.0
[0.046s][info][cds] UseSharedSpaces: The shared archive file was created by a different version or build of HotSpot
[0.046s][info][cds] UseSharedSpaces: Initialize static archive failed.
[0.046s][info][cds] UseSharedSpaces: Unable to map shared spaces
Hello World

=================================
The problem is here:

$ head -8 cds.map
Dynamic CDS archive map for /tmp/foo.jsa
[header 0x0000000000000000 - 0x00000000000003f8 1016 bytes]
- magic: 0xf00baba8
- crc: 0x0ac363f5
- version: 14
- header_size: 1016
- base_archive_name_offset: 968
- base_archive_name_size: 48

According to https://github.com/openjdk/jdk/blob/master/src/hotspot/share/include/cds.h#L72

base_archive_name_offset and base_archive_name_size should both be zero to indicate that /tmp/foo.jsa is generated using the default CDS archive.