Re: SCHEDULE and high load situations

Hi,

With the lastest ULE changes, the stress test doesn't run 30 seconds
till FreeBSD crashes. Since the machine is spare, I'm still connected
to it. I can give you access if you like. Note that this is a new panic
message.

Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address   = 0x14
fault code              = supervisor write, page not present
instruction pointer     = 0x8:0xc066a1c7
stack pointer           = 0x10:0xe2626aa8
frame pointer           = 0x10:0xe2626ab8
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         = 27897 (mimedefang)

Mimedefang is threaded and uses currently libpthreads (kse).

x/x 0xc066a1c7
unp_connect2+0x2a:      f144b89

db> where
unp_connect2(c4bb78a4,c39cc13c,0,0,0) at unp_connect2+0x2a
unp_connect(c4bb78a4,c43d9380,c4dee9a0,c43d9380,80) at unp_connect+0x3d5
uipc_connect(c4bb78a4,c43d9380,c4dee9a0) at uipc_connect+0x76
soconnect(c4bb78a4,c43d9380,c4dee9a0,0,bf1dad88) at soconnect+0x54
kern_connect(c4dee9a0,3,c43d9380,c43d9380,c3e958ac) at kern_connect+0xb0
connect(c4dee9a0,e2626d14,c,c4dee9a0,e2626d3c) at connect+0x42
syscall(2f,2f,2f,bf1dad88,bf1dad8a) at syscall+0x300
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (98, FreeBSD ELF32, connect), eip = 0x28101d23, esp = 0xbf1dad74, ebp = 0xbf1dae10 ---

db> show registers
cs                 0x8
ds                0x10
es                0x10
fs                0x18
ss                0x10
eax                0x2
ecx         0xc3a79ec4
edx               0x29
ebx                  0
esp         0xe2626aa8
ebp         0xe2626ab8
esi         0xc39cc13c
edi         0xc4bb78a4
eip         0xc066a1c7  unp_connect2+0x2a
efl            0x10246
dr0                  0
dr1                  0
dr2                  0
dr3                  0
dr4         0xffff0ff0
dr5              0x400
dr6         0xffff0ff0
dr7              0x400
unp_connect2+0x2a:      movl    %ecx,0x14(%ebx)

Martin