Re: Potential bug in openjdk-11 on mips64el

Hi,

This particular exception is being thrown by the call to unlinkat [1]
which calls native unlinkat. Man page for unlinkat describes EISDIR
error [2] as:
"EISDIR pathname refers to a directory, and AT_REMOVEDIR was not
specified in flags."

Assuming unlinkat is telling the truth and this is indeed a directory,
it can be seen from the stacktrace that deleteRecursivelySecure is
calling deleteFile [3] instead of deleteDir (deleteDir does set
AT_REMOVERDIR).

This seems to indicate that the isDirectory call [4] is getting wrong
file attributes. Following the trail, those file attributes come from
a fstatat call [5] which ultimately come from the native stack in
UnixNativeDispatcher.c [6]. The actual way that fstatat is called
depends on the build flags and defines from the arch, so somebody with
better knowledge might want to take a look at UnixNativeDispatcher.c
[6] and tell if OpenJDK is picking the right function to call for
mips64el.

References:
[1] unlinkat call
https://sources.debian.org/src/openjdk-11/11.0.10+9-1/src/java.base/unix/classes/sun/nio/fs/UnixSecureDirectoryStream.java/#L200
[2] EISDIR in OpenJDK:
https://sources.debian.org/src/openjdk-11/11.0.10+9-1/src/hotspot/share/runtime/os.cpp/#L1504
[3] https://salsa.debian.org/java-team/guava-libraries/-/blob/master/guava/src/com/google/common/io/MoreFiles.java#L630
[4] https://salsa.debian.org/java-team/guava-libraries/-/blob/master/guava/src/com/google/common/io/MoreFiles.java#L335
[5] https://sources.debian.org/src/openjdk-11/11.0.10+9-1/src/java.base/unix/classes/sun/nio/fs/UnixFileAttributes.java/#L90


cheers,

-- 
Tiago Stürmer Daitx
Software Engineer
[email protected]

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