community/kasts crashes on Alpine edge, SIGKILL

Same on PlaMo edge image

changed title from Kasts SIGILL with pmOS edge Phosh on op6-enchilada to Kasts SIGILL with pmOS edge on op6-enchilada

Interesting, for me it launches just fine and I can listen to the postmarketOS podcast without any problems Both on an existing installation (my desktop) and a new installation (my laptop, just now).

That's going to make it hard to debug.

Probably something broken in libcrypto3 or whatever is called by kasts...

I'm more of a Debian guy, so I do not exactly look where to look: I've looked in the Alpine wiki but found nothing about dbg packages to get more information about this... both kasts and libcrypto3 seem NOT to have !dbg flag in their APKBUILD, so dbg packages should be available somewhere?

NOT to have !dbg flag in their APKBUILD, so dbg packages should be available somewhere?

No that's not how things work. -dbg packages need to explicitly be enabled by adding both $pkgname-dbg to $subpackages and by making sure the build system actually produces debug symbols. Kasts is build with -DCMAKE_BUILD_TYPE=RelWithDebInfo so the build system part is alright, but it doesn't have the debug package enabled in $subpackages. Debug packages are often quite big and take up a lot of mirror space so to enable it is decided on a case-by-case bases when needed.

libcrypto3 is part of the openssl package which does have openssl-dbg available, so that just needs to be installed.

Ok, building kasts including dbg wasn't that hard.

oneplus-enchilada:~$ apk search -v | grep kasts
kasts-23.08.3-r0 - Kirigami-based podcast player
kasts-dbg-23.08.3-r0 - Kirigami-based podcast player (debug symbols)
kasts-lang-23.08.3-r0 - Languages for package kasts
oneplus-enchilada:~$ apk search -v | grep openssl-dbg
openssl-dbg-3.1.4-r1 - Toolkit for Transport Layer Security (TLS) (debug symbols)
oneplus-enchilada:~$ gdb kasts
GNU gdb (GDB) 13.2
Copyright (C) 2023 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 "aarch64-alpine-linux-musl".
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 kasts...
Reading symbols from /usr/lib/debug//usr/bin/kasts.debug...
(gdb) run
Starting program: /usr/bin/kasts 

Program received signal SIGILL, Illegal instruction.
0x0000fffff4dae000 in ?? () from /lib/libcrypto.so.3
(gdb) bt
#0  0x0000fffff4dae000 in ?? () from /lib/libcrypto.so.3
#1  0x0000020000000000 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb)

I would have expected something more...

Did you install openssl-dbg too?

Yep, it's the line before launching gdb in my previous comment.

I'm wondering if I've screwed up something when building kasts on the device: in order for the dbg symbols to be recognized, I had to remove kasts from repository and install the 3 local packages kasts, kasts-dbg and kasts-lang. Maybe I have to do the same for openssl?

No that makes no sense. kasts-lang is most definitely not required, that just installs localization files and have no code in them. kasts should've just been upgraded with a simple apk upgrade -a. Only kasts-dbg needs to be explicitly installed.

Tried building locally both kasts and openssl

oneplus-enchilada:~$ ls packages/user/aarch64/
APKINDEX.tar.gz                   openssl-3.1.4-r1.apk
kasts-23.08.3-r0.apk              openssl-dbg-3.1.4-r1.apk
kasts-dbg-23.08.3-r0.apk          openssl-dev-3.1.4-r1.apk
kasts-lang-23.08.3-r0.apk         openssl-doc-3.1.4-r1.apk
libcrypto3-3.1.4-r1.apk           openssl-libs-static-3.1.4-r1.apk
libssl3-3.1.4-r1.apk
oneplus-enchilada:~$ sudo apk add ./packages/user/aarch64/*.apk
The following NEW packages will be installed:
  breeze-icons5 kasts kasts-dbg kasts-lang kcodecs5 kcodecs5-lang kconfig5
  kconfig5-lang kcoreaddons5 kcoreaddons5-lang kde-default-icon-theme ki18n5
  ki18n5-lang kirigami-addons kirigami-addons-lang kirigami2 kirigami2-lang
  kirigami2-libs libpcre2-16 libxkbcommon-x11 libxmu libxt networkmanager-qt5
  openssl-dbg openssl-dev openssl-doc openssl-libs-static qt5-qtbase
  qt5-qtbase-sqlite qt5-qtbase-x11 qt5-qtdeclarative qt5-qtgraphicaleffects
  qt5-qtkeychain qt5-qtkeychain-lang qt5-qtmultimedia qt5-qtquickcontrols2
  qt5-qtwayland qtkeychain syndication5 threadweaver5 vlc-libs xcb-util
  xcb-util-image xcb-util-keysyms xdg-utils xprop xset
The following packages will be upgraded:
  libcrypto3 libssl3 openssl
After this operation, 304 MiB of additional disk space will be used.
Do you want to continue [Y/n]? 
(1/50) Replacing libcrypto3 (3.1.4-r1 -> 3.1.4-r1)
(2/50) Replacing libssl3 (3.1.4-r1 -> 3.1.4-r1)
(3/50) Replacing openssl (3.1.4-r1 -> 3.1.4-r1)
(4/50) Installing libpcre2-16 (10.42-r1)
(5/50) Installing qt5-qtbase (5.15.10_git20230714-r1)
(6/50) Installing libxt (1.3.0-r4)
(7/50) Installing libxmu (1.1.4-r2)
(8/50) Installing xset (1.2.5-r1)
(9/50) Installing xprop (1.2.6-r0)
(10/50) Installing xdg-utils (1.1.3-r4)
(11/50) Installing xcb-util (0.4.1-r3)
(12/50) Installing xcb-util-image (0.4.1-r0)
(13/50) Installing xcb-util-keysyms (0.4.1-r0)
(14/50) Installing libxkbcommon-x11 (1.6.0-r0)
(15/50) Installing qt5-qtbase-x11 (5.15.10_git20230714-r1)
(16/50) Installing qt5-qtdeclarative (5.15.10_git20230629-r0)
(17/50) Installing qt5-qtwayland (5.15.10_git20230714-r0)
(18/50) Installing qt5-qtgraphicaleffects (5.15.10_git20230424-r0)
(19/50) Installing qt5-qtquickcontrols2 (5.15.10_git20230612-r0)
(20/50) Installing kirigami2-libs (5.112.0-r0)
(21/50) Installing kirigami2 (5.112.0-r0)
(22/50) Installing qt5-qtmultimedia (5.15.10_git20230612-r0)
(23/50) Installing kirigami-addons (0.11.0-r1)
(24/50) Installing qt5-qtbase-sqlite (5.15.10_git20230714-r1)
(25/50) Installing kconfig5 (5.112.0-r0)
(26/50) Installing kcoreaddons5 (5.112.0-r0)
(27/50) Installing breeze-icons5 (5.112.0-r0)
(28/50) Installing kde-default-icon-theme (5.112.0-r0)
(29/50) Installing ki18n5 (5.112.0-r0)
(30/50) Installing networkmanager-qt5 (5.112.0-r0)
(31/50) Installing kcodecs5 (5.112.0-r0)
(32/50) Installing syndication5 (5.112.0-r0)
(33/50) Installing threadweaver5 (5.112.0-r0)
(34/50) Installing qtkeychain (0.14.1-r1)
(35/50) Installing qt5-qtkeychain (0.14.1-r1)
(36/50) Installing vlc-libs (3.0.20-r1)
(37/50) Installing kasts (23.08.3-r0)
(38/50) Installing kasts-dbg (23.08.3-r0)
(39/50) Installing kasts-lang (23.08.3-r0)
(40/50) Installing kirigami2-lang (5.112.0-r0)
(41/50) Installing kconfig5-lang (5.112.0-r0)
(42/50) Installing kirigami-addons-lang (0.11.0-r1)
(43/50) Installing qt5-qtkeychain-lang (0.14.1-r1)
(44/50) Installing kcoreaddons5-lang (5.112.0-r0)
(45/50) Installing kcodecs5-lang (5.112.0-r0)
(46/50) Installing ki18n5-lang (5.112.0-r0)
(47/50) Installing openssl-dbg (3.1.4-r1)
(48/50) Installing openssl-dev (3.1.4-r1)
(49/50) Installing openssl-doc (3.1.4-r1)
(50/50) Installing openssl-libs-static (3.1.4-r1)
Executing busybox-1.36.1-r15.trigger
Executing ca-certificates-20230506-r0.trigger
Executing shared-mime-info-2.4-r0.trigger
Executing gtk-update-icon-cache-3.24.38-r3.trigger
Executing desktop-file-utils-0.27-r0.trigger
OK: 2480 MiB in 984 packages
oneplus-enchilada:~$ sudo apk add gdb
The following NEW packages will be installed:
  gcc-gdb gdb musl-dbg
Need to download 6649 KiB of packages.
After this operation, 17 MiB of additional disk space will be used.
Do you want to continue [Y/n]? 
(1/3) Installing musl-dbg (1.2.4_git20230717-r4)
(2/3) Installing gdb (13.2-r3)
(3/3) Installing gcc-gdb (13.2.1_git20231014-r0)
Executing busybox-1.36.1-r15.trigger
OK: 2497 MiB in 987 packages
oneplus-enchilada:~$ gdb kasts
GNU gdb (GDB) 13.2
Copyright (C) 2023 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 "aarch64-alpine-linux-musl".
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 kasts...
Reading symbols from /usr/lib/debug//usr/bin/kasts.debug...
(gdb) run
Starting program: /usr/bin/kasts 

Program received signal SIGILL, Illegal instruction.
0x0000fffff4dae000 in ?? () from /lib/libcrypto.so.3
(gdb) bt
#0  0x0000fffff4dae000 in ?? () from /lib/libcrypto.so.3
#1  0x0000020000000000 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb) quit
A debugging session is active.

        Inferior 1 [process 1604] will be killed.

Quit anyway? (y or n) y
oneplus-enchilada:~$

I expected the error to be on the openssl side, but re-building it locally did not show anything relevant...

changed title from Kasts SIGILL with pmOS edge on op6-enchilada to community/kasts crashes on Alpine edge, SIGKILL

assigned to @PureTryOut

Adding that I'm seeing the same seg fault on my pine64-pinephone running postmarketos on both 23.12 and edge channels (including a clean install with pmbootstrap today).

@tiol11 I think the SIGILL you are seeing is a CPU capability-probing mechanism by openssl which can be ignored with a gdb option per the OpenSSL FAQ ( https://www.openssl.org/docs/faq.html ) [emphasis mine]:

When debugging I observe SIGILL during OpenSSL initialization: why?

OpenSSL adapts to processor it executes on and for this reason has to query its capabilities. Unfortunately on some processors the only way to achieve this for non-privileged code is to attempt instructions that can cause Illegal Instruction exceptions. The initialization procedure is coded to handle these exceptions to manipulate corresponding bits in capabilities vector. This normally appears transparent, except when you execute it under debugger, which stops prior delivering signal to handler. Simply resuming execution does the trick, but when debugging a lot it might feel counterproductive. Two options. Either set explicit capability environment variable in order to bypass the capability query (see corresponding crypto/*cap.c for details). Or configure debugger not to stop upon SIGILL exception, e.g. in gdb case add ‘handle SIGILL nostop’ to your .gdbinit.

Please let me know if there is any additional information or testing that would help.

mentioned in commit PureTryOut/aports@83d34509

mentioned in merge request !59570 (merged)

closed with merge request !59570 (merged)

mentioned in commit ba981fd1

mentioned in merge request !63007 (closed)

@PureTryOut Kasts seems to be broken again unless vlc gets installed, here pmOS edge so kasts-24.02.2-r0 on op6-enchilada. Maybe something got lost in the Qt5->Qt6 transition?

Hmm it does depend on it through so:libvlc.so.5. Did VLC not get installed at all or did you mean some specific subpackage? At least this should pull in vlc-libs.

Same here, I installed postmarketOS plasma-mobile v24.12 on oneplus-enchilada, installed kasts and it would crash after showing the splashscreen for a few seconds. Thanks to @tiol11 I installed vlc, and kasts works now.

community/kasts crashes on Alpine edge, SIGKILL

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