[Vm-dev] Re: NULL pointer deref in fetching events?
John McIntosh
johnmci at smalltalkconsulting.com
Fri May 20 18:50:22 UTC 2016
Ok, well not sure what is going on
ioProcessEvents->
sqInt ioProcessEvents(void) {
aioPoll(0);
if(ioProcessEventsHandler)
ioProcessEventsHandler(); //84
return 0;
}
where ioProcessEventsHandler is this
void nativeIoProcessEvents(void) {
//API Documented
if ([[NSThread currentThread] isCancelled]) {
gQuitNowRightNow = YES;
ioExit(); //This might not return, might call exittoshell
}
if ([getMainWindowDelegate() forceUpdateFlush]) {
[getMainWindowDelegate() ioForceDisplayUpdate];
}
if (interpreterProxy->methodPrimitiveIndex() == 0) {
[gDelegateApp.squeakApplication pumpRunLoopEventSendAndSignal:YES];
} else {
[gDelegateApp.squeakApplication pumpRunLoop];
}
if (gQuitNowRightNow) {
ioExit(); //This might not return, might call exittoshell
}
}
But then we end up over in
/* The stackPointer is below the stackLimit. This is either because of a
stack overflow or the setting of stackLimit to indicate a possible
interrupt. Check for interrupts and stackOverflow and deal with each
appropriately. Answer if a context switch occurred. */
/* StackInterpreter>>#handleStackOverflowOrEventAllowContextSwitch: */
&
/* If contextSwitchIfNotNil is nil we can't context switch.
contextSwitchIfNotNil is set to nil by
- the special primitiveClosureValueNoContextSwitch entry-point in block
dispatch - the stack check in methods with primitive 198.
In a normal method contextSwitchIfNotNil will be the method (see e.g.
SimpleStackBasedCogit>>compileFrameBuild). In a block it will be the
closure (see e.g. SimpleStackBasedCogit>>compileMethodBody). */
/* CoInterpreter>>#ceStackOverflow: */
On Thu, May 19, 2016 at 4:39 PM, Eliot Miranda <eliot.miranda at gmail.com>
wrote:
> Process: Squeak [2023]
> Path: /Users/USER/*/CocoaFast.app/Contents/MacOS/Squeak
> Identifier: org.squeak.Squeak$(VM_MONIKER)
> Version: 5.0.3721 (5.0.3721)
> Code Type: X86 (Native)
> Parent Process: launchd [186]
> Responsible: Squeak [2023]
> User ID: 594
>
> Date/Time: 2016-05-19 16:37:13.900 -0700
> OS Version: Mac OS X 10.9.5 (13F1808)
> Report Version: 11
> Anonymous UUID: F54BABC9-4764-81AE-0375-EA1A9A4A38C2
>
>
> Crashed Thread: 0 Dispatch queue: com.apple.main-thread
>
> Exception Type: EXC_BAD_ACCESS (SIGBUS)
> Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000000
>
> VM Regions Near 0:
> --> __PAGEZERO 0000000000000000-0000000000001000 [ 4K]
> ---/--- SM=NUL /Users/USER/*/CocoaFast.app/Contents/MacOS/Squeak
> VM_ALLOCATE 0000000000001000-00000000000cf000 [ 824K]
> ---/--- SM=NUL
>
> Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
> 0 com.apple.CoreFoundation 0x9821a95d CFRunLoopRunSpecific + 253
> 1 com.apple.CoreFoundation 0x9821a84b CFRunLoopRunInMode + 123
> 2 com.apple.Foundation 0x91c48559 -[NSRunLoop(NSRunLoop)
> runMode:beforeDate:] + 277
> 3 org.squeak.Squeak$(VM_MONIKER) 0x00145f70
> -[sqSqueakMainApplication(events) pumpRunLoop] + 99
> (sqSqueakMainApplication+events.m:69)
> 4 org.squeak.Squeak$(VM_MONIKER) 0x0013beb8
> -[sqSqueakOSXApplication(events) pumpRunLoop] + 50
> (sqSqueakOSXApplication+events.m:127)
> 5 org.squeak.Squeak$(VM_MONIKER) 0x00143c56 nativeIoProcessEvents + 208
> (sqSqueakEventsAPI.m:70)
> 6 org.squeak.Squeak$(VM_MONIKER) 0x00143caa ioProcessEvents + 35
> (sqSqueakEventsAPI.m:84)
> 7 org.squeak.Squeak$(VM_MONIKER) 0x000dc82a
> checkForEventsMayContextSwitch + 884 (gcc3x-cointerp.c:61595)
> 8 org.squeak.Squeak$(VM_MONIKER) 0x000dbaec
> handleStackOverflowOrEventAllowContextSwitch + 33 (gcc3x-cointerp.c:64780)
> 9 org.squeak.Squeak$(VM_MONIKER) 0x000dfb2e ceStackOverflow + 108
> (gcc3x-cointerp.c:11701)
> 10 ??? 0x055262c6 0 + 89285318
>
> _,,,^..^,,,_
> best, Eliot
>
--
===========================================================================
John M. McIntosh. Corporate Smalltalk Consulting Ltd
https://www.linkedin.com/in/smalltalk
===========================================================================
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