Could really use some advise on how get a breakpoint on a segmentation fault
Could really use some advise on how get a breakpoint on a segmentation fault
- Subject: Could really use some advise on how get a breakpoint on a segmentation fault
- From: David Hoerl <email@hidden>
- Date: Fri, 23 Mar 2012 15:59:26 -0400
I have an app that makes much use of mmap. It runs fine in the simulator
and on an iPhone 4. However, it crashes deep in iOS on an iPad 1 and
iPhone 3GS. The app just crashes - I see the desktop - but it never ever
stops in lldb.
I went so far as to incorporate some code to count the amount of free
memory to see if I was getting close to using it all up, but I'm not
(well I was, but not now).
Xcode 4.3.1, connected to a iPhone 3GS, lldb, (debug or release, no
difference), breakpoints on, breakpoint on all exceptions.
The thing runs along processing some images, then boom, this is what I
see in the "Device Log" (but not in the Xcode console):
Mar 23 15:49:48 unknown com.apple.launchd[1] <Notice>:
(UIKitApplication:com.apple.mobilephone[0x5d5e]) Exited: Killed: 9
Mar 23 15:49:48 unknown SpringBoard[27] <Warning>: Application 'Phone'
exited abnormally with signal 9: Killed: 9
>
Mar 23 15:49:51 unknown MobilePhone[368] <Warning>: UI Mode is Phone
Mar 23 15:49:52 unknown com.apple.launchd[1] <Notice>:
(UIKitApplication:com.apple.mobilephone[0xb1f4]) Exited: Killed: 9
>
Mar 23 15:49:53 unknown SpringBoard[27] <Warning>: Application 'Phone'
exited abnormally with signal 9: Killed: 9
Mar 23 15:49:53 unknown com.apple.debugserver-50[363] <Warning>: 1
[016b/1503]: error: ::read ( 4, 0x2ff389f0, 1024 ) => -1 err = Bad file
descriptor (0x00000009)
Mar 23 15:49:53 unknown com.apple.launchd[1] <Notice>:
(UIKitApplication:company.dfh.PhotoScrollerNetworkTurbo[0x2d6a]) Bug:
launchd_core_logic.c:3794 (24506):3
Mar 23 15:49:53 unknown com.apple.launchd[1] <Notice>:
(UIKitApplication:company.dfh.PhotoScrollerNetworkTurbo[0x2d6a]) Bug:
launchd_core_logic.c:3202 (24506):10
Mar 23 15:49:53 unknown com.apple.launchd[1] <Notice>:
(UIKitApplication:company.dfh.PhotoScrollerNetworkTurbo[0x2d6a]) Working
around 5020256. Assuming the job crashed.
Mar 23 15:49:53 unknown com.apple.launchd[1] <Warning>:
(UIKitApplication:company.dfh.PhotoScrollerNetworkTurbo[0x2d6a]) Job
appears to have crashed: Segmentation fault: 11
Mar 23 15:49:53 unknown SpringBoard[27] <Warning>: Application
'PhotoScrollerNetworkTurbo' exited abnormally with signal 11:
Segmentation fault: 11
Mar 23 15:49:54 unknown MobilePhone[370] <Warning>: UI Mode is Phone
I aways see the "com.apple.mobilephone" as the crash unfolds.
Then "read ( 4, 0x2ff389f0, 1024 ) => -1 err = Bad file descriptor
(0x00000009)"
Then "Segmentation fault: 11"
I created rdar://11073206 on this problem along with a project that
makes it happen on the 3GS.
If anyone has any suggestions for what I can do to get a breakpoint to
trigger, that would be most welcome.
David
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