segmentation fault
in [Fortran]
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From: rudra on 24 Sep 2008 05:01 as suggested by david, i have run the valgrind; but this is the first time i ran it...so will anyone plz help me interpreting the output? here is the copy of valgrind: $ valgrind --leak-check=full ./irun <asr.in ==25145== Memcheck, a memory error detector. ==25145== Copyright (C) 2002-2007, and GNU GPL'd, by Julian Seward et al. ==25145== Using LibVEX rev 1732, a library for dynamic binary translation. ==25145== Copyright (C) 2004-2007, and GNU GPL'd, by OpenWorks LLP. ==25145== Using valgrind-3.2.3, a dynamic binary instrumentation framework. ==25145== Copyright (C) 2000-2007, and GNU GPL'd, by Julian Seward et al. ==25145== For more details, rerun with: -v ==25145== ==25145== Conditional jump or move depends on uninitialised value(s) ==25145== at 0x807BADE: for__nml_lex (in /matsc/students/Rudra/ Recursion/ASR/irun) ==25145== by 0x80786F9: for_read_seq_nml (in /matsc/students/Rudra/ Recursion/ASR/irun) ==25145== by 0x804D8E3: MAIN__ (main.f90:70) ==25145== by 0x8049D40: main (in /matsc/students/Rudra/Recursion/ ASR/irun) ==25145== ==25145== Invalid read of size 4 ==25145== at 0x806F6D9: for__add_to_lf_table (in /matsc/students/ Rudra/Recursion/ASR/irun) ==25145== by 0x809CBCE: for__open_proc. (in /matsc/students/Rudra/ Recursion/ASR/irun) ==25145== by 0x8073032: for__open_default (in /matsc/students/Rudra/ Recursion/ASR/irun) ==25145== by 0x808BE0D: for_write_seq_lis (in /matsc/students/Rudra/ Recursion/ASR/irun) ==25145== by 0x804D937: MAIN__ (main.f90:72) ==25145== by 0x8049D40: main (in /matsc/students/Rudra/Recursion/ ASR/irun) ==25145== Address 0x4040BDC is 12 bytes inside a block of size 13 alloc'd ==25145== at 0x4005525: malloc (vg_replace_malloc.c:149) ==25145== by 0x8081B14: for__get_vm (in /matsc/students/Rudra/ Recursion/ASR/irun) ==25145== by 0x809B8EB: for__open_proc. (in /matsc/students/Rudra/ Recursion/ASR/irun) ==25145== by 0x8073032: for__open_default (in /matsc/students/Rudra/ Recursion/ASR/irun) ==25145== by 0x808BE0D: for_write_seq_lis (in /matsc/students/Rudra/ Recursion/ASR/irun) ==25145== by 0x804D937: MAIN__ (main.f90:72) ==25145== by 0x8049D40: main (in /matsc/students/Rudra/Recursion/ ASR/irun) Concentration of Atom A = 0.600000000000000 Concentration of Atom B = 0.400000000000000 ==25145== ==25145== Invalid read of size 4 ==25145== at 0x806F6D9: for__add_to_lf_table (in /matsc/students/ Rudra/Recursion/ASR/irun) ==25145== by 0x809CBCE: for__open_proc. (in /matsc/students/Rudra/ Recursion/ASR/irun) ==25145== by 0x80709DF: for_open (in /matsc/students/Rudra/ Recursion/ASR/irun) ==25145== by 0x804DA9D: MAIN__ (main.f90:81) ==25145== by 0x8049D40: main (in /matsc/students/Rudra/Recursion/ ASR/irun) ==25145== Address 0x40413C4 is 44 bytes inside a block of size 46 alloc'd ==25145== at 0x4005525: malloc (vg_replace_malloc.c:149) ==25145== by 0x8081B14: for__get_vm (in /matsc/students/Rudra/ Recursion/ASR/irun) ==25145== by 0x809B8EB: for__open_proc. (in /matsc/students/Rudra/ Recursion/ASR/irun) ==25145== by 0x80709DF: for_open (in /matsc/students/Rudra/ Recursion/ASR/irun) ==25145== by 0x804DA9D: MAIN__ (main.f90:81) ==25145== by 0x8049D40: main (in /matsc/students/Rudra/Recursion/ ASR/irun) Reading AS-Map complete ==25145== ==25145== Invalid read of size 4 ==25145== at 0x806F6D9: for__add_to_lf_table (in /matsc/students/ Rudra/Recursion/ASR/irun) ==25145== by 0x809CBCE: for__open_proc. (in /matsc/students/Rudra/ Recursion/ASR/irun) ==25145== by 0x80709DF: for_open (in /matsc/students/Rudra/ Recursion/ASR/irun) ==25145== by 0x804DE3D: MAIN__ (main.f90:93) ==25145== by 0x8049D40: main (in /matsc/students/Rudra/Recursion/ ASR/irun) ==25145== Address 0x4236F44 is 44 bytes inside a block of size 46 alloc'd ==25145== at 0x4005525: malloc (vg_replace_malloc.c:149) ==25145== by 0x8081B14: for__get_vm (in /matsc/students/Rudra/ Recursion/ASR/irun) ==25145== by 0x809B8EB: for__open_proc. (in /matsc/students/Rudra/ Recursion/ASR/irun) ==25145== by 0x80709DF: for_open (in /matsc/students/Rudra/ Recursion/ASR/irun) ==25145== by 0x804DE3D: MAIN__ (main.f90:93) ==25145== by 0x8049D40: main (in /matsc/students/Rudra/Recursion/ ASR/irun) Reading STRUCTURE MATRIX complete ==25145== ==25145== Invalid read of size 4 ==25145== at 0x806F6D9: for__add_to_lf_table (in /matsc/students/ Rudra/Recursion/ASR/irun) ==25145== by 0x809CBCE: for__open_proc. (in /matsc/students/Rudra/ Recursion/ASR/irun) ==25145== by 0x80709DF: for_open (in /matsc/students/Rudra/ Recursion/ASR/irun) ==25145== by 0x804E34B: MAIN__ (main.f90:119) ==25145== by 0x8049D40: main (in /matsc/students/Rudra/Recursion/ ASR/irun) ==25145== Address 0x403FB2C is 44 bytes inside a block of size 47 alloc'd ==25145== at 0x4005525: malloc (vg_replace_malloc.c:149) ==25145== by 0x8081B14: for__get_vm (in /matsc/students/Rudra/ Recursion/ASR/irun) ==25145== by 0x809B8EB: for__open_proc. (in /matsc/students/Rudra/ Recursion/ASR/irun) ==25145== by 0x80709DF: for_open (in /matsc/students/Rudra/ Recursion/ASR/irun) ==25145== by 0x804E34B: MAIN__ (main.f90:119) ==25145== by 0x8049D40: main (in /matsc/students/Rudra/Recursion/ ASR/irun) Reading POTENTIAL PARAMETERS from POTPAR_A Reading POTENTIAL PARAMETERS from POTPAR_B ==25145== Warning: client switching stacks? SP change: 0xBEFF4640 --> 0xBD68E350 ==25145== to suppress, use: --max-stackframe=26632944 or greater ==25145== Warning: client switching stacks? SP change: 0xBD68E350 --> 0xBBD28060 ==25145== to suppress, use: --max-stackframe=26632944 or greater ==25145== Warning: client switching stacks? SP change: 0xBBD28060 --> 0xBA3C1D70 ==25145== to suppress, use: --max-stackframe=26632944 or greater ==25145== further instances of this message will not be shown. ==25145== ==25145== Invalid write of size 8 ==25145== at 0x805AC2B: mhop_mp_hop_ (hop.f90:54) ==25145== Address 0xB8A5BA80 is on thread 1's stack ==25145== Can't extend stack to 0xB8A5B470 during signal delivery for thread 1: ==25145== no stack segment ==25145== ==25145== Process terminating with default action of signal 11 (SIGSEGV) ==25145== Access not within mapped region at address 0xB8A5B470 ==25145== at 0x805AC2B: mhop_mp_hop_ (hop.f90:54) ==25145== ==25145== Process terminating with default action of signal 11 (SIGSEGV) ==25145== Access not within mapped region at address 0xB8A5BA7C ==25145== at 0x4001214: _vgnU_freeres (vg_preloaded.c:56) ==25145== ==25145== ERROR SUMMARY: 11 errors from 6 contexts (suppressed: 16 from 1) ==25145== malloc/free: in use at exit: 38,174 bytes in 12 blocks. ==25145== malloc/free: 73,313 allocs, 73,301 frees, 150,415,620 bytes allocated. ==25145== For counts of detected errors, rerun with: -v ==25145== searching for pointers to 12 not-freed blocks. ==25145== checked 5,282,228 bytes. ==25145== ==25145== LEAK SUMMARY: ==25145== definitely lost: 0 bytes in 0 blocks. ==25145== possibly lost: 0 bytes in 0 blocks. ==25145== still reachable: 38,174 bytes in 12 blocks. ==25145== suppressed: 0 bytes in 0 blocks. ==25145== Reachable blocks (those to which a pointer was found) are not shown. ==25145== To see them, rerun with: --leak-check=full --show- reachable=yes Segmentation fault
From: dpb on 24 Sep 2008 12:36 rudra wrote: > as suggested by david, i have run the valgrind; but this is the first > time i ran it...so will anyone plz help me interpreting the output? .... Well, you're one cycle ahead of me, but let's see... > $ valgrind --leak-check=full ./irun <asr.in .... > ==25145== Conditional jump or move depends on uninitialised value(s) > ==25145== at 0x807BADE: for__nml_lex (in /matsc/students/Rudra/ > Recursion/ASR/irun) > ==25145== by 0x80786F9: for_read_seq_nml (in /matsc/students/Rudra/ > Recursion/ASR/irun) > ==25145== by 0x804D8E3: MAIN__ (main.f90:70) > ==25145== by 0x8049D40: main (in /matsc/students/Rudra/Recursion/ > ASR/irun) That seems to indicate that you used an uninitialized variable at line 70 in the main program as starters... > ==25145== > ==25145== Invalid read of size 4 > ==25145== at 0x806F6D9: for__add_to_lf_table (in /matsc/students/ > Rudra/Recursion/ASR/irun) > ==25145== by 0x809CBCE: for__open_proc. (in /matsc/students/Rudra/ > Recursion/ASR/irun) > ==25145== by 0x8073032: for__open_default (in /matsc/students/Rudra/ > Recursion/ASR/irun) > ==25145== by 0x808BE0D: for_write_seq_lis (in /matsc/students/Rudra/ > Recursion/ASR/irun) > ==25145== by 0x804D937: MAIN__ (main.f90:72) > ==25145== by 0x8049D40: main (in /matsc/students/Rudra/Recursion/ > ASR/irun) > ==25145== Address 0x4040BDC is 12 bytes inside a block of size 13 > alloc'd And this seems to indicate you then tried to reference a default REAL or INTEGER at an offset of 12 bytes inside a UDT two lines later. That would be the fourth member it would seem. I'd go look in those two areas first and see what I could see and then go from there... --
From: dpb on 24 Sep 2008 14:32
dpb wrote: .... > That seems to indicate that you used an uninitialized variable at line > 70 in the main program as starters... .... Oh, another thought that instigated...have you compiled w/ all available warnings on and eliminated all of them that could be of significance? I don't know proper switch syntax, but would be at least a chance the uninitialized variable (assuming that is a correct diagnosis) would have thrown a warning during compilation. Compiler can't catch all possible cases, of course, but any it does should certainly be corrected before going on. -- |