Hello Felix Rublack,
I do not know if the maintainer are able to reproduce this issue,
but instead or additional to the strace a backtrace of the crash
might help them. The easiest way might be to install systemd-coredump
and look at "journalctl -e" after a crash. More info in [1].
(Even better with debug symbols installed.)
Nevertheless the segfault lines in dmesg lead to
following locations in iris_dri.so:
mpv/vo:
function iris_resource_bo called from function stream_state:
https://sources.debian.org/src/mesa/20.0.2-1/src/gallium/drivers/iris/iris_resource.h/#L290
https://sources.debian.org/src/mesa/20.0.2-1/src/gallium/drivers/iris/iris_blorp.c/#L60
until L63
vlc:
glxgears:
function GEN9_3DSTATE_VERTEX_ELEMENTS_pack called from iris_blorp_exec:
file src/intel/genxml/gen9_pack.h, line 6901. (unfortunately a generated
file?)
maybe related to
https://sources.debian.org/src/mesa/20.0.2-1/src/intel/blorp/blorp_genX_exec.h/#L550
Kind regards,
Bernhard
[1] https://wiki.debian.org/HowToGetABacktrace
From submitter:
[ 37.001269] mpv/vo[1739]: segfault at a0 ip 7fe5d34a62a8 sp
7fe5e6092de0 error 4 in iris_dri.so[7fe5d2a8d000+d2e000]
[ 37.001276] Code: 44 24 18 48 c7 44 24 10 00 00 00 00 48 c7 44 24 18 00 00
00 00 50 4c 8d 4c 24 18 e8 e2 a4 b6 ff 48 8b 44 24 18 31 d2 48 89 ef <4c> 8b b0
a0 00 00 00 4c 89 f6 e8 09 94 fd ff 48 8b bd 28 01 00 00
[ 46.41] vlc[1778]: segfault at 24 ip 7fcc272a4c06 sp
7fcbf9e01c50 error 6 in iris_dri.so[7fcc2688b000+d2e000]
[ 46.420006] Code: 7e 30 44 01 ff 81 ff ff ff 00 00 0f 87 ab 17 00 00 49 01
c7 4c 89 7e 38 48 85 c0 0f 84 2c 02 00 00 83 ea 01 81 ca 00 00 09 78 <89> 10 48
8d 50 04 45 85 ed 74 74 41 8d 75 ff 48 8d 74 f0 0c 66 0f
[ 57.343120] glxgears[1785]: segfault at 24 ip 7f4a1467ec06 sp
7ffd2389b2f0 error 6 in iris_dri.so[7f4a13c65000+d2e000]
[ 57.343126] Code: 7e 30 44 01 ff 81 ff ff ff 00 00 0f 87 ab 17 00 00 49 01
c7 4c 89 7e 38 48 85 c0 0f 84 2c 02 00 00 83 ea 01 81 ca 00 00 09 78 <89> 10 48
8d 50 04 45 85 ed 74 74 41 8d 75 ff 48 8d 74 f0 0c 66 0f
https://wiki.debian.org/InterpretingKernelOutputAtProcessCrash
"error 4" == 0: no page found, 0: read access, 1: user-mode access
"error 6" == 0: no page found, 1: write access, 1: user-mode access
echo -n "find /b ..., ..., 0x" && \
> echo "44 24 18 48 c7 44 24 10 00 00 00 00 48 c7 44 24 18 00 00 00 00 50 4c 8d
> 4c 24 18 e8 e2 a4 b6 ff 48 8b 44 24 18 31 d2 48 89 ef <4c> 8b b0 a0 00 00 00
> 4c 89 f6 e8 09 94 fd ff 48 8b bd 28 01 00 00" \
> | sed 's/[<>]//g' | sed 's/ /, 0x/g'
find /b ..., ..., 0x44, 0x24, 0x18, 0x48, 0xc7, 0x44, 0x24, 0x10, 0x00, 0x00,
0x00, 0x00, 0x48, 0xc7, 0x44, 0x24, 0x18, 0x00, 0x00, 0x00, 0x00, 0x50, 0x4c,
0x8d, 0x4c, 0x24, 0x18, 0xe8, 0xe2, 0xa4, 0xb6, 0xff, 0x48, 0x8b, 0x44, 0x24,
0x18, 0x31, 0xd2, 0x48, 0x89, 0xef, 0x4c, 0x8b, 0xb0, 0xa0, 0x00, 0x00, 0x00,
0x4c, 0x89, 0xf6, 0xe8, 0x09, 0x94, 0xfd, 0xff, 0x48, 0x8b, 0xbd, 0x28, 0x01,
0x00, 0x00
$ echo -n "find /b ..., ..., 0x" && \
> echo "7e 30 44 01 ff 81 ff ff ff 00 00 0f 87 ab 17 00 00 49 01 c7 4c 89 7e 38
> 48 85 c0 0f 84 2c 02 00 00 83 ea 01 81 ca 00 00 09 78 <89> 10 48 8d 50 04 45
> 85 ed 74 74 41 8d 75 ff 48 8d 74 f0 0c 66 0f" \
> | sed 's/[<>]//g' | sed 's/ /, 0x/g'
find /b ..., ..., 0x7e, 0x30, 0x44, 0x01, 0xff, 0x81, 0xff, 0xff, 0xff, 0x00,
0x00, 0x0f, 0x87, 0xab, 0x17, 0x00, 0x00, 0x49, 0x01, 0xc7, 0x4c, 0x89, 0x7e,
0x38, 0x48, 0x85, 0xc0, 0x0f, 0x84, 0x2c, 0x02, 0x00, 0x00, 0x83, 0xea, 0x01,
0x81, 0xca, 0x00, 0x00, 0x09, 0x78, 0x89, 0x10, 0x48, 0x8d, 0x50, 0x04, 0x45,
0x85, 0xed, 0x74, 0x74, 0x41, 0x8d, 0x75, 0xff, 0x48, 0x8d, 0x74, 0xf0, 0x0c,
0x66, 0x0f
# Unstable amd64 qemu VM 2020-04-04
apt update
apt dist-upgrade
apt install systemd-coredump sddm xserver-xorg openbox xterm gdb mesa-utils
mesa-utils-dbgsym libgl1-mesa-dri-dbgsym
gdb -q
set width 0
set pagination off
file /usr/bin/glxgears
b main
set environment LD_PRELOAD=/usr/lib/x86_64-linux-gnu/dri/iris_dri.so
run
dele 1
info share
find ...
b * (... + 42)
info b
$ gdb -q
(gdb) set width 0
(gdb) set pagination off
(gdb) file /usr/bin/glxgears
Reading symbols from /usr/bin/glxgears...
Reading symbols from
/usr/lib/debug/.build-id/40/dc623a2c150d26c9229676fba7f45a49aed7d7.debug...
(gdb) b main
Breakpoint 1 at 0x2410: file glxgears.c, line 723.
(gdb) set environment LD_PRELOAD=/usr/lib/x86_64-linux-gnu/dri/iris_dri.so
(gdb) run
Starting program: /usr/bin/glxgears
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Breakpoint 1, main (argc=1, argv=0x7fffe608) at glxgears.c:723
723 glxgears.c: Datei oder Verzeichnis nicht gefunden.
(gdb) dele 1
(gdb) info share
FromTo Syms Read Shared Object Library
...
0x76a5e010 0x77788b1e Yes
/usr/lib/x86_64-linux-gnu/dri/iris_dri.so
...
(*): Shared library is missing
