I have one that rebooted this morning and is spinning attaching gdb shows very little due to lack of symbol tables: (gdb) where #0 0x00007f671aab3ff3 in select () from /lib/libc.so.6 strace shows a loop: Process 971 attached - interrupt to quit select(16, [7 10 13 14 15], [], [], {0, 995193}) = 1 (in [14], left {0, 970413}) read(14, "\16\0\0\0\0\0\0\0\376\377\377\377\0\0\0\0\0\0\0\0\0\0\0\0\5\0\0\0\0\0\0\0"..., 128) = 128 rt_sigaction(SIGALRM, NULL, {0x4a9900, ~[KILL STOP RTMIN RT_1], SA_RESTORER, 0x7f671d28c8f0}, 8) = 0 write(8, "\1\0\0\0\0\0\0\0", 8) = 8 read(14, 0x7fff53785d20, 128) = -1 EAGAIN (Resource temporarily unavailable) timer_gettime(0x5, {it_interval={0, 0}, it_value={0, 0}}) = 0 timer_settime(0x5, 0, {it_interval={0, 0}, it_value={0, 250000}}, NULL) = 0 timer_gettime(0x5, {it_interval={0, 0}, it_value={0, 185840}}) = 0 select(16, [7 10 13 14 15], [], [], {1, 0}) = 1 (in [7], left {0, 999997}) read(7, "\1\0\0\0\0\0\0\0", 512) = 8 select(16, [7 10 13 14 15], [], [], {1, 0}) = 1 (in [14], left {0, 999997}) read(14, "\16\0\0\0\0\0\0\0\376\377\377\377\0\0\0\0\0\0\0\0\0\0\0\0\5\0\0\0\0\0\0\0"..., 128) = 128 rt_sigaction(SIGALRM, NULL, {0x4a9900, ~[KILL STOP RTMIN RT_1], SA_RESTORER, 0x7f671d28c8f0}, 8) = 0 write(8, "\1\0\0\0\0\0\0\0", 8) = 8 read(14, 0x7fff53785d20, 128) = -1 EAGAIN (Resource temporarily unavailable) timer_gettime(0x5, {it_interval={0, 0}, it_value={0, 0}}) = 0 timer_settime(0x5, 0, {it_interval={0, 0}, it_value={0, 28902469}}, NULL) = 0 (repeats) $ sudo lsof -p 971 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME kvm 971 libvirt-qemu cwd DIR 259,0 4096 128 / kvm 971 libvirt-qemu rtd DIR 259,0 4096 128 / kvm 971 libvirt-qemu txt REG 259,0 3217592 16817685 /usr/bin/qemu-system-x86_64 kvm 971 libvirt-qemu mem REG 259,0 18520 33597583 /usr/lib/sasl2/libplain.so.2.0.23 kvm 971 libvirt-qemu mem REG 259,0 34904 33597580 /usr/lib/sasl2/libntlm.so.2.0.23 kvm 971 libvirt-qemu mem REG 259,0 43296 33595849 /lib/libcrypt-2.11.1.so kvm 971 libvirt-qemu mem REG 259,0 18520 33597534 /usr/lib/sasl2/liblogin.so.2.0.23 kvm 971 libvirt-qemu mem REG 259,0 1622304 33596048 /lib/libcrypto.so.0.9.8 kvm 971 libvirt-qemu mem REG 259,0 51752 33597531 /usr/lib/sasl2/libdigestmd5.so.2.0.23 kvm 971 libvirt-qemu mem REG 259,0 22624 33597528 /usr/lib/sasl2/libcrammd5.so.2.0.23 kvm 971 libvirt-qemu mem REG 259,0 18528 33597524 /usr/lib/sasl2/libanonymous.so.2.0.23 kvm 971 libvirt-qemu mem REG 259,0 1494424 187 /usr/lib/libdb-4.8.so kvm 971 libvirt-qemu mem REG 259,0 22464 33597518 /usr/lib/sasl2/libsasldb.so.2.0.23 kvm 971 libvirt-qemu mem REG 259,0 26840 8762051 /usr/lib/libogg.so.0.6.0 kvm 971 libvirt-qemu mem REG 259,0 182584 56392 /usr/lib/libvorbis.so.0.4.3 kvm 971 libvirt-qemu mem REG 259,0 1943600 8762070 /usr/lib/libvorbisenc.so.2.0.6 kvm 971 libvirt-qemu mem REG 259,0 306744 8762063 /usr/lib/libFLAC.so.8.2.0 kvm 971 libvirt-qemu mem REG 259,0 97256 33595855 /lib/libnsl-2.11.1.so kvm 971 libvirt-qemu mem REG 259,0 22560 530121 /usr/lib/libXdmcp.so.6.0.0 kvm 971 libvirt-qemu mem REG 259,0 14488 530127 /usr/lib/libXau.so.6.0.0 kvm 971 libvirt-qemu mem REG 259,0 256768 33607491 /lib/libdbus-1.so.3.4.0 kvm 971 libvirt-qemu mem REG 259,0 397304 9012660 /usr/lib/libsndfile.so.1.0.21 kvm 971 libvirt-qemu mem REG 259,0 40720 34176892 /lib/libwrap.so.0.7.6 kvm 971 libvirt-qemu mem REG 259,0 63864 467747 /usr/lib/libXi.so.6.1.0 kvm 971 libvirt-qemu mem REG 259,0 73600 533951 /usr/lib/libXext.so.6.4.0 kvm 971 libvirt-qemu mem REG 259,0 14344 33597467 /lib/libgpg-error.so.0.4.0 kvm 971 libvirt-qemu mem REG 259,0 10224 33597288 /lib/libkeyutils-1.2.so kvm 971 libvirt-qemu mem REG 259,0 31168 1063 /usr/lib/libkrb5support.so.0.1 kvm 971 libvirt-qemu mem REG 259,0 14584 33595836 /lib/libcom_err.so.2.1 kvm 971 libvirt-qemu mem REG 259,0 154048 1076 /usr/lib/libk5crypto.so.3.1 kvm 971 libvirt-qemu mem REG 259,0 803192 1073 /usr/lib/libkrb5.so.3.3 kvm 971 libvirt-qemu mem REG 259,0 113072 530136 /usr/lib/libxcb.so.1.1.0 kvm 971 libvirt-qemu mem REG 259,0 98000 450987 /usr/lib/libdirect-1.2.so.0.8.0 kvm 971 libvirt-qemu mem REG 259,0 39448 450989 /usr/lib/libfusion-1.2.so.0.8.0 kvm 971 libvirt-qemu mem REG 259,0 533800 450988 /usr/lib/libdirectfb-1.2.so.0.8.0 kvm 971 libvirt-qemu mem REG 259,0 67896 108782 /usr/lib/libtasn1.so.3.1.7 kvm 971 libvirt-qemu mem REG 259,0 93000 33600106 /lib/libresolv-2.11.1.so kvm 971 libvirt-qemu mem REG 259,0 311376 8762080 /usr/lib/libpulsecommon-0.9.21.so kvm 971 libvirt-qemu mem REG 259,0 27136 8762078 /usr/lib/libXtst.so.6.1.0 kvm 971 libvirt-qemu mem REG 259,0 35032 8714042 /usr/lib/libSM.so.6.0.1 kvm 971 libvirt-qemu mem REG 259,0 97904 8714040 /usr/lib/libICE.so.6.3.0 kvm 971 libvirt-qemu mem REG 259,0 14696 33595850 /lib/libdl-2.11.1.so kvm 971 libvirt-qemu mem REG 259,0 491000 33597343 /lib/libgcrypt.so.11.5.2 kvm 971 libvirt-qemu mem REG 259,0 213784 840 /usr/lib/libgssapi_krb5.so.2.2 kvm 971 libvirt-qemu mem REG 259,0 302464 509194 /usr/lib/libldap_r-2.4.so.2.5.4 kvm 971 libvirt-qemu mem REG 259,0 55568 739 /usr/lib/liblber-2.4.so.2.5.4 kvm 971 libvirt-qemu mem REG 259,0 207376 100083 /usr/lib/libidn.so.11.5.44 kvm 971 libvirt-qemu mem REG 259,0 1572232 33595847 /lib/libc-2.11.1.so kvm 971 libvirt-qemu mem REG 259,0 92752 33673206 /lib/libz.so.1.2.3.3 kvm 971 libvirt-qemu mem REG 259,0 534832 33595851 /lib/libm-2.11.1.so kvm 971 libvirt-qemu mem REG 259,0 6128 41025674 /lib/libaio.so.1.0.1 kvm 971 libvirt-qemu mem REG 259,0 1269216 533945 /usr/lib/libX11.so.6.3.0 kvm 971 libvirt-qemu mem REG 259,0 438624 8762085 /usr/lib/libSDL-1.2.so.0.11.3 kvm 971 libvirt-qemu mem REG 259,0 663816 95502 /usr/lib/libgnutls.so.26.14.12 kvm 971 libvirt-qemu mem REG 259,0 105232 108759 /usr/lib/libsasl2.so.2.0.23 kvm 971 libvirt-qemu mem REG 259,0 146032 550322 /usr/lib/libjpeg.so.62.0.0 kvm 971 libvirt-qemu mem REG 259,0 158736 40991633 /lib/libpng12.so.0.42.0 kvm 971 libvirt-qemu mem REG 259,0 19008 33673202 /lib/libuuid.so.1.3.0 kvm 971 libvirt-qemu mem REG 259,0 14704 8762077 /usr/lib/libpulse-simple.so.0.0.3 kvm 971 libvirt-qemu mem REG 259,0 270968 8762072 /usr/lib/libpulse.so.0.12.2 kvm 971 libvirt-qemu mem REG 259,0 920968 351343 /usr/lib/libasound.so.2.0.0 kvm 971 libvirt-qemu mem REG 259,0 274360 33596045 /lib/libncurses.so.5.7 kvm 971 libvirt-qemu mem REG 259,0 274368 509198 /usr/lib/libcurl-gnutls.so.4.1.1 kvm 971 libvirt-qemu mem REG 259,0 10648 33600110 /lib/libutil-2.11.1.so kvm 971 libvirt-qemu mem REG 259,0 135745 33600105 /lib/libpthread-2.11.1.so kvm 971 libvirt-qemu mem REG 259,0 31744 33600107 /lib/librt-2.11.1.so kvm 971 libvirt-qemu mem REG 259,0 136936 33595830 /lib/ld-2.11.1.so kvm 971 libvirt-qemu mem REG 259,0 217016 17536647 /var/cache/nscd/group kvm 971 libvirt-qemu mem REG 0,9 6562 anon_inode:kvm-vcpu (stat: No such file or directory) kvm 971 libvirt-qemu 0u CHR 1,3 0t0 6571 /dev/null kvm 971 libvirt-qemu 1w REG 259,0 0 16921223 /var/log/libvirt/qemu/strontium.log kvm 971 libvirt-qemu 2w REG 259,0 0 16921223 /var/log/libvirt/qemu/strontium.log kvm 971 libvirt-qemu 3u unix 0xffff88150eab3740 0t0 9821904 /var/lib/libvirt/qemu/strontium.monitor kvm 971 libvirt-qemu 4u CHR 5,2 0t0 6696 /dev/ptmx kvm 971 libvirt-qemu 5u CHR 10,232 0t0 11577 /dev/kvm kvm 971 libvirt-qemu 6u 0000 0,9 0 6562 anon_inode kvm 971 libvirt-qemu 7u 0000 0,9 0 6562 anon_inode kvm 971 libvirt-qemu 8u 0000 0,9 0 6562 anon_inode kvm 971 libvirt-qemu 9u BLK 251,10 0x2c6800000 21453 /dev/mapper/vg0-strontium kvm 971 libvirt-qemu 10u 0000 0,9 0 6562 anon_inode kvm 971 libvirt-qemu 11u 0000 0,9 0 6562 anon_inode kvm 971 libvirt-qemu 12u 0000 0,9 0 6562 anon_inode kvm 971 libvirt-qemu 13u IPv4 9820258 0t0 TCP *:5905 (LISTEN) kvm 971 libvirt-qemu 14u 0000 0,9 0 6562 anon_inode kvm 971 libvirt-qemu 15u unix 0xffff88060ec25b00 0t0 9820259 /var/lib/libvirt/qemu/strontium.monitor kvm 971 libvirt-qemu 21u CHR 10,200 0t0 7280 /dev/net/tun kvm 971 libvirt-qemu 22u CHR 10,200 0t0 7280 /dev/net/tun