On Fri, 6 Feb 2026 15:39:13 GMT, Yasumasa Suenaga <[email protected]> wrote:
> We fixed mixed jstack failure when the call stack has frame in vDSO like > `gettimeofday()` in > [JDK-8376269](https://bugs.openjdk.org/browse/JDK-8376269). But it has been > backouted due to build error (see > [JDK-8377365](https://bugs.openjdk.org/browse/JDK-8377365) for details). > > JDK-8376269 uses `memfd_create` to copy vDSO from coredump to temporal > memory, however it cannot be used on older glibc - some CI works on glibc > 2.12, it does not have `memfd_create` unfortunately. > > Thus this PR proposes to use `tmpfile()` and `fileno()` to copy vDSO, as > alternatives of `memfd_create()`. It works, and passed all serviceability/sa > tests on Linux AMD64. > > Changes from JDK-8376269 is > https://github.com/openjdk/jdk/commit/0c315303865efe60de54276bbcf2faf174fd1d9b > . I'm seeing the following failure on linux-x64-debug: Opening core file, please wait... hsdb> ERROR: address conflict @ 0x7ffe43ff4000 (existing map size = 8192, size = 3701, flags = 5) ERROR: can't read shared object's segments ERROR: failed to read libraries The core file fails to attach as a result of this. ------------- PR Comment: https://git.openjdk.org/jdk/pull/29610#issuecomment-3861861136
