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

[Gerd Knorr <kraxel@xxxxxxx>]

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 */

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