[Info-vax] Interesting NFS bug...

[JF Mezei]

Redid another test.

While the first one had tagged on contents of an email, this time
around, it provided totally different content at the end of the file.

This would indicate to me that it is not reading "beyond the end of
file", but rather not zeroing a 512 byte buffer before writing fewer
than 512 bytes to it and then sending the full 512 bytes to the client.



> 000011a0  74 22 20 20 73 72 63 3d  22 2f 76 6d 73 2f 70 6f  |t"  src="/vms/po|
> 000011b0  77 65 72 65 64 62 79 32  2e 67 69 66 22 20 61 6c  |weredby2.gif" al|
> 000011c0  74 3d 22 50 6f 77 65 72  65 64 20 62 79 20 56 4d  |t="Powered by VM|
> 000011d0  53 22 3e 0a 3c 2f 74 64  3e 0a 3c 2f 74 72 3e 0a  |S">.</td>.</tr>.|
> 000011e0  0a 0a 3c 74 72 3e 3c 74  64 3e 3c 70 3e 3c 2f 74  |..<tr><td><p></t|
> 000011f0  64 3e 3c 2f 74 72 3e 0a  0a 3c 2f 74 61 62 6c 65  |d></tr>..</table|
> 00001200  3e 0a 0a 3c 2f 62 6f 64  79 3e 0a 3c 2f 68 74 6d  |>..</body>.</htm|
> 00001210  6c 3e 0a 6d 4d 69 4d 6e  6d 69 6e 6d 6d 6e 6d 6d  |l>.mMiMnminmmnmm|
> 00001220  6d 69 6d 6d 6d 6d 6d 6d  6d 6e 6d 6d 6d 6d 6e 69  |mimmmmmmmnmmmmni|
> 00001230  6d 6d 49 69 4d 8d 6d 91  91 91 8d 6c 6d 6c 6c 6d  |mmIiM.m....lmllm|
> 00001240  71 6d 6c 6d 6d 6c 4d 4c  68 6d 91 91 8d 4c 70 71  |qmlmmlMLhm...Lpq|
> 00001250  6d 6d 49 4d 69 49 4d 69  6d 69 6d 4d 69 6d 69 4d  |mmIMiIMimimMimiM|
> 00001260  6d 6d 6d 6a 6d 6d 69 6d  6d 6d 69 6d 6d 69 6d 4d  |mmmjmmimmmimmimM|
> 00001270  6e 6d 6d 6d 6e 69 6d 69  6d 6d 6e 6d 6d 6d 6d 6d  |nmmmnimimmnmmmmm|
> 00001280  6e 6d 69 6d 69 49 6d 8d  8d 71 6c 91 91 91 6d 6d  |nmimiIm..ql...mm|
> 00001290  6c 6c 71 6d 6d 4c 6c 6d  6d 6d 6c 6d 6d 6d 4c 6d  |llqmmLlmmmlmmmLm|
> 000012a0  6c 49 49 6d 49 6d 69 6d  6d 49 6d 6d 6e 6d 6d 6e  |lIImImimmImmnmmn|
> 000012b0  69 4d 69 6d 6d 4d 69 4d  69 6d 4d 69 4d 6d 69 6d  |iMimmMiMimMiMmim|
> 000012c0  6d 69 4d 69 6d 6d 6d 6e  6d 6d 6d 6d 6e 6d 69 6d  |miMimmmnmmmmnmim|
> 000012d0  69 6d 6d 49 6d 6d 49 69  71 91 8d 8d 91 91 8d 6c  |immImmIiq......l|
> 000012e0  6d 4d 6c 6c 6d 6c 4d 4c  6d 6c 48 48 6d 4c 70 6d  |mMllmlMLmlHHmLpm|
> 000012f0  4d 69 69 6d 49 6d 69 4d  69 4d 69 6d 6d 6d 49 6d  |MiimImiMiMimmmIm|
> 00001300  69 6d 6d 4d 69 6d 69 6d  4d 69 6d 6d 69 4d 69 6e  |immMimimMimmiMin|
> 00001310  6d 6d 69 6d 6d 6e 6d 6d  69 6d 6e 6d 6d 6d 6e 6d  |mmimmnmmimnmmmnm|
> 00001320

And the plot thickens:

A couple minutes later:

> 00001160  22 20 0a 09 61 6c 74 3d  22 41 6c 70 68 61 20 50  |" ..alt="Alpha P|
> 00001170  6f 77 65 72 65 64 22 3e  0a 3c 2f 74 64 3e 0a 3c  |owered">.</td>.<|
> 00001180  74 64 20 77 69 64 74 68  3d 22 32 30 25 22 3e 0a  |td width="20%">.|
> 00001190  3c 69 6d 67 20 61 6c 69  67 6e 3d 22 72 69 67 68  |<img align="righ|
> 000011a0  74 22 20 20 73 72 63 3d  22 2f 76 6d 73 2f 70 6f  |t"  src="/vms/po|
> 000011b0  77 65 72 65 64 62 79 32  2e 67 69 66 22 20 61 6c  |weredby2.gif" al|
> 000011c0  74 3d 22 50 6f 77 65 72  65 64 20 62 79 20 56 4d  |t="Powered by VM|
> 000011d0  53 22 3e 0a 3c 2f 74 64  3e 0a 3c 2f 74 72 3e 0a  |S">.</td>.</tr>.|
> 000011e0  0a 0a 3c 74 72 3e 3c 74  64 3e 3c 70 3e 3c 2f 74  |..<tr><td><p></t|
> 000011f0  64 3e 3c 2f 74 72 3e 0a  0a 3c 2f 74 61 62 6c 65  |d></tr>..</table|
> 00001200  3e 0a 0a 3c 2f 62 6f 64  79 3e 0a 3c 2f 68 74 6d  |>..</body>.</htm|
> 00001210  6c 3e 0a                                          |l>.|
> 00001213


Which means that it finally terminated the file properly. Interesting.


And the plot thickens even more...

Redoing the same test now brings back the same pattern as the first one
in this message beyond the end of file.