Hello. Today one of my boxes paniced with "panic: spin lock held too long." message -- it was online for 6 hours, under rather light load. Unfortunately, I wasn't able to get any more information, as the box got restarted by our staff. Is this, anyway, a known problem (I see two people mentioning it on freebsd-smp in May 2005) and, what's more important, how can it be fixed? The OS is 5.4-RELEASE-p7, the hardware: [...] CPU: Intel Pentium III Xeon (697.68-MHz 686-class CPU) Origin = "GenuineIntel" Id = 0x6a1 Stepping = 1 Features=0x387fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP ,MTRR,PGE,MCA,CMOV,PAT,PSE36,PN,MMX,FXSR,SSE> real memory = 1073676288 (1023 MB) avail memory = 1041125376 (992 MB) ACPI APIC Table: <INTEL SKA4 > FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs cpu0 (BSP): APIC ID: 3 cpu1 (AP): APIC ID: 0 cpu2 (AP): APIC ID: 1 cpu3 (AP): APIC ID: 2 MADT: Forcing active-low polarity and level trigger for SCI [...] SMP: AP CPU #1 Launched! SMP: AP CPU #2 Launched! SMP: AP CPU #3 Launched! [...] Any ideas? -- Krzysztof Kowalik | () ASCII Ribbon Campaign Computer Centre, AGH UST | /\ Support plain text e-mail