-----Original Message-----
From: R-SIG-Debian [mailto:r-sig-debian-bounces at r-project.org] On Behalf Of Rolf Turner
Sent: Thursday, 19 January 2017 10:11 AM
To: Ian Erickson
Cc: r-sig-debian at r-project.org
Subject: Re: [R-sig-Debian] [FORGED] Taking determinant of a matrix of NAs results in intermittent memory corruption
On 19/01/17 11:54, Ian Erickson wrote:
Greetings; I've posted the following to R's bug tracking system (at https://bugs.r-project.org/bugzilla/show_bug.cgi?id=17210 ) and Martin Maechler requested that I post to this list as well.
If I start R from the command line with --vanilla, then repeatedly execute the following line:
det(matrix(nrow=10,ncol=10))
... I eventually get a crash, with error:
*** Error in `/usr/lib/R/bin/exec/R': malloc(): memory corruption:
0x0000000002399400 ***
Is anyone able to reproduce?
I can't. I tried
for(i in 1:100000) det(matrix(nrow=10,ncol=10))
I can. It's repeatable as well.
CPU is Intel Xeon E5-2630v3
Ubuntu 14.04.5 LTS
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R 25596 kgore4 mem REG 8,4 39272 118292573 /usr/lib/R/modules/lapack.so
R 25596 kgore4 mem REG 8,4 5882272 118096040 /usr/lib/lapack/liblapack.so.3.0
R 25596 kgore4 mem REG 8,4 23058832 118129172 /usr/lib/openblas-base/libblas.so.3
det(matrix(nrow=10,ncol=10))
[1] NA
det(matrix(nrow=10,ncol=10))
[1] NA
det(matrix(nrow=10,ncol=10))
[1] NA
det(matrix(nrow=10,ncol=10))
[1] NA
det(matrix(nrow=10,ncol=10))
*** Error in `/usr/lib/R/bin/exec/R': malloc(): memory corruption: 0x0000000001393090 ***
Aborted (core dumped)
It doesn't seem to matter what happens after the 4th execution it throws it out. Eg I just started mashing the keyboard
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det(matrix(nrow=10,ncol=10))
[1] NA
det(matrix(nrow=10,ncol=10))
[1] NA
det(matrix(nrow=10,ncol=10))
[1] NA
det(matrix(nrow=10,ncol=10))
[1] NA
sdfsdfjkjsdhfkjsdhfk*** Error in `/usr/lib/R/bin/exec/R': malloc(): memory corruption: 0x00000000025c4090 ***