Object#object_id (object_get_id) cause exception
Reported by Brian Ford | October 16th, 2007 @ 01:23 AM | in 1.0 preview
After a certain number of times, accessing #object_id will cause an exception. However, attempting to access it on a new object will succeed a certain number of times and then cause an exception.
sirb(eval):000> 1.upto(100) { |i| a = Array.new; p a.object_id }
262681
262689
--- snip ---
263465
263473
=> 1
sirb(eval):001> 1.upto(100) { |i| a = Array.new; p a.object_id }
Attempted to access field of non reference.
An exception has occurred:
Attempted to access field of non-reference (null pointer) (ArgumentError)
Backtrace:
main.__eval_script__ at (eval):1
Integer(Fixnum)#upto at kernel/core/integer.rb:24
main.__eval_script__ at (eval):1
CompiledMethod#activate at kernel/core/compiled_method.rb:110
main.__script__ at lib/bin/sirb.rb:133
main.load at kernel/core/compile.rb:78
main.require at kernel/core/compile.rb:129
Array#each at kernel/core/array.rb:549
Integer(Fixnum)#times at kernel/core/integer.rb:15
Array#each at kernel/core/array.rb:549
main.require at kernel/core/compile.rb:112
Array#each at kernel/core/array.rb:549
Integer(Fixnum)#times at kernel/core/integer.rb:15
Array#each at kernel/core/array.rb:549
main.require at kernel/core/compile.rb:111
main.__script__ at kernel/loader.rb:150
sirb(eval):002> Array.new.object_id
=> 264161
sirb(eval):003> 1.upto(100) { |i| a = Array.new; p a.object_id }
Attempted to access field of non reference.
An exception has occurred:
Attempted to access field of non-reference (null pointer) (ArgumentError)
Backtrace:
main.__eval_script__ at (eval):1
Integer(Fixnum)#upto at kernel/core/integer.rb:24
main.__eval_script__ at (eval):1
CompiledMethod#activate at kernel/core/compiled_method.rb:110
main.__script__ at lib/bin/sirb.rb:133
main.load at kernel/core/compile.rb:78
main.require at kernel/core/compile.rb:129
Array#each at kernel/core/array.rb:549
Integer(Fixnum)#times at kernel/core/integer.rb:15
Array#each at kernel/core/array.rb:549
main.require at kernel/core/compile.rb:112
Array#each at kernel/core/array.rb:549
Integer(Fixnum)#times at kernel/core/integer.rb:15
Array#each at kernel/core/array.rb:549
main.require at kernel/core/compile.rb:111
main.__script__ at kernel/loader.rb:150
sirb(eval):004>
Comments and changes to this ticket
-
Brian Ford October 16th, 2007 @ 01:34 AM
- → State changed from “new” to “open”
Recompiling cpu_primitives.c with DEV=1 and setting a breakpoint at machine_handle_fire gives this.
sirb(eval):001> 1.upto(100) { |i| a = Array.new; p a.object_id } Attempted to access field of non reference. Breakpoint 1, machine_handle_fire (kind=2) at machine.c:460 460 g_access_violation = kind; (gdb) bt #0 machine_handle_fire (kind=2) at machine.c:460 #1 0x00218f80 in _bad_reference (in=14) at state.h:275 #2 0x0022101f in cpu_run (state=0x8000, ic=0x500770, setup=0) at instruction_dt.gen:727 #3 0x0024e76d in machine_run (m=0x500180) at machine.c:507 #4 0x0024e877 in machine_run_file (m=0x500180, path=0x2040 "runtime/loader.rbc") at machine.c:532 #5 0x00001d81 in main (argc=1, argv=0xbffff978) at main.c:115 (gdb) rbt 0x610450 <none>#<block>+41 in (eval):1 0x610400 Integer#upto+26 in kernel/core/integer.rb:24 0x6103b0 <none>#__eval_script__+66 in (eval):1 0x610360 CompiledMethod#activate+71 in kernel/core/compiled_method.rb:110 0x2105e20 Class#__script__+820 in lib/bin/sirb.rb:113 0x2106168 Kernel#load+281 in kernel/core/compile.rb:78 0x2107d44 <none>#<block>+270 in kernel/core/compile.rb:129 0x210914c <none>#<block>+34 in kernel/core/array.rb:549 0x210df98 Integer#times+22 in kernel/core/integer.rb:15 0x2112ae4 Array#each+42 in kernel/core/array.rb:549 0x210e09c <none>#<block>+403 in kernel/core/compile.rb:112 0x2112bcc <none>#<block>+34 in kernel/core/array.rb:549 0x212e0d0 Integer#times+22 in kernel/core/integer.rb:15 0x2140a94 Array#each+42 in kernel/core/array.rb:549 0x210e04c Kernel#require+420 in kernel/core/compile.rb:111 0x2112b4c Class#__script__+1334 in kernel/loader.rb:150 $1 = void (gdb) -
Brian Ford October 18th, 2007 @ 01:05 PM
This appears related to blocks because you can do any of the following without causing it:
sirb(eval):008> i = 0; while i < 100; p Array.new.object_id; i += 1; end (repeatedly)sirb(eval):009> p Array.new.object_id 272601 => nil sirb(eval):010> p Array.new.object_id 272777 => nil sirb(eval):011> p Array.new.object_id 272953 => nil sirb(eval):012> p Array.new.object_id 273129 => nil (repeatedly)sirb(eval):013> def out sirb(eval):014* p Array.new.object_id sirb(eval):015* end => #<CompiledMethod:0x42be9 name=out file=(eval)> sirb(eval):016> i = 0; while i < 100; out; i += 1; end (repeatedly) -
-
Charles L November 9th, 2007 @ 01:45 AM
Another thing that only triggers in sirb:
sirb(eval):000> (1...100).inject { |a, b| a * 4 } => 100433627766186892221372630771322662657637687111424552206336 sirb(eval):001> (1...100).inject { |a, b| a * 4 } Attempted to access field of non reference.Where as:
% cat test4.rb (1...100).inject { |a, b| a * 4 } (1...100).inject { |a, b| a * 4 } % ./shotgun/rubinius test4.rb % -
zimbatm January 16th, 2008 @ 05:18 AM
I wasn't able to reproduce the problem on 18470055d83a4...
Wasn't it related to the return value of the block that wouldn't be accessible ?
-
Brian Ford January 20th, 2008 @ 12:52 PM
- → State changed from “open” to “resolved”
I don't seem to be able to reproduce it either. Closing this.
-
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Evan Phoenix