Yeah, I saw that but didn't get a chance to investigate. Will look when I get home or hopefully Jameson/Keno/Jeff will see. If you want to debug the bootstrap issue you can run (in base/):
gdb ../julia --build ../usr/lib/julia/sys0 sysimg.jl On Saturday, September 20, 2014, Erik Schnetter <[email protected]> wrote: > The MEMDEBUG option leads to a bootstrap failure, so this doesn't help > me at the moment <https://github.com/JuliaLang/julia/issues/8422>... > Do you have other pointers? > > -erik > > On Thu, Sep 18, 2014 at 8:44 PM, Isaiah Norton <[email protected] > <javascript:;>> wrote: > > See MEMDEBUG in options.h > > > > On Sep 18, 2014 8:28 PM, "Erik Schnetter" <[email protected] > <javascript:;>> wrote: > >> > >> I have a Julia application that uses MPI to communicate between several > >> processes. Each process uses many tasks, and they send functions to > remote > >> locations to be executed. > >> > >> If I use a large number of tasks per process, I receive segfaults. > >> Sometimes I am able to obtain a stack backtrace, and these segfaults > usually > >> occur in array.c or in gc.c in routines related to memory allocation, > often > >> for increasing the buffer size for serialization. I've added a few > assert > >> statements there and examined the code, and it seems that these routines > >> themselves are not to blame. My next assumption is thus that, somewhere, > >> someone is overwriting memory, and libc's malloc's internal data > structures > >> are accidentally overwritten. > >> > >> - Do you have pointers for debugging this in Julia? > >> - Is there a "memory-debug" mode for Julia, for its garbage collector, > for > >> flisp, for flisp's garbage collector, ...? > >> - Is there a way to rebuild Julia with more aggressive self-checking > >> enabled? > >> > >> I can reproduce the error quite reliably, but it always occurs at a > >> different place. Unfortunately, the error goes away if I reduce the > number > >> of tasks or the number of processes > >> <https://en.wikipedia.org/wiki/Heisenbug>. > >> > >> -erik > >> > > > > > > -- > Erik Schnetter <[email protected] <javascript:;>> > http://www.perimeterinstitute.ca/personal/eschnetter/ >
