830b3 Lockup?

[jlpellet]

Since testing 8.3.0 Beta 3 64, one of my FreeNAS systems has been intermittently locking up. Since it is normally headless, it took until today to get it on the test bench where I could attach a monitor. Here is the error message, if I did not make any typos. This is on an Intel P7H55 MB, i3-530 CPU, 8GB RAM, 6x1.5TB AHCI HD in ZFS z1 pool.

vm_page_free: pindex(64), busy (11), VPO_BUSY(0), hold(0)
panic: vm_page_free: freeing busy page
cpuid=2
KDB: enter: panic
[thread pid 2784 tid 100325]
Stopped at kdb_enter+0x3b: movq $0, )x74ce42(%rip) db>

My 1st step was to slow DRAM in BIOS. Ideas welcome.

Thanks!

 

[jlpellet]

Tried RC1 overnight & again locked up with different message:

Fatal trap 12: page fault while in kernal mode
cpuid = 0; apic id = 0
fault virtual address = 0xffffff800841f731
fault code = supervisor read data, page not present
instruction pointer = 0x20:0xffffffff808afaf6
stack pointer = 0x28:0xffffff8070bf45e0
frame pointer = 0x28:0xffffff8070bf4630
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, long 1, def32 0, gen1
processor eflags = interrupt enabled, resume, IOPL=0
current process 9446
[thread pid 9446 tid 100299 ]
Stopped at bcopy+0x16: repe movsq (%rsi),%es:(%rdi)
db>

Any suggestions welcome.

Thanks

 

[jlpellet]

Looks like problem was bad RAM, even though the system had been in service for more than 2 years. Replaced pair of sticks & no recurrence yet.