I've collected the instructions that are around the failures and it is 
suspicious for
 lbzx / lvx / ld
All failures are around those:

Impish

ubuntu@i-systemdtest:/var/crash$ for i in */CoreDump; do p=$(dirname $i | tr -d 
'.0123456789' | tr '_' '/' ); gdb $p $i -q -ex "x/-10i \$pc" -ex "x/3i \$pc" 
-ex "q"; done
Reading symbols from /usr/bin/chgrp...
Reading symbols from 
/usr/lib/debug/.build-id/27/193823a3e38fa68e68ecfcb8bd98b2cb41d617.debug...
[New LWP 855]
Core was generated by `/bin/chgrp adm /var/log/dmesg '.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00000e0cb28f5190 in quotearg_buffer_restyled 
(buffer=buffer@entry=0xe0cb2920130 <slot0> "'", 
buffersize=buffersize@entry=256, 
    arg=arg@entry=0x606513d00c0e0000 <error: Cannot access memory at address 
0x606513d00c0e0000>, argsize=argsize@entry=18446744073709551615, 
quoting_style=shell_always_quoting_style, 
    flags=flags@entry=1, quote_these_too=quote_these_too@entry=0x7fffd194aca0, 
left_quote=<optimized out>, right_quote=<optimized out>) at lib/quotearg.c:400
400     lib/quotearg.c: No such file or directory.
   0xe0cb28f5168 <quotearg_buffer_restyled+1256>:       cmpdi   r28,0
   0xe0cb28f516c <quotearg_buffer_restyled+1260>:       cmpdi   cr3,r22,-1
   0xe0cb28f5170 <quotearg_buffer_restyled+1264>:       addi    r9,r31,1
   0xe0cb28f5174 <quotearg_buffer_restyled+1268>:       addi    r29,r29,1
   0xe0cb28f5178 <quotearg_buffer_restyled+1272>:       cmpld   cr7,r9,r16
   0xe0cb28f517c <quotearg_buffer_restyled+1276>:       addi    r31,r9,1
   0xe0cb28f5180 <quotearg_buffer_restyled+1280>:       blt     
cr7,0xe0cb28f51b0 <quotearg_buffer_restyled+1328>
   0xe0cb28f5184 <quotearg_buffer_restyled+1284>:       bne     0xe0cb28f4eb0 
<quotearg_buffer_restyled+560>
   0xe0cb28f5188 <quotearg_buffer_restyled+1288>:       li      r24,0
   0xe0cb28f518c <quotearg_buffer_restyled+1292>:       bne     
cr3,0xe0cb28f4eb4 <quotearg_buffer_restyled+564>
=> 0xe0cb28f5190 <quotearg_buffer_restyled+1296>:       lbzx    r30,r23,r29
   0xe0cb28f5194 <quotearg_buffer_restyled+1300>:       cntlzw  r30,r30
   0xe0cb28f5198 <quotearg_buffer_restyled+1304>:       rlwinm  r30,r30,27,5,31
Reading symbols from /usr/bin/chmod...
Reading symbols from 
/usr/lib/debug/.build-id/4d/106a49cb4c9f6f8f4ab6db8ce5930efdec021e.debug...

warning: Can't open file /usr/lib/powerpc64le-linux-gnu/libc-2.31.so
during file-backed mapping note processing

warning: Can't open file /usr/lib/powerpc64le-linux-gnu/ld-2.31.so during 
file-backed mapping note processing
[New LWP 2300]
Core was generated by `chmod 0711 /var/snap/lxd/common/lxd '.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00000147684c5050 in ?? ()
No line number information available for address 0x147684c504f
=> 0x147684c5050:       lbzx    r30,r24,r29
   0x147684c5054:       cntlzw  r30,r30
   0x147684c5058:       rlwinm  r30,r30,27,5,31
Reading symbols from /usr/bin/find...
Reading symbols from 
/usr/lib/debug/.build-id/3c/c37af50368782eb631f8c451e0830803c5e669.debug...
[New LWP 3876]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/powerpc64le-linux-gnu/libthread_db.so.1".
Core was generated by `find /var/lib/update-notifier/updates-available -newermt 
now-7 days '.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  __strlen_power9 () at ../sysdeps/powerpc/powerpc64/le/power9/strlen.S:44
44      ../sysdeps/powerpc/powerpc64/le/power9/strlen.S: No such file or 
directory.
No line number information available for address 0x7b70090875bf
   0x7b70090875c0 <__strlen_power9>:    vspltisb v18,0
   0x7b70090875c4 <__strlen_power9+4>:  vspltisb v19,-1
   0x7b70090875c8 <__strlen_power9+8>:  neg     r5,r3
   0x7b70090875cc <__strlen_power9+12>: clrldi  r9,r5,60
=> 0x7b70090875d0 <__strlen_power9+16>: lvx     v0,0,r3
   0x7b70090875d4 <__strlen_power9+20>: lvsr    v1,0,r3
   0x7b70090875d8 <__strlen_power9+24>: vperm   v0,v19,v0,v1
Reading symbols from /usr/bin/rm...
Reading symbols from 
/usr/lib/debug/.build-id/57/6e94c66b0b81cf99c708ab49e3db8e9f32c036.debug...
[New LWP 3942]
Core was generated by `rm -f /var/lib/update-notifier/tmp.2y4Fd9GVp5 '.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00000798b9f361d0 in quotearg_buffer_restyled 
(buffer=buffer@entry=0x798b9f60130 <slot0> "'", 
buffersize=buffersize@entry=256, 
    arg=arg@entry=0x800369e198070000 <error: Cannot access memory at address 
0x800369e198070000>, argsize=argsize@entry=18446744073709551615, 
quoting_style=shell_always_quoting_style, 
    flags=flags@entry=1, quote_these_too=quote_these_too@entry=0x7fffcf48d7c0, 
left_quote=<optimized out>, right_quote=<optimized out>) at lib/quotearg.c:400
400     lib/quotearg.c: No such file or directory.
   0x798b9f361a8 <quotearg_buffer_restyled+1256>:       cmpdi   r28,0
   0x798b9f361ac <quotearg_buffer_restyled+1260>:       cmpdi   cr3,r22,-1
   0x798b9f361b0 <quotearg_buffer_restyled+1264>:       addi    r9,r31,1
   0x798b9f361b4 <quotearg_buffer_restyled+1268>:       addi    r29,r29,1
   0x798b9f361b8 <quotearg_buffer_restyled+1272>:       cmpld   cr7,r9,r16
   0x798b9f361bc <quotearg_buffer_restyled+1276>:       addi    r31,r9,1
   0x798b9f361c0 <quotearg_buffer_restyled+1280>:       blt     
cr7,0x798b9f361f0 <quotearg_buffer_restyled+1328>
   0x798b9f361c4 <quotearg_buffer_restyled+1284>:       bne     0x798b9f35ef0 
<quotearg_buffer_restyled+560>
   0x798b9f361c8 <quotearg_buffer_restyled+1288>:       li      r24,0
   0x798b9f361cc <quotearg_buffer_restyled+1292>:       bne     
cr3,0x798b9f35ef4 <quotearg_buffer_restyled+564>
=> 0x798b9f361d0 <quotearg_buffer_restyled+1296>:       lbzx    r30,r23,r29
   0x798b9f361d4 <quotearg_buffer_restyled+1300>:       cntlzw  r30,r30
   0x798b9f361d8 <quotearg_buffer_restyled+1304>:       rlwinm  r30,r30,27,5,31
Reading symbols from /usr/bin/rm...
Reading symbols from 
/usr/lib/debug/.build-id/57/6e94c66b0b81cf99c708ab49e3db8e9f32c036.debug...
[New LWP 4024]
Core was generated by `rm /foo '.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x000007d8753761d0 in quotearg_buffer_restyled 
(buffer=buffer@entry=0x7d8753a0130 <slot0> "'", 
buffersize=buffersize@entry=256, 
    arg=arg@entry=0x80410981d8070000 <error: Cannot access memory at address 
0x80410981d8070000>, argsize=argsize@entry=18446744073709551615, 
quoting_style=shell_always_quoting_style, 
    flags=flags@entry=1, quote_these_too=quote_these_too@entry=0x7fffef260f50, 
left_quote=<optimized out>, right_quote=<optimized out>) at lib/quotearg.c:400
400     lib/quotearg.c: No such file or directory.
   0x7d8753761a8 <quotearg_buffer_restyled+1256>:       cmpdi   r28,0
   0x7d8753761ac <quotearg_buffer_restyled+1260>:       cmpdi   cr3,r22,-1
   0x7d8753761b0 <quotearg_buffer_restyled+1264>:       addi    r9,r31,1
   0x7d8753761b4 <quotearg_buffer_restyled+1268>:       addi    r29,r29,1
   0x7d8753761b8 <quotearg_buffer_restyled+1272>:       cmpld   cr7,r9,r16
   0x7d8753761bc <quotearg_buffer_restyled+1276>:       addi    r31,r9,1
   0x7d8753761c0 <quotearg_buffer_restyled+1280>:       blt     
cr7,0x7d8753761f0 <quotearg_buffer_restyled+1328>
   0x7d8753761c4 <quotearg_buffer_restyled+1284>:       bne     0x7d875375ef0 
<quotearg_buffer_restyled+560>
   0x7d8753761c8 <quotearg_buffer_restyled+1288>:       li      r24,0
   0x7d8753761cc <quotearg_buffer_restyled+1292>:       bne     
cr3,0x7d875375ef4 <quotearg_buffer_restyled+564>
=> 0x7d8753761d0 <quotearg_buffer_restyled+1296>:       lbzx    r30,r23,r29
   0x7d8753761d4 <quotearg_buffer_restyled+1300>:       cntlzw  r30,r30
   0x7d8753761d8 <quotearg_buffer_restyled+1304>:       rlwinm  r30,r30,27,5,31
Reading symbols from /usr/bin/rm...
Reading symbols from 
/usr/lib/debug/.build-id/57/6e94c66b0b81cf99c708ab49e3db8e9f32c036.debug...
[New LWP 906]
Core was generated by `rm -rf /tmp/pollinate.tzqlorZOCM3X '.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  last_component (name=0x804170e3450d0000 <error: Cannot access memory at 
address 0x804170e3450d0000>) at lib/basename-lgpl.c:36
36      lib/basename-lgpl.c: No such file or directory.
No line number information available for address 0xd45ade2549f
=> 0xd45ade254a0 <last_component>:      lbz     r9,0(r3)
   0xd45ade254a4 <last_component+4>:    cmplwi  r9,47
   0xd45ade254a8 <last_component+8>:    bne     0xd45ade254bc 
<last_component+28>


Focal

$ for i in */CoreDump; do p=$(dirname $i | tr -d '.0123456789' | tr '_' '/' ); 
gdb $p $i -q -ex "x/-10i \$pc" -ex "x/3i \$pc" -ex "q"; done
Reading symbols from /usr/bin/find...
Reading symbols from 
/usr/lib/debug/.build-id/67/c0d4df7aff2f7c3113a270e0839de23b1942ff.debug...
[New LWP 997]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/powerpc64le-linux-gnu/libthread_db.so.1".
Core was generated by `find /var/lib/update-notifier/updates-available -newermt 
now-7 days '.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  __strlen_power8 () at ../sysdeps/powerpc/powerpc64/power8/strlen.S:36
36      ../sysdeps/powerpc/powerpc64/power8/strlen.S: No such file or directory.
No line number information available for address 0x7e0f566e1cdf
   0x7e0f566e1ce0 <__strlen_power8>:    dcbt    0,r3
   0x7e0f566e1ce4 <__strlen_power8+4>:  rldicr  r4,r3,0,60
   0x7e0f566e1ce8 <__strlen_power8+8>:  rlwinm  r6,r3,3,26,28
   0x7e0f566e1cec <__strlen_power8+12>: li      r0,0
   0x7e0f566e1cf0 <__strlen_power8+16>: li      r5,-1
=> 0x7e0f566e1cf4 <__strlen_power8+20>: ld      r12,0(r4)
   0x7e0f566e1cf8 <__strlen_power8+24>: sld     r5,r5,r6
   0x7e0f566e1cfc <__strlen_power8+28>: orc     r9,r12,r5
Reading symbols from /usr/bin/rm...
Reading symbols from 
/usr/lib/debug/.build-id/52/ef9ac8e7ffd3c14fe97d9efcd463c65318d6d7.debug...
[New LWP 1107]
Core was generated by `rm -f /var/lib/update-notifier/tmp.7RITiEiwnq '.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00000727ed5063b0 in quotearg_buffer_restyled 
(buffer=buffer@entry=0x727ed530130 <slot0> "'", 
buffersize=buffersize@entry=256, 
    arg=arg@entry=0x800314f727070000 <error: Cannot access memory at address 
0x800314f727070000>, argsize=argsize@entry=18446744073709551615, 
quoting_style=shell_always_quoting_style, 
    flags=flags@entry=1, quote_these_too=quote_these_too@entry=0x7fffdbb42770, 
left_quote=0x0, right_quote=0x0) at lib/quotearg.c:400
400     lib/quotearg.c: No such file or directory.
   0x727ed506388 <quotearg_buffer_restyled+1160>:       addi    r9,r31,1
   0x727ed50638c <quotearg_buffer_restyled+1164>:       addi    r29,r29,1
   0x727ed506390 <quotearg_buffer_restyled+1168>:       addi    r31,r31,2
   0x727ed506394 <quotearg_buffer_restyled+1172>:       cmpld   cr7,r9,r27
   0x727ed506398 <quotearg_buffer_restyled+1176>:       blt     
cr7,0x727ed506440 <quotearg_buffer_restyled+1344>
   0x727ed50639c <quotearg_buffer_restyled+1180>:       bne     0x727ed506448 
<quotearg_buffer_restyled+1352>
   0x727ed5063a0 <quotearg_buffer_restyled+1184>:       cmpdi   r22,-1
   0x727ed5063a4 <quotearg_buffer_restyled+1188>:       li      r9,0
   0x727ed5063a8 <quotearg_buffer_restyled+1192>:       std     r9,112(r1)
   0x727ed5063ac <quotearg_buffer_restyled+1196>:       bne     0x727ed5060c4 
<quotearg_buffer_restyled+452>
=> 0x727ed5063b0 <quotearg_buffer_restyled+1200>:       lbzx    r30,r24,r29
   0x727ed5063b4 <quotearg_buffer_restyled+1204>:       cntlzw  r30,r30
   0x727ed5063b8 <quotearg_buffer_restyled+1208>:       rlwinm  r30,r30,27,5,31
Reading symbols from /usr/bin/rm...
Reading symbols from 
/usr/lib/debug/.build-id/52/ef9ac8e7ffd3c14fe97d9efcd463c65318d6d7.debug...
[New LWP 838]
Core was generated by `rm -rf /tmp/pollinate.8UMuSzjLatRW '.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  last_component (name=0x8041f076230e0000 <error: Cannot access memory at 
address 0x8041f076230e0000>) at lib/basename-lgpl.c:36
36      lib/basename-lgpl.c: No such file or directory.
No line number information available for address 0xe234bc956df
=> 0xe234bc956e0 <last_component>:      lbz     r9,0(r3)
   0xe234bc956e4 <last_component+4>:    cmplwi  r9,47
   0xe234bc956e8 <last_component+8>:    bne     0xe234bc956fc 
<last_component+28>

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https://bugs.launchpad.net/bugs/1935617

Title:
  systemd autopkgtest broken on ppc64el with qemu 6.0

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