Building on android - compiled program segfaults

[Nathan Hüsken]

I just find out how to get in usefull backtrace with android ndk
(unfortantly I am also new to the ndk).

Now I get:
Program received signal SIGSEGV, Segmentation fault.
0x003f05a8 in stg_returnToStackTop ()
(gdb) bt
#0  0x003f05a8 in stg_returnToStackTop ()
#1  0x003c2e74 in schedule (initialCapability=0x3f059c, task=0x530350)
    at rts/Schedule.c:463
#2  0x003c2e74 in schedule (initialCapability=0x530340, task=0x400a42f0)
    at rts/Schedule.c:463
#3  0x003c4c50 in scheduleWaitThread (tso=0x401033c0, ret=0x0,
pcap=0xbe89ab6c)
    at rts/Schedule.c:2345
#4  0x00408544 in rts_evalLazyIO (cap=0xbe89ab6c, p=0x50a020, ret=0x0)
    at rts/RtsAPI.c:499
#5  0x003c08c8 in real_main () at rts/RtsMain.c:68
#6  0x003c0a54 in hs_main (argc=1, argv=0xbe89abf4, main_closure=0x50a020,
    rts_config=...) at rts/RtsMain.c:123
#7  0x0000a23c in main ()

stg_returnToStackTop is defined in rts/StgStartup.cmm (a c-- file).

I would guess that

jump %ENTRY_CODE(Sp(0)) [];

could be the problem. Since p8 $r13 gives me

0xbef00a74:    0x0
(...)

Sp(0) would be 0x0, correct?

On 01/11/2013 02:16 PM, Simon Marlow wrote:
> On 11/01/13 11:36, Nathan Hüsken wrote:
>> Hi,
>>
>> I was succesfull in building ghc (pulled from git) to compile for
>> arm-linux-androideabi!
>>
>> Now using "inplace/bin/ghc-stage1 -dcore-lint -debug" I compiler this
>> Main.hs:
>>
>> main = putStrLn "Hello, World"
>>
>> I get an executable, which I can run on my android device. Unfortantly
>> it segfaults.
>>
>> Running it with ./Main +RTS -DS gives:
>>
>> cap 0: initialised
>>
>> Now I am trying to debug this in gdb. When I try to display the stack
>> (which should be in r13 on arm of I understand correctly, I get);
> 
> First establish whether the crash is in C or Haskell: what does 'bt'
> tell you in gdb?
> 
> Cheers,
>     Simon
> 
> 
>> (gdb) p8 $r13
>> 0xbef00a74:    0x0
>> 0xbef00a70:    0x0
>> 0xbef00a6c:    0x3c2e74
>> 0xbef00a68:    0x530350
>> 0xbef00a64:    0x0
>> 0xbef00a60:    0x0
>> 0xbef00a5c:    0x0
>> 0xbef00a58:    0x0
>>
>> And now I am clueless. So I tried the good old printf debugging in the
>> rts. Using this, I see that it gets before the call to
>> scheduleWaitThread in the function rts_evalLazyIO (in RtsAPI.c).
>>
>> But when I put a printf in the beginning of scheduleWaitThread (in
>> Schedule.c) it is not shown.
>>
>> What else can I do to find out more?
>> Thanks!
>> Nathan
>>
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>>
>