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| ID | Category | Severity | Reproducibility | Date Submitted | Last Update | ||||||||
| 0003929 | [Squeak Packages] FFI | major | always | 06-28-06 19:41 | 04-08-10 14:32 | ||||||||
| Reporter | nicolas cellier | View Status | public | ||||||||||
| Assigned To | andreas | ||||||||||||
| Priority | normal | Resolution | fixed | ||||||||||
| Status | resolved | ||||||||||||
| Summary | 0003929: [BUG][FFI] strange behavior on unix vm/plugin: seventh call lead to unconsistent results | ||||||||||||
| Description |
The test case provided in attached files will return false from the seventh call on, when it should always return true. try DLANGE2Library testDLANGE2. Behaviour is very strange. It's like the image is getting corrupted. When executing step by step in Debugger, of course the bug does not show up... |
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| Additional Information |
place libdlange2.so in local directory, launch squeak, load DLANGE2Library.st, save the image. Then execute DLANGE2Library testDLANGE2 inspect. You should get an array with 10 true. But starting at 7, all elements are false. This bug did not show on a windows XP platform. |
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| Attached Files |
 DLANGE2Library.st [^] (1,549 bytes) 06-28-06 19:42 libdlange2.so [^] (1,719 bytes) 06-28-06 19:42 dlange2.c [^] (324 bytes) 06-28-06 19:43 |
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(0005412 - 411 - 473 - 473 - 473 - 473 - 473) nicolas cellier 06-28-06 19:47 |
You can compile the library with: gcc -c dlange2.c; ld -shared -o libdlange2.so dlange2.o SUBROUTINE DLANGE is a FORTRAN routine from LAPACK library to compute a matrix norm. I use it for SUnit TestCase checks on my Smallapack port to Squeak (Smalltalk interface to LAPACK). It as been translated by f2c, then changed to simply return 0.0. By now, Smallapack port to Squeak is blocked by this bug. |
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(0005418 - 663 - 693 - 693 - 693 - 693 - 693) andreas 06-28-06 21:40 |
You need to do some of your own debugging first. Start out with: - Telling us what OS, hardware (CPU), architecture you are running on - Check whether later versions of the VM also have this problem or if it's specific to your version - Check what the *actual* result of the call is (e.g., whether it compares equal to 0.0 is a completely useless bit of information here) - Change the return value from 0.0 to something else (say 42.0) since the bit pattern for 0.0 is equal to zero is equal to NULL etc. Put differently there is no guarantee that your call *ever* returns the correct result - Asking Ian whether there are any known problems with FFI support |
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(0005422 - 889 - 1066 - 1066 - 1139 - 1139 - 1139) nicolas cellier 06-28-06 22:29 |
Thanks Andreas MY SYSTEM (A MANDRAKE 9 LINUX) - uname -a is: Linux wifi2 2.4.29 0000004 mer f� 23 01:09:47 CET 2005 i686 unknown unknown GNU/Linux MY SQUEAK VM (IT IS THE REGULAR STABLE RELEASE FROM squeak.org) - squeak -version is: 3.7-7 #1 Sat Mar 19 13:12:20 PST 2005 gcc 3.3.5 Squeak3.7 of '4 September 2004' [latest update: #5989] Linux squeak.hpl.hp.com 2.4.27-1-386 #1 Fri Sep 3 06:24:46 UTC 2004 i686 GNU/Linux default plugin location: /usr/local/lib/squeak/3.7-7/*.so THE RESULT ANSWERED BY THE FFI CALL - if i write the test as: | val | val = self dlange...etc... val = 0.0 what i obtain is false, but val is perfectly equal to zero (evaluating val=0.0 or val isZero in the debugger will answer true). So yes, the correct value is returned, and that is what i call strange behavior I'am going to inquire newer VM and FFI plugin and ask Ian... |
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(0005658 - 80 - 80 - 80 - 80 - 80 - 80) andreas 07-09-06 06:53 |
Is there any news on this issue? Anything that can be done before 3.9 goes gold? |
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(0012919 - 9491 - 14299 - 14299 - 14299 - 14299 - 14299) nicolas cellier 01-11-09 01:43 |
I tried and debug via gdb, put a break point at ffiCallAddressOf+49 (gdb) disas ffiCallAddressOf 0x08090a08 <ffiCallAddressOf+0>: push %ebp 0x08090a09 <ffiCallAddressOf+1>: mov %esp,%ebp 0x08090a0b <ffiCallAddressOf+3>: mov 0x10(%ebp),%ecx 0x08090a0e <ffiCallAddressOf+6>: test %ecx,%ecx 0x08090a10 <ffiCallAddressOf+8>: je 0x8090a25 <ffiCallAddressOf+29> 0x08090a12 <ffiCallAddressOf+10>: sub %ecx,%esp 0x08090a14 <ffiCallAddressOf+12>: sub $0x4,%ecx 0x08090a17 <ffiCallAddressOf+15>: mov 0xc(%ebp),%edx 0x08090a1a <ffiCallAddressOf+18>: mov (%edx,%ecx,1),%eax 0x08090a1d <ffiCallAddressOf+21>: mov %eax,(%esp,%ecx,1) 0x08090a20 <ffiCallAddressOf+24>: sub $0x4,%ecx 0x08090a23 <ffiCallAddressOf+27>: jae 0x8090a1a <ffiCallAddressOf+18> 0x08090a25 <ffiCallAddressOf+29>: call *0x8(%ebp) 0x08090a28 <ffiCallAddressOf+32>: mov %eax,0x812a760 0x08090a2d <ffiCallAddressOf+37>: mov %edx,0x812a764 0x08090a33 <ffiCallAddressOf+43>: fstl 0x8129f40 0x08090a39 <ffiCallAddressOf+49>: mov %ebp,%esp 0x08090a3b <ffiCallAddressOf+51>: pop %ebp 0x08090a3c <ffiCallAddressOf+52>: ret 0x08090a3d <ffiCallAddressOf+53>: nop 0x08090a3e <ffiCallAddressOf+54>: nop 0x08090a3f <ffiCallAddressOf+55>: nop End of assembler dump. It seems like the floating point register stack overflows... Though ffiFloatReturnValue is always 0.0, I further get a NaN at 7th call to primitiveFloatEqualtoArg, maybe because this one needs two fp registers for comparands and fp stack only has one slot left... Here is the process: (gdb) cont Continuing. Breakpoint 9, ffiCallAddressOf () at /windata/Smalltalk/Squeak/Squeak-3.10-1/platforms/unix/plugins/SqueakFFIPrims/x86-sysv-asm.S:51 51 fstl ffiFloatReturnValue (gdb) Continuing. Breakpoint 9, ffiCallAddressOf () at /windata/Smalltalk/Squeak/Squeak-3.10-1/platforms/unix/plugins/SqueakFFIPrims/x86-sysv-asm.S:51 51 fstl ffiFloatReturnValue (gdb) info float R7: Empty 0x3ff889731d0000000000 R6: Empty 0x00000000000000000000 =>R5: Zero 0x00000000000000000000 +0 R4: Empty 0x00000000000000000000 R3: Empty 0x40008cabcfae00000000 R2: Empty 0x00000000000000000000 R1: Empty 0xc002989e10f340000000 R0: Empty 0x00000000000000000000 Status Word: 0x6861 IE PE SF C3 TOP: 5 Control Word: 0x127f IM DM ZM OM UM PM PC: Double Precision (53-bits) RC: Round to nearest Tag Word: 0xf7ff Instruction Pointer: 0x00:0x00000000 Operand Pointer: 0x00:0x00000000 Opcode: 0x0000 (gdb) x /1lf 0x8129f40 0x8129f40 <ffiFloatReturnValue>: 0 (gdb) cont Continuing. Breakpoint 9, ffiCallAddressOf () at /windata/Smalltalk/Squeak/Squeak-3.10-1/platforms/unix/plugins/SqueakFFIPrims/x86-sysv-asm.S:51 51 fstl ffiFloatReturnValue (gdb) info float R7: Empty 0x3ff889731d0000000000 R6: Empty 0x00000000000000000000 R5: Zero 0x00000000000000000000 +0 =>R4: Zero 0x00000000000000000000 +0 R3: Empty 0x00000000000000000000 R2: Empty 0x00000000000000000000 R1: Empty 0xc002989e10f340000000 R0: Empty 0x00000000000000000000 Status Word: 0x6061 IE PE SF C3 TOP: 4 Control Word: 0x127f IM DM ZM OM UM PM PC: Double Precision (53-bits) RC: Round to nearest Tag Word: 0xf5ff Instruction Pointer: 0x00:0x00000000 Operand Pointer: 0x00:0x00000000 Opcode: 0x0000 (gdb) x /1lf 0x8129f40 0x8129f40 <ffiFloatReturnValue>: 0 (gdb) cont Continuing. Breakpoint 9, ffiCallAddressOf () at /windata/Smalltalk/Squeak/Squeak-3.10-1/platforms/unix/plugins/SqueakFFIPrims/x86-sysv-asm.S:51 51 fstl ffiFloatReturnValue (gdb) info float R7: Empty 0x3ff889731d0000000000 R6: Empty 0x00000000000000000000 R5: Zero 0x00000000000000000000 +0 R4: Zero 0x00000000000000000000 +0 =>R3: Zero 0x00000000000000000000 +0 R2: Empty 0x00000000000000000000 R1: Empty 0xc002989e10f340000000 R0: Empty 0x00000000000000000000 Status Word: 0x5861 IE PE SF C3 TOP: 3 Control Word: 0x127f IM DM ZM OM UM PM PC: Double Precision (53-bits) RC: Round to nearest Tag Word: 0xf57f Instruction Pointer: 0x00:0x00000000 Operand Pointer: 0x00:0x00000000 Opcode: 0x0000 (gdb) x /1lf 0x8129f40 0x8129f40 <ffiFloatReturnValue>: 0 (gdb) cont Continuing. Breakpoint 9, ffiCallAddressOf () at /windata/Smalltalk/Squeak/Squeak-3.10-1/platforms/unix/plugins/SqueakFFIPrims/x86-sysv-asm.S:51 51 fstl ffiFloatReturnValue (gdb) info float R7: Empty 0x3ff889731d0000000000 R6: Empty 0x00000000000000000000 R5: Zero 0x00000000000000000000 +0 R4: Zero 0x00000000000000000000 +0 R3: Zero 0x00000000000000000000 +0 =>R2: Zero 0x00000000000000000000 +0 R1: Empty 0x00000000000000000000 R0: Empty 0x00000000000000000000 Status Word: 0x5061 IE PE SF C3 TOP: 2 Control Word: 0x127f IM DM ZM OM UM PM PC: Double Precision (53-bits) RC: Round to nearest Tag Word: 0xf55f Instruction Pointer: 0x00:0x00000000 Operand Pointer: 0x00:0x00000000 Opcode: 0x0000 (gdb) x /1lf 0x8129f40 0x8129f40 <ffiFloatReturnValue>: 0 (gdb) cont Continuing. Breakpoint 9, ffiCallAddressOf () at /windata/Smalltalk/Squeak/Squeak-3.10-1/platforms/unix/plugins/SqueakFFIPrims/x86-sysv-asm.S:51 51 fstl ffiFloatReturnValue (gdb) info float R7: Empty 0x3ff889731d0000000000 R6: Empty 0x00000000000000000000 R5: Zero 0x00000000000000000000 +0 R4: Zero 0x00000000000000000000 +0 R3: Zero 0x00000000000000000000 +0 R2: Zero 0x00000000000000000000 +0 =>R1: Zero 0x00000000000000000000 +0 R0: Empty 0x00000000000000000000 Status Word: 0x4861 IE PE SF C3 TOP: 1 Control Word: 0x127f IM DM ZM OM UM PM PC: Double Precision (53-bits) RC: Round to nearest Tag Word: 0xf557 Instruction Pointer: 0x00:0x00000000 Operand Pointer: 0x00:0x00000000 Opcode: 0x0000 (gdb) x /1lf 0x8129f40 0x8129f40 <ffiFloatReturnValue>: 0 (gdb) cont Continuing. Breakpoint 9, ffiCallAddressOf () at /windata/Smalltalk/Squeak/Squeak-3.10-1/platforms/unix/plugins/SqueakFFIPrims/x86-sysv-asm.S:51 51 fstl ffiFloatReturnValue (gdb) info float R7: Empty 0x00000000000000000000 R6: Empty 0x00000000000000000000 R5: Zero 0x00000000000000000000 +0 R4: Zero 0x00000000000000000000 +0 R3: Zero 0x00000000000000000000 +0 R2: Zero 0x00000000000000000000 +0 R1: Zero 0x00000000000000000000 +0 =>R0: Zero 0x00000000000000000000 +0 Status Word: 0x4061 IE PE SF C3 TOP: 0 Control Word: 0x127f IM DM ZM OM UM PM PC: Double Precision (53-bits) RC: Round to nearest Tag Word: 0xf555 Instruction Pointer: 0x00:0x00000000 Operand Pointer: 0x00:0x00000000 Opcode: 0x0000 (gdb) x /1lf 0x8129f40 0x8129f40 <ffiFloatReturnValue>: 0 (gdb) cont Continuing. Breakpoint 9, ffiCallAddressOf () at /windata/Smalltalk/Squeak/Squeak-3.10-1/platforms/unix/plugins/SqueakFFIPrims/x86-sysv-asm.S:51 51 fstl ffiFloatReturnValue (gdb) info float =>R7: Zero 0x00000000000000000000 +0 R6: Empty 0x00000000000000000000 R5: Zero 0x00000000000000000000 +0 R4: Zero 0x00000000000000000000 +0 R3: Zero 0x00000000000000000000 +0 R2: Zero 0x00000000000000000000 +0 R1: Zero 0x00000000000000000000 +0 R0: Zero 0x00000000000000000000 +0 Status Word: 0x7861 IE PE SF C3 TOP: 7 Control Word: 0x127f IM DM ZM OM UM PM PC: Double Precision (53-bits) RC: Round to nearest Tag Word: 0x7555 Instruction Pointer: 0x00:0x00000000 Operand Pointer: 0x00:0x00000000 Opcode: 0x0000 (gdb) x /1lf 0x8129f40 0x8129f40 <ffiFloatReturnValue>: 0 (gdb) cont Continuing. Breakpoint 9, ffiCallAddressOf () at /windata/Smalltalk/Squeak/Squeak-3.10-1/platforms/unix/plugins/SqueakFFIPrims/x86-sysv-asm.S:51 51 fstl ffiFloatReturnValue (gdb) Calling convention mismatch ? Or lack of a pop (fstlp 0x8129f40) in ffiCallAddressOf ? I declared to be cdecl: <cdecl: double 'dlange_'( char * long * long * double * long * double * long )> ^self externalCallFailed Was it all right ? Can someone confirm what I say ? I don't want to dig more and become an expert of IA-32 ! |
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(0012920 - 136 - 183 - 183 - 183 - 183 - 183) nicolas cellier 01-11-09 20:36 |
Changing line 51 of x86-sysv-asm.S solved this problem: fstpl ffiFloatReturnValue I do not know other implications. Please check. |
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(0012922 - 245 - 257 - 465 - 465 - 465 - 465) nicolas cellier 01-15-09 07:25 |
Eliot Miranda suggested that a fninit be placed in FFI preamble (of course, before starting to stack arguments), and maybe in other relevant places in the VM. See http://lists.squeakfoundation.org/pipermail/squeak-dev/2009-January/133575.html [^] |
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(0013627 - 23 - 23 - 23 - 23 - 23 - 23) nicolas cellier 04-06-10 20:34 |
Fixed in unix VM 3.11-3 |
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Issue History |
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| Date Modified | Username | Field | Change |
| 06-28-06 19:41 | nicolas cellier | New Issue | |
| 06-28-06 19:41 | nicolas cellier | Status | new => assigned |
| 06-28-06 19:41 | nicolas cellier | Assigned To | => andreas |
| 06-28-06 19:42 | nicolas cellier | File Added: DLANGE2Library.st | |
| 06-28-06 19:42 | nicolas cellier | File Added: libdlange2.so | |
| 06-28-06 19:43 | nicolas cellier | File Added: dlange2.c | |
| 06-28-06 19:47 | nicolas cellier | Note Added: 0005412 | |
| 06-28-06 21:40 | andreas | Note Added: 0005418 | |
| 06-28-06 22:29 | nicolas cellier | Note Added: 0005422 | |
| 07-09-06 06:53 | andreas | Note Added: 0005658 | |
| 07-09-06 06:53 | andreas | Status | assigned => feedback |
| 01-11-09 01:43 | nicolas cellier | Note Added: 0012919 | |
| 01-11-09 14:52 | lewis | Issue Monitored: lewis | |
| 01-11-09 20:36 | nicolas cellier | Note Added: 0012920 | |
| 01-15-09 07:25 | nicolas cellier | Note Added: 0012922 | |
| 04-06-10 20:34 | nicolas cellier | Status | feedback => resolved |
| 04-06-10 20:34 | nicolas cellier | Resolution | open => fixed |
| 04-06-10 20:34 | nicolas cellier | Note Added: 0013627 | |
| 04-08-10 14:32 | laza | Project | Squeak => Squeak Packages |
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