I wrote a script to create lots of iscsi volumes on loop devices.

Seems to run fine up to 111, and then tgtd crashes and tgtadm
gets a buffer overflow.

The script I used to create the problem and a capture of the
crash is attached.

I'm using standard RPMs on Fedora 10, kernel
Linux iSCSi-test 2.6.27.15-170.2.24.fc10.x86_64 #1 SMP Wed Feb 11 23:14:31 EST 
2009 x86_64 x86_64 x86_64 GNU/Linux

Let me know if I can provide any additional info.

Thanks,
Ben

-- 
Ben Greear <gree...@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com


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# Found this in /var/log/messages

tgtd[2665]: segfault at 90 ip 0000003185c0c231 sp 00007fff7528fab0 error 4 in
libpthread-2.9.so[3185c00000+17000]



# This is output from my script as it's createing things.
...
Running -:tgtadm --lld iscsi --op new --mode logicalunit --tid 111 --lun 1 -b 
/dev/loop111:-
Running -:tgtadm --lld iscsi --op bind --mode target --tid 111 -I ALL:-
Running -:cp /export/iscsi/disk.100m.ext3 /export/iscsi/disk112:-
Running -:losetup /dev/loop112 /export/iscsi/disk112:-
Running -:tgtadm --lld iscsi --op new --mode target --tid=112 --targetname 
iqn.2009-02.com.lanforge:for.all.112:-
Running -:tgtadm --lld iscsi --op new --mode logicalunit --tid 112 --lun 1 -b 
/dev/loop112:-
*** buffer overflow detected ***: tgtadm terminated
======= Backtrace: =========
/lib64/libc.so.6(__fortify_fail+0x37)[0x31850ff4c7]
/lib64/libc.so.6[0x31850fd370]
/lib64/libc.so.6(__read_chk+0x28)[0x31850fd8a8]
tgtadm[0x4010be]
tgtadm[0x401f17]
/lib64/libc.so.6(__libc_start_main+0xe6)[0x318501e576]
tgtadm[0x400c59]
======= Memory map: ========
00400000-00404000 r-xp 00000000 fd:00 834180                             
/usr/sbin/tgtadm
00603000-00605000 rw-p 00003000 fd:00 834180                             
/usr/sbin/tgtadm
00b05000-00b28000 rw-p 00b05000 00:00 0                                  [heap]
3183c00000-3183c20000 r-xp 00000000 fd:00 3760356                        
/lib64/ld-2.9.so
3183e1f000-3183e20000 r--p 0001f000 fd:00 3760356                        
/lib64/ld-2.9.so
3183e20000-3183e21000 rw-p 00020000 fd:00 3760356                        
/lib64/ld-2.9.so
3185000000-3185168000 r-xp 00000000 fd:00 3760461                        
/lib64/libc-2.9.so
3185168000-3185368000 ---p 00168000 fd:00 3760461                        
/lib64/libc-2.9.so
3185368000-318536c000 r--p 00168000 fd:00 3760461                        
/lib64/libc-2.9.so
318536c000-318536d000 rw-p 0016c000 fd:00 3760461                        
/lib64/libc-2.9.so
318536d000-3185372000 rw-p 318536d000 00:00 0 
3192a00000-3192a16000 r-xp 00000000 fd:00 3760493                        
/lib64/libgcc_s-4.3.2-20081105.so.1
3192a16000-3192c16000 ---p 00016000 fd:00 3760493                        
/lib64/libgcc_s-4.3.2-20081105.so.1
3192c16000-3192c17000 rw-p 00016000 fd:00 3760493                        
/lib64/libgcc_s-4.3.2-20081105.so.1
7f1af8b10000-7f1af8b12000 rw-p 7f1af8b10000 00:00 0 
7f1af8b28000-7f1af8b2a000 rw-p 7f1af8b28000 00:00 0 
7fff00b14000-7fff00b29000 rw-p 7ffffffea000 00:00 0                      [stack]
7fff00bfe000-7fff00bff000 r-xp 7fff00bfe000 00:00 0                      [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  
[vsyscall]
Running -:tgtadm --lld iscsi --op bind --mode target --tid 112 -I ALL:-
tgtadm: can't connect to the tgt daemon, Connection refused
tgtadm: can't send the request to the tgt daemon, Transport endpoint is not 
connected
Running -:cp /export/iscsi/disk.100m.ext3 /export/iscsi/disk113:-
Running -:losetup /dev/loop113 /export/iscsi/disk113:-
Running -:tgtadm --lld iscsi --op new --mode target --tid=113 --targetname 
iqn.2009-02.com.lanforge:for.all.113:-
tgtadm: can't connect to the tgt daemon, Connection refused
tgtadm: can't send the request to the tgt daemon, Transport endpoint is not 
connected
Running -:tgtadm --lld iscsi --op new --mode logicalunit --tid 113 --lun 1 -b 
/dev/loop113:-
tgtadm: can't connect to the tgt daemon, Connection refused
tgtadm: can't send the request to the tgt daemon, Transport endpoint is not 
connected
Running -:tgtadm --lld iscsi --op bind --mode target --tid 113 -I ALL:-
tgtadm: can't connect to the tgt daemon, Connection refused
tgtadm: can't send the request to the tgt daemon, Transport endpoint is not 
connected
............

Attachment: create_iscsi_targets.pl
Description: Perl program

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