Segmentation fault under Ubuntu 9.10 \ VOGONS

Segmentation fault under Ubuntu 9.10

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First post, by Varka

Posted on 2010-03-20, 22:26

Varka Offline

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I have attempted to compile Dosbox from the source available from the "Download" link at www.dosbox.com.

http://prdownloads.sourceforge.net/dosbox/dos … tar.gz?download

I'm running 32-bit Ubuntu 9.10.

I've unzipped the package, ran autogen.sh, ran configure, make, and make install, no apparant errors. I passed no parameters at all to the configure/make/etc. processes.

It installed the executable to /usr/local/bin/dosbox, but when I attempt to run the program I briefly see the dosbox splash screen and then immediately receive a "Segmentation fault" error and dosbox closes.

Ubuntu has a packaged Dosbox that works fine, but I'm trying to compile a version with MT32 support.

THanks for any assistance you can offer!

Reply 1 of 32, by Qbix

Posted on 2010-03-20, 23:08

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gdb dosbox
run
bt

Water flows down the stream
How to ask questions the smart way!

Reply 2 of 32, by Varka

Posted on 2010-03-20, 23:35

Varka Offline

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1brikeener@ubuntu:~/Downloads/dosbox-0.73/src$ gdb dosbox
2rGNU gdb (GDB) 7.0-ubuntu
3Copyright (C) 2009 Free Software Foundation, Inc.
4License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
5This is free software: you are free to change and redistribute it.
6There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
7and "show warranty" for details.
8This GDB was configured as "i486-linux-gnu".
9For bug reporting instructions, please see:
10<http://www.gnu.org/software/gdb/bugs/>...
11Reading symbols from /home/brikeener/Downloads/dosbox-0.73/src/dosbox...done.
12(gdb) run
13Starting program: /home/brikeener/Downloads/dosbox-0.73/src/dosbox 
14[Thread debugging using libthread_db enabled]
15DOSBox version 0.73
16Copyright 2002-2009 DOSBox Team, published under GNU GPL.
17---
18[New Thread 0xb3dc2b70 (LWP 9784)]
19[Thread 0xb3dc2b70 (LWP 9784) exited]
20[New Thread 0xb3dc2b70 (LWP 9785)]
21CONFIG:Loading primary settings from config file /home/brikeener/.dosbox/dosbox-0.73.conf
22
23Program received signal SIGSEGV, Segmentation fault.
24PAGING (sec=0x9f749a8) at paging.cpp:878
25878			PAGING_InitTLB();
26(gdb) bt
27#0  PAGING (sec=0x9f749a8) at paging.cpp:878
28#1  PAGING_Init (sec=0x9f749a8) at paging.cpp:890
29#2  0x08202a29 in Section::ExecuteInit (this=0x9f749a8, initall=true)
30    at setup.cpp:728
31#3  0x08202a7b in Config::Init (this=0xbffff3f0) at setup.cpp:712
32#4  0x08146bf5 in main (argc=1, argv=0xbffff504) at sdlmain.cpp:1807
33(gdb)

Reply 3 of 32, by Varka

Posted on 2010-03-20, 23:59

Varka Offline

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I re-configured with "./configure --disable-unaligned-memory" and it runs now.

It does complain that:

"opengl" is not a valid value for variable: output.
It might now be reset it to default value: surface

But I'm not losing too much sleep over that currently.

I don't really know what disable-unaligned-memory means, but since it seemed to be a memory problem I figured it was worth a shot.

Reply 4 of 32, by wd

Posted on 2010-03-21, 00:21

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Can you trace into PAGING_InitTLB() in the crashing build?

Reply 5 of 32, by Varka

Posted on 2010-03-21, 01:41

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I'm sorry, I've got zero experience using gdb and tracing applications.

I will try to figure out how to do that.

Reply 6 of 32, by Varka

Posted on 2010-03-21, 01:50

Varka Offline

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1Program received signal SIGSEGV, Segmentation fault.
2PAGING (sec=0x9f749a8) at paging.cpp:878
3878			PAGING_InitTLB();
4(gdb) step
5PAGING_InitTLB (sec=0x9f749a8) at paging.cpp:650
6650			paging.tlb.read[i]=0;
7(gdb) step
8[Thread 0xb3dc2b70 (LWP 18801) exited]
9
10Program terminated with signal SIGSEGV, Segmentation fault.
11The program no longer exists.

No idea if this is what you wanted.

1Program received signal SIGSEGV, Segmentation fault.
2PAGING (sec=0x9f749a8) at paging.cpp:878
3878			PAGING_InitTLB();
4(gdb) bt
5#0  PAGING (sec=0x9f749a8) at paging.cpp:878
6#1  PAGING_Init (sec=0x9f749a8) at paging.cpp:890
7#2  0x08202a29 in Section::ExecuteInit (this=0x9f749a8, initall=true)
8    at setup.cpp:728
9#3  0x08202a7b in Config::Init (this=0xbffff3f0) at setup.cpp:712
10#4  0x08146bf5 in main (argc=1, argv=0xbffff504) at sdlmain.cpp:1807
11(gdb) step
12PAGING_InitTLB (sec=0x9f749a8) at paging.cpp:650
13650			paging.tlb.read[i]=0;
14(gdb) bt
15#0  PAGING_InitTLB (sec=0x9f749a8) at paging.cpp:650
16#1  PAGING (sec=0x9f749a8) at paging.cpp:878
17#2  PAGING_Init (sec=0x9f749a8) at paging.cpp:890
18#3  0x08202a29 in Section::ExecuteInit (this=0x9f749a8, initall=true)
19    at setup.cpp:728
20#4  0x08202a7b in Config::Init (this=0xbffff3f0) at setup.cpp:712
21#5  0x08146bf5 in main (argc=1, argv=0xbffff504) at sdlmain.cpp:1807
22(gdb) step

Reply 7 of 32, by wd

Posted on 2010-03-21, 15:46

wd Offline

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Load the app in gdb, then use "break PAGING_InitTLB" then run until the breakpoint is hit.
Use step as you did to trace into the function, though it should break at the for loop
at first (be sure you have optimizations turned off when compiling dosbox).

You can use "p i" and similar to check the content of variables.

Reply 8 of 32, by Varka

Posted on 2010-03-21, 22:04

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1brikeener@ubuntu:~/Downloads/dosbox-0.73/src$ gdb dosbox
2GNU gdb (GDB) 7.0-ubuntu
3Copyright (C) 2009 Free Software Foundation, Inc.
4License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
5This is free software: you are free to change and redistribute it.
6There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
7and "show warranty" for details.
8This GDB was configured as "i486-linux-gnu".
9For bug reporting instructions, please see:
10<http://www.gnu.org/software/gdb/bugs/>...
11Reading symbols from /home/brikeener/Downloads/dosbox-0.73/src/dosbox...done.
12(gdb) break PAGING_InitTLB
13Breakpoint 1 at 0x8066198: file paging.cpp, line 650.
14(gdb) run
15Starting program: /home/brikeener/Downloads/dosbox-0.73/src/dosbox 
16[Thread debugging using libthread_db enabled]
17DOSBox version 0.73
18Copyright 2002-2009 DOSBox Team, published under GNU GPL.
19---
20[New Thread 0xb3dc2b70 (LWP 5342)]
21[Thread 0xb3dc2b70 (LWP 5342) exited]
22[New Thread 0xb3dc2b70 (LWP 5343)]
23CONFIG:Loading primary settings from config file /home/brikeener/.dosbox/dosbox-0.73.conf
24
25Program received signal SIGSEGV, Segmentation fault.
26PAGING (sec=0x9f779a8) at paging.cpp:878
27878			PAGING_InitTLB();
28(gdb) step
29PAGING_InitTLB (sec=0x9f779a8) at paging.cpp:650
30650			paging.tlb.read[i]=0;
31(gdb) step
32[Thread 0xb3dc2b70 (LWP 5343) exited]
33
34Program terminated with signal SIGSEGV, Segmentation fault.
35The program no longer exists.
36(gdb)

I don't think I did it right. I also couldn't figure out how to disable optimization during compile, googling it again right now.

Reply 9 of 32, by wd

Posted on 2010-03-21, 22:10

wd Offline

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Use CFLAGS and CXXFLAGS for that (try "printenv | sort" to check for the currently used flags setting).

Like
export CFLAGS="-g"
followed by ./configure

Reply 10 of 32, by Varka

Posted on 2010-03-21, 23:05

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I'll get to the optimization a little later, but for now something strange:

If I install the Ubuntu dosbox package, I can execute it just fine.

BUT, if I copy the Ubuntu-supplied dosbox executable anywhere else on the system, I get a segmentation fault. Same executable, different location.

Just thought that was strange...

Reply 11 of 32, by Varka

Posted on 2010-03-21, 23:31

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OK, maybe this is useful.

1bkeener@ubuntu:~/Downloads/dosbox-0.73/src$ gdb dosbox
2GNU gdb (GDB) 7.0-ubuntu
3Copyright (C) 2009 Free Software Foundation, Inc.
4License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
5This is free software: you are free to change and redistribute it.
6There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
7and "show warranty" for details.
8This GDB was configured as "i486-linux-gnu".
9For bug reporting instructions, please see:
10<http://www.gnu.org/software/gdb/bugs/>...
11Reading symbols from /home/bkeener/Downloads/dosbox-0.73/src/dosbox...done.
12(gdb) break PAGING_InitTLB
13Breakpoint 1 at 0x8073a88: file paging.cpp, line 649.
14(gdb) run
15Starting program: /home/bkeener/Downloads/dosbox-0.73/src/dosbox 
16[Thread debugging using libthread_db enabled]
17DOSBox version 0.73
18Copyright 2002-2009 DOSBox Team, published under GNU GPL.
19---
20[New Thread 0xb3dc2b70 (LWP 10818)]
21[Thread 0xb3dc2b70 (LWP 10818) exited]
22[New Thread 0xb3dc2b70 (LWP 10819)]
23CONFIG:Loading primary settings from config file /home/bkeener/.dosbox/dosbox-0.73.conf
24
25Breakpoint 1, PAGING_InitTLB () at paging.cpp:649
26649		for (Bitu i=0;i<TLB_SIZE;i++) {
27(gdb) p i
28$1 = 3221222120
29(gdb) step
30650			paging.tlb.read[i]=0;
31(gdb) p i
32$2 = 0
33(gdb) step
34651			paging.tlb.write[i]=0;
35(gdb) p i
36$3 = 0
37(gdb) step
38652			paging.tlb.readhandler[i]=&init_page_handler;
39(gdb) p i
40$4 = 0
41(gdb) step
42653			paging.tlb.writehandler[i]=&init_page_handler;
43(gdb) p i
44$5 = 0
45(gdb) step
46649		for (Bitu i=0;i<TLB_SIZE;i++) {
47(gdb) p i
48$6 = 0
49(gdb) step
50650			paging.tlb.read[i]=0;
51(gdb) p i
52$7 = 1
53(gdb) step
54651			paging.tlb.write[i]=0;
55(gdb) p i
56$8 = 1
57(gdb) step
58652			paging.tlb.readhandler[i]=&init_page_handler;
59(gdb) p i
60$9 = 1

…Show last 42 lines

61(gdb) step
62653			paging.tlb.writehandler[i]=&init_page_handler;
63(gdb) p i
64$10 = 1
65(gdb) step
66649		for (Bitu i=0;i<TLB_SIZE;i++) {
67(gdb) p i
68$11 = 1
69(gdb) step
70650			paging.tlb.read[i]=0;
71(gdb) p i
72$12 = 2
73(gdb) step
74651			paging.tlb.write[i]=0;
75(gdb) p i
76$13 = 2
77(gdb) step
78652			paging.tlb.readhandler[i]=&init_page_handler;
79(gdb) p i
80$14 = 2
81(gdb) step
82653			paging.tlb.writehandler[i]=&init_page_handler;
83(gdb) p i
84$15 = 2
85(gdb) step
86649		for (Bitu i=0;i<TLB_SIZE;i++) {
87(gdb) continue
88Continuing.
89
90Program received signal SIGSEGV, Segmentation fault.
910x08073a97 in PAGING_InitTLB () at paging.cpp:650
92650			paging.tlb.read[i]=0;
93
94(gdb) bt
95#0  0x08073a97 in PAGING_InitTLB () at paging.cpp:650
96#1  0x080761cf in PAGING (this=0xa102068, configuration=0xa0b69a8) at paging.cpp:878
97#2  0x08073ffb in PAGING_Init (sec=0xa0b69a8) at paging.cpp:890
98#3  0x08330854 in Section::ExecuteInit (this=0xa0b69a8, initall=true) at setup.cpp:728
99#4  0x08330715 in Config::Init (this=0xbffff3cc) at setup.cpp:712
100#5  0x081c5494 in main (argc=1, argv=0xbffff4d4) at sdlmain.cpp:1807
101(gdb)

It looked like it was just looping on lines 649-652, so I got bored and looked up the "continue" command.

Oh, also, the value of "i" is consistently 268700 after the crash.

Program received signal SIGSEGV, Segmentation fault.
0x08073a97 in PAGING_InitTLB () at paging.cpp:650
650 paging.tlb.read=0;
(gdb) p i
$1 = 268700

I can arrange a VNC/ssh/nx machine session if that would make things easier.

Reply 12 of 32, by wd

Posted on 2010-03-21, 23:46

wd Offline

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Does "p i" work at the crash point, where you did the backtrace?

Reply 13 of 32, by Varka

Posted on 2010-03-21, 23:53

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Even MORE strange things:

I configured and installed dosbox from source to /usr/bin/dosbox.

If I execute "dosbox" from a console, it runs.

If I execute /usr/bin/dosbox it crashes.

If I use "gdb dosbox" and then "run" from a console, it crashes.

What wierd crap.

1bkeener@ubuntu:/$ which dosbox
2/usr/bin/dosbox
3bkeener@ubuntu:~$ md5sum /usr/bin/dosbox
4224bfd311780410c69943bb44a02ece9  /usr/bin/dosbox
5bkeener@ubuntu:~$ md5sum Downloads/dosbox-0.73/src/dosbox
6224bfd311780410c69943bb44a02ece9  Downloads/dosbox-0.73/src/dosbox

I also moved /usr/bin/dosbox to /bin/dosbox, and it runs fine, UNTIL I explicitly specify /bin/dosbox as the executable, at which point it has the EXACT same problem.

I think it's something fudged up with Ubuntu 9.10. I don't have this problem with Mandriva, but this is a fresh, factory-default install of Ubuntu, so I don't know what could be wrong!

Reply 14 of 32, by Varka

Posted on 2010-03-21, 23:55

Varka Offline

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wd wrote:
Does "p i" work at the crash point, where you did the backtrace?

0x08073a97 in PAGING_InitTLB () at paging.cpp:650
650 paging.tlb.read=0;
(gdb) p i
$1 = 268700

It's always 268700.

Reply 15 of 32, by wd

Posted on 2010-03-21, 23:57

wd Offline

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Your box is too strange, that all does not make any sense 😀

Reply 16 of 32, by Varka

Posted on 2010-03-22, 00:01

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Yeah, tell me about it. Makes NO damn sense at all.

I'm just gonna go back to Mandriva. This whole thing makes me cry a little on the inside.

Now I have to figure out why I get thousands of "buffer underrun" errors with Munt in Mandriva, though. Makes mt32d unusable.

Everything works perfectly under Windows, I installed timidity++ synth and munt, sounds magnificent, but I prefer to run with the LEENUX

Reply 17 of 32, by Varka

Posted on 2010-03-23, 19:24

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I re-installed ubuntu and everything APPEARS to be functional now...

Reply 18 of 32, by Varka

Posted on 2010-03-24, 04:03

Varka Offline

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Problem cropped up again.

Reply 19 of 32, by Qbix

Posted on 2010-03-24, 06:48

Qbix Offline

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which version of GCC ?

Water flows down the stream
How to ask questions the smart way!

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