<div class="gmail_quote">On Fri, May 8, 2009 at 2:42 AM, Matthew Flatt <<a href="mailto:mflatt@cs.utah.edu">mflatt@cs.utah.edu</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> This looks like trying to swap in a thread that is dead or whose representation has been overwritten with 0s due to memory corruption. What kinds of values are being finalized through will executors? The crash is happening during a will-procedure callback. We can't tell from the trace whether it's crashing before or after the procedure has done its job, but is it possible that the will-procedure runs some low-level finalizer that corrupts memory? <div></div></blockquote><div> I grep through my source and didn't see any use of wills. I grepped through the dependent planet packages and didn't see any either. Are there any default wills used by mzscheme? It might not have to do with wills, however, as I encountered a second core dump and this had the different backtrace. Perhaps it crashed after the will callbacks? Thanks, yc Program terminated with signal 11, Segmentation fault. [New process 28895] #0 uncopy_stack (ok=0, b=0xb44b00a0, prev=0xbf3602c0) at ./../src/setjmpup.c:329 329 { #1 0x0813d2dc in uncopy_stack (ok=<value optimized out>, b=0xb44b00a0, prev=0xbf360620) at ./../src/setjmpup.c:339 #2 0x0813d2dc in uncopy_stack (ok=<value optimized out>, b=0xb44b00a0, prev=0xbf360980) at ./../src/setjmpup.c:339 #3 0x0813d2dc in uncopy_stack (ok=<value optimized out>, b=0xb44b00a0, prev=0xbf360ce0) at ./../src/setjmpup.c:339 #4 0x0813d2dc in uncopy_stack (ok=<value optimized out>, b=0xb44b00a0, prev=0xbf361040) at ./../src/setjmpup.c:339 #5 0x0813d2dc in uncopy_stack (ok=<value optimized out>, b=0xb44b00a0, prev=0xbf3613a0) at ./../src/setjmpup.c:339 #6 0x0813d2dc in uncopy_stack (ok=<value optimized out>, b=0xb44b00a0, prev=0xbf361700) at ./../src/setjmpup.c:339 #7 0x0813d2dc in uncopy_stack (ok=<value optimized out>, b=0xb44b00a0, prev=0xbf361a60) at ./../src/setjmpup.c:339 #8 0x0813d2dc in uncopy_stack (ok=<value optimized out>, b=0xb44b00a0, prev=0xbf361dc0) at ./../src/setjmpup.c:339 #9 0x0813d2dc in uncopy_stack (ok=<value optimized out>, b=0xb44b00a0, prev=0xbf362120) at ./../src/setjmpup.c:339 ... (repeat) ... #14546 0x0813d2dc in uncopy_stack (ok=<value optimized out>, b=0xb44b00a0, prev=0xbff5c768) at ./../src/setjmpup.c:339 #14547 0x0813d33c in scheme_longjmpup (b=0xb44b00a0) at ./../src/setjmpup.c:620 #14548 0x08183f9a in do_swap_thread () at ./../src/thread.c:2516 #14549 0x081869d1 in scheme_thread_block (sleep_time=0) at ./../src/thread.c:4062 #14550 0x08188da2 in scheme_out_of_fuel () at ./../src/thread.c:3524 #14551 0x080a49f0 in scheme_proc_struct_name_source (a=0xb44b0328) at ./../src/fun.c:3145 #14552 0x080a5777 in scheme_get_proc_name (p=0xb44b02f8, len=0xbff5cce4, for_error=-1) at ./../src/fun.c:3201 #14553 0x0818abd8 in make_subprocess (child_thunk=0xb44b02f8, child_start=0xbff5cd24, config=0xb49dd188, cells=0xb44b02d0, ---Type <return> to continue, or q <return> to quit--- break_cell=0xb79304b8, mgr=0x0, normal_kill=1) at ./../src/thread.c:2868 #14554 0x0818ae63 in scheme_thread_w_details (thunk=0xb44b02f8, config=0x0, cells=0x0, break_cell=0x0, mgr=0x0, suspend_to_kill=0) at ./../src/thread.c:3110 #14555 0x0818aeb9 in scheme_thread (thunk=0xb3426a08) at ./../src/thread.c:2904 #14556 0x0818ba4e in sch_thread (argc=1, args=0xb5d14f6c) at ./../src/thread.c:2912 #14557 0x00116ce6 in ?? () #14558 0x00000001 in ?? () #14559 0xb5d14f6c in ?? () #14560 0x08b814c0 in ?? () #14561 0x0032bcb3 in ?? () #14562 0xbff5cdcc in ?? () #14563 0x00000001 in ?? () #14564 0xb5d14f9c in ?? () #14565 0xb5dd9640 in ?? () #14566 0xb5d14f8c in ?? () #14567 0xbff5cdf4 in ?? () #14568 0x0011683a in ?? () #14569 0x0013a907 in ?? () #14570 0x00000000 in ?? () (gdb) </div></div>