My FreeBSD RELENG_5_1 server (cvsupped 4 days ago) seems to have problems - it crashes from time to time (approx. once a day).
I've rebuilt the kernel with debug-symbols and enabled the debugger and caught a crash tonight:
Here's what I had on screen (I also ran "show reg" and "trace"):
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x14
fault code = supervisor write, page not present
instruction pointer = 0x8:0xc02e8139
stack pointer = 0x10:0xcfbf684c
frame pointer = 0x10:0xcfbf6880
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 = 46373 (ctl_cyrusdb)
kernel: type 12 trap, code=0
Stopped at g_dev_strategy+0x29: movl %eax,0x14(%ebx)
db> show reg
cs 0x8
ds 0x10
es 0x10
fs 0x18
ss 0x10
eax 0xf7255200
ecx 0
edx 0
ebx 0
esp 0xcfbf684c
ebp 0xcfbf6880
esi 0xc201e824
edi 0xc2044900
eip 0xc02e8139 g_dev_strategy+0x29
efl 0x10286
dr0 0
dr1 0
dr2 0
dr3 0
dr4 0xffff0ff0
dr5 0x400
dr6 0xffff0ff0
dr7 0x400
g_dev_strategy+0x29: movl %eax,0x14(%ebx)
db> trace
g_dev_strategy(c201e824,c2152800,0,cfbf68d0,c2098eca) at g_dev_strategy+0x29
launch_requests(c2e16e80,0,10000,ffffffff,43) at launch_requests+0x448
vinumstart(c5ad9da8,0,c243aab0,cfbf694c,c02e5bc6) at vinumstart+0x2b2
vinumstrategy(c5ad9da8,0,c0b79490,40,0) at vinumstrategy+0xa6
spec_xstrategy(c215b7fc,c5ad9da8,cfbf6968,c02e4f18,cfbf6994) at spec_xstrategy+0x306
spec_specstrategy(cfbf6994,cfbf69b0,c044f7ad,cfbf6994,0) at spec_specstrategy+0x1b
spec_vnoperate(cfbf6994,0,c0b79490,f,c5ad9da8) at spec_vnoperate+0x18
ufs_strategy(cfbf69d8,cfbf6a0c,c0359a87,cfbf69d8,1) at ufs_strategy+0xdd
ufs_vnoperate(cfbf69d8,1,c0504f45,35e,cfbf69f8) at ufs_vnoperate+0x18
bwrite(c5ad9da8,cfbf6a5c,c0361aca,c5ad9da8,c5ad9ed8) at bwrite+0x3a7
bawrite(c5ad9da8,c5ad9ed8,10,3c6,20020080) at bawrite+0x1c
cluster_wbuild(c302c000,4000,4c,0,4) at cluster_wbuild+0x6ba
cluster_write(c5afaf08,84cf9c,0,51,c2f82300) at cluster_write+0x571
ffs_write(cfbf6be0,c1fb97f8,c243aab0,227,c2158600) at ffs_wrie+0x5ff
vn_write(c1fb97f8,cfbf6c7c,c2f82300,0,c243aab0) at vn_write+0x192
write(c243aab0,cfbf6d10,c0518514,3fb,3) at write+0x69
syscall(2f,2f,2f,0,807e000) at syscall+0x24e
Xint0x80_syscall() at Xint0x80_syscall+0x1d
--- syscall (4, FreeBSD ELF32, write), eip = 0x282e08b3, esp = 0xbfbfec1c, ebp = 0xbfbfec38 ---
db>
I _think_ I've managed to type it all in correctly.
No crash dump was made (I have dumpdev="/dev/ad0s1b" in /etc/rc.conf) - are there anything else I need to do to get it to crashdump to that device?
Should I have given any other commands to the internal debugger to find more information?
The kernel I'm running is really GENERIC with a few small changes:
vimes# diff VIMES /usr/src/sys/i386/conf/GENERIC 25c25 < ident trisha ---
ident GENERIC30c30
< makeoptions DEBUG=-g #Build kernel with gdb(1) debug symbols
---
#makeoptions DEBUG=-g #Build kernel with gdb(1) debug
symbols 62c62 < options DDB #Enable the kernel debugger ---
#options DDB #Enable the kernel debugger
266,269d265 < # This option is a subset of the IPFILTER option. < options IPFILTER #ipfilter support < options IPFILTER_LOG #ipfilter logging < options IPFILTER_DEFAULT_BLOCK #block all packets by default vimes#
So, can anyone help me out here? Are there anything else I should have done to find more information? Any other commands to give to the kernel debugger? Any way of making the crashdump happen next time I see a kernel trap like this?
-- Eivind Olsen [EMAIL PROTECTED]
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