Unable to load libjava.so in fakechroot

[Robin McCorkell]

When running java inside a chroot run through fakechroot, initialization fails with the following messages (assuming chroot is set up at /var/lib/foo/chroot):

OpenJDK 64-Bit Server VM warning: No monotonic clock was available - timed services may be adversely affected if the time-of-day clock changes
Error occurred during initialization of VM
Unable to load native library: /var/lib/foo/chroot/var/libjava.so: cannot open shared object file: No such file or directory

The path is completely wrong, since although it contains the path to the chroot the library location is [chroot]/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/libjava.so, not [chroot]/var/libjava.so. I turned on fakechroot debugging to test this - there is a realpath command being called with the correct path, but the following stat's and fopen's are completely wrong:

fakechroot: realpath("/var/lib/foo/chroot/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/server/libjvm.so", &resolved)
fakechroot: __lxstat64_rel(1, "/var", &buf)
fakechroot: __lxstat64_rel(1, "/var/lib", &buf)
fakechroot: __lxstat64_rel(1, "/var/lib/foo", &buf)
fakechroot: fopen("/var/libverify.so", "r")
fakechroot: rel2abs("/var/libverify.so", &resolved)
fakechroot: rel2abs("/var/libverify.so", "/var/libverify.so")
fakechroot: dlopen("/var/libverify.so", 1)
fakechroot: rel2abs("/var/libverify.so", &resolved)
fakechroot: rel2abs("/var/libverify.so", "/var/libverify.so")
fakechroot: open("/var/libverify.so", 2048, ...)
fakechroot: rel2abs("/var/libverify.so", &resolved)
fakechroot: rel2abs("/var/libverify.so", "/var/libverify.so")
fakechroot: fopen("/var/libjava.so", "r")
fakechroot: rel2abs("/var/libjava.so", &resolved)
fakechroot: rel2abs("/var/libjava.so", "/var/libjava.so")
fakechroot: dlopen("/var/libjava.so", 1)
fakechroot: rel2abs("/var/libjava.so", &resolved)
fakechroot: rel2abs("/var/libjava.so", "/var/libjava.so")
fakechroot: open("/var/libjava.so", 2048, ...)
fakechroot: rel2abs("/var/libjava.so", &resolved)
fakechroot: rel2abs("/var/libjava.so", "/var/libjava.so")

Setting JAVA_HOME did not fix the issue, in fact the debug output showed nothing even changed.

This was seen on Ubuntu 14.04, package version 7u65-2.5.2-3~14.04 on amd64

[Robin McCorkell (xenopathic)]

Sorry, this isn't a problem with OpenJDK but rather with fakechroot not implementing dladdr and dl_iterate_phdr