WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

Re: [Xen-devel] bug: slab corruption (net backend?)

Gerd Knorr <kraxel@xxxxxxx> writes:

> The tcpdump was taken on eskarina (not the xen host), so the
> packets really go out to the wire ...

more detailed tcpdump of another connection stall:

16:32:44.311412 IP master-xen.ssh > eskarina.49606: P 2256:2304(48) ack 2335 
win 2728 <nop,nop,timestamp 4294945237 2086500670>
        0x0000:  4510 0064 71b9 4000 4006 3798 952c b36c  E..dq.@.@.7..,.l
        0x0010:  952c b36d 0016 c1c6 8b94 e24a 5c6d 220a  .,.m.......J\m".
        0x0020:  8018 0aa8 7028 0000 0101 080a ffff a9d5  ....p(..........
        0x0030:  7c5d 793e 8889 411e e090 5982 d79e fc6b  |]y>..A...Y....k
        0x0040:  d9c6 3535 b109 5a9b e38f 3a3a e695 29af  ..55..Z...::..).
        0x0050:  81db 9dc7 a1a5 56c1 5586 1f3d ab76 1fde  ......V.U..=.v..
        0x0060:  46d5 5d6f                                F.]o
16:32:44.311416 IP eskarina.49606 > master-xen.ssh: . ack 2304 win 2420 
<nop,nop,timestamp 2086500691 4294945237>
        0x0000:  4510 0034 68ba 4000 4006 40c7 952c b36d  E..4h.@.@.@..,.m
        0x0010:  952c b36c c1c6 0016 5c6d 220a 8b94 e27a  .,.l....\m"....z
        0x0020:  8010 0974 8e2c 0000 0101 080a 7c5d 7953  ...t.,......|]yS
        0x0030:  ffff a9d5                                ....
16:32:44.311568 IP master-xen.ssh > eskarina.49606: P 2304:2384(80) ack 2335 
win 2728 <nop,nop,timestamp 4294945237 2086500670>
        0x0000:  4510 0084 71bb 4000 4006 3776 952c b36c  E...q.@.@.7v.,.l
        0x0010:  952c b36d 0016 c1c6 8b94 e27a 5c6d 220a  .,.m.......z\m".
        0x0020:  8018 0aa8 0ee4 0000 0101 080a ffff a9d5  ................
        0x0030:  7c5d 793e b9cb e472 6e18 cf4c f551 af4d  |]y>...rn..L.Q.M
        0x0040:  0131 a5c8 178e 610f 08ce 253b 084f b7cc  .1....a...%;.O..
        0x0050:  d7bb a84a 4865 322d 3634 ce9c 5026 2ad6  ...JHe2-64..P&*.
        0x0060:  b41b 830b 0000 0000 0000 0000 0000 0000  ................
        0x0070:  0000 0000 0000 0000 0000 0000 0000 0000  ................
        0x0080:  0000 0000                                ....
16:32:44.311866 IP master-xen.ssh > eskarina.49606: P 2384:2448(64) ack 2335 
win 2728 <nop,nop,timestamp 4294945237 2086500670>
        0x0000:  4510 0074 71bd 4000 4006 3784 952c b36c  E..tq.@.@.7..,.l
        0x0010:  952c b36d 0016 c1c6 8b94 e2ca 5c6d 220a  .,.m........\m".
        0x0020:  8018 0aa8 045e 0000 0101 080a ffff a9d5  .....^..........
        0x0030:  7c5d 793e 2134 146a 6adb 9a0e abc3 fc9d  |]y>!4.jj.......
        0x0040:  1350 7f6f eac9 b4d4 5059 6cf4 dcdd 085f  .P.o....PYl...._
        0x0050:  a943 68d7 9f60 b799 ddbf 0eee 6a8c 850d  .Ch..`......j...
        0x0060:  4294 4541 19c3 eddf 7fe5 afe5 6573 5c8f  B.EA........es\.
        0x0070:  62f2 a6ae                                b...
16:32:44.311875 IP eskarina.49606 > master-xen.ssh: . ack 2304 win 2420 
<nop,nop,timestamp 2086500692 4294945237,nop,nop,sack sack 1 {2384:2448} >
        0x0000:  4510 0040 68bc 4000 4006 40b9 952c b36d  E..@h.@.@.@..,.m
        0x0010:  952c b36c c1c6 0016 5c6d 220a 8b94 e27a  .,.l....\m"....z
        0x0020:  b010 0974 7b15 0000 0101 080a 7c5d 7954  ...t{.......|]yT
        0x0030:  ffff a9d5 0101 050a 8b94 e2ca 8b94 e30a  ................

The 2304:2384 payload package is broken and causes the stalls: End of
package is filled with zeros.  master-xen tried to resend the broken
package over and over again, but that doesn't work of course ...

  Gerd

-- 
panic("it works"); /* avoid being flooded with debug messages */

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel