Sorry, I'm definitely not that well versed in linux. I received the following... / # /tmp/ld-musl-armhf.so.1 /usr/bin/gdb --args ls -l /tmp > 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 "armv7-alpine-linux-musleabihf". > Type "show configuration" for configuration details. > For bug reporting instructions, please see: > . > Find the GDB manual and other documentation resources online at: > . > > For help, type "help". > Type "apropos word" to search for commands related to "word"... > Reading symbols from ls... > (No debugging symbols found in ls) > (gdb) run > Starting program: /bin/ls -l /tmp > warning: Error disabling address space randomization: Operation not > permitted > warning: Could not trace the inferior process. > warning: ptrace: Operation not permitted > warning: Error restoring address space randomization: Operation not > permitted > During startup program exited with code 127. > Thanks! On Thu, Jan 11, 2024 at 11:03 AM Szabolcs Nagy wrote: > * Cody Wetzel [2024-01-10 09:59:18 -0600]: > > So maybe I'm not understanding how gdb works or is used. > > you have to run the process.. > > you never issued the gdb 'run' command. > > > I'm getting no > > meaningful output even though these commands should result in a > > segmentation fault. > > > > > / # gdb > > > Segmentation fault > > > / # /tmp/ld-musl-armhf.so.1 /usr/bin/gdb --args ls -l /tmp > > > 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 "armv7-alpine-linux-musleabihf". > > > Type "show configuration" for configuration details. > > > For bug reporting instructions, please see: > > > . > > > Find the GDB manual and other documentation resources online at: > > > . > > > For help, type "help". > > > Type "apropos word" to search for commands related to "word"... > > > Reading symbols from ls... > > > (No debugging symbols found in ls) > > > (gdb) > > > quit > > > / # /tmp/ld-musl-armhf.so.1 /usr/bin/gdb --args cd /tmp > > > 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 "armv7-alpine-linux-musleabihf". > > > Type "show configuration" for configuration details. > > > For bug reporting instructions, please see: > > > . > > > Find the GDB manual and other documentation resources online at: > > > . > > > For help, type "help". > > > Type "apropos word" to search for commands related to "word"... > > > cd: No such file or directory. > > > (gdb) > > > quit > > > / # /tmp/ld-musl-armhf.so.1 /usr/bin/gdb --args apk -h /tmp > > > 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 "armv7-alpine-linux-musleabihf". > > > Type "show configuration" for configuration details. > > > For bug reporting instructions, please see: > > > . > > > Find the GDB manual and other documentation resources online at: > > > . > > > For help, type "help". > > > Type "apropos word" to search for commands related to "word"... > > > Reading symbols from apk... > > > (No debugging symbols found in apk) > > > (gdb) bt > > > No stack. > > > (gdb) disas $pc-40,+80 > > > No registers. > > > (gdb) info reg > > > The program has no registers now. > > > > > > On Thu, Jan 4, 2024 at 8:48 AM Szabolcs Nagy wrote: > > > > > * Cody Wetzel [2024-01-03 11:20:29 -0600]: > > > > Hello musl team, > > > > > > > > I tried getting a core dump but I'm not sure if I'm doing something > > > wrong... > > > > > > > > / # cat /proc/sys/kernel/core_pattern/tmp/core-%e-%s-%u-%g-%p-%t/ # > > > > apk upgrade busybox > > > > --repository=https://dl-cdn.alpinelinux.org/alpine/v3.18/main > > > > --repository= > https://dl-cdn.alpinelinux.org/alpine/v3.18/communityfetch > > > > > > > > https://dl-cdn.alpinelinux.org/alpine/v3.18/community/armv7/APKINDEX.tar.gzfetch > > > > > > > > https://dl-cdn.alpinelinux.org/alpine/v3.18/main/armv7/APKINDEX.tar.gzfetch > > > > > > > > https://dl-cdn.alpinelinux.org/alpine/v3.17/main/armv7/APKINDEX.tar.gzfetch > > > > > > > > https://dl-cdn.alpinelinux.org/alpine/v3.17/community/armv7/APKINDEX.tar.gz(1/3) > > > > Upgrading busybox (1.35.0-r29 -> 1.36.1-r5)Executing > > > > busybox-1.36.1-r5.post-upgrade(2/3) Upgrading busybox-binsh > > > > (1.35.0-r29 -> 1.36.1-r5)(3/3) Upgrading ssl_client (1.35.0-r29 -> > > > > 1.36.1-r5)Executing busybox-1.36.1-r5.triggerOK: 5 MiB in 15 > packages/ > > > > # apk upgrade musl > > > > --repository=https://dl-cdn.alpinelinux.org/alpine/v3.18/main > > > > --repository= > https://dl-cdn.alpinelinux.org/alpine/v3.18/community(1/1) > > > > Upgrading musl (1.2.3-r5 -> 1.2.4-r2)OK: 5 MiB in 15 packages/ # apk > > > > upgrade rust --repository= > > > https://dl-cdn.alpinelinux.org/alpine/v3.18/main > > > > --repository= > > > https://dl-cdn.alpinelinux.org/alpine/v3.18/communitySegmentation > > > > fault/ # apk -hSegmentation fault/ # ls /tmp/core*Segmentation fault/ > > > > # cd /tmp/tmp # lsSegmentation fault > > > > > > i'd > > > > > > # cp /lib/ld-musl-armhf.so.1 /tmp > > > # apk add gdb musl-dbg apk-tools-static > > > > > > then upgrade musl using apk.static, then debug via > > > > > > # /tmp/ld-musl-armhf.so.1 /usr/bin/gdb --args ls -l /tmp > > > > > > or analyze a core dump, you can always install more debug tools > > > via apk.static and run commands using the old ld-musl-armhf.so.1 > > > > > > in gdb, you want to do > > > > > > bt > > > disas $pc-40,+80 > > > info reg > > > info proc map > > > > > > as a starting point and post the results. > > > > > > strace output can be useful too as well as readelf -aW of ld.so > > > depending on what is going on. > > > > > > > > > -- > > Cody Wetzel > > codyawetzel@gmail.com > > (402)490-9242 > -- Cody Wetzel codyawetzel@gmail.com (402)490-9242