Re: network panic

[Patrick Welche <prlw1%newn.cam.ac.uk@localhost>]

On Wed, Mar 05, 2008 at 01:27:06PM +0000, Patrick Welche wrote:
> Came in to find a Mar 3 11:19 GMT source 4.99.55/i386 kernel stuck in dhcpd
> with:
> 
> uvm_fault(0xce082a00, 0, 1) -> 0xe
> kernel: supervisor trap page fault, code=0
> Stopped in pid 9657.1 (dhcpd) at        0xc03a2b8a:     movl    
> 0x14(%eax),%eax

I just had a variant:

uvm_fault(0xc06138a0, 0, 1) -> 0xe
~Stopped in pid 0.5 (system) at  netbsd:breakpoint+0x4:  popl    %ebp
db{0}> bt
breakpoint(344,39,cc87bfec,c01eb617,0) at netbsd:breakpoint+0x4
cpu_Debugger(0,3f8,5,c0335e80,c05f954c) at netbsd:cpu_Debugger+0xb
comintr(c2d80600,cc8629ac,0,0,0) at netbsd:comintr+0x182
DDB lost frame for netbsd:Xintr_ioapic_edge4+0xa9, trying 0xcc87bff4
Xintr_ioapic_edge4() at netbsd:Xintr_ioapic_edge4+0xa9
--- interrupt ---
--- switch to interrupt stack ---
x86_pause(c0615624,7,0,0,7) at netbsd:x86_pause+0x2
selnotify(c05fbca8,0,1000000,cc862b20,c031d7bc) at netbsd:selnotify+0x12
logwakeup(5,5,0,0,cc862af8) at netbsd:logwakeup+0x40
printf(c050bdd0,c06138a0,0,1,e) at netbsd:printf+0x6f
trap() at netbsd:trap+0x98c
--- trap (number 6) ---
seldestroy(c30e90a0,c30e9018,0,ffffffff,7fffffff) at netbsd:seldestroy+0x6e
sofree(c30e9018,1,cc862c50,c29b5360,c30e9018) at netbsd:sofree+0xfb
in_pcbdetach(c29b5360,c306dbc4,0,c0135aa4,3) at netbsd:in_pcbdetach+0x44
tcp_close(c306dbc4,66666667,c2d9c000,1,c306dbc4) at netbsd:tcp_close+0x379
tcp_timer_2msl(c306dbc4,cc086780,0,c2c4f500,c0100d2e) at netbsd:tcp_timer_2msl+0
xdb
callout_softclock(0,cdb635c0,cc862d80,0,cc862da0) at netbsd:callout_softclock+0x
45e
softint_execute(cc7d8074,cc086780,1,10,cc080010) at netbsd:softint_execute+0x8b
softint_dispatch(ce43a5e0,1,0,0,0) at netbsd:softint_dispatch+0x92
db{0}> show reg
ds          0x10
es          0x10
fs          0x30
gs          0x10
edi         0x7
esi         0x5
ebp         0xcc87bf7c
ebx         0
edx         0xc05f8c00  cn_magic
ecx         0x707
eax         0x1
eip         0xc03d88cc  breakpoint+0x4
cs          0x8
eflags      0x200286
esp         0xcc87bf7c
ss          0x10
netbsd:breakpoint+0x4:  popl    %ebp
db{0}> mach cpu 1
using CPU 1
db{0}> bt
?(800,80000000,800010,29937d1e,77155ca4) at 0x80858c0


so not dhcpd per-se, and not the same end of networking. Hard to spot
the similarity...

Cheers,

Patrick