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PBCatalogSearchAsync and pthreads

Subject: PBCatalogSearchAsync and pthreads
From: "Umed Zokirov" <email@hidden>
Date: Thu, 29 Sep 2005 20:08:51 +0000
Delivered-to: email@hidden
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Hi there,

We have an installer that searches for a copy of our application on user's machines using PBCatalogSearchAsync. Basically for every mounted volume we spun off a pthread that calls PBCatalogSearchAsync and in PBCatalogSearchAsync's completion routine we add the search results to an array(using a mutex).

Unfortunately our application crashes with the follwoing snippet from a crash reporter:

Exception:  EXC_BAD_ACCESS (0x0001)
Codes:      KERN_PROTECTION_FAILURE (0x0002) at 0x00000058

Thread 0: 0 libSystem.B.dylib 0x9000a738 mach_msg_trap + 8 1 libSystem.B.dylib 0x9000a67c mach_msg + 60 2 com.apple.CoreFoundation 0x9f8d8338 __CFRunLoopRun + 832 3 com.apple.CoreFoundation 0x9f8d7c3c CFRunLoopRunSpecific + 268 4 com.apple.HIToolbox 0x91fd8ac0 RunCurrentEventLoopInMode + 264 5 com.apple.HIToolbox 0x91fd8154 ReceiveNextEventCommon + 380 6 com.apple.HIToolbox 0x91fd7fc0 BlockUntilNextEventMatchingListInMode + 96 7 com.apple.AppKit 0x924c0e44 _DPSNextEvent + 384 8 com.apple.AppKit 0x924c0b08 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 116 9 com.apple.AppKit 0x924bd06c -[NSApplication run] + 472 10 com.apple.AppKit 0x925ad8bc NSApplicationMain + 452 11 com.intuit.turbotaxupdater 0x00002a2c main + 64 (main.m:13) 12 com.intuit.turbotaxupdater 0x00002248 _start + 344 (crt.c:272) 13 com.intuit.turbotaxupdater 0x000020ec start + 60

Thread 1 Crashed: 0 <<00000000>> 0xffff87f0 __memcpy + 80 (cpu_capabilities.h:189) 1 ...ple.CoreServices.CarbonCore 0x90b29fbc ConvertFSCatalogInfoToSearchInfo(VolumeInfo const*, unsigned long, FSCatalogInfo const*, CatalogAttributeInfo*) + 96 2 ...ple.CoreServices.CarbonCore 0x90b29dac PBCatalogSearchSync + 244 3 ...ple.CoreServices.CarbonCore 0x90b6c5f8 AsyncFileThread(void*) + 180 4 libSystem.B.dylib 0x9002c3b4 _pthread_body + 96

Thread 2: 0 libSystem.B.dylib 0x90032008 pthread_cond_signal + 8 1 ...ple.CoreServices.CarbonCore 0x90b6c844 TSSignalSemaphore + 116 2 ...ple.CoreServices.CarbonCore 0x90b6c4cc DoAsyncFileRequest + 220 3 com.intuit.turbotaxupdater 0x000034b4 ThrFileSearch::search(void*) + 68 (ThrFileSearch.cpp:120) 4 libSystem.B.dylib 0x9002c3b4 _pthread_body + 96

Thread 1 crashed with PPC Thread State 64: srr0: 0x00000000ffff87f0 srr1: 0x100000000000d030 vrsave: 0x0000000000000000 cr: 0x84000410 xer: 0x0000000000000000 lr: 0x0000000090b29fbc ctr: 0x00000000901241c0 r0: 0x0000000090b29fbc r1: 0x00000000f0202620 r2: 0x0000000000000000 r3: 0x0000000000000058 r4: 0x0000000000000058 r5: 0x0000000000000010 r6: 0x00000000f0202c20 r7: 0x0000000000000000 r8: 0x0000000000000001 r9: 0x00000000f0202dac r10: 0x00000000003620f8 r11: 0x00000000a0afe7a8 r12: 0x00000000f0202c78 r13: 0x0000000000000000 r14: 0x0000000000000000 r15: 0x0000000000000000 r16: 0x0000000000000000 r17: 0x0000000000000000 r18: 0x0000000000000000 r19: 0x0000000000000000 r20: 0x0000000000000000 r21: 0x000000000030f8b0 r22: 0x0000000000362090 r23: 0x00000000f0202cf0 r24: 0x00000000f0202c30 r25: 0x0000000000362010 r26: 0x0000000000000038 r27: 0x000000000030f8b0 r28: 0x0000000000001200 r29: 0x0000000000000000 r30: 0x00000000f0202c30 r31: 0x0000000090b6c54c

The thing is that the thread that crashes is not the one we spin off.

AsyncFileThread(void*)  is (I assume) Apple's private API.

PBCatalogSearchAsync is thread safe as of 10.0 so I don' t know what we are doing to cause

the crash(I suppose calling some non-reentrant code)


         Umed

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