RFR: 8201616: Hotspot crashes on linux-sparc after 8189941 (original) (raw)
John Paul Adrian Glaubitz glaubitz at physik.fu-berlin.de
Tue Apr 17 19:48:33 UTC 2018
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Hi!
After having rebuilt OpenJDK several dozen times over several days and bisecting for several hours today, I finally found the culprit for the segfault I am seeing on linux-sparc which is JDK-8189941 [1].
Looking at the SPARC-specific changes [2], I noticed the change in os_solaris_sparc.cpp to use os::is_poll_address() instead of os::get_polling_page() when a SIGSEGV is caught which was missing in os_linux_sparc.cpp.
Thus, I made that change to os_linux_sparc.cpp as well:
diff --git a/src/hotspot/os_cpu/linux_sparc/os_linux_sparc.cpp b/src/hotspot/os_cpu/linux_sparc/os_linux_sparc.cpp --- a/src/hotspot/os_cpu/linux_sparc/os_linux_sparc.cpp +++ b/src/hotspot/os_cpu/linux_sparc/os_linux_sparc.cpp @@ -374,7 +374,7 @@ }
inline static bool checkPollingPage(address pc, address fault, address* stub) {
- if (fault == os::get_polling_page()) {
- if (os::is_poll_address(fault)) { *stub = SharedRuntime::get_poll_stub(pc); return true; }
And voila, the crash is gone \o/.
Please review the change in [3] and invite me over a cold one at next FOSDEM :-).
Cheers, Adrian
[1] http://hg.openjdk.java.net/jdk/jdk/rev/0ce0ac68ace7 [2] http://hg.openjdk.java.net/jdk/jdk/rev/0ce0ac68ace7#l39.1 [3] http://cr.openjdk.java.net/~glaubitz/8201616/webrev.00/
--
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