PAE broken on 7-STABLE

Arnaud Lacombe lacombar at
Mon Dec 5 22:41:14 UTC 2011


A FreeBSD 7-STABLE miserably crashes on the following:

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address = 0xbfef0000
fault code            = supervisor read, page not present
instruction pointer   = 0x20:0xc05fd1c2
stack pointer         = 0x28:0xc0af6c7c
frame pointer         = 0x28:0xc0af6cc0
code segment          = base 0x0, limit 0xfffff, type 0x1b
                      = DPL 0, pres 1, def32 1, gran 1
processor eflags      = interrupt enabled, resume, IOPL = 0
current process       = 0 ()
trap number           = 12
panic: page fault
cpuid = 0
KDB: stack
db_trace_self_wrapper(c0662728,0,c062b78b,c0af6b28,0,...) at
db_trace_self_wrapper+0x26panic(c062b78b,c06639cc,c06c1de4,1,1,...) at
panic+0x106trap_fatal(c0c74388,c065b897,c064d922,10,c0c74000,...) at
trap_pfault(c06d4e40,c0c74380,c0af6c40,3,c06c1bc0,...) at trap_pfault+0x2aa
trap(c0af6c3c) at trap+0x36ecalltrap() at calltrap+0x6
--- trap 0xc, eip = 0xc05fd1c2, esp = 0xc0af6c7c, ebp = 0xc0af6cc0 ---
pmap_map(c0af6d68,3f6ba000,6,3fef8000,6,...) at pmap_map+0x72
vm_page_startup(c0d3e000,a,c0af6d88,c03f8f26,0,...) at vm_page_startup+0x35a
vm_mem_init(0,af0000,af0020,af0000,0,...) at vm_mem_init+0x18
mi_startup() at mi_startup+0x56begin() at begin+0x2c

on a machine with 24GB of RAM, while PAE is meant to support up to 64GB.

 - Arnaud

ps: this is just a report, I'm not really expecting anything, any
longer, from the FreebSD "community".

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