Date: Wed, 14 Nov 2001 15:47:32 -0500 (EST) From: "Andrew Atrens" <atrens@nortelnetworks.com> To: hackers@freebsd.org Subject: linux JVMs not handling SEGV well. Message-ID: <20011114152822.G3841-100000@hcarp00g.ca.nortel.com>
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All, I'm using 4.x-stable, linux-base-6.x, and am encountering a lot of turbulence with both Sun's jdk1.3.x HotSpot JVM and IBM's linux jdk1.3.x JVM. I have a buggy 3rdparty java app that occasionally causes a null pointer exception to be thrown. While not fatal for the app (the exception is correctly caught), it's most often fatal for the JVM. The SUN jvm SEGV's ( doesn't correctly catch the SIGNAL ), while the IBM jvm seems to get locked in kernel mode - only responding to SIGKILL and chewing up tons of 'system' cpu time. The common denominator here is that both JITs utilize linux threads. When I use a non-threaded JIT, the problem doesn't occur. The problem is readily reproducible, but I'm not sure how to debug it. I've played with truss and ktrace, but I think it's time to begin thinking about using the kernel debugger. Anyone have suggestions on the best way to proceed ? Andrew. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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