Changes between Initial Version and Version 1 of Ipp025-20081103

Timestamp:

Feb 24, 2009, 4:23:57 PM (17 years ago)

Author:

trac

Comment:

--

Ipp025-20081103

@@ +1 @@
+I was exploring a couple of <code>fault = 4</code> ('programming') errors in the
+stacks I'm currently processing, and found that both processes died due
+to memory corruption, in different places in the code.  There are no
+known or suspected bugs in the code that would cause this.  Then I
+noticed that they both occurred on ipp025, which also recently crashed
+with the do_IRQ error.
+
+I suggest that the memory corruption I experienced is roughly equivalent
+to a memtest86 error, and conclude that ipp025 has bad memory.
+
+[wiki:User:Paul.Price Paul.Price] 13:34, 3 November 2008 (HST)
+
+
+<pre>
+2008-11-03 21:27:12Z|ipp025              |I|ppStack
+    Time to perform rejection on image 7: 20.196237 sec
+Memory Block ID: 16273299 @ 0x7f841cd084c0
+        Previous Block: 0x7f841cd08540 Next Block: 0x7f841cd08400
+        Free function: (nil)
+        Size: 8 Reference count: 1 Persistent: No
+        Posts: deadbeef deadbeef deadbcef
+        Allocated in vectorAlloc at (psVector.c:78)
+                by Thread ID 1127573840
+ 
+        Memory block is corrupted; buffer overflow detected.
+        Caught in vectorFree at (psVector.c:44).
+ 
+p_psMemDecrRefCounter (psMemory.c:800) Unsafe to Continue
+</pre>
+
+<pre>
+2008-11-03 21:30:29Z|ipp025              |I|psModules.imcombine
+    Mean deviation from 98 stamps: 0.188637 +/- 0.197773
+Memory Block ID: 4541300 @ 0x7f0272aba770
+        Previous Block: 0x7f0272aba900 Next Block: 0x7f0272aba7f0
+        Free function: 0x7f028e2d1210
+        Size: 16 Reference count: 1 Persistent: No
+        Posts: deadbeef deadbeef deadbcef
+        Allocated in pmSubtractionConvolve at (pmSubtraction.c:1282)
+                by Thread ID 139648987760368
+ 
+        Memory block is corrupted; buffer overflow detected.
+        Caught in psArrayElementsFree at (psArray.c:239).
+ 
+p_psMemDecrRefCounter (psMemory.c:800) Unsafe to Continue
+ 
+Aborting.  Error stack:
+</pre>
+
+<pre>
+mysql> select hostname, path_base from stackSumSkyfile join stackRun
+using(stack_id) where label = 'pap_md_nov2008' and fault = 4;
++----------+-------------------------------------------------------------------------------------+
+| hostname | path_base                  |
++----------+-------------------------------------------------------------------------------------+
+| ipp025   | neb://ipp010/md_demo_Nov2008//FIXNS/skycell.02874.13/FIXNS.skycell.02874.13.stk.375 |
+| ipp025   | neb://ipp010/md_demo_Nov2008//FIXNS/skycell.02878.62/FIXNS.skycell.02878.62.stk.434 |
++----------+-------------------------------------------------------------------------------------+
+2 rows in set (0.00 sec)
+</pre>