Exception on using hotspot compiler

Fri Jun 17 12:42:55 UTC 2016

Hello everyone,

We are running a tomcat 6 on server with Java 8 on ARM device:

root at phyFLEX-i:~ uname -a
Linux phyFLEX-i.MX6 3.0.43-tpcom_run2-PD13.2.4 #1 SMP PREEMPT Fri Jun 10 11:55:37 CEST 2016 armv7l GNU/Linux

root at phyFLEX-i:/usr/tomcat/lib  /usr/java/ejre1.8.0_65/bin/java -cp catalina.jar org.apache.catalina.util.ServerInfo
Server version: Apache Tomcat/6.0.36
Server built:   Oct 16 2012 09:59:09
Server number:  6.0.36.0
OS Name:        Linux
OS Version:     3.0.43-tpcom_run2-PD13.2.4
Architecture:   arm
JVM Version:    1.8.0_65-b17
JVM Vendor:     Oracle Corporation

root at phyFLEX-i:~ /usr/java/ejre1.8.0_65/bin/java -version
java version "1.8.0_65"
Java(TM) SE Embedded Runtime Environment (build 1.8.0_65-b17, headless)
Java HotSpot(TM) Embedded Client VM (build 25.65-b01, mixed mode)

During work of the application there are bunch of error constantly appear in the dmesg log: unhandled page fault and undefined instructions. Yet the application on tomcat works correctly.

With _JAVA_OPTIONS -Xint there is no exception at all.
With _JAVA_OPTIONS -Xcomp there are even more of them
With _JAVA_OPTIONS -Xcomp -Xbatch returns the same result as -XComp

Here is the sample of undefined instructions:
[ 1929.280395] Code: e590c004 e15c0008 0a000000 eaf2da0f (e7f000f0)
[ 1929.299220] java (2566): undefined instruction: pc=2b7504c0
[ 1929.304821] Code: e590c004 e15c0008 0a000000 eaf2adef (e7f000f0)
[ 1929.328355] java (2566): undefined instruction: pc=2b7504c0
[ 1929.334510] Code: e590c004 e15c0008 0a000000 eaf2adef (e7f000f0)
[ 1929.342659] java (2566): undefined instruction: pc=2b7412c0
[ 1929.348784] Code: e590c004 e15c0008 0a000000 eaf2ea6f (e7f000f0)
[ 1929.355993] java (2566): undefined instruction: pc=2b7412c0
[ 1929.362188] Code: e590c004 e15c0008 0a000000 eaf2ea6f (e7f000f0)
[ 1929.375402] java (2566): undefined instruction: pc=2b7412c0
[ 1929.381460] Code: e590c004 e15c0008 0a000000 eaf2ea6f (e7f000f0)
[ 1929.388276] java (2566): undefined instruction: pc=2b7412c0
[ 1929.393876] Code: e590c004 e15c0008 0a000000 eaf2ea6f (e7f000f0)

Here is the sample fot he unhandled page fault:
[  161.903357] java: unhandled page fault (11) at 0x00000004, code 0x017
[  161.903378] pgd = 9b010000
[  161.906101] [00000004] *pgd=2aeae831, *pte=00000000, *ppte=00000000
[  161.912523]
[  161.914028] Pid: 1945, comm:                 java
[  161.918798] CPU: 0    Not tainted  (3.0.43-tpcom_run2-PD13.2.4 #1)
[  161.925000] PC is at 0x2b401a28
[  161.928203] LR is at 0x2b3f39b4
[  161.931363] pc : [<2b401a28>]    lr : [<2b3f39b4>]    psr: 40000010
[  161.931369] sp : 2b385074  ip : 2b2b6e6c  fp : 2b385098
[  161.942921] r10: 00017800  r9 : 32bf46d8  r8 : 2b3850a0
[  161.948208] r7 : 32bf46b3  r6 : 2b2b9058  r5 : 32bf5988  r4 : 00000000
[  161.954753] r3 : 70000001  r2 : 00000000  r1 : 00000007  r0 : 00000000
[  161.961343] Flags: nZcv  IRQs on  FIQs on  Mode USER_32  ISA ARM  Segment user
[  161.968629] Control: 10c53c7d  Table: 2b01004a  DAC: 00000015
[  161.974415] [<80356cb8>] (show_regs+0x0/0x50) from [<80362538>] (__do_user_fault+0x9c/0xa8)
[  161.982860]  r4:9b0607c0 r3:8004d4e8
[  161.989245] [<8036249c>] (__do_user_fault+0x0/0xa8) from [<80362774>] (do_page_fault+0x230/0x3a8)
[  161.998181]  r7:00000004 r6:9b0607c0 r5:9a7289c0 r4:9b083fb0
[  162.003964] [<80362544>] (do_page_fault+0x0/0x3a8) from [<8034f4b8>] (do_DataAbort+0x3c/0x248)
[  162.012656] [<8034f47c>] (do_DataAbort+0x0/0x248) from [<80355a08>] (ret_from_exception+0x0/0x40)
[  162.021591] Exception stack(0x9b083fb0 to 0x9b083ff8)
[  162.026662] 3fa0:                                     00000000 00000007 00000000 70000001
[  162.034909] 3fc0: 00000000 32bf5988 2b2b9058 32bf46b3 2b3850a0 32bf46d8 00017800 2b385098
[  162.043288] 3fe0: 2b2b6e6c 2b385074 2b3f39b4 2b401a28 40000010 ffffffff

There are less exceptions when tomcat is run without application.

There is no exception if I am running Hello World application (which mean System.out should not get the blame.

Is it possible to set up some runtime globals http://hg.openjdk.java.net/jdk8u/jdk8u-dev/hotspot/file/cf1faa9100dd/src/share/vm/runtime/globals.hpp to avoid or mitigate such crashes?

How can the instruction that leads to exception on hotspot be retrieved?

Kind regards,
    Borys Lebeda
Luxoft Ukraine

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