[Bug 2137253] Re: package libc6 2.42-0ubuntu3 failed to install/upgrade: new libc6:s390x package post-removal script subprocess was killed by signal (Illegal instruction), core dumped
Simon Poirier
2137253 at bugs.launchpad.net
Mon Jan 5 18:29:25 UTC 2026
>From the changelog of the latest gcc upload:
https://launchpad.net/ubuntu/+source/gcc-15/15.2.0-5ubuntu1
* For Ubuntu 26.04 LTS s390x, bump the baseline to z15.
Not a glibc bug, but looks still valid for the release-upgrader
** Changed in: glibc (Ubuntu)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/2137253
Title:
package libc6 2.42-0ubuntu3 failed to install/upgrade: new libc6:s390x
package post-removal script subprocess was killed by signal (Illegal
instruction), core dumped
Status in glibc package in Ubuntu:
Won't Fix
Status in ubuntu-release-upgrader package in Ubuntu:
New
Bug description:
When trying to run do-release-upgrade on a s390x VM from Questing to
Resolute, I encountered this error:
dpkg: trying script from the new package instead ...
dpkg: error processing archive /var/cache/apt/archives/libc6_2.42-2ubuntu2_s390x.deb (--unpack):
new libc6:s390x package post-removal script subprocess was killed by signal (Illegal instruction), core dumped
Illegal instruction (core dumped)
dpkg: error while cleaning up:
installed libc6:s390x package pre-installation script subprocess was killed by signal (Illegal instruction), core dumped
Selecting previously unselected package libc-gconv-modules-extra:s390x.
Preparing to unpack .../libc-gconv-modules-extra_2.42-2ubuntu2_s390x.deb ...
Unpacking libc-gconv-modules-extra:s390x (2.42-2ubuntu2) ...
Replacing files in old package libc6:s390x (2.42-0ubuntu3) ...
Errors were encountered while processing:
/var/cache/apt/archives/libc6_2.42-2ubuntu2_s390x.deb
packages have been installed but needrestart is suspended
packages have been installed but needrestart is suspended
Exception during pm.DoInstall(): E:Sub-process /usr/bin/dpkg returned an error code (1)
from dmesg:
[ 164.892923] User process fault: interruption code 0001 ilc:2 in ld64.so.1[1b9da,3ff87400000+2d000]
[ 164.892947] CPU: 1 UID: 0 PID: 3382 Comm: libc6:s390x.pos Not tainted 6.17.0-8-generic #8-Ubuntu VOLUNTARY
[ 164.892952] Hardware name: IBM 2964 N63 400 (z/VM 6.4.0)
[ 164.892954] User PSW : 0705000180000000 000003ff8741b9da
[ 164.892957] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:1 AS:0 CC:0 PM:0 RI:0 EA:3
[ 164.892962] User GPRS: 000003ff87400350 000003ff87400af8 0000000000000000 000007ff0e800af8
[ 164.892965] 0000000000000013 000003ff8742fdf0 000003ff87400cc0 000007ff0e800350
[ 164.892967] 000003ff87400000 000003ff8742fc40 000003ff87400cc0 0000000000000039
[ 164.892969] 000003ff9aeaefa8 000003ffdb3f7708 000003ff87400af8 000003ffdb3f7638
[ 164.892977] User Code: 000003ff8741b9ce: b90800ae agr %r10,%r14
000003ff8741b9d2: a7210004 tmll %r2,4
#000003ff8741b9d6: b9e30727 selgr %r2,%r7,%r0,7
>000003ff8741b9da: e320f0a00024 stg %r2,160(%r15)
000003ff8741b9e0: ecea0013a065 clgrj %r14,%r10,10,000003ff8741ba06
000003ff8741b9e6: e390e0000004 lg %r9,0(%r14)
000003ff8741b9ec: b9040038 lgr %r3,%r8
000003ff8741b9f0: e330e0100008 ag %r3,16(%r14)
[ 164.892998] Last Breaking-Event-Address:
[ 164.892999] [<000003ff8741b932>] ld64.so.1[1b932,3ff87400000+2d000]
[ 164.893343] User process fault: interruption code 0001 ilc:2 in ld64.so.1[1b9da,3ff8af00000+2d000]
[ 164.893353] CPU: 2 UID: 0 PID: 3383 Comm: apport Not tainted 6.17.0-8-generic #8-Ubuntu VOLUNTARY
[ 164.893357] Hardware name: IBM 2964 N63 400 (z/VM 6.4.0)
[ 164.893359] User PSW : 0705000180000000 000003ff8af1b9da
[ 164.893363] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:1 AS:0 CC:0 PM:0 RI:0 EA:3
[ 164.893367] User GPRS: 000003ff8af00350 000003ff8af00af8 0000000000000000 000007ff15e00af8
[ 164.893370] 0000000000000013 000003ff8af2fdf0 000003ff8af00cc0 000007ff15e00350
[ 164.893373] 000003ff8af00000 000003ff8af2fc40 000003ff8af00cc0 0000000000000039
[ 164.893375] 0000000000000000 000003ffd2378b98 000003ff8af00af8 000003ffd2378ac8
[ 164.893381] User Code: 000003ff8af1b9ce: b90800ae agr %r10,%r14
000003ff8af1b9d2: a7210004 tmll %r2,4
#000003ff8af1b9d6: b9e30727 selgr %r2,%r7,%r0,7
>000003ff8af1b9da: e320f0a00024 stg %r2,160(%r15)
000003ff8af1b9e0: ecea0013a065 clgrj %r14,%r10,10,000003ff8af1ba06
000003ff8af1b9e6: e390e0000004 lg %r9,0(%r14)
000003ff8af1b9ec: b9040038 lgr %r3,%r8
000003ff8af1b9f0: e330e0100008 ag %r3,16(%r14)
[ 164.893402] Last Breaking-Event-Address:
[ 164.893404] [<000003ff8af1b932>] ld64.so.1[1b932,3ff8af00000+2d000]
[ 164.893418] coredump: 3383(apport): RLIMIT_CORE is set to 1, aborting core
[ 164.895684] User process fault: interruption code 0001 ilc:2 in ld64.so.1[1b9da,3ffba500000+2d000]
[ 164.895698] CPU: 3 UID: 0 PID: 3384 Comm: postrm Not tainted 6.17.0-8-generic #8-Ubuntu VOLUNTARY
[ 164.895703] Hardware name: IBM 2964 N63 400 (z/VM 6.4.0)
[ 164.895705] User PSW : 0705000180000000 000003ffba51b9da
[ 164.895708] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:1 AS:0 CC:0 PM:0 RI:0 EA:3
[ 164.895713] User GPRS: 000003ffba500350 000003ffba500af8 0000000000000000 000007ff74a00af8
[ 164.895716] 0000000000000013 000003ffba52fdf0 000003ffba500cc0 000007ff74a00350
[ 164.895718] 000003ffba500000 000003ffba52fc40 000003ffba500cc0 0000000000000039
[ 164.895720] 000003ff9aeaefa8 000003ffdf7770b8 000003ffba500af8 000003ffdf776fe8
[ 164.895727] User Code: 000003ffba51b9ce: b90800ae agr %r10,%r14
000003ffba51b9d2: a7210004 tmll %r2,4
#000003ffba51b9d6: b9e30727 selgr %r2,%r7,%r0,7
>000003ffba51b9da: e320f0a00024 stg %r2,160(%r15)
000003ffba51b9e0: ecea0013a065 clgrj %r14,%r10,10,000003ffba51ba06
000003ffba51b9e6: e390e0000004 lg %r9,0(%r14)
000003ffba51b9ec: b9040038 lgr %r3,%r8
000003ffba51b9f0: e330e0100008 ag %r3,16(%r14)
[ 164.895754] Last Breaking-Event-Address:
[ 164.895756] [<000003ffba51b932>] ld64.so.1[1b932,3ffba500000+2d000]
[ 164.896015] User process fault: interruption code 0001 ilc:2 in ld64.so.1[1b9da,3ff8e200000+2d000]
[ 164.896025] CPU: 4 UID: 0 PID: 3385 Comm: apport Not tainted 6.17.0-8-generic #8-Ubuntu VOLUNTARY
[ 164.896029] Hardware name: IBM 2964 N63 400 (z/VM 6.4.0)
[ 164.896031] User PSW : 0705000180000000 000003ff8e21b9da
[ 164.896034] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:1 AS:0 CC:0 PM:0 RI:0 EA:3
[ 164.896038] User GPRS: 000003ff8e200350 000003ff8e200af8 0000000000000000 000007ff1c400af8
[ 164.896041] 0000000000000013 000003ff8e22fdf0 000003ff8e200cc0 000007ff1c400350
[ 164.896044] 000003ff8e200000 000003ff8e22fc40 000003ff8e200cc0 0000000000000039
[ 164.896046] 0000000000000000 000003ffd5b78778 000003ff8e200af8 000003ffd5b786a8
[ 164.896052] User Code: 000003ff8e21b9ce: b90800ae agr %r10,%r14
000003ff8e21b9d2: a7210004 tmll %r2,4
#000003ff8e21b9d6: b9e30727 selgr %r2,%r7,%r0,7
>000003ff8e21b9da: e320f0a00024 stg %r2,160(%r15)
000003ff8e21b9e0: ecea0013a065 clgrj %r14,%r10,10,000003ff8e21ba06
000003ff8e21b9e6: e390e0000004 lg %r9,0(%r14)
000003ff8e21b9ec: b9040038 lgr %r3,%r8
000003ff8e21b9f0: e330e0100008 ag %r3,16(%r14)
[ 164.896074] Last Breaking-Event-Address:
[ 164.896076] [<000003ff8e21b932>] ld64.so.1[1b932,3ff8e200000+2d000]
[ 164.896101] coredump: 3385(apport): RLIMIT_CORE is set to 1, aborting core
[ 164.896683] User process fault: interruption code 0001 ilc:2 in ld64.so.1[1b9da,3ffabd00000+2d000]
[ 164.896696] CPU: 2 UID: 0 PID: 3386 Comm: touch Not tainted 6.17.0-8-generic #8-Ubuntu VOLUNTARY
[ 164.896700] Hardware name: IBM 2964 N63 400 (z/VM 6.4.0)
[ 164.896702] User PSW : 0705000180000000 000003ffabd1b9da
[ 164.896705] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:1 AS:0 CC:0 PM:0 RI:0 EA:3
[ 164.896710] User GPRS: 000003ffabd00350 000003ffabd00af8 0000000000000000 000007ff57a00af8
[ 164.896712] 0000000000000013 000003ffabd2fdf0 000003ffabd00cc0 000007ff57a00350
[ 164.896715] 000003ffabd00000 000003ffabd2fc40 000003ffabd00cc0 0000000000000039
[ 164.896717] 000003ffa29aefa8 000003fff80f6df8 000003ffabd00af8 000003fff80f6d28
[ 164.896723] User Code: 000003ffabd1b9ce: b90800ae agr %r10,%r14
000003ffabd1b9d2: a7210004 tmll %r2,4
#000003ffabd1b9d6: b9e30727 selgr %r2,%r7,%r0,7
>000003ffabd1b9da: e320f0a00024 stg %r2,160(%r15)
000003ffabd1b9e0: ecea0013a065 clgrj %r14,%r10,10,000003ffabd1ba06
000003ffabd1b9e6: e390e0000004 lg %r9,0(%r14)
000003ffabd1b9ec: b9040038 lgr %r3,%r8
000003ffabd1b9f0: e330e0100008 ag %r3,16(%r14)
[ 164.896743] Last Breaking-Event-Address:
[ 164.896744] [<000003ffabd1b932>] ld64.so.1[1b932,3ffabd00000+2d000]
[ 164.896967] User process fault: interruption code 0001 ilc:2 in ld64.so.1[1b9da,3ffac400000+2d000]
[ 164.896977] CPU: 4 UID: 0 PID: 3387 Comm: apport Not tainted 6.17.0-8-generic #8-Ubuntu VOLUNTARY
[ 164.896981] Hardware name: IBM 2964 N63 400 (z/VM 6.4.0)
[ 164.896983] User PSW : 0705000180000000 000003ffac41b9da
[ 164.896986] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:1 AS:0 CC:0 PM:0 RI:0 EA:3
[ 164.896991] User GPRS: 000003ffac400350 000003ffac400af8 0000000000000000 000007ff58800af8
[ 164.896993] 0000000000000013 000003ffac42fdf0 000003ffac400cc0 000007ff58800350
[ 164.896996] 000003ffac400000 000003ffac42fc40 000003ffac400cc0 0000000000000039
[ 164.896998] 0000000000000000 000003ffd1d781b8 000003ffac400af8 000003ffd1d780e8
[ 164.897004] User Code: 000003ffac41b9ce: b90800ae agr %r10,%r14
000003ffac41b9d2: a7210004 tmll %r2,4
#000003ffac41b9d6: b9e30727 selgr %r2,%r7,%r0,7
>000003ffac41b9da: e320f0a00024 stg %r2,160(%r15)
000003ffac41b9e0: ecea0013a065 clgrj %r14,%r10,10,000003ffac41ba06
000003ffac41b9e6: e390e0000004 lg %r9,0(%r14)
000003ffac41b9ec: b9040038 lgr %r3,%r8
000003ffac41b9f0: e330e0100008 ag %r3,16(%r14)
[ 164.897025] Last Breaking-Event-Address:
[ 164.897027] [<000003ffac41b932>] ld64.so.1[1b932,3ffac400000+2d000]
[ 164.897043] coredump: 3387(apport): RLIMIT_CORE is set to 1, aborting core
[ 164.898251] User process fault: interruption code 0001 ilc:2 in ld64.so.1[1b9da,3ffb4580000+2d000]
[ 164.898261] CPU: 4 UID: 0 PID: 3389 Comm: sh Not tainted 6.17.0-8-generic #8-Ubuntu VOLUNTARY
[ 164.898265] Hardware name: IBM 2964 N63 400 (z/VM 6.4.0)
[ 164.898268] User PSW : 0705000180000000 000003ffb459b9da
[ 164.898271] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:1 AS:0 CC:0 PM:0 RI:0 EA:3
[ 164.898276] User GPRS: 000003ffb4580350 000003ffb4580af8 0000000000000000 000007ff68b00af8
[ 164.898279] 0000000000000013 000003ffb45afdf0 000003ffb4580cc0 000007ff68b00350
[ 164.898281] 000003ffb4580000 000003ffb45afc40 000003ffb4580cc0 0000000000000039
[ 164.898284] 000003ffac063b70 000003ffcbe776b8 000003ffb4580af8 000003ffcbe775e8
[ 164.898290] User Code: 000003ffb459b9ce: b90800ae agr %r10,%r14
000003ffb459b9d2: a7210004 tmll %r2,4
#000003ffb459b9d6: b9e30727 selgr %r2,%r7,%r0,7
>000003ffb459b9da: e320f0a00024 stg %r2,160(%r15)
000003ffb459b9e0: ecea0013a065 clgrj %r14,%r10,10,000003ffb459ba06
000003ffb459b9e6: e390e0000004 lg %r9,0(%r14)
000003ffb459b9ec: b9040038 lgr %r3,%r8
000003ffb459b9f0: e330e0100008 ag %r3,16(%r14)
[ 164.898312] Last Breaking-Event-Address:
[ 164.898313] [<000003ffb459b932>] ld64.so.1[1b932,3ffb4580000+2d000]
[ 164.898552] User process fault: interruption code 0001 ilc:2 in ld64.so.1[1b9da,3ffb0780000+2d000]
[ 164.898563] CPU: 0 UID: 0 PID: 3390 Comm: apport Not tainted 6.17.0-8-generic #8-Ubuntu VOLUNTARY
[ 164.898567] Hardware name: IBM 2964 N63 400 (z/VM 6.4.0)
[ 164.898569] User PSW : 0705000180000000 000003ffb079b9da
[ 164.898572] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:1 AS:0 CC:0 PM:0 RI:0 EA:3
[ 164.898577] User GPRS: 000003ffb0780350 000003ffb0780af8 0000000000000000 000007ff60f00af8
[ 164.898579] 0000000000000013 000003ffb07afdf0 000003ffb0780cc0 000007ff60f00350
[ 164.898582] 000003ffb0780000 000003ffb07afc40 000003ffb0780cc0 0000000000000039
[ 164.898584] 0000000000000000 000003ffed2f80c8 000003ffb0780af8 000003ffed2f7ff8
[ 164.898590] User Code: 000003ffb079b9ce: b90800ae agr %r10,%r14
000003ffb079b9d2: a7210004 tmll %r2,4
#000003ffb079b9d6: b9e30727 selgr %r2,%r7,%r0,7
>000003ffb079b9da: e320f0a00024 stg %r2,160(%r15)
000003ffb079b9e0: ecea0013a065 clgrj %r14,%r10,10,000003ffb079ba06
000003ffb079b9e6: e390e0000004 lg %r9,0(%r14)
000003ffb079b9ec: b9040038 lgr %r3,%r8
000003ffb079b9f0: e330e0100008 ag %r3,16(%r14)
[ 164.898610] Last Breaking-Event-Address:
[ 164.898611] [<000003ffb079b932>] ld64.so.1[1b932,3ffb0780000+2d000]
[ 164.898625] coredump: 3390(apport): RLIMIT_CORE is set to 1, aborting core
[ 164.898999] User process fault: interruption code 0001 ilc:2 in ld64.so.1[1b9da,3ff8e680000+2d000]
[ 164.899010] CPU: 7 UID: 0 PID: 3392 Comm: sh Not tainted 6.17.0-8-generic #8-Ubuntu VOLUNTARY
[ 164.899014] Hardware name: IBM 2964 N63 400 (z/VM 6.4.0)
[ 164.899016] User PSW : 0705000180000000 000003ff8e69b9da
[ 164.899019] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:1 AS:0 CC:0 PM:0 RI:0 EA:3
[ 164.899023] User GPRS: 000003ff8e680350 000003ff8e680af8 0000000000000000 000007ff1cd00af8
[ 164.899026] 0000000000000013 000003ff8e6afdf0 000003ff8e680cc0 000007ff1cd00350
[ 164.899028] 000003ff8e680000 000003ff8e6afc40 000003ff8e680cc0 0000000000000039
[ 164.899030] 000003ffac063b70 000003ffc2176ed8 000003ff8e680af8 000003ffc2176e08
[ 164.899036] User Code: 000003ff8e69b9ce: b90800ae agr %r10,%r14
000003ff8e69b9d2: a7210004 tmll %r2,4
#000003ff8e69b9d6: b9e30727 selgr %r2,%r7,%r0,7
>000003ff8e69b9da: e320f0a00024 stg %r2,160(%r15)
000003ff8e69b9e0: ecea0013a065 clgrj %r14,%r10,10,000003ff8e69ba06
000003ff8e69b9e6: e390e0000004 lg %r9,0(%r14)
000003ff8e69b9ec: b9040038 lgr %r3,%r8
000003ff8e69b9f0: e330e0100008 ag %r3,16(%r14)
[ 164.899056] Last Breaking-Event-Address:
[ 164.899057] [<000003ff8e69b932>] ld64.so.1[1b932,3ff8e680000+2d000]
[ 164.899268] User process fault: interruption code 0001 ilc:2 in ld64.so.1[1b9da,3ffa0d00000+2d000]
[ 164.899278] CPU: 0 UID: 0 PID: 3393 Comm: apport Not tainted 6.17.0-8-generic #8-Ubuntu VOLUNTARY
[ 164.899281] Hardware name: IBM 2964 N63 400 (z/VM 6.4.0)
[ 164.899283] User PSW : 0705000180000000 000003ffa0d1b9da
[ 164.899286] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:1 AS:0 CC:0 PM:0 RI:0 EA:3
[ 164.899291] User GPRS: 000003ffa0d00350 000003ffa0d00af8 0000000000000000 000007ff41a00af8
[ 164.899293] 0000000000000013 000003ffa0d2fdf0 000003ffa0d00cc0 000007ff41a00350
[ 164.899296] 000003ffa0d00000 000003ffa0d2fc40 000003ffa0d00cc0 0000000000000039
[ 164.899298] 0000000000000000 000003ffe1a78188 000003ffa0d00af8 000003ffe1a780b8
[ 164.899303] User Code: 000003ffa0d1b9ce: b90800ae agr %r10,%r14
000003ffa0d1b9d2: a7210004 tmll %r2,4
#000003ffa0d1b9d6: b9e30727 selgr %r2,%r7,%r0,7
>000003ffa0d1b9da: e320f0a00024 stg %r2,160(%r15)
000003ffa0d1b9e0: ecea0013a065 clgrj %r14,%r10,10,000003ffa0d1ba06
000003ffa0d1b9e6: e390e0000004 lg %r9,0(%r14)
000003ffa0d1b9ec: b9040038 lgr %r3,%r8
000003ffa0d1b9f0: e330e0100008 ag %r3,16(%r14)
[ 164.899323] Last Breaking-Event-Address:
[ 164.899325] [<000003ffa0d1b932>] ld64.so.1[1b932,3ffa0d00000+2d000]
[ 164.899336] coredump: 3393(apport): RLIMIT_CORE is set to 1, aborting core
[ 164.905770] coredump: 3405(apport): RLIMIT_CORE is set to 1, aborting core
[ 164.906535] coredump: 3406(apport): RLIMIT_CORE is set to 1, aborting core
Gemini suggests it's an architecture difference (z13 vs. newer
version) on the "selgr" instruction that belongs to Miscellaneous-
Instruction-Extensions Facility 3.
From this table it looks like this is for Z15-
https://www.ibm.com/docs/en/hla-and-tf/1.6.0?topic=instructions-table-all-supported
I am not sure if this is expected.
To revert this I have to:
1. Manually install the libc-bin_2.42-0ubuntu3_s390x.deb libc-dev-bin_2.42-0ubuntu3_s390x.deb
2. run sudo apt install --fix-broken to remove the broken libc-gconv-modules-extra
3. Manually install the libc6_2.42-0ubuntu3_s390x.deb
ProblemType: Package
DistroRelease: Ubuntu 25.10
Package: libc6 2.42-0ubuntu3
ProcVersionSignature: Ubuntu 6.17.0-8.8-generic 6.17.2
Uname: Linux 6.17.0-8-generic s390x
ApportVersion: 2.33.1-0ubuntu3
Architecture: s390x
CasperMD5CheckResult: pass
CloudArchitecture: s390x
CloudID: none
CloudName: none
CloudPlatform: none
CloudSubPlatform: config
Date: Tue Dec 30 09:08:01 2025
Dependencies:
gcc-15-base 15.2.0-4ubuntu4
libc6 2.42-0ubuntu3
libgcc-s1 15.2.0-4ubuntu4
libidn2-0 2.3.8-4
libunistring5 1.3-2
Df:
Dmesg:
ErrorMessage: new libc6:s390x package post-removal script subprocess was killed by signal (Illegal instruction), core dumped
InstallationDate: Installed on 2021-10-19 (1533 days ago)
InstallationMedia: Ubuntu-Server 21.10 "Impish Indri" - Release s390x (20211013)
Python3Details: /usr/bin/python3.13, Python 3.13.7, python3-minimal, 3.13.7-1
PythonDetails: N/A
RelatedPackageVersions:
dpkg 1.22.21ubuntu3.1
apt 3.1.6ubuntu2
SourcePackage: glibc
Title: package libc6 2.42-0ubuntu3 failed to install/upgrade: new libc6:s390x package post-removal script subprocess was killed by signal (Illegal instruction), core dumped
UpgradeStatus: Upgraded to questing on 2025-12-30 (0 days ago)
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