Malformed core dumps on Guix System

mathieu@meije ~/tmp [env]$ cat test.c

#include <stdio.h>

int main() {

int *t = NULL;

return *t;

}

mathieu@meije ~/tmp [env]$ gcc test.c

mathieu@meije ~/tmp [env]$ ulimit -c unlimited

mathieu@meije ~/tmp [env]$ ulimit -a

real-time non-blocking time (microseconds, -R) unlimited

core file size (blocks, -c) unlimited

mathieu@meije ~/tmp [env]$ echo "/tmp/my-core-%p" | sudo tee /proc/sys/kernel/core_pattern

/tmp/my-core-%p

mathieu@meije ~/tmp [env]$ ./a.out

Segmentation fault (core dumped)

mathieu@meije ~/tmp [env]$ gdb ./a.out /tmp/my-core-5622

...

BFD: warning: /tmp/my-core-5622 has a segment extending past end of file

...

Failed to read a valid object file image from memory.

Core was generated by `./a.out'.

Program terminated with signal SIGSEGV, Segmentation fault.

#0 0x0000000000401102 in main ()

(gdb) bt

#0 0x0000000000401102 in main ()

Backtrace stopped: Cannot access memory at address 0x7fff14e14168

$ gcc test.c

$ ulimit -c unlimited

$ ./a.out

Segmentation fault (core dumped)

$ gdb a.out core

GNU gdb (GDB) 12.1

Copyright (C) 2022 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-unknown-linux-gnu".

Type "show configuration" for configuration details.

For bug reporting instructions, please see:

<https://www.gnu.org/software/gdb/bugs/>.

Find the GDB manual and other documentation resources online at:

<http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".

Type "apropos word" to search for commands related to "word"...

Reading symbols from a.out...

(No debugging symbols found in a.out)

[New LWP 23407]

Core was generated by `./a.out'.

Program terminated with signal SIGSEGV, Segmentation fault.

#0 0x0000000000401106 in main ()

(gdb) bt

#0 0x0000000000401106 in main ()

(gdb) quit

$ uname -a

Linux pfiuh07 5.13.0-40-generic #45~20.04.1-Ubuntu SMP Mon Apr 4 09:38:31 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

$ echo "/tmp/my-core-%p" | sudo tee /proc/sys/kernel/core_pattern

/tmp/my-core-%p

$ guix shell -C coreutils gcc-toolchain gdb

/tmp/bug-58923 [env]$ cat test.c

#include <stdio.h>

int main() {

int *t = NULL;

return *t;

}

/tmp/bug-58923 [env]$ gcc test.c

/tmp/bug-58923 [env]$ ulimit -a

real-time non-blocking time (microseconds, -R) unlimited

core file size (blocks, -c) 0

data seg size (kbytes, -d) unlimited

scheduling priority (-e) 0

file size (blocks, -f) unlimited

pending signals (-i) 255927

max locked memory (kbytes, -l) 65536

max memory size (kbytes, -m) unlimited

open files (-n) 1024

pipe size (512 bytes, -p) 8

POSIX message queues (bytes, -q) 819200

real-time priority (-r) 0

stack size (kbytes, -s) 9788

cpu time (seconds, -t) unlimited

max user processes (-u) 255927

virtual memory (kbytes, -v) unlimited

file locks (-x) unlimited

/tmp/bug-58923 [env]$ ulimit -c unlimited

/tmp/bug-58923 [env]$ ulimit -a

real-time non-blocking time (microseconds, -R) unlimited

core file size (blocks, -c) unlimited

data seg size (kbytes, -d) unlimited

scheduling priority (-e) 0

file size (blocks, -f) unlimited

pending signals (-i) 255927

max locked memory (kbytes, -l) 65536

max memory size (kbytes, -m) unlimited

open files (-n) 1024

pipe size (512 bytes, -p) 8

POSIX message queues (bytes, -q) 819200

real-time priority (-r) 0

stack size (kbytes, -s) 9788

cpu time (seconds, -t) unlimited

max user processes (-u) 255927

virtual memory (kbytes, -v) unlimited

file locks (-x) unlimited

/tmp/bug-58923 [env]$ ./a.out

Segmentation fault (core dumped)

/tmp/bug-58923 [env]$ ls /tmp/

bug-58923 my-core-23

/tmp/bug-58923 [env]$ gdb ./a.out /tmp/my-core-23

GNU gdb (GDB) 12.1

Copyright (C) 2022 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-unknown-linux-gnu".

Type "show configuration" for configuration details.

For bug reporting instructions, please see:

<https://www.gnu.org/software/gdb/bugs/>.

Find the GDB manual and other documentation resources online at:

<http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".

Type "apropos word" to search for commands related to "word"...

Reading symbols from ./a.out...

(No debugging symbols found in ./a.out)

[New LWP 23]

Core was generated by `./a.out'.

Program terminated with signal SIGSEGV, Segmentation fault.

#0 0x0000000000401106 in main ()

(gdb) bt

#0 0x0000000000401106 in main ()

(gdb) exit

/tmp/bug-58923 [env]$ exit

exit

$ guix describe

Generation 234 Nov 07 2022 00:27:58 (current)

guix 4a34da8

repository URL: https://git.savannah.gnu.org/git/guix.git

branch: master

commit: 4a34da845ed91821d38ba8a9b65ad650dd7488d1

$ $(guix system vm --no-graphic gnu/system/examples/bare-bones.tmpl) -m 1024

[…]

komputilo login: root

root

This is the GNU operating system, welcome!

root@komputilo ~# ulimit -c unlimited

ulimit -c unlimited

root@komputilo ~# guile -c '(use-modules (system foreign)) (dereference-pointer (make-pointer 1234))'

guile -c '(use-modules (system foreign)) (dereference-pointer (make-pointer 1234))'

[ 17.580329] guile[188]: segfault at 4d2 ip 00007f53893ff97f sp 00007ffede6ab190 error 4 in libguile-3.0.so.1.5.0[7f53893dc000+c8000]

[ 17.582412] Code: 66 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec 08 40 f6 c7 06 75 26 48 8b 07 83 e0 7f 48 83 f8 1f 75 1a 48 8b 47 08 48 85 c0 74 31 <48> 8b 38 31 f6 48 83 c4 08 e9 33 d1 fd ff 0f 1f 00 48 89 fa 48 8d

Segmentation fault (core dumped)

root@komputilo ~# uname -a

uname -a

Linux komputilo 6.0.7-gnu #1 SMP PREEMPT_DYNAMIC 1 x86_64 GNU/Linux

root@komputilo ~# echo "set debug-file-directory /gnu/store/9snhi90f2nivxqrvqgjgixdch5zkps88-guile-3.0.8-debug/lib/debug" >> ~/.gdbinit

echo "set debug-file-directory /gnu/store/9snhi90f2nivxqrvqgjgixdch5zkps88-guile-3.0.8-debug/lib/debug" >> ~/.gdbinit

root@komputilo ~# /gnu/store/8fg0nk7c0xylmb6vpz1hc2mx7k3nqw47-gdb-12.1/bin/gdb $(type -P guile) core

/gnu/store/8fg0nk7c0xylmb6vpz1hc2mx7k3nqw47-gdb-12.1/bin/gdb $(type -P guile) core

GNU gdb (GDB) 12.1

Copyright (C) 2022 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-unknown-linux-gnu".

Type "show configuration" for configuration details.

For bug reporting instructions, please see:

<https://www.gnu.org/software/gdb/bugs/>.

Find the GDB manual and other documentation resources online at:

<http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".

Type "apropos word" to search for commands related to "word"...

Reading symbols from /run/current-system/profile/bin/guile...

Reading symbols from /gnu/store/9snhi90f2nivxqrvqgjgixdch5zkps88-guile-3.0.8-debug/lib/debug//gnu/store/qlmpcy5zi84m6dikq3fnx5dz38qpczlc-guile-3.0.8/bin/guile.debug...

[New LWP 188]

warning: Unable to find libthread_db matching inferior's thread library, thread debugging will not be available.

Core was generated by `guile -c (use-modules (system foreign)) (dereference-pointer (make-pointer 1234'.

Program terminated with signal SIGSEGV, Segmentation fault.

--Type <RET> for more, q to quit, c to continue without paging--

#0 scm_dereference_pointer (pointer=0x7f5388a3d4f0) at foreign.c:375

375 foreign.c: No such file or directory.

;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0

;;; or pass the --no-auto-compile argument to disable.

;;; compiling /gnu/store/qlmpcy5zi84m6dikq3fnx5dz38qpczlc-guile-3.0.8/lib/libguile-3.0.so.1.5.0-gdb.scm

WARNING: (guile-user): imported module (gdb) overrides core binding `symbol?'

;;; /gnu/store/qlmpcy5zi84m6dikq3fnx5dz38qpczlc-guile-3.0.8/lib/libguile-3.0.so.1.5.0-gdb.scm:293:21: warning: possibly unbound variable `program-debug-info-name'

;;; /gnu/store/qlmpcy5zi84m6dikq3fnx5dz38qpczlc-guile-3.0.8/lib/libguile-3.0.so.1.5.0-gdb.scm:326:10: warning: possibly unbound variable `find-source-for-addr'

;;; /gnu/store/qlmpcy5zi84m6dikq3fnx5dz38qpczlc-guile-3.0.8/lib/libguile-3.0.so.1.5.0-gdb.scm:326:32: warning: possibly unbound variable `program-debug-info-addr'

;;; /gnu/store/qlmpcy5zi84m6dikq3fnx5dz38qpczlc-guile-3.0.8/lib/libguile-3.0.so.1.5.0-gdb.scm:327:32: warning: possibly unbound variable `program-debug-info-context'

;;; compiled /root/.cache/guile/ccache/3.0-LE-8-4.5/gnu/store/qlmpcy5zi84m6dikq3fnx5dz38qpczlc-guile-3.0.8/lib/libguile-3.0.so.1.5.0-gdb.scm.go

;;; compiling /gnu/store/qlmpcy5zi84m6dikq3fnx5dz38qpczlc-guile-3.0.8/share/guile/3.0/system/base/types.scm

;;; compiled /root/.cache/guile/ccache/3.0-LE-8-4.5/gnu/store/qlmpcy5zi84m6dikq3fnx5dz38qpczlc-guile-3.0.8/share/guile/3.0/system/base/types.scm.go

(gdb) bt

bt

#0 scm_dereference_pointer (pointer=#<pointer 0x4d2>) at foreign.c:375

#1 0x00007f5389478326 in vm_regular_engine (thread=0x7f5388913d80)

at vm-engine.c:972

#2 0x00007f53894855d9 in scm_call_n (proc=<optimized out>,

argv=<optimized out>, nargs=1) at vm.c:1610

#3 0x00007f53893ed457 in scm_primitive_eval (exp=<optimized out>,

exp@entry=(dereference-pointer (make-pointer 1234))) at eval.c:671

#4 0x00007f53893f34b6 in scm_eval (

exp=(dereference-pointer (make-pointer 1234)),

module_or_state="#<struct module>" = {...}) at eval.c:705

#5 0x00007f5389478326 in vm_regular_engine (thread=0x7f5388913d80)

at vm-engine.c:972

#6 0x00007f53894855d9 in scm_call_n (proc=<optimized out>,

argv=<optimized out>, nargs=1) at vm.c:1610

#7 0x00007f53893ed457 in scm_primitive_eval (exp=<optimized out>,

exp@entry=((@ (ice-9 control) %) (begin ((@@ (ice-9 command-line) eval-string/lang) "(use-modules (system foreign)) (dereference-pointer (make-pointer 1234))") (quit)))) at eval.c:671

#8 0x00007f53893f34b6 in scm_eval (

exp=((@ (ice-9 control) %) (begin ((@@ (ice-9 command-line) eval-string/lang) "(use-modules (system foreign)) (dereference-pointer (make-pointer 1234))") (quit))), module_or_state="#<struct module>" = {...}) at eval.c:705

#9 0x00007f53894573b6 in scm_shell (argc=3, argv=0x7ffede6abb48)

--Type <RET> for more, q to quit, c to continue without paging--

at script.c:357

#10 0x00007f538940249c in invoke_main_func (body_data=0x7ffede6aba00)

at init.c:312

#11 0x00007f53893eb85a in c_body (d=0x7ffede6ab920) at continuations.c:430

#12 0x00007f5389478326 in vm_regular_engine (thread=0x7f5388913d80)

at vm-engine.c:972

#13 0x00007f53894855d9 in scm_call_n (proc=<optimized out>,

argv=<optimized out>, nargs=2) at vm.c:1610

#14 0x00007f53893ed09a in scm_call_2 (proc=<optimized out>,

arg1=<optimized out>, arg2=<optimized out>) at eval.c:503

#15 0x00007f53894a3742 in scm_c_with_exception_handler.constprop.0 (type=#t,

handler_data=handler_data@entry=0x7ffede6ab8b0,

thunk_data=thunk_data@entry=0x7ffede6ab8b0, thunk=<optimized out>,

handler=<optimized out>) at exceptions.c:170

#16 0x00007f538947588f in scm_c_catch (tag=<optimized out>,

body=<optimized out>, body_data=<optimized out>, handler=<optimized out>,

handler_data=<optimized out>, pre_unwind_handler=<optimized out>,

pre_unwind_handler_data=0x7f5388991040) at throw.c:168

#17 0x00007f53893ede66 in scm_i_with_continuation_barrier (

pre_unwind_handler=0x7f53893edb80 <pre_unwind_handler>,

pre_unwind_handler_data=0x7f5388991040, handler_data=0x7ffede6ab920,

handler=0x7f53893f48b0 <c_handler>, body_data=0x7ffede6ab920,

body=0x7f53893eb850 <c_body>) at continuations.c:368

--Type <RET> for more, q to quit, c to continue without paging--

#18 scm_c_with_continuation_barrier (func=<optimized out>,

data=<optimized out>) at continuations.c:464

#19 0x00007f5389474b39 in with_guile (base=0x7ffede6ab9a8, data=0x7ffede6ab9d0)

at threads.c:645

#20 0x00007f538934b0ba in GC_call_with_stack_base ()

from /gnu/store/2lczkxbdbzh4gk7wh91bzrqrk7h5g1dl-libgc-8.0.4/lib/libgc.so.1

#21 0x00007f538946d8b8 in scm_i_with_guile (dynamic_state=<optimized out>,

data=<optimized out>, func=<optimized out>) at threads.c:688

#22 scm_with_guile (func=<optimized out>, data=<optimized out>)

at threads.c:694

#23 0x00007f538940b025 in scm_boot_guile (argc=argc@entry=3,

argv=argv@entry=0x7ffede6abb48,

main_func=main_func@entry=0x401230 <inner_main>, closure=closure@entry=0x0)

at init.c:295

#24 0x00000000004010f7 in main (argc=3, argv=0x7ffede6abb48) at guile.c:94

(gdb)

wget https://dump.guix.gnu.org/download/installer-dump-1c97b34e

tar -xvf installer-dump-1c97b34e

cd dump.2022-10-14.17.15.30

gdb $(type -P guile) core-dump

(gdb) bt

#0 linux_destroy (dev=0x268e620) at arch/linux.c:1615

#1 0x00007fee6ae9cd37 in chained_finalizer (obj=0x7fee54779370, data=0x7fee6790acc0) at finalizers.c:84

#2 0x00007fee6adf5e3f in GC_invoke_finalizers () at extra/../finalize.c:1281

#3 0x00007fee6ae9d429 in scm_run_finalizers () at finalizers.c:414

#4 0x00007fee6aea4482 in finalization_thread_proc (unused=<optimized out>) at finalizers.c:244

#5 0x00007fee6ae9085a in c_body (d=0x7fee69f21d80) at continuations.c:430

#6 0x00007fee6af1d326 in vm_regular_engine (thread=0x7fee6a3b8b40) at vm-engine.c:972

#7 0x00007fee6af2a5d9 in scm_call_n (proc=<optimized out>, argv=<optimized out>, nargs=2) at vm.c:1610

#8 0x00007fee6ae9209a in scm_call_2 (proc=<optimized out>, arg1=<optimized out>, arg2=<optimized out>) at eval.c:503

#9 0x00007fee6af48742 in scm_c_with_exception_handler.constprop.0 (type=#t, handler_data=handler_data@entry=0x7fee69f21d10, thunk_data=thunk_data@entry=0x7fee69f21d10, thunk=<optimized out>, handler=<optimized out>)

at exceptions.c:170

#10 0x00007fee6af1a88f in scm_c_catch (tag=<optimized out>, body=<optimized out>, body_data=<optimized out>, handler=<optimized out>, handler_data=<optimized out>, pre_unwind_handler=<optimized out>,

pre_unwind_handler_data=0x7fee6a436040) at throw.c:168

#11 0x00007fee6ae92e66 in scm_i_with_continuation_barrier (pre_unwind_handler=0x7fee6ae92b80 <pre_unwind_handler>, pre_unwind_handler_data=0x7fee6a436040, handler_data=0x7fee69f21d80, handler=0x7fee6ae998b0 <c_handler>,

body_data=0x7fee69f21d80, body=0x7fee6ae90850 <c_body>) at continuations.c:368

#12 scm_c_with_continuation_barrier (func=<optimized out>, data=<optimized out>) at continuations.c:464

#13 0x00007fee6af19b39 in with_guile (base=0x7fee69f21e08, data=0x7fee69f21e30) at threads.c:645

#14 0x00007fee6adf00ba in GC_call_with_stack_base (fn=fn@entry=0x7fee6af19a60 <with_guile>, arg=arg@entry=0x7fee69f21e30) at extra/../misc.c:2106

#15 0x00007fee6af128b8 in scm_i_with_guile (dynamic_state=<optimized out>, data=<optimized out>, func=<optimized out>) at threads.c:688

#16 scm_with_guile (func=<optimized out>, data=<optimized out>) at threads.c:694

#17 0x00007fee6adc6d7e in ?? () from /gnu/store/5h2w4qi9hk1qzzgi1w83220ydslinr4s-glibc-2.33/lib/libpthread.so.0

#18 0x00007fee6a9c4eff in clone () from /gnu/store/5h2w4qi9hk1qzzgi1w83220ydslinr4s-glibc-2.33/lib/libc.so.6