Date:
2022-08-31 11:11 |
Priority:
3 |
State:
Open |
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Submitted by:
Martin Maechler (mmaechler)
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Assigned to:
Nobody (None)
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Hardware:
None |
Product:
None |
Operating System:
Linux |
Component:
None |
Version:
None |
Severity:
None |
Resolution:
Accepted As Bug |
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URL:
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Summary:
Another memory corruption / seg.fault |
| Detailed description |
Found when looking for a repr.ex. for [#6610];
did not have time yet to run in the debugger or with valgrind. Just so we don't forget:
set.seed(47)
rN <- rsparsematrix(nrow=2669041, ncol=296289, nnz = 5288431, rand.x = NULL)
dim(X.X <- crossprod(rN)) ## 296289 296289
nnzero(X.X) # 10780717 = 10 mio = *twice* those in the [#6610] example
str(X.X)
## Formal class 'nsCMatrix' [package "Matrix"] with 6 slots
## ..@ i : int [1:5538503] 0 1 2 3 4 5 6 7 8 9 ...
## ..@ p : int [1:296290] 0 1 2 3 4 5 6 7 8 9 ...
## ..@ Dim : int [1:2] 296289 296289
## ..@ Dimnames:List of 2
## .. ..$ : NULL
## .. ..$ : NULL
## ..@ uplo : chr "U"
## ..@ factors : list()
qr(X.X)
## *** caught segfault ***
## address 0x119784650, cause 'memory not mapped'
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