Issue

• blkid takes very long to return when run on a system with more than 128 block devices attached an called without any arguments.

• When blkid is called with an empty cache and a list of block devices (>128 again) it fails with a dump or segmentation fault:

root@blnfj1444 # blkid -c /dev/null /dev/sda* /dev/sdb* /dev/sdc*
/dev/sdd* /dev/cciss/c0d0* /dev/cciss/c0d1* /dev/cciss/c0d2* /dev/x*
/dev/sda1: LABEL="BOOT" UUID="cb1182ac-ceb4-46fe-b6b5-007746bc6209" SEC_TYPE="ext2" TYPE="ext3"
[...]
/dev/sddz: LABEL="" TYPE="oracleasm"
*** glibc detected *** blkid: munmap_chunk(): invalid pointer: 0x00007fffcec00be0 ***
======= Backtrace: =========
/lib64/libc.so.6(cfree+0x166)[0x2b33477469d6]
blkid[0x40134a]
/lib64/libc.so.6(__libc_start_main+0xf4)[0x2b33476f1994]
blkid[0x400df9]
======= Memory map: ========
00400000-00402000 r-xp 00000000 08:11 553374                             /sbin/blkid
00601000-00602000 rw-p 00001000 08:11 553374                             /sbin/blkid
1d164000-1d196000 rw-p 1d164000 00:00 0                                  [heap]
2b3346e86000-2b3346ea2000 r-xp 00000000 08:11 1887619                    /lib64/ld-2.5.so
2b3346ea2000-2b3346ea5000 rw-p 2b3346ea2000 00:00 0
2b33470a1000-2b33470a2000 r--p 0001b000 08:11 1887619                    /lib64/ld-2.5.so
[...]
2b3348521000-2b3348522000 rw-p 0000d000 08:11 1887853                    /lib64/libgcc_s-4.1.2-20080825.so.1
7fffcebec000-7fffcec01000 rw-p 7ffffffe9000 00:00 0                      [stack]
7fffced49000-7fffced4d000 r-xp 7fffced49000 00:00 0                      [vdso]
ffffffffff600000-ffffffffffe00000 ---p 00000000 00:00 0                  [vsyscall]
Aborted

**********************************
root@blnfj1444 # blkid -c
/dev/null /dev/sda* /dev/sdb* /dev/sdc* /dev/sdd* /dev/cciss/c0d0*
/dev/cciss/c0d1* /dev/cciss/c0d2* /dev/cciss/c0d3*
/dev/sda1: LABEL="BOOT" UUID="cb1182ac-ceb4-46fe-b6b5-007746bc6209" SEC_TYPE="ext2" TYPE="ext3"
/dev/sda2: LABEL="ADVOS0" UUID="52da8bf0-deb7-469f-baa2-00e0e2a699f9" SEC_TYPE="ext2" TYPE="ext3"
/dev/sda3: LABEL="ADVAPPL0" UUID="03a56d9b-477f-42f7-9a84-bf9298de3f43" SEC_TYPE="ext2" TYPE="ext3"
/dev/sda5: LABEL="ADVDATABASE" UUID="2e2f8e8b-8670-44b8-9fd3-0d38a72d7a7b" TYPE="ext3"
/dev/sda6: LABEL="ADVOS0.eh" UUID="c2726e19-e0e2-490e-ac58-7985be09b94d" SEC_TYPE="ext2" TYPE="ext3"
/dev/sda7: LABEL="TMP" UUID="a5d01a7c-9050-4e31-adbf-fca6012fcfe6" TYPE="ext3"
/dev/sda8: LABEL="ADVOS0.var" UUID="f6e4a635-e3c7-4a4b-8e0f-16f7c51361f0" SEC_TYPE="ext2" TYPE="ext3"
/dev/sdab: LABEL="" TYPE="oracleasm"
/dev/sdad: LABEL="" TYPE="oracleasm"
...
/dev/sddx: LABEL="" TYPE="oracleasm"
/dev/sddz: LABEL="" TYPE="oracleasm"
*** glibc detected *** blkid: munmap_chunk(): invalid pointer: 0x00007fffa9db5bd7 ***
======= Backtrace: =========
/lib64/libc.so.6(cfree+0x166)[0x2aba28e839d6]
blkid[0x40134a]
/lib64/libc.so.6(__libc_start_main+0xf4)[0x2aba28e2e994]
blkid[0x400df9]
======= Memory map: ========
00400000-00402000 r-xp 00000000 08:11 553374                             /sbin/blkid
00601000-00602000 rw-p 00001000 08:11 553374                             /sbin/blkid
0abb7000-0abe9000 rw-p 0abb7000 00:00 0                                  [heap]
2aba285c3000-2aba285df000 r-xp 00000000 08:11 1887619                    /lib64/ld-2.5.so
2aba285df000-2aba285e2000 rw-p 2aba285df000 00:00 0
...
2aba29a51000-2aba29a5e000 r-xp 00000000 08:11 1887853                    /lib64/libgcc_s-4.1.2-20080825.so.1
2aba29a5e000-2aba29c5e000 ---p 0000d000 08:11 1887853                    /lib64/libgcc_s-4.1.2-20080825.so.1
2aba29c5e000-2aba29c5f000 rw-p 0000d000 08:11 1887853                    /lib64/libgcc_s-4.1.2-20080825.so.1
7fffa9da1000-7fffa9db6000 rw-p 7ffffffe9000 00:00 0                      [stack]
7fffa9dfc000-7fffa9e00000 r-xp 7fffa9dfc000 00:00 0                      [vdso]
ffffffffff600000-ffffffffffe00000 ---p 00000000 00:00 0                  [vsyscall]
Aborted

**************************************
root@blnfj1444 # blkid
-c /dev/null /dev/sda* /dev/sdb* /dev/sdc* /dev/sdd* /dev/cciss/c0d0*
/dev/cciss/c0d1* /dev/cciss/c0d2* /dev/sdd*
Segmentation fault