Nov 14 00:00:01 workstation /USR/SBIN/CRON[30993]: (root) CMD (/usr/local/sbin/btrfs-make-snapshot minutes /home >> /var/log/snapshot.log) Nov 14 00:00:01 workstation /USR/SBIN/CRON[30994]: (root) CMD (/usr/local/sbin/btrfs-make-snapshot days /home >> /var/log/snapshot.log) Nov 14 00:00:01 workstation /USR/SBIN/CRON[30995]: (root) CMD (/usr/local/sbin/btrfs-remove-snapshots 100 100 /home/ / >> /var/log/snapshot.log) Below is a grep for NMI in my kernel message log. I'm running Debian kernel 3.11.6-2 on a quad-core AMD64 system. Above is the relevant section of the cron log. It appears that running two scripts that create snapshots at the same time as a script that removes maybe 97 snapshots causes an NMI. I've attached the kernel message log from today, I can give you logs from other days if they are useful. Nov 11 00:00:58 workstation kernel: [896466.616001] sending NMI to all CPUs: Nov 11 00:00:58 workstation kernel: [896466.616016] NMI backtrace for cpu 0 Nov 11 00:00:58 workstation kernel: [896466.616001] NMI backtrace for cpu 2 Nov 11 00:00:58 workstation kernel: [896466.616479] NMI backtrace for cpu 3 Nov 11 00:00:58 workstation kernel: [896466.616637] NMI backtrace for cpu 1 Nov 12 00:00:58 workstation kernel: [982863.428000] sending NMI to all CPUs: Nov 12 00:00:58 workstation kernel: [982863.428000] NMI backtrace for cpu 1 Nov 12 00:00:58 workstation kernel: [982863.428340] NMI backtrace for cpu 0 Nov 12 00:00:58 workstation kernel: [982863.428647] NMI backtrace for cpu 2 Nov 12 00:00:58 workstation kernel: [982863.428725] NMI backtrace for cpu 3 Nov 13 00:00:57 workstation kernel: [1069265.036001] sending NMI to all CPUs: Nov 13 00:00:57 workstation kernel: [1069265.036018] NMI backtrace for cpu 1 Nov 13 00:00:57 workstation kernel: [1069265.036341] NMI backtrace for cpu 0 Nov 13 00:00:57 workstation kernel: [1069265.036001] NMI backtrace for cpu 2 Nov 13 00:00:57 workstation kernel: [1069265.036723] NMI backtrace for cpu 3 Nov 13 22:21:04 workstation kernel: [1149672.214144] INFO: NMI handler (perf_event_nmi_handler) took too long to run: 6.060 msecs Nov 14 00:00:56 workstation kernel: [1155663.796001] sending NMI to all CPUs: Nov 14 00:00:56 workstation kernel: [1155663.796001] NMI backtrace for cpu 2 Nov 14 00:00:56 workstation kernel: [1155663.796269] NMI backtrace for cpu 3 Nov 14 00:00:56 workstation kernel: [1155663.796007] NMI backtrace for cpu 1 Nov 14 00:00:56 workstation kernel: [1155663.796581] NMI backtrace for cpu 0 -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/
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