View difference between Paste ID: aBx2FTcK and MR2JQtgR

 $ gdb racket core.10189
 GNU gdb (GDB) Amazon Linux (7.2-56.12.amzn1)
 Copyright (C) 2010 Free Software Foundation, Inc.
 License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
 This is free software: you are free to change and redistribute it.
 There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
 and "show warranty" for details.
 This GDB was configured as "x86_64-amazon-linux-gnu".
 For bug reporting instructions, please see:
 <http://www.gnu.org/software/gdb/bugs/>...
 Reading symbols from /home/ec2-user/racket/bin/racket...done.
 
 warning: core file may not match specified executable file.
 [New Thread 10189]
 [New Thread 10190]
 Missing separate debuginfo for
 Try: yum --disablerepo='*' --enablerepo='*-debug*' install /usr/lib/debug/.build-id/d0/62d7a259ca51372f2fa0b2d9b25626dfd14041
 Reading symbols from /lib64/libdl.so.2...(no debugging symbols found)...done.
 Loaded symbols for /lib64/libdl.so.2
 Reading symbols from /lib64/libm.so.6...(no debugging symbols found)...done.
 Loaded symbols for /lib64/libm.so.6
 Reading symbols from /lib64/libpthread.so.0...(no debugging symbols found)...done.
 [Thread debugging using libthread_db enabled]
 Loaded symbols for /lib64/libpthread.so.0
 Reading symbols from /lib64/libc.so.6...(no debugging symbols found)...done.
 Loaded symbols for /lib64/libc.so.6
 Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done.
 Loaded symbols for /lib64/ld-linux-x86-64.so.2
 Reading symbols from /lib64/libcrypto.so.1.0.1e...Reading symbols from /usr/lib/debug/lib64/libcrypto.so.1.0.1e.debug...done.
 done.
 Loaded symbols for /lib64/libcrypto.so.1.0.1e
 Reading symbols from /lib64/libz.so.1.2.5...Reading symbols from /usr/lib/debug/lib64/libz.so.1.2.5.debug...done.
 done.
 Loaded symbols for /lib64/libz.so.1.2.5
 Reading symbols from /usr/lib64/libssl.so.1.0.1e...Reading symbols from /usr/lib/debug/usr/lib64/libssl.so.1.0.1e.debug...done.
 done.
 Loaded symbols for /usr/lib64/libssl.so.1.0.1e
 Reading symbols from /lib64/libgssapi_krb5.so.2...(no debugging symbols found)...done.
 Loaded symbols for /lib64/libgssapi_krb5.so.2
 Reading symbols from /lib64/libkrb5.so.3...(no debugging symbols found)...done.
 Loaded symbols for /lib64/libkrb5.so.3
 Reading symbols from /lib64/libcom_err.so.2...(no debugging symbols found)...done.
 Loaded symbols for /lib64/libcom_err.so.2
 Reading symbols from /lib64/libk5crypto.so.3...(no debugging symbols found)...done.
 Loaded symbols for /lib64/libk5crypto.so.3
 Reading symbols from /lib64/libkrb5support.so.0...(no debugging symbols found)...done.
 Loaded symbols for /lib64/libkrb5support.so.0
 Reading symbols from /lib64/libkeyutils.so.1.3...Reading symbols from /usr/lib/debug/lib64/libkeyutils.so.1.3.debug...done.
 done.
 Loaded symbols for /lib64/libkeyutils.so.1.3
 Reading symbols from /lib64/libresolv.so.2...(no debugging symbols found)...done.
 Loaded symbols for /lib64/libresolv.so.2
 Reading symbols from /lib64/libselinux.so.1...(no debugging symbols found)...done.
 Loaded symbols for /lib64/libselinux.so.1
 Reading symbols from /lib64/libnss_files.so.2...(no debugging symbols found)...done.
 Loaded symbols for /lib64/libnss_files.so.2
 Core was generated by `/usr/local/racket-bin/racket mcs-master.rkt'.
 Program terminated with signal 6, Aborted.
 #0  0x00007f07e33598a5 in raise () from /lib64/libc.so.6
 Missing separate debuginfos, use: debuginfo-install glibc-2.12-1.80.42.amzn1.x86_64 krb5-libs-1.9-33.22.amzn1.x86_64 libcom_err-1.42.3-2.16.amzn1.x86_64 libselinux-2.1.6-6.12.amzn1.x86_64
 (gdb) bt
 #0  0x00007f07e33598a5 in raise () from /lib64/libc.so.6
 #1  0x00007f07e335b085 in abort () from /lib64/libc.so.6
 #2  0x000000000077dcd7 in fault_handler (sn=11, si=0xccb530, ctx=0xccb400) at ../../../racket/gc2/sighand.c:99
 #3  <signal handler called>
 #4  0x00000000006ced43 in scheme_uncopy_stack (ok=Cannot access memory at address 0x7fff6bae5c5c
 ) at ../../../racket/gc2/../src/setjmpup.c:327
 #5  0x00000000006cedf5 in scheme_uncopy_stack (ok=0, b=0x7f07d948af10, prev=0x7fff6bae6a00) at ../../../racket/gc2/../src/setjmpup.c:337
 #6  0x00000000006cedf5 in scheme_uncopy_stack (ok=0, b=0x7f07d948af10, prev=0x7fff6bae70d0) at ../../../racket/gc2/../src/setjmpup.c:337
 #7  0x00000000006cedf5 in scheme_uncopy_stack (ok=0, b=0x7f07d948af10, prev=0x7fff6bae77a0) at ../../../racket/gc2/../src/setjmpup.c:337
 #8  0x00000000006cedf5 in scheme_uncopy_stack (ok=0, b=0x7f07d948af10, prev=0x7fff6bae7e70) at ../../../racket/gc2/../src/setjmpup.c:337
 #9  0x00000000006cedf5 in scheme_uncopy_stack (ok=0, b=0x7f07d948af10, prev=0x7fff6bae8540) at ../../../racket/gc2/../src/setjmpup.c:337
 #10 0x00000000006cedf5 in scheme_uncopy_stack (ok=0, b=0x7f07d948af10, prev=0x7fff6bae8c10) at ../../../racket/gc2/../src/setjmpup.c:337
 #11 0x00000000006cedf5 in scheme_uncopy_stack (ok=0, b=0x7f07d948af10, prev=0x7fff6bae92e0) at ../../../racket/gc2/../src/setjmpup.c:337
 #12 0x00000000006cedf5 in scheme_uncopy_stack (ok=0, b=0x7f07d948af10, prev=0x7fff6bae99b0) at ../../../racket/gc2/../src/setjmpup.c:337
 #13 0x00000000006cedf5 in scheme_uncopy_stack (ok=0, b=0x7f07d948af10, prev=0x7fff6baea080) at ../../../racket/gc2/../src/setjmpup.c:337
 #14 0x00000000006cedf5 in scheme_uncopy_stack (ok=0, b=0x7f07d948af10, prev=0x7fff6baea750) at ../../../racket/gc2/../src/setjmpup.c:337
 #15 0x00000000006cedf5 in scheme_uncopy_stack (ok=0, b=0x7f07d948af10, prev=0x7fff6baeae20) at ../../../racket/gc2/../src/setjmpup.c:337
 <...>
 #4782 0x00000000006cedf5 in scheme_uncopy_stack (ok=0, b=0x7f07d948af10, prev=0x7fff6c2d8950) at ../../../racket/gc2/../src/setjmpup.c:337
 #4783 0x00000000006cedf5 in scheme_uncopy_stack (ok=0, b=0x7f07d948af10, prev=0x7fff6c2d9020) at ../../../racket/gc2/../src/setjmpup.c:337
 #4784 0x00000000006cedf5 in scheme_uncopy_stack (ok=0, b=0x7f07d948af10, prev=0x7fff6c2d96f0) at ../../../racket/gc2/../src/setjmpup.c:337
 #4785 0x00000000006cedf5 in scheme_uncopy_stack (ok=0, b=0x7f07d948af10, prev=0x7fff6c2d9dc0) at ../../../racket/gc2/../src/setjmpup.c:337
 #4786 0x00000000006cedf5 in scheme_uncopy_stack (ok=0, b=0x7f07d948af10, prev=0x7fff6c2da4a0) at ../../../racket/gc2/../src/setjmpup.c:337
 #4787 0x00000000006cf579 in scheme_longjmpup (b=0x7f07d948af10) at ../../../racket/gc2/../src/setjmpup.c:621
 #4788 0x0000000000727b32 in do_swap_thread () at ../../../racket/gc2/../src/thread.c:2544
 #4789 0x000000000072d5f4 in scheme_thread_block (sleep_time=0) at ../../../racket/gc2/../src/thread.c:4752
 #4790 0x0000000000454f6d in scheme_do_eval (obj=0x7f07da6aa770, num_rands=1, rands=0x7fff6c2db3b0, get_value=-1) at ../../../racket/gc2/../src/eval.c:2905
 #4791 0x00000000004769d6 in apply_k () at ../../../racket/gc2/../src/fun.c:1421
 #4792 0x0000000000476233 in scheme_top_level_do_worker (k=0x476901 <apply_k>, eb=1, new_thread=0, dyn_state=0x0) at ../../../racket/gc2/../src/fun.c:1253
 #4793 0x0000000000475c69 in scheme_top_level_do (k=0x476901 <apply_k>, eb=1) at ../../../racket/gc2/../src/fun.c:1141
 #4794 0x0000000000476aae in _apply (rator=0x7f07da6aa770, num_rands=1, rands=0x7fff6c2db3b0, multi=1, eb=1) at ../../../racket/gc2/../src/fun.c:1436
 #4795 0x0000000000476b14 in scheme_apply_multi (rator=0x7f07da6aa770, num_rands=1, rands=0x7fff6c2db3b0) at ../../../racket/gc2/../src/fun.c:1448
 #4796 0x0000000000738a64 in do_next_will (w=0x7f07dab26360) at ../../../racket/gc2/../src/thread.c:8009
 #4797 0x0000000000738f19 in will_executor_go (argc=1, argv=0x7f07d853df08) at ../../../racket/gc2/../src/thread.c:8093
 #4798 0x00007f07e3dede31 in ?? ()
 #4799 0x00007fff6c2db480 in ?? ()
 #4800 0x00007f07dbddfc80 in ?? ()
 #4801 0x0000000500000000 in ?? ()
 #4802 0x00007f07e3f716f8 in ?? ()
 #4803 0x0000000200000005 in ?? ()
 #4804 0x00007f07d853df20 in ?? ()
 #4805 0x0000000000000004 in ?? ()
 #4806 0x00007f07d853df40 in ?? ()
 #4807 0x00007f07d83bedc0 in ?? ()
 #4808 0x00007f07d853df20 in ?? ()
 #4809 0x00007fff6c2db4e0 in ?? ()
 #4810 0x00007f07d9b2f019 in ?? ()
 #4811 0x0000000000000000 in ?? ()
 (gdb) frame 4786
 #4786 0x00000000006cedf5 in scheme_uncopy_stack (ok=0, b=0x7f07d948af10, prev=0x7fff6c2da4a0) at ../../../racket/gc2/../src/setjmpup.c:337
 337
 (gdb) p b
 $1 = (Scheme_Jumpup_Buf *) 0x7f07d948af10
 (gdb) p *b
 $2 = {stack_from = 0x0, stack_copy = 0x0, stack_size = 0, stack_max_size = 0, cont = 0x0, buf = {jb = {{jb = {{__jmpbuf = {0, 0, 0, 0, 0, 0, 0, 0}, __mask_was_saved = 0,
             __saved_mask = {__val = {0 <repeats 16 times>}}}}, stack_frame = 0}}, gcvs = 0, gcvs_cnt = 0}, gc_var_stack = 0x0, external_stack = 0x0}