Bug 251849

Thank you for your bug report!

(In reply to comment #0)
> $ uname -a
> Linux pc-linux 2.6.21-1.3228.fc7 #1 SMP Tue Jun 12 14:56:37 EDT 2007 x86_64
> x86_64 x86_64 GNU/Linux

Would you be willing to update your whole system first? Your kernel is a bit
old. I presume that other packages can be outdated, too.

Please run as root:

yum update

> --- SIGSEGV (Segmentation fault) @ 0 (0) ---
> +++ killed by SIGSEGV +++

Could you install gdb, qps-debuginfo and qt-debuginfo packages [1] and paste
here stack trace [2], please?

Run first:

gdb qps

then type:

run

and after application crash:

thread apply all bt

[1] debuginfo packages can be found here:
http://download.fedora.redhat.com/pub/fedora/linux/releases/7/Everything/x86_64/debug/
http://download.fedora.redhat.com/pub/fedora/linux/updates/7/x86_64/debug/
[2] http://fedoraproject.org/wiki/StackTraces

In fact, I was up to date (last kernel 2.6.22.1-41.fc7 does not with my wireless
usb key). 

After applying the requested commands, here is the result (run under
kernel-2.6.22.1-41.fc7) : 
$ gdb qps
GNU gdb Red Hat Linux (6.6-15.fc7rh)
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu"...
Using host libthread_db library "/lib64/libthread_db.so.1".
(gdb) run
Starting program: /usr/bin/qps 
[Thread debugging using libthread_db enabled]
[New Thread 46912496295040 (LWP 3141)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 46912496295040 (LWP 3141)]
0x00000036c8679bdc in rawmemchr () from /lib64/libc.so.6
(gdb) thread apply all bt

Thread 1 (Thread 46912496295040 (LWP 3141)):
#0  0x00000036c8679bdc in rawmemchr () from /lib64/libc.so.6
#1  0x00000036c866d7ca in _IO_str_init_static_internal () from /lib64/libc.so.6
#2  0x00000036c86620c5 in vsscanf () from /lib64/libc.so.6
#3  0x00000036c865d3f8 in sscanf () from /lib64/libc.so.6
#4  0x000000000041fe0d in Procinfo::read_common () at proc.cpp:723
#5  0x00000000004229c0 in Proc::refresh (this=0x6) at proc.cpp:1381
#6  0x0000000000423c1d in Procview::refresh (this=0x966c50)
    at proc_common.cpp:266
#7  0x000000000041ddb0 in Pstable::refresh (this=0x967000) at pstable.cpp:373
#8  0x0000000000415042 in Qps::set_table_mode (this=0x9204a0, treemode=true)
    at qps.cpp:866
#9  0x000000000041a10a in Qps (this=0x9204a0) at qps.cpp:282
#10 0x000000000041a94f in main (argc=1, argv=0x7fff68c1b338, 
    envp=<value optimized out>) at qps.cpp:2004
#11 0x00000036c861dab4 in __libc_start_main () from /lib64/libc.so.6
#12 0x0000000000414789 in _start ()

Created attachment 161139 [details]
Stack trace from a generated coredump

See a stack trace after allowing core dump creation
It should also help.

OK, I found where the problem is: on some systems /proc/stats is bigger than
4096 chars so the whole content could not fit into "buf" buffer
[proc_linux.cpp:Procinfo::read_common()].

In line 723 and 724 of proc_linux.cpp we have these lines:

        p = strstr(buf, "btime") + 6;
        sscanf(p, "%lu", &boot_time);

Because buf variable did not contain "btime" string, strstr() returned NULL.
That's why sscanf caused segmentation fault. I'll contact with upstream developer.

Version 1.9.20 has this bug fixed.

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Fedora 7 changed to end-of-life (EOL) status on June 13, 2008. 
Fedora 7 is no longer maintained, which means that it will not 
receive any further security or bug fix updates. As a result we 
are closing this bug. 

If you can reproduce this bug against a currently maintained version 
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Thank you for reporting this bug and we are sorry it could not be fixed.

Fixed in qps-1.10.2-1