Description: I cannot use xfce's plugin for sensors. I have started the sensors service and the sensors command from the shell works normally, but the plugin crashes

Additional info:
* package version(s) extra/xfce4-sensors-plugin 1.2.3-1, Linux 2.6.39-ARCH #1

Steps to reproduce:
[user@gandalf ~]$ xfce4-sensors
*** glibc detected *** xfce4-sensors: double free or corruption (fasttop): 0x0000000000d69720 ***
======= Backtrace: =========
/lib/libc.so.6(+0x7366a)[0x7ff514a1b66a]
/lib/libc.so.6(cfree+0x6c)[0x7ff514a1f54c]
/usr/lib/xfce4/modules/libxfce4sensors.so.1(get_hddtemp_value+0xb8)[0x7ff515eb37a8]
/usr/lib/xfce4/modules/libxfce4sensors.so.1(remove_unmonitored_drives+0x4b)[0x7ff515eb387b]
/usr/lib/xfce4/modules/libxfce4sensors.so.1(initialize_hddtemp+0xdb)[0x7ff515eb39fb]
/usr/lib/xfce4/modules/libxfce4sensors.so.1(initialize_all+0x36)[0x7ff515eb06b6]
/usr/lib/xfce4/modules/libxfce4sensors.so.1(sensors_new+0x44)[0x7ff515eb1584]
xfce4-sensors[0x40211a]
xfce4-sensors[0x401f37]
/lib/libc.so.6(__libc_start_main+0xed)[0x7ff5149c917d]
xfce4-sensors[0x401fe1]
======= Memory map: ========
00400000-00404000 r-xp 00000000 08:01 527186 /usr/bin/xfce4-sensors
00603000-00604000 rw-p 00003000 08:01 527186 /usr/bin/xfce4-sensors
00ced000-00d95000 rw-p 00000000 00:00 0 [heap]
7ff508000000-7ff508021000 rw-p 00000000 00:00 0
7ff508021000-7ff50c000000 ---p 00000000 00:00 0
7ff50d535000-7ff50d54a000 r-xp 00000000 08:01 590119 /usr/lib/libgcc_s.so.1
7ff50d54a000-7ff50d74a000 ---p 00015000 08:01 590119 /usr/lib/libgcc_s.so.1
7ff50d74a000-7ff50d74b000 rw-p 00015000 08:01 590119 /usr/lib/libgcc_s.so.1
7ff50d74b000-7ff50d754000 r-xp 00000000 08:01 923145 /usr/lib/gtk-2.0/2.10.0/engines/libxfce.so
7ff50d754000-7ff50d953000 ---p 00009000 08:01 923145 /usr/lib/gtk-2.0/2.10.0/engines/libxfce.so
7ff50d953000-7ff50d954000 rw-p 00008000 08:01 923145 /usr/lib/gtk-2.0/2.10.0/engines/libxfce.so
7ff50d954000-7ff50d95d000 r-xp 00000000 08:01 558449 /usr/lib/libltdl.so.7.3.0
7ff50d95d000-7ff50db5c000 ---p 00009000 08:01 558449 /usr/lib/libltdl.so.7.3.0
7ff50db5c000-7ff50db5d000 rw-p 00008000 08:01 558449 /usr/lib/libltdl.so.7.3.0
7ff50db5d000-7ff50db6d000 r-xp 00000000 08:01 531070 /usr/lib/libtdb.so.1.2.9
7ff50db6d000-7ff50dd6d000 ---p 00010000 08:01 531070 /usr/lib/libtdb.so.1.2.9
7ff50dd6d000-7ff50dd6e000 rw-p 00010000 08:01 531070 /usr/lib/libtdb.so.1.2.9
7ff50dd6e000-7ff50dd73000 r-xp 00000000 08:01 540351 /usr/lib/libogg.so.0.7.1
7ff50dd73000-7ff50df73000 ---p 00005000 08:01 540351 /usr/lib/libogg.so.0.7.1
7ff50df73000-7ff50df74000 rw-p 00005000 08:01 540351 /usr/lib/libogg.so.0.7.1
7ff50df74000-7ff50df9f000 r-xp 00000000 08:01 545449 /usr/lib/libvorbis.so.0.4.5
7ff50df9f000-7ff50e19e000 ---p 0002b000 08:01 545449 /usr/lib/libvorbis.so.0.4.5
7ff50e19e000-7ff50e19f000 rw-p 0002a000 08:01 545449 /usr/lib/libvorbis.so.0.4.5
7ff50e19f000-7ff50e1a6000 r-xp 00000000 08:01 545448 /usr/lib/libvorbisfile.so.3.3.4
7ff50e1a6000-7ff50e3a5000 ---p 00007000 08:01 545448 /usr/lib/libvorbisfile.so.3.3.4
7ff50e3a5000-7ff50e3a6000 rw-p 00006000 08:01 545448 /usr/lib/libvorbisfile.so.3.3.4
7ff50e3a6000-7ff50e3b6000 r-xp 00000000 08:01 566321 /usr/lib/libcanberra.so.0.2.5
7ff50e3b6000-7ff50e5b5000 ---p 00010000 08:01 566321 /usr/lib/libcanberra.so.0.2.5
7ff50e5b5000-7ff50e5b6000 rw-p 0000f000 08:01 566321 /usr/lib/libcanberra.so.0.2.5
7ff50e5b6000-7ff50e5ba000 r-xp 00000000 08:01 582124 /usr/lib/libcanberra-gtk.so.0.1.8
7ff50e5ba000-7ff50e7b9000 ---p 00004000 08:01 582124 /usr/lib/libcanberra-gtk.so.0.1.8
7ff50e7b9000-7ff50e7ba000 rw-p 00003000 08:01 582124 /usr/lib/libcanberra-gtk.so.0.1.8
7ff50e7ba000-7ff50e7bf000 r-xp 00000000 08:01 923954 /usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so
7ff50e7bf000-7ff50e9be000 ---p 00005000 08:01 923954 /usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so
7ff50e9be000-7ff50e9bf000 rw-p 00004000 08:01 923954 /usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so
7ff50e9bf000-7ff50e9cb000 r-xp 00000000 08:01 655489 /lib/libnss_files-2.14.so
7ff50e9cb000-7ff50ebca000 ---p 0000c000 08:01 655489 /lib/libnss_files-2.14.so
7ff50ebca000-7ff50ebcb000 r--p 0000b000 08:01 655489 /lib/libnss_files-2.14.so
7ff50ebcb000-7ff50ebcc000 rw-p 0000c000 08:01 655489 /lib/libnss_files-2.14.so
7ff50ebcc000-7ff50ebd1000 r-xp 00000000 08:01 543182 /usr/lib/libXdmcp.so.6.0.0
7ff50ebd1000-7ff50edd0000 ---p 00005000 08:01 543182 /usr/lib/libXdmcp.so.6.0.0
7ff50edd0000-7ff50edd1000 rw-p 00004000 08:01 543182 /usr/lib/libXdmcp.so.6.0.0
7ff50edd1000-7ff50edd3000 r-xp 00000000 08:01 546000 /usr/lib/libXau.so.6.0.0
7ff50edd3000-7ff50efd2000 ---p 00002000 08:01 546000 /usr/lib/libXau.so.6.0.0
7ff50efd2000-7ff50efd3000 rw-p 00001000 08:01 546000 /usr/lib/libXau.so.6.0.0
7ff50efd3000-7ff50efd4000 r-xp 00000000 08:01 543161 /usr/lib/libX11-xcb.so.1.0.0
7ff50efd4000-7ff50f1d3000 ---p 00001000 08:01 543161 /usr/lib/libX11-xcb.so.1.0.0
7ff50f1d3000-7ff50f1d4000 rw-p 00000000 08:01 543161 /usr/lib/libX11-xcb.so.1.0.0
7ff50f1d4000-7ff50f1d6000 r-xp 00000000 08:01 547198 /usr/lib/libxcb-aux.so.0.0.0
7ff50f1d6000-7ff50f3d6000 ---p 00002000 08:01 547198 /usr/lib/libxcb-aux.so.0.0.0
7ff50f3d6000-7ff50f3d7000 rw-p 00002000 08:01 547198 /usr/lib/libxcb-aux.so.0.0.0
7ff50f3d7000-7ff50f3f2000 r-xp 00000000 08:01 545766 /usr/lib/libxcb.so.1.1.0
7ff50f3f2000-7ff50f5f1000 ---p 0001b000 08:01 545766 /usr/lib/libxcb.so.1.1.0
7ff50f5f1000-7ff50f5f2000 rw-p 0001a000 08:01 545766 /usr/lib/libxcb.so.1.1.0
7ff50f5f2000-7ff50f5f5000 r-xp 00000000 08:01 723023 /lib/libuuid.so.1.3.0
7ff50f5f5000-7ff50f7f5000 ---p 00003000 08:01 723023 /lib/libuuid.so.1.3.0
7ff50f7f5000-7ff50f7f6000 rw-p 00003000 08:01 723023 /lib/libuuid.so.1.3.0
7ff50f7f6000-7ff50f809000 r-xp 00000000 08:01 655517 /lib/libresolv-2.14.so
7ff50f809000-7ff50fa09000 ---p 00013000 08:01 655517 /lib/libresolv-2.14.so
7ff50fa09000-7ff50fa0a000 r--p 00013000 08:01 655517 /lib/libresolv-2.14.so
7ff50fa0a000-7ff50fa0b000 rw-p 00014000 08:01 655517 /lib/libresolv-2.14.so
7ff50fa0b000-7ff50fa0d000 rw-p 00000000 00:00 0
7ff50fa0d000-7ff50fa0f000 r-xp 00000000 08:01 671654 /lib/libdl-2.14.so
7ff50fa0f000-7ff50fc0f000 ---p 00002000 08:01 671654 /lib/libdl-2.14.so
7ff50fc0f000-7ff50fc10000 r--p 00002000 08:01 671654 /lib/libdl-2.14.so
7ff50fc10000-7ff50fc11000 rw-p 00003000 08:01 671654 /lib/libdl-2.14.so
7ff50fc11000-7ff50fc38000 r-xp 00000000 08:01 527250 /usr/lib/libexpat.so.1.5.2
7ff50fc38000-7ff50fe37000 ---p 00027000 08:01 527250 /usr/lib/libexpat.so.1.5.2
7ff50fe37000-7ff50fe3a000 rw-p 00026000 08:01 527250 /usr/lib/libexpat.so.1.5.2
7ff50fe3a000-7ff50fe52000 r-xp 00000000 08:01 545824 /usr/lib/libz.so.1.2.5
7ff50fe52000-7ff510051000 ---p 00018000 08:01 545824 /usr/lib/libz.so.1.2.5
7ff510051000-7ff510052000 rw-p 00017000 08:01 545824 /usr/lib/libz.so.1.2.5
7ff510052000-7ff5100c1000 r-xp 00000000 08:01 563609 /usr/lib/libpixman-1.so.0.22.0
7ff5100c1000-7ff5102c1000 ---p 0006f000 08:01 563609 /usr/lib/libpixman-1.so.0.22.0
7ff5102c1000-7ff5102c6000 rw-p 0006f000 08:01 563609 /usr/lib/libpixman-1.so.0.22.0
7ff5102c6000-7ff510301000 r-xp 00000000 08:01 680143 /lib/libpcre.so.0.0.1
7ff510301000-7ff510500000 ---p 0003b000 08:01 680143 /lib/libpcre.so.0.0.1
7ff510500000-7ff510501000 rw-p 0003a000 08:01 680143 /lib/libpcre.so.0.0.1
7ff510501000-7ff510506000 r-xp 00000000 08:01 568135 /usr/lib/libXfixes.so.3.1.0
7ff510506000-7ff510706000 ---p 00005000 08:01 568135 /usr/lib/libXfixes.so.3.1.0
7ff510706000-7ff510707000 rw-p 00005000 08:01 568135 /usr/lib/libXfixes.so.3.1.0
7ff510707000-7ff510709000 r-xp 00000000 08:01 546006 /usr/lib/libXdamage.so.1.1.0
7ff510709000-7ff510908000 ---p 00002000 08:01 546006 /usr/lib/libXdamage.so.1.1.0
7ff510908000-7ff510909000 rw-p 00001000 08:01 546006 /usr/lib/libXdamage.so.1.1.0
7ff510909000-7ff51090b000 r-xp 00000000 08:01 543175 /usr/lib/libXcomposite.so.1.0.0
7ff51090b000-7ff510b0a000 ---p 00002000 08:01 543175 /usr/lib/libXcomposite.so.1.0.0
7ff510b0a000-7ff510b0b000 rw-p 00001000 08:01 543175 /usr/lib/libXcomposite.so.1.0.0
7ff510b0b000-7ff510b14000 r-xp 00000000 08:01 532048 /usr/lib/libXcursor.so.1.0.2
7ff510b14000-7ff510d14000 ---p 00009000 08:01 532048 /usr/lib/libXcursor.so.1.0.2
7ff510d14000-7ff510d15000 rw-p 00009000 08:01 532048 /usr/lib/libXcursor.so.1.0.2
7ff510d15000-7ff510d1d000 r-xp 00000000 08:01 543205 /usr/lib/libXrandr.so.2.2.0
7ff510d1d000-7ff510f1c000 ---p 00008000 08:01 543205 /usr/lib/libXrandr.so.2.2.0
7ff510f1c000-7ff510f1d000 rw-p 00007000 08:01 543205 /usr/lib/libXrandr.so.2.2.0
7ff510f1d000-7ff510f2c000 r-xp 00000000 08:01 565852 /usr/lib/libXi.so.6.1.0
7ff510f2c000-7ff51112b000 ---p 0000f000 08:01 565852 /usr/lib/libXi.so.6.1.0
7ff51112b000-7ff51112c000 rw-p 0000e000 08:01 565852 /usr/lib/libXi.so.6.1.0
7ff51112c000-7ff51112e000 r-xp 00000000 08:01 533723 /usr/lib/libXinerama.so.1.0.0
7ff51112e000-7ff51132d000 ---p 00002000 08:01 533723 /usr/lib/libXinerama.so.1.0.0
7ff51132d000-7ff51132e000 rw-p 00001000 08:01 533723 /usr/lib/libXinerama.so.1.0.0
7ff51132e000-7ff511337000 r-xp 00000000 08:01 546023 /usr/lib/libXrender.so.1.3.0
7ff511337000-7ff511537000 ---p 00009000 08:01 546023 /usr/lib/libXrender.so.1.3.0
7ff511537000-7ff511538000 rw-p 00009000 08:01 546023 /usr/lib/libXrender.so.1.3.0
7ff511538000-7ff51154a000 r-xp 00000000 08:01 543892 /usr/lib/libXext.so.6.4.0
7ff51154a000-7ff511749000 ---p 00012000 08:01 543892 /usr/lib/libXext.so.6.4.0
7ff511749000-7ff51174a000 rw-p 00011000 08:01 543892 /usr/lib/libXext.so.6.4.0
7ff51174a000-7ff511752000 r-xp 00000000 08:01 524547 /usr/lib/libstartup-notification-1.so.0.0.0
7ff511752000-7ff511952000 ---p 00008000 08:01 524547 /usr/lib/libstartup-notification-1.so.0.0.0
7ff511952000-7ff511953000 rw-p 00008000 08:01 524547 /usr/lib/libstartup-notification-1.so.0.0.0
7ff511953000-7ff511a8c000 r-xp 00000000 08:01 543160 /usr/lib/libX11.so.6.3.0
7ff511a8c000-7ff511c8c000 ---p 00139000 08:01 543160 /usr/lib/libX11.so.6.3.0
7ff511c8c000-7ff511c92000 rw-p 00139000 08:01 543160 /usr/lib/libX11.so.6.3.0
7ff511c92000-7ff511ca9000 r-xp 00000000 08:01 532043 /usr/lib/libICE.so.6.3.0
7ff511ca9000-7ff511ea8000 ---p 00017000 08:01 532043 /usr/lib/libICE.so.6.3.0
7ff511ea8000-7ff511ea9000 rw-p 00016000 08:01 532043 /usr/lib/libICE.so.6.3.0
7ff511ea9000-7ff511ead000 rw-p 00000000 00:00 0
7ff511ead000-7ff511eb4000 r-xp 00000000 08:01 533402 /usr/lib/libSM.so.6.0.1
7ff511eb4000-7ff5120b3000 ---p 00007000 08:01 533402 /usr/lib/libSM.so.6.0.1
7ff5120b3000-7ff5120b4000 rw-p 00006000 08:01 533402 /usr/lib/libSM.so.6.0.1
7ff5120b4000-7ff5120bb000 r-xp 00000000 08:01 671663 /lib/librt-2.14.so
7ff5120bb000-7ff5122ba000 ---p 00007000 08:01 671663 /lib/librt-2.14.so
7ff5122ba000-7ff5122bb000 r--p 00006000 08:01 671663 /lib/librt-2.14.so
7ff5122bb000-7ff5122bc000 rw-p 00007000 08:01 671663 /lib/librt-2.14.so
7ff5122bc000-7ff5122c0000 r-xp 00000000 08:01 561317 /usr/lib/libgthread-2.0.so.0.2800.8
7ff5122c0000-7ff5124bf000 ---p 00004000 08:01 561317 /usr/lib/libgthread-2.0.so.0.2800.8
7ff5124bf000-7ff5124c0000 rw-p 00003000 08:01 561317 /usr/lib/libgthread-2.0.so.0.2800.8
7ff5124c0000-7ff5124c3000 r-xp 00000000 08:01 561316 /usr/lib/libgmodule-2.0.so.0.2800.8
7ff5124c3000-7ff5126c2000 ---p 00003000 08:01 561316 /usr/lib/libgmodule-2.0.so.0.2800.8
7ff5126c2000-7ff5126c3000 rw-p 00002000 08:01 561316 /usr/lib/libgmodule-2.0.so.0.2800.8
7ff5126c3000-7ff5127e3000 r-xp 00000000 08:01 561320 /usr/lib/libgio-2.0.so.0.2800.8
7ff5127e3000-7ff5129e2000 ---p 00120000 08:01 561320 /usr/lib/libgio-2.0.so.0.2800.8
7ff5129e2000-7ff5129e8000 rw-p 0011f000 08:01 561320 /usr/lib/libgio-2.0.so.0.2800.8
7ff5129e8000-7ff5129e9000 rw-p 00000000 00:00 0
7ff5129e9000-7ff512a6a000 r-xp 00000000 08:01 661552 /lib/libm-2.14.so
7ff512a6a000-7ff512c69000 ---p 00081000 08:01 661552 /lib/libm-2.14.so
7ff512c69000-7ff512c6a000 r--p 00080000 08:01 661552 /lib/libm-2.14.so
7ff512c6a000-7ff512c6b000 rw-p 00081000 08:01 661552 /lib/libm-2.14.so
7ff512c6b000-7ff512c94000 r-xp 00000000 08:01 525655 /usr/lib/libpng14.so.14.5.0
7ff512c94000-7ff512e93000 ---p 00029000 08:01 525655 /usr/lib/libpng14.so.14.5.0
7ff512e93000-7ff512e94000 rw-p 00028000 08:01 525655 /usr/lib/libpng14.so.14.5.0Aborted

Edit: I have installed the AUR package xfce4-sensors-plugin-git and this does not crash.