cext GC collects classes and modules that are still in use
----------------------------------------------------------
Key: JRUBY-5690
URL: http://jira.codehaus.org/browse/JRUBY-5690
Project: JRuby
Issue Type: Bug
Components: C Extensions
Affects Versions: JRuby 1.6
Reporter: Aman Gupta
Assignee: Thomas E Enebo
Priority: Critical
I can repro this with the mysql gem.
{noformat}
require 'vendor/gems/jruby/1.8/gems/mysql-2.8.1/lib/mysql_api.bundle'
conn = Mysql.connect
num = 10_000
num.times do |i|
begin
print '.'
conn.query('select 1+2+3')
rescue Object => e
puts i
raise e
end
end
{noformat}
After 5k iterations, this results in an NPE:
{noformat}
RubyBasicObject.java:1595:in `ensureInstanceVariablesSettable':
java.lang.NullPointerException
from RubyBasicObject.java:1526:in `setInstanceVariable'
from Native.java:-2:in `callMethod1'
from NativeMethod1.java:48:in `call'
from CachingCallSite.java:137:in `call'
from mytest.rb:6:in `block_0$RUBY$__file__'
from mytest$block_0$RUBY$__file__:65535:in `call'
from CompiledBlock.java:112:in `yield'
from CompiledBlock.java:95:in `yield'
from Block.java:130:in `yield'
from RubyFixnum.java:252:in `times'
from RubyFixnum$i$0$0$times.gen:65535:in `call'
from CachingCallSite.java:272:in `cacheAndCall'
from CachingCallSite.java:114:in `callBlock'
from CachingCallSite.java:123:in `callIter'
from mytest.rb:3:in `__file__'
from mytest.rb:-1:in `load'
from Ruby.java:671:in `runScript'
from Ruby.java:575:in `runNormally'
from Ruby.java:424:in `runFromMain'
from Main.java:278:in `doRunFromMain'
from Main.java:198:in `internalRun'
from Main.java:164:in `run'
from Main.java:148:in `run'
from Main.java:128:in `main'
{noformat}
Or sometimes, a segfault.
{noformat}
Invalid memory access of location 0x8 rip=0x10109f2b7
Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x0000000000000008
[Switching to process 21473 thread 0xc13]
0x000000010109f2b7 in JVM_Lseek ()
(gdb) where
#0 0x000000010109f2b7 in JVM_Lseek ()
#1 0x000000010109ed77 in JVM_Lseek ()
#2 0x000000010109eb7a in JVM_Lseek ()
#3 0x00000001010c1af1 in JVM_FindLoadedClass ()
#4 0x000000010130e2ca in pss ()
#5 0x000000010b759b80 in JNIEnv_::CallStaticObjectMethodA ()
#6 0x000000010b759aae in rb_data_object_alloc ()
#7 0x000000010b7a90bd in mysqlres2obj (res=0x10da92890) at mysql.c:182
#8 0x000000010b7ab0b5 in store_result (obj=4319213104) at mysql.c:708
#9 0x000000010b7ab407 in query (obj=4319213104, sql=4524158320) at mysql.c:764
#10 0x000000010b75c632 in Java_org_jruby_cext_Native_callMethod1 ()
#11 0x0000000103811cc8 in ?? ()
#12 0x00000001038069b3 in ?? ()
#13 0x00000001038069b3 in ?? ()
#14 0x00000001038069b3 in ?? ()
#15 0x00000001038069b3 in ?? ()
#16 0x00000001038069b3 in ?? ()
#17 0x00000001038069b3 in ?? ()
#18 0x00000001038069b3 in ?? ()
#19 0x00000001038069b3 in ?? ()
#20 0x00000001038069b3 in ?? ()
#21 0x00000001038069b3 in ?? ()
#22 0x00000001038069b3 in ?? ()
#23 0x00000001038069b3 in ?? ()
#24 0x00000001038069b3 in ?? ()
#25 0x00000001038069b3 in ?? ()
#26 0x00000001038069b3 in ?? ()
#27 0x0000000103806e8d in ?? ()
#28 0x00000001038069b3 in ?? ()
#29 0x00000001038069b3 in ?? ()
#30 0x000000010380685a in ?? ()
#31 0x00000001038069b3 in ?? ()
#32 0x00000001038069b3 in ?? ()
#33 0x00000001038069b3 in ?? ()
#34 0x00000001038069b3 in ?? ()
#35 0x0000000103801438 in ?? ()
#36 0x000000010109eda7 in JVM_Lseek ()
#37 0x000000010109eb7a in JVM_Lseek ()
#38 0x00000001010c1af1 in JVM_FindLoadedClass ()
#39 0x00000001010c1999 in JVM_FindLoadedClass ()
#40 0x0000000100002d23 in ArgParser::setupMaxHeapAndStack ()
#41 0x0000000100003270 in ArgParser::setupMaxHeapAndStack ()
#42 0x00007fff88bd54f6 in _pthread_start ()
#43 0x00007fff88bd53a9 in thread_start ()
{noformat}
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