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From: "aleksey dot shipilev at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/34716] application segfaults when compiled with -O2, but works well with -O1
Date: Tue, 08 Jan 2008 21:23:00 -0000 [thread overview]
Message-ID: <20080108203720.13433.qmail@sourceware.org> (raw)
In-Reply-To: <bug-34716-15595@http.gcc.gnu.org/bugzilla/>
------- Comment #6 from aleksey dot shipilev at gmail dot com 2008-01-08 20:37 -------
Here you go, Andrew.
# gdb ./a.out
GNU gdb 6.7.1
(gdb) set disassembly-flavor intel
(gdb) run
Starting program: ~/src/gcc-b/a.out
before: output=bffa911c, buf=bffa8f1c
after: output=bffa911c, buf=bffa8f1c
sizeof(buf)=512
result=0
OK on reading from device
Program received signal SIGSEGV, Segmentation fault.
0x08048571 in main () at test2.c:39
39 }
(gdb) disassemble
Dump of assembler code for function main:
0x08048480 <main+0>: lea ecx,[esp+0x4]
0x08048484 <main+4>: and esp,0xfffffff0
0x08048487 <main+7>: push DWORD PTR [ecx-0x4]
0x0804848a <main+10>: push ebp
0x0804848b <main+11>: mov ebp,esp
0x0804848d <main+13>: sub esp,0x238
0x08048493 <main+19>: mov DWORD PTR [ebp-0xc],ebx
0x08048496 <main+22>: xor ebx,ebx
0x08048498 <main+24>: mov DWORD PTR [ebp-0x10],ecx
0x0804849b <main+27>: mov DWORD PTR [ebp-0x8],esi
0x0804849e <main+30>: mov DWORD PTR [ebp-0x4],edi
0x080484a1 <main+33>: lea edi,[ebp-0x1c]
0x080484a4 <main+36>: mov BYTE PTR [ebp-0x14],0xb0
0x080484a8 <main+40>: mov BYTE PTR [ebp-0x13],0x1
0x080484ac <main+44>: mov BYTE PTR [ebp-0x12],0xd1
0x080484b0 <main+48>: mov BYTE PTR [ebp-0x11],0x1
0x080484b4 <main+52>: mov DWORD PTR [esp+0x4],ebx
0x080484b8 <main+56>: lea ebx,[ebp-0x21c]
0x080484be <main+62>: mov DWORD PTR [esp],0x804867c
0x080484c5 <main+69>: call 0x804836c <open@plt>
0x080484ca <main+74>: mov DWORD PTR [ebp-0x224],eax
0x080484d0 <main+80>: mov DWORD PTR [esp+0x8],ebx
0x080484d4 <main+84>: mov DWORD PTR [esp+0x4],edi
0x080484d8 <main+88>: mov DWORD PTR [esp],0x8048685
0x080484df <main+95>: call 0x80483ac <printf@plt>
0x080484e4 <main+100>: mov ecx,0x31f
0x080484e9 <main+105>: lea eax,[ebp-0x14]
0x080484ec <main+108>: mov DWORD PTR [esp+0x4],ecx
0x080484f0 <main+112>: mov DWORD PTR [esp+0xc],ebx
0x080484f4 <main+116>: mov DWORD PTR [esp+0x8],eax
0x080484f8 <main+120>: mov eax,DWORD PTR [ebp-0x224]
0x080484fe <main+126>: mov DWORD PTR [esp],eax
0x08048501 <main+129>: call 0x804839c <ioctl@plt>
0x08048506 <main+134>: mov DWORD PTR [esp+0x8],ebx
0x0804850a <main+138>: mov DWORD PTR [esp+0x4],edi
0x0804850e <main+142>: mov DWORD PTR [esp],0x80486a0
0x08048515 <main+149>: mov esi,eax
0x08048517 <main+151>: call 0x80483ac <printf@plt>
0x0804851c <main+156>: mov edx,0x200
0x08048521 <main+161>: mov DWORD PTR [esp+0x4],edx
0x08048525 <main+165>: mov DWORD PTR [esp],0x80486bb
0x0804852c <main+172>: call 0x80483ac <printf@plt>
0x08048531 <main+177>: mov DWORD PTR [esp+0x4],esi
0x08048535 <main+181>: mov DWORD PTR [esp],0x80486cb
0x0804853c <main+188>: call 0x80483ac <printf@plt>
0x08048541 <main+193>: test esi,esi
0x08048543 <main+195>: je 0x8048572 <main+242>
0x08048545 <main+197>: mov eax,0x804867c
0x0804854a <main+202>: mov DWORD PTR [esp+0x4],eax
0x0804854e <main+206>: mov DWORD PTR [esp],0x80486f0
0x08048555 <main+213>: call 0x80483ac <printf@plt>
0x0804855a <main+218>: mov eax,0x1
0x0804855f <main+223>: mov ecx,DWORD PTR [ebp-0x10]
0x08048562 <main+226>: mov ebx,DWORD PTR [ebp-0xc]
0x08048565 <main+229>: mov esi,DWORD PTR [ebp-0x8]
0x08048568 <main+232>: mov edi,DWORD PTR [ebp-0x4]
0x0804856b <main+235>: mov esp,ebp
0x0804856d <main+237>: pop ebp
0x0804856e <main+238>: lea esp,[ecx-0x4]
0x08048571 <main+241>: ret
0x08048572 <main+242>: mov DWORD PTR [esp],0x80486d6
0x08048579 <main+249>: call 0x80483cc <puts@plt>
0x0804857e <main+254>: mov eax,DWORD PTR [ebp-0x21c]
0x08048584 <main+260>: mov DWORD PTR [ebp-0x1c],eax
0x08048587 <main+263>: mov eax,DWORD PTR [ebp-0x218]
0x0804858d <main+269>: mov DWORD PTR [ebp-0x18],eax
0x08048590 <main+272>: mov eax,DWORD PTR [ebp-0x224]
0x08048596 <main+278>: mov DWORD PTR [esp],eax
0x08048599 <main+281>: call 0x80483bc <close@plt>
0x0804859e <main+286>: xor eax,eax
0x080485a0 <main+288>: jmp 0x804855f <main+223>
End of assembler dump.
(gdb) bt
#0 0x08048571 in main () at test2.c:39
(gdb) info registers
eax 0x0 0
ecx 0x33010010 855703568
edx 0xbffa8f1c -1074098404
ebx 0x0 0
esp 0x3301000c 0x3301000c
ebp 0x0 0x0
esi 0x0 0
edi 0x19030000 419627008
eip 0x8048571 0x8048571 <main+241>
eflags 0x210246 [ PF ZF IF RF ID ]
cs 0x73 115
ss 0x7b 123
ds 0x7b 123
es 0x7b 123
fs 0x0 0
gs 0x33 51
(gdb)
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34716
next prev parent reply other threads:[~2008-01-08 20:38 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-08 19:29 [Bug rtl-optimization/34716] New: " aleksey dot shipilev at gmail dot com
2008-01-08 19:36 ` [Bug rtl-optimization/34716] " aleksey dot shipilev at gmail dot com
2008-01-08 19:58 ` pinskia at gcc dot gnu dot org
2008-01-08 20:07 ` aleksey dot shipilev at gmail dot com
2008-01-08 21:21 ` aleksey dot shipilev at gmail dot com
2008-01-08 21:22 ` pinskia at gcc dot gnu dot org
2008-01-08 21:23 ` aleksey dot shipilev at gmail dot com [this message]
[not found] <bug-34716-4@http.gcc.gnu.org/bugzilla/>
2014-08-04 10:43 ` ktietz at gcc dot gnu.org
2014-08-04 10:44 ` ktietz at gcc dot gnu.org
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