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Re: panic: sbdrop

On 2-Apr-09, at 2:33 PM, Manuel Bouyer wrote:
on this netbsd-5 box (test NFS server with 2 fast linux clients) I got
(after fixing m_split() to handle 0 len, see previous mail):

panic: sbdrop
fatal breakpoint trap in supervisor mode
trap type 1 code 0 eip c03faa4c cs 8 eflags 246 cr2 cdb59000 ilevel 4
Stopped in pid 0.3 (system) at  netbsd:breakpoint+0x4:  popl    %ebp
db{0}> tr
breakpoint (c065149e,cd13bbac,c06adc00,c0361439,6,c3c14500,cd13bba0,c0388770,5043 5051,ffffffff) at netbsd:breakpoint+0x4 panic (c0655801,c3c14500,ffffffff,c035dc93,50435851,c06adc00,0,e8,c3ba07e0,c 3c14400) at netbsd:panic+0x1b0 sbdrop(c3ba07e0,e8,c3c1446c,14,20,0,c3b40d00,14,cd13bca8,ce320030) at netbsd:sbdrop+0x2f8 tcp_input(c3c14400,14,6,1,c01280ea,cbf87a00,0,0,14,cbf87a00) at netbsd:tcp_input+0x24b7 ip_input(c3c14400,0,7,cbf87a00,cd137154,cd1371ec,cd13bd80,c03433ed, 0,cd130010) at netbsd:ip_input+0x61f ipintr (0,cd130010,cbf80030,cbf80010,c2da0010,0,f87c80,c2da3780,0,cd13bda0) a t netbsd:ipintr+0x4d softint_dispatch(cbf87c80,4,0,0,0,0,cd13bd90,cd13ba68,cd13bac0,18) at netbsd:softint_dispatch+0xcd
DDB lost frame for netbsd:Xsoftintr+0x3d, trying 0xcd13bd88
Xsoftintr() at netbsd:Xsoftintr+0x3d

I've had an equivalent panic and traceback that I eventually narrowed down to a duplicate mfree... ie: a UDP packet was encountered in the TCP stack.

Maybe not in this case but maybe it'll help.

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