[OpenAFS-devel] Corruption somewhere in the cache flushing on S/390
Adam Thornton
adam@fsf.net
Tue, 20 Feb 2001 13:26:41 -0600
The S/390 client can read and write to an S/390 server OK. And as long
as the machine stays up (and thus, presumably, the files stay in the
cache) things are OK.
But after the first reboot, when I restart everything, the last two
bytes of each 4096-byte block are corrupted--the next-to-last is zero,
and the last is usually not, but not what the original was either. See
"diffs" at the end.
Then after the *next* reboot, more stuff changes. This time the last
byte changes again in some cases. There's also a bizarre case of a
change *not* on a 4K boundary. ("2-diffs")
So, the first question is, where should I start looking to figure out
which buffer is getting incorrectly fenceposted? The second is, has
this appeared on any other platforms?
Adam
-----------------Begin "diffs"---------------------------
*** orig.xdump Tue Feb 20 12:42:06 2001
--- post-reboot.xdump Tue Feb 20 12:43:00 2001
***************
*** 256 ****
! 00000ff0 6739ba49 fb2671d4 01ee3595 6320291b g9.I.&q...5.c ).
--- 256 ----
! 00000ff0 6739ba49 fb2671d4 01ee3595 63200034 g9.I.&q...5.c .4
***************
*** 512 ****
! 00001ff0 9babf76e 73ed7e6d dabcc27a 49b18f1e ...ns.~m...zI...
--- 512 ----
! 00001ff0 9babf76e 73ed7e6d dabcc27a 49b10000 ...ns.~m...zI...
***************
*** 768 ****
! 00002ff0 0ae36a67 52d450a2 c45938be 0ac3013d ..jgR.P..Y8....=
--- 768 ----
! 00002ff0 0ae36a67 52d450a2 c45938be 0ac30000 ..jgR.P..Y8.....
***************
*** 1024 ****
! 00003ff0 ea969336 851b270e 988f94fd 15d65307 ...6..'.......S.
--- 1024 ----
! 00003ff0 ea969336 851b270e 988f94fd 15d60000 ...6..'.........
***************
*** 1280 ****
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--- 1280 ----
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***************
*** 1536 ****
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***************
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***************
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***************
*** 2560 ****
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***************
*** 3840 ****
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***************
*** 4096 ****
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***************
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***************
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***************
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--- 10752 ----
! 00029ff0 f4028521 c9a2904c d6dcbd20 ab1400f7 ...!...L... ....
---------------End "diffs"---------------------
---------------Begin "2-diffs"-----------------
*** post-reboot.xdump Tue Feb 20 12:43:00 2001
--- 2reboots.xdump Tue Feb 20 13:10:33 2001
***************
*** 256 ****
! 00000ff0 6739ba49 fb2671d4 01ee3595 63200034 g9.I.&q...5.c .4
--- 256 ----
! 00000ff0 6739ba49 fb2671d4 01ee3595 63200024 g9.I.&q...5.c .$
***************
*** 832 ****
! 000033f0 2796a5de 028dd52e 2b4090c6 946d9efa '.......+@...m..
--- 832 ----
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***************
*** 1536 ****
! 00005ff0 69c75f4b 604b9049 d40b5a49 52c100f7 i._K`K.I..ZIR...
--- 1536 ----
! 00005ff0 69c75f4b 604b9049 d40b5a49 52c10000 i._K`K.I..ZIR...
***************
*** 8192 ****
! 0001fff0 a92193f9 b5b6535f 63f48737 597e003c .!....S_c..7Y~.<
--- 8192 ----
! 0001fff0 a92193f9 b5b6535f 63f48737 597e00a4 .!....S_c..7Y~..
---------------End "2-diffs"-----------------