On 15/01/2012 00:07, Gabor Greif wrote:
Hello hackers,
my "hello world" program compiles and links, but when running on the
embedded PowerPC board it crashes like this:
(gdb) run
Starting program: /root/test
test: internal error: stg_ap_p_ret
(GHC version 7.5.20120111 for powerpc_unknown_linux)
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
Program received signal SIGABRT, Aborted.
0x0fdc0a4c in raise () from /lib/tls/libc.so.6
(gdb) bt
#0 0x0fdc0a4c in raise () from /lib/tls/libc.so.6
#1 0x0fdc2488 in abort () from /lib/tls/libc.so.6
#2 0x1029b300 in rtsFatalInternalErrorFn ()
#3 0x1029b024 in barf ()
#4 0x102b3f9c in stg_ap_p_info ()
#5 0x1029d0ac in scheduleWaitThread ()
#6 0x102c69a8 in rts_evalLazyIO ()
#7 0x1029ae80 in real_main ()
#8 0x1029afc8 in hs_main ()
#9 0x10002168 in main ()
(gdb) c
Continuing.
Program terminated with signal SIGABRT, Aborted.
The program no longer exists.
This back trace tells us almost nothing, I'm afraid - many different
kinds of corruption end up as crashes in stg_ap_p_info or some other bit
of the RTS.
I suggest following the instructions in
http://hackage.haskell.org/trac/ghc/wiki/Debugging/CompiledCode
and see how far you get. Come back if you get stuck.
Cheers,
Simon
'git grep' does not turn up any hits for 'stg_ap_p_info', and
'scheduleWaitThread' looks pretty much innocent. Where is the best
place to get into debugging this?
I gather stg_ap_p_info is a (global data) StgInfoTable, but then again
it appears in the backtrace, (tables beside code?). Why would it barf
at all?
I am thinking that some host configury may still be leaking into the
target, so I might be fighting a deceived RTS ('revenge tastes best
when served cold'). But the host and target should be pretty
comparable linux OSs.
I am thankful for any hints.
Cheers,
Gabor
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