Hi, On 12/16/2013 10:15, Nicholas Clark wrote:
Edited it to carry on with just NQP, and got a hit at 2013.Starting program: /home/nicholas/Sandpit/burndown1/bin/moar --libpath=src/vm/moar/stage0 src/vm/moar/stage0/nqp.moarvm --bootstrap --module-path=gen/moar/stage1 --setting-path=gen/moar/stage1 --setting=NQPCORE --target=mbc --no-regex-lib --output=gen/moar/stage1/nqp.moarvm gen/moar/stage1/NQP.nqp[Thread debugging using libthread_db enabled] Program received signal SIGSEGV, Segmentation fault. 0x00007ffff79c7308 in run_load (tc=0x6023f0, sr_data=0x7ffff6a42e38) at src/core/loadbytecode.c:109 109 if (cu->body.load_frame) { Missing separate debuginfos, use: debuginfo-install glibc-2.12-1.107.el6.x86_64 (gdb) p cu $1 = (MVMCompUnit *) 0x7ffff6a42e38 (gdb) p tc->nursery_fromspace $2 = (void *) 0x7ffff68a2000 (gdb) p tc->nursery_tospace $3 = (void *) 0x7ffff6a9a000 (gdb) where #0 0x00007ffff79c7308 in run_load (tc=0x6023f0, sr_data=0x7ffff6a42e38) at src/core/loadbytecode.c:109 #1 0x00007ffff79b707b in return_or_unwind (tc=0x6023f0, unwind=0 '\000') at src/core/frame.c:341 #2 0x00007ffff79b70d2 in MVM_frame_try_return (tc=0x6023f0) at src/core/frame.c:362 #3 0x00007ffff7998d7d in MVM_interp_run (tc=0x6023f0, initial_invoke=0x7ffff7a2fac3 <toplevel_initial_invoke>, invoke_data=0x74f570) at src/core/interp.c:279 #4 0x00007ffff7a2fbf0 in MVM_vm_run_file (instance=0x602010, filename=0x7fffffffe76d "src/vm/moar/stage0/nqp.moarvm") at src/moar.c:157 #5 0x0000000000400d2e in main (argc=11, argv=0x7fffffffe498) at src/main.c:137 It look like the stored value caller->special_return_data got moved: /* Switch back to the caller frame if there is one. */ if (caller && returner != tc->thread_entry_frame) { tc->cur_frame = caller; *(tc->interp_cur_op) = caller->return_address; *(tc->interp_bytecode_start) = caller->static_info->body.bytecode; *(tc->interp_reg_base) = caller->work; *(tc->interp_cu) = caller->static_info->body.cu; /* Handle any special return hooks. */ if (caller->special_return) { MVMSpecialReturn sr = caller->special_return; caller->special_return = NULL; if (!unwind) sr(tc, caller->special_return_data); } Again, I don't know what the fix should be, but having read the GC talk slides, my hunch is that it's "you can't be storing unpinned things in a C struct".
Well, you can, just make sure you update it. 9f7714d should fix this one. Thanks! Jonathan
