[Rd] segfault using svm from e1071 (PR#1178)

[Jan Rychter]

>>>>> "David" == David Meyer <david.meyer@ci.tuwien.ac.at> writes:
 David> jan@rychter.com wrote:
 >>
 >> This could be a bug in the e1071 svm code, but maybe not -- I guess
 >> I'll send it here anyway. It's reproducible.

 David> Which version of e1071 are you using (Current: 1.2-1)? This
 David> package had a bug fix release one month ago.

To follow up on this (yes, I'm using 1.2-1), here is the backtrace. Hope
it helps.

> library(e1071)
>      x <- seq (0.1,5,by=0.05)
>      y <- log(x) + rnorm (x, sd=0.2)
>      m   <- svm (x,y)

Program received signal SIGSEGV, Segmentation fault.
0x4011ffe8 in realloc () from /lib/libc.so.6
(gdb) bt
#0  0x4011ffe8 in realloc () from /lib/libc.so.6
#1  0x403859ea in Cache::get_data (this=0x8b01d00, index=145759521, data=0xbfffd9b4, 
    len=99) at svm.cpp:126
#2  0x4038b239 in SVR_Q::get_Q (this=0xbfffdb00, i=100, len=198) at svm.cpp:1223
#3  0x4038658d in Solver::Solve (this=0xbfffdb50, l=198, Q=@0xbfffdb00, b_=0x8b01148, 
    y_=0x8b01780 '\001' <repeats 99 times>, 'ÿ' <repeats 99 times>, alpha_=0x8b00b10, 
    Cp=1, Cn=1, eps=0.001, si=0xbfffdc20, shrinking=1) at svm.cpp:534
#4  0x40388249 in solve_epsilon_svr (prob=0xbfffde40, param=0xbfffde50, alpha=0x8b007f0, 
    si=0xbfffdc20) at svm.cpp:1195
#5  0x40388aac in svm_train_one (prob=0xbfffde40, param=0xbfffde50, Cp=0, Cn=0)
    at svm.cpp:1505
#6  0x40388c54 in svm_train (prob=0xbfffde40, param=0xbfffde50) at svm.cpp:1584
#7  0x40384202 in svmtrain () from /local/lib/R/library/e1071/libs/e1071.so
#8  0x0808ccd9 in do_dotCode ()
#9  0x08093e23 in Rf_eval ()
#10 0x0809546a in do_set ()
#11 0x08093c6e in Rf_eval ()
#12 0x08094db9 in do_begin ()
#13 0x08093c6e in Rf_eval ()
#14 0x08094238 in Rf_applyClosure ()
#15 0x080b423b in applyMethod ()
#16 0x080b47ce in Rf_usemethod ()
#17 0x080b49dd in do_usemethod ()
#18 0x08093c6e in Rf_eval ()
#19 0x08094238 in Rf_applyClosure ()
#20 0x08093eaa in Rf_eval ()
#21 0x0809546a in do_set ()
#22 0x08093c6e in Rf_eval ()
#23 0x080a906b in R_ReplConsole ()
#24 0x080a980a in run_Rmainloop ()
#25 0x080ff8e8 in main ()
#26 0x400bb5b0 in __libc_start_main () from /lib/libc.so.6
(gdb) 


--Jan

 > x <- seq (0.1,5,by=0.05) y <- log(x) + rnorm (x, sd=0.2)
 > library(e1071) m <- svm (x,y)
 >>
 >> Process R segmentation fault at Tue Nov 20 23:34:19 2001
 >>
 > version
 >> _ platform i686-pc-linux-gnu arch i686 os linux-gnu system i686,
 >> linux-gnu status major 1 minor 3.1 year 2001 month 08 day 31
 >> language R
 >>
 >> I used the Mandrake 8.0 RPM binaries from cran.r-project.org first,
 >> then recompiled R myself and reinstalled e1071. Same results.
 >>
 >> thanks, --J.

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