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Diff for /www/ddb.html between version 1.17 and 1.18

version 1.17, 2017/02/06 17:24:32 version 1.18, 2017/02/06 18:55:43
Line 126 
Line 126 
   
 <blockquote><pre>  <blockquote><pre>
 kernel: page fault trap, code=0  kernel: page fault trap, code=0
 Stopped at    <b>_pf_route+0x263</b>:        mov     0x40(%edi),%edx  Stopped at    <b>pf_route+0x263</b>:        mov     0x40(%edi),%edx
 ddb>  ddb>
 </pre></blockquote>  </pre></blockquote>
   
 This crash happened at offset <tt>0x263</tt> in the function <tt>_pf_route</tt>.  This crash happened at offset <tt>0x263</tt> in the function <tt>pf_route</tt>.
   
 <p>  <p>
 The first command to run from the  The first command to run from the
Line 138 
Line 138 
   
 <blockquote><pre>  <blockquote><pre>
 ddb> <b>trace</b>  ddb> <b>trace</b>
 <b>_pf_route</b>(e28cb7e4,e28bc978,2,1fad,d0b8b120) at <b>_pf_route+0x263</b>  <b>pf_route</b>(e28cb7e4,e28bc978,2,1fad,d0b8b120) at <b>pf_route+0x263</b>
 _pf_test(2,1f4ad,e28cb7e4,b4c1) at _pf_test+0x706  pf_test(2,1f4ad,e28cb7e4,b4c1) at pf_test+0x706
 _pf_route(e28cbb00,e28bc978,2,d0a65440,d0b8b120) at _pf_route+0x207  pf_route(e28cbb00,e28bc978,2,d0a65440,d0b8b120) at pf_route+0x207
 _pf_test(2,d0a65440,e28cbb00,d023c282) at _pf_test+0x706  pf_test(2,d0a65440,e28cbb00,d023c282) at pf_test+0x706
 _ip_output(d0b6a200,0,0,0,0) at _ip_output+0xb67  ip_output(d0b6a200,0,0,0,0) at ip_output+0xb67
 _icmp_send(d0b6a200,0,1,a012) at _icmp_send+0x57  icmp_send(d0b6a200,0,1,a012) at icmp_send+0x57
 _icmp_reflect(d0b6a200,0,1,0,3) at _icmp_reflect+0x26b  icmp_reflect(d0b6a200,0,1,0,3) at icmp_reflect+0x26b
 _icmp_input(d0b6a200,14,0,0,d0b6a200) at _icmp_input+0x42c  icmp_input(d0b6a200,14,0,0,d0b6a200) at icmp_input+0x42c
 _ipv4_input(d0b6a200,e289f140,d0a489e0,e289f140) at _ipv4_input+0x6eb  ipv4_input(d0b6a200,e289f140,d0a489e0,e289f140) at ipv4_input+0x6eb
 _ipintr(10,10,e289f140,e289f140,e28cbd38) at _ipintr+0x8d  ipintr(10,10,e289f140,e289f140,e28cbd38) at ipintr+0x8d
 Bad frame pointer: 0xe28cbcac  Bad frame pointer: 0xe28cbcac
 ddb>  ddb>
 </pre></blockquote>  </pre></blockquote>
Line 172 
Line 172 
 In the output, grep for the function name:  In the output, grep for the function name:
   
 <blockquote><pre>  <blockquote><pre>
 $ <b>grep "&lt;_pf_route&gt;:" /tmp/pf.dis</b>  $ <b>grep "&lt;pf_route&gt;:" /tmp/pf.dis</b>
 0000<b>7d88</b> &lt;_pf_route&gt;:  0000<b>7d88</b> &lt;pf_route&gt;:
 </pre></blockquote>  </pre></blockquote>
   
 Take this first hex number <tt>7d88</tt> and add the offset <tt>0x263</tt> from  Take this first hex number <tt>7d88</tt> and add the offset <tt>0x263</tt> from
Line 184 
Line 184 
 7feb  7feb
 </pre></blockquote>  </pre></blockquote>
   
 Scroll down to that line (the assembler instruction should match the one  Scroll down to the line <tt>7feb</tt>.
 quoted in the <tt>Stopped at</tt> line), then up to the nearest C line number:  The assembler instruction should match the one quoted in the <tt>Stopped at</tt>
   line.
   Then scroll up to the nearest C line number:
   
 <blockquote><pre>  <blockquote><pre>
 $ <b>more /tmp/pf.dis</b>  $ <b>more /tmp/pf.dis</b>
 /sys/net/pf.c:<b>3872</b>  /sys/net/pf.c:<b>3872</b>
     7fe7:       0f b7 43 02             movzwl 0x2(%ebx),%eax      7fe7:       0f b7 43 02             movzwl 0x2(%ebx),%eax
     <b>7feb</b>:       8b 57 40                mov    0x40(%edi),%edx      <b>7feb</b>:       8b 57 40                <b>mov    0x40(%edi),%edx</b>
     7fee:       39 d0                   cmp    %edx,%eax      7fee:       39 d0                   cmp    %edx,%eax
     7ff0:       0f 87 92 00 00 00       ja     8088 &lt;_pf_route+0x300&gt;      7ff0:       0f 87 92 00 00 00       ja     8088 &lt;pf_route+0x300&gt;
 </pre></blockquote>  </pre></blockquote>
   
 So, it's precisely line <tt>3872</tt> of <tt>pf.c</tt> that crashes:  So, it's precisely line <tt>3872</tt> of <tt>pf.c</tt> that crashes:
Legend:
Removed from v.1.17  
changed lines
  Added in v.1.18