I had a similar panic today that ocurred shortly after reaching the mclpools limit.
WARNING: mclpools limit reached; increase kern.maxclusters em0: em_get_buf: slot 6 already has an mbuf panic: em_rxeof: NULL mbuf in slot 7 (nrx 12, filled 128) Starting stack trace... panic() at panic+0x10b em_rxeof() at em_rxeof+0x428 em_intr() at em_intr+0x15b intr_handler() at intr_handler+0x40 end of kernel end trace frame: 0x1000, count: 253 End of stack trace. syncing disks... em0: watchdog timeout -- resetting em0: watchdog timeout -- resetting em0: watchdog timeout -- resetting em0: watchdog timeout -- resetting em0: watchdog timeout -- resetting WARNING: mclpools limit reached; increase kern.maxclusters panic: em_rxeof: NULL mbuf in slot 26 (nrx 11, filled 38) Starting stack trace... panic() at panic+0x10b em_rxeof() at em_rxeof+0x428 em_intr() at em_intr+0x15b intr_handler() at intr_handler+0x40 Xintr_ioapic_level5() at Xintr_ioapic_level5+0xe0 --- interrupt --- Bad frame pointer: 0xffff800032cc0ad0 end trace frame: 0xffff800032cc0ad0, count: 252 Xspllower+0xe: End of stack trace.
