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Hi Jim, Can you send me a copy of the package and an R script that causes the problem and I'll take a look at it. D. James Bullard wrote: > Hello, first off, thanks for all of the previous help; hopefully someone > will have some insight on this question. I am attempting to track down a > segmentation fault which occurs only after a detach(2) is called in the > code (I have replaced the detach(2) with detach(package:DSA) and that > fails as well (furthermore, I have removed the detach calls and it does > not segfault)). It has proved difficult to track down (at least for me) > because it does not happen when the call is made, detach returns and > then some seconds (~ 30 seconds - 1 minute) later a segmentation fault > occurrs. I have run it in the debugger and the backtrace is below. When > I step through the code of do_detach it does not appear to be happening > at any consistent location. I assume this means that some worker thread > is involved, but the bactrace is not helpful (at least to me). > > 1.) Can I improve the backtrace message after the segfault to increase > message potential. > 2.) Can I set some breakpoints elsewhere which might be more instructive > as I do not see much going on in do_detach? suggestions? > > The library I am working with is in C and uses Nag, it uses the > registration facilities, although I have the problem when I do not use > the registration facilities. Specifically, I have defined the method: > void R_init_DSA(DllInfo *info). However, as I said if I comment this out > it appears to behave identically. > > Also, I have run the whole test case using valgrind to see if I could > track down the problem there (I assume I am trashing some of R's memory) > however, the only messages I get from valgrind are below - all related > to the registration code. It does not appear to seg fault when I run it > in valgrind, but I have no idea why this would be the case as I am > *very* new to valgrind. > > I am a little out of my league here so any help would be greatly > appreciated. OS and R version information is below. Thanks as always for > all of the help. > > thanks, jim > > > R.version > > platform i686-pc-linux-gnu > arch i686 > os linux-gnu > system i686, linux-gnu > status > major 2 > minor 2.0 > year 2005 > month 10 > day 06 > svn rev 35749 > language R > > > (gdb) backtrace > #0 0xb71655d0 in ?? () > #1 0x0872fc70 in ?? () > #2 0x0872fc58 in ?? () > #3 0xb69b7ab8 in ?? () > #4 0xb71654d5 in ?? () > #5 0x00000000 in ?? () > #6 0x00000000 in ?? () > #7 0x4399ca09 in ?? () > #8 0x00000000 in ?? () > #9 0x00000000 in ?? () > #10 0x00000000 in ?? () > #11 0x0872fc18 in ?? () > #12 0x08ee0fe0 in ?? () > #13 0x00000000 in ?? () > #14 0xb69c5c30 in __JCR_LIST__ () from /lib/tls/i686/cmov/libpthread.so.0 > #15 0xb69b7b4c in ?? () > #16 0xb69bcae0 in start_thread () from /lib/tls/i686/cmov/libpthread.so.0 > #17 0xb69bcae0 in start_thread () from /lib/tls/i686/cmov/libpthread.so.0 > #18 0xb7d09c9a in clone () from /lib/tls/i686/cmov/libc.so.6 > > ------------------------------------------------------------------------------------------------------------------------------------------- > ------------------------- valgrind output, after detach(.) is called > --------------------------------------------- > ------------------------------------------------------------------------------------------------------------------------------------------- > ==20262== Conditional jump or move depends on uninitialised value(s) > ==20262== at 0x1B92D888: R_getDLLRegisteredSymbol (Rdynload.c:665) > ==20262== by 0x1B92D9C5: R_dlsym (Rdynload.c:735) > ==20262== by 0x1B92D0BD: R_callDLLUnload (Rdynload.c:412) > ==20262== by 0x1B92D15B: DeleteDLL (Rdynload.c:439) > ==20262== > ==20262== Conditional jump or move depends on uninitialised value(s) > ==20262== at 0x1B92D8D2: R_getDLLRegisteredSymbol (Rdynload.c:681) > ==20262== by 0x1B92D9C5: R_dlsym (Rdynload.c:735) > ==20262== by 0x1B92D0BD: R_callDLLUnload (Rdynload.c:412) > ==20262== by 0x1B92D15B: DeleteDLL (Rdynload.c:439) > ==20262== > ==20262== Conditional jump or move depends on uninitialised value(s) > ==20262== at 0x1B92D8D7: R_getDLLRegisteredSymbol (Rdynload.c:681) > ==20262== by 0x1B92D9C5: R_dlsym (Rdynload.c:735) > ==20262== by 0x1B92D0BD: R_callDLLUnload (Rdynload.c:412) > ==20262== by 0x1B92D15B: DeleteDLL (Rdynload.c:439) > ==20262== > ==20262== Conditional jump or move depends on uninitialised value(s) > ==20262== at 0x1B92D8DB: R_getDLLRegisteredSymbol (Rdynload.c:696) > ==20262== by 0x1B92D9C5: R_dlsym (Rdynload.c:735) > ==20262== by 0x1B92D0BD: R_callDLLUnload (Rdynload.c:412) > ==20262== by 0x1B92D15B: DeleteDLL (Rdynload.c:439) > ==20262== > ==20262== Conditional jump or move depends on uninitialised value(s) > ==20262== at 0x1B92D8E0: R_getDLLRegisteredSymbol (Rdynload.c:696) > ==20262== by 0x1B92D9C5: R_dlsym (Rdynload.c:735) > ==20262== by 0x1B92D0BD: R_callDLLUnload (Rdynload.c:412) > ==20262== by 0x1B92D15B: DeleteDLL (Rdynload.c:439) > ==20262== > ==20262== Conditional jump or move depends on uninitialised value(s) > ==20262== at 0x1B92D8E4: R_getDLLRegisteredSymbol (Rdynload.c:711) > ==20262== by 0x1B92D9C5: R_dlsym (Rdynload.c:735) > ==20262== by 0x1B92D0BD: R_callDLLUnload (Rdynload.c:412) > ==20262== by 0x1B92D15B: DeleteDLL (Rdynload.c:439) > ==20262== > ==20262== Conditional jump or move depends on uninitialised value(s) > ==20262== at 0x1B92D8E9: R_getDLLRegisteredSymbol (Rdynload.c:711) > ==20262== by 0x1B92D9C5: R_dlsym (Rdynload.c:735) > ==20262== by 0x1B92D0BD: R_callDLLUnload (Rdynload.c:412) > ==20262== by 0x1B92D15B: DeleteDLL (Rdynload.c:439) > ==20262== > ==20262== Conditional jump or move depends on uninitialised value(s) > ==20262== at 0x1B92DA11: R_dlsym (Rdynload.c:749) > ==20262== by 0x1B92D0BD: R_callDLLUnload (Rdynload.c:412) > ==20262== by 0x1B92D15B: DeleteDLL (Rdynload.c:439) > ==20262== by 0x1B92DD94: do_dynunload (Rdynload.c:863) > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel - -- Duncan Temple Lang [EMAIL PROTECTED] Department of Statistics work: (530) 752-4782 371 Kerr Hall fax: (530) 752-7099 One Shields Ave. University of California at Davis Davis, CA 95616, USA -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (Darwin) iD8DBQFDmd1Z9p/Jzwa2QP4RAlsUAJ9C2NyYwUPQW3WkRf4TpRANoKhv0ACfSMxi TKpfiZg0JFYhFOPqvc67Bc4= =5eTz -----END PGP SIGNATURE----- ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
