Matrix power segfaults
Submitted by Dale Lukas Peterson
Assigned to Nobody
Link to original bugzilla bug (#614)
Version: 3.2
Operating system: Linux
Description
Created attachment 347
Matrix power segfaults for trivial 2x2 matrix.
The attached file demonstrates pow() segfaulting on trivial matrix powers. I am using g++ (Gentoo 4.7.3 p1.0, pie-0.5.5) 4.7.3. Not all powers segfault, for example A.pow(1.0) does not. When I run the debugger (after compiling with -ggdb3), and step through until it segfaults, I get the following backtrace:
~/tmp/c++/eigen$ gdb ./matrix_power
GNU gdb (Gentoo 7.6 p1) 7.6
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License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html
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and "show warranty" for details.
This GDB was configured as "x86_64-pc-linux-gnu".
For bug reporting instructions, please see:
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Reading symbols from /home/hazelnusse/tmp/c++/eigen/matrix_power...done.
(gdb)
(gdb) list
1 // Compiled with:
2 //
3 // $ g++ -Wall matrix_power.cc -O2 -I/home/hazelnusse/usr/include/eigen3 -o matrix_power
4 //
5 #include <iostream>
6 #include <Eigen/Dense>
7 #include <unsupported/Eigen/MatrixFunctions>
8 int main()
9 {
10 Eigen::MatrixXcd A(2,2);
(gdb) b main
Breakpoint 1 at 0x401cd0: file matrix_power.cc, line 9.
(gdb) run
Starting program: /home/hazelnusse/tmp/c++/eigen/matrix_power
warning: Could not load shared library symbols for linux-vdso.so.1.
Do you need "set solib-search-path" or "set sysroot"?
Breakpoint 1, main () at matrix_power.cc:9
9 {
(gdb) n
10 Eigen::MatrixXcd A(2,2);
(gdb)
9 {
(gdb)
10 Eigen::MatrixXcd A(2,2);
(gdb)
11 A << 1, 1, 4, -2;
(gdb)
20 std::cout << A.pow(3.1) << "\n\n";
(gdb) print A
$1 = Eigen::Matrix<std::complex<double>,2,2,ColMajor> (data ptr: 0x632010) = {[0,0] = {_M_value = 1 + 0 * I}, [1,0] = {_M_value = 4 + 0 * I}, [0,1] = {_M_value = 1 + 0 * I}, [1,1] = {_M_value = -2 + 0 * I}}
(gdb) n
Program received signal SIGSEGV, Segmentation fault.
0x00000000004068b7 in Eigen::MatrixPowerTriangularAtomic<Eigen::Matrix<std::complex<double>, -1, -1, 0, -1, -1> >::compute2x2 (this=0x7fffffffd5d0,
res=Eigen::Matrix<std::complex<double>,0,0,ColMajor> (data ptr: 0x0), p=0.10000000000000009) at /home/hazelnusse/usr/include/eigen3/unsupported/Eigen/src/MatrixFunctions/MatrixPowerBase.h:330
330 res.coeffRef(0,0) = pow(m_A.coeff(0,0), p);
(gdb) bt
#0 0x00000000004068b7 in Eigen::MatrixPowerTriangularAtomic<Eigen::Matrix<std::complex<double>, -1, -1, 0, -1, -1> >::compute2x2 (this=0x7fffffffd5d0,
res=Eigen::Matrix<std::complex<double>,0,0,ColMajor> (data ptr: 0x0), p=0.10000000000000009) at /home/hazelnusse/usr/include/eigen3/unsupported/Eigen/src/MatrixFunctions/MatrixPowerBase.h:330
#1 0x00000000004165db in Eigen::MatrixPowerTriangularAtomic<Eigen::Matrix<std::complex<double>, -1, -1, 0, -1, -1> >::compute (this=this@entry=0x7fffffffd5d0,
res=Eigen::Matrix<std::complex<double>,0,0,ColMajor> (data ptr: 0x0), p=0.10000000000000009) at /home/hazelnusse/usr/include/eigen3/unsupported/Eigen/src/MatrixFunctions/MatrixPowerBase.h:304
#2 0x0000000000417432 in Eigen::MatrixPower<Eigen::Matrix<std::complex<double>, -1, -1, 0, -1, -1> >::computeFracPower<Eigen::Matrix<std::complex<double>, -1, -1, 0, -1, -1> > (this=this@entry=0x7fffffffd6e0,
res=Eigen::Matrix<std::complex<double>,2,2,ColMajor> (data ptr: 0x6320c0) = {...}, p=<optimized out>) at /home/hazelnusse/usr/include/eigen3/unsupported/Eigen/src/MatrixFunctions/MatrixPower.h:459
#3 0x00000000004187ed in Eigen::MatrixPower<Eigen::Matrix<std::complex<double>, -1, -1, 0, -1, -1> >::compute (this=this@entry=0x7fffffffd6e0,
res=Eigen::Matrix<std::complex<double>,2,2,ColMajor> (data ptr: 0x6320c0) = {...}, p=1.0717734625362931) at /home/hazelnusse/usr/include/eigen3/unsupported/Eigen/src/MatrixFunctions/MatrixPower.h:335
#4 0x0000000000418919 in Eigen::MatrixPowerReturnValue<Eigen::Matrix<std::complex<double>, -1, -1, 0, -1, -1> >::evalTo<Eigen::Matrix<std::complex<double>, -1, -1, 0, -1, -1> > (
this=this@entry=0x7fffffffd8f0, res=Eigen::Matrix<std::complex<double>,2,2,ColMajor> (data ptr: 0x6320c0) = {...})
at /home/hazelnusse/usr/include/eigen3/unsupported/Eigen/src/MatrixFunctions/MatrixPower.h:511
#5 0x00000000004189a6 in evalTo<Eigen::Matrix<std::complex<double>, -1, -1> > (dst=Eigen::Matrix<std::complex<double>,2,2,ColMajor> (data ptr: 0x6320c0) = {...}, this=0x7fffffffd8f0)
at /home/hazelnusse/usr/include/eigen3/Eigen/src/Core/ReturnByValue.h:61
#6 Eigen::Matrix<std::complex<double>, -1, -1, 0, -1, -1>::Matrix<Eigen::MatrixPowerReturnValue<Eigen::Matrix<std::complex<double>, -1, -1, 0, -1, -1> > > (this=0x7fffffffd830, other=...)
at /home/hazelnusse/usr/include/eigen3/Eigen/src/Core/Matrix.h:296
#7 0x0000000000418aaa in eval (this=0x7fffffffd8f0) at /home/hazelnusse/usr/include/eigen3/Eigen/src/Core/DenseBase.h:357
#8 Eigen::operator<< <Eigen::ReturnByValue<Eigen::MatrixPowerReturnValue<Eigen::Matrix<std::complex<double>, -1, -1, 0, -1, -1> > > > (s=..., m=...)
at /home/hazelnusse/usr/include/eigen3/Eigen/src/Core/IO.h:244
#9 0x0000000000401de9 in main () at matrix_power.cc:20
(gdb) I'm not sure how to proceed next...
Attachment 347, "Matrix power segfaults for trivial 2x2 matrix.":
matrix_power.cc