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From Marc Slemko <ma...@znep.com>
Subject Re: os-irix/1710: Some image files get corrupted during transfer
Date Wed, 21 Jan 1998 06:30:00 GMT
The following reply was made to PR os-irix/1710; it has been noted by GNATS.

From: Marc Slemko <marcs@znep.com>
To: Jamie Scuglia <jamie@cs.monash.edu.au>
Cc: apbugs@hyperreal.org
Subject: Re: os-irix/1710: Some image files get corrupted during transfer
Date: Tue, 20 Jan 1998 23:25:37 -0700 (MST)

 On 21 Jan 1998, Jamie Scuglia wrote:
 
 > Also check exactly where the differences lie in the files.
 > 
 > # cmp test1.jpg test1.jpg.1
 > # cmp test1.jpg.1 test1.jpg.2
 > ...etc
 > 
 > The differences all seem to occur at the same point.
 
 and they have an ungodly number of nulls in them:
 
       bad  good
  --------  -----
  78017   0 212
  78018   0 224
  78019   0 352
  78020   0  34
  78021   0 175
  78022   0 216
  78023   0 233
  78024 306 177
  78049   0 102
  78050   0 354
  78051   0 374
  78052   0 167
  78053   0  33
  78054   0 257
  78055   0  32
 [...]
 
 Hmm.  Wonder if a simple standalone test program could reproduce this...
 would make it easier to convince SGI.
 
 Ah.  The corruption starts at the beginning of a packet:
 
 23:17:39.677375 shelob.cs.monash.edu.au.http > valis.worldgate.com.1284: .
 68621
 :70081(1460) ack 141 win 61320 (DF)
 Data: 1460 bytes
 Offset  Hex                                              ASCII
 0x0000  0f40 7e2a f857 0fc9 0875 8798 66e4 aa10         |.@~*.W...u...f...|
 0x0010  7ed1 a13f ea8c a284 8f10 3062 5baf 160c         |~..?......0b[...|
 0x0020  9ca5 6d96 4e5b 2ff5 c748 9104 51e9 8468         |..m.N[/..H..Q..h|
 0x0030  c046 2a49 2ed5 dd88 c78b e29e 11ee 4b80         |.F*I..........K.|
 0x0040  23c4 1fc7 1686 eeea 0de3 9181 1d37 c108         |#............7..|
 0x0050  51a4 aca9 eaa0 ad23 0695 f9b0 ca16 f0b4         |Q......#........|
 0x0060  3c99 f833 1341 d853 ecf5 1899 0ea1 147a         |<..3.A.S.......z|
 0x0070  2636 be6d d560 011d 9668 e942 92af 3523         |&6.m.`...h.B..5#|
 
 0f40 7e2a is:
 
  68376  17 271
  68377 100  12
  68378 176  23
  68379  52 112
  68380 370 364
  68381 127  33
  68382  17 234
  68383 311 262
  68384  10  35
 
 (left is corrupted, right is proper).  Yea, sure looks like an IRIX bug.
 Sigh.
 

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