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Incomprehensible crash report, Memory access in the middle of valid range!
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Incomprehensible crash report, Memory access in the middle of valid range!


  • Subject: Incomprehensible crash report, Memory access in the middle of valid range!
  • From: Jeremy Sagan <email@hidden>
  • Date: Sun, 16 Sep 2012 17:01:56 -0400

I received a crash report from a user. The crash is in a Coreaudio callback.

I don't understand this crash report as the invalid address is directly in the middle of the shared memory range.

Isn't 0x000000000391f000 in the middle of 0000000003917000-0000000003920000?

Does this indicate bad memory or is there something I am not understanding here?

Date/Time:       2012-09-16 08:19:51.899 -0500
OS Version:      Mac OS X 10.7.4 (11E53)
Report Version:  9

Interval Since Last Report:          2174245 sec
Crashes Since Last Report:           56
Per-App Interval Since Last Report:  170275 sec
Per-App Crashes Since Last Report:   50
Anonymous UUID: 46BA7954-E28C-4893- B31D-6B8D86DAF626

Crashed Thread:  23  com.apple.audio.IOThread.client

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x000000000391f000

VM Regions Near 0x391f000:
VM_ALLOCATE 0000000003915000-0000000003917000 [ 8K] rw-/rwx SM=PRV --> shared memory 0000000003917000-0000000003920000 [ 36K] rw-/rw- SM=SHM CG shared images 0000000003924000-000000000392c000 [ 32K] rw-/rw- SM=SHM

Application Specific Information:
objc[847]: garbage collection is OFF
<snip>
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