xz crashed with SIGSEGV in lzma_lzma_optimum_normal

xz segfaults. More details in
https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/2032379

From Dmesg.txt on that report

[114838.184191] xz[431483]: segfault at 7f9a93f3701a ip 00007f9b3f780c1a sp 00007f9a957baa50 error 4 in liblzma.so.5.2.5[7f9b3f771000+1b000]

ProblemType: Crash
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: unknown
DistroRelease: Ubuntu 22.04
ExecutablePath: /usr/bin/xz
ExecutableTimestamp: 1649422298
InstallationDate: Installed on 2021-04-09 (863 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
Package: xz-utils 5.2.5-2ubuntu1
ProcCmdline: xz --check=crc32 --threads=0 -c /var/tmp/mkinitramfs-MAIN_E1GbD9
ProcCwd: /
ProcEnviron:
 LC_CTYPE=C.UTF-8
 TERM=linux
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
ProcVersionSignature: Ubuntu 5.19.0-38.39~22.04.1-generic 5.19.17
SegvAnalysis:
 Segfault happened at: 0x7f9b3f780c1a: movzbl (%rdi,%r8,1),%r10d
 PC (0x7f9b3f780c1a) ok
 source "(%rdi,%r8,1)" (0x7f9a93f3701a) in non-readable VMA region: 0x7f9a90021000-0x7f9a94000000 ---p None
 destination "%r10d" ok
 Stack memory exhausted (SP below stack segment)
SegvReason: reading VMA None
Signal: 11
SourcePackage: xz-utils
Uname: Linux 5.19.0-38-generic x86_64
UpgradeStatus: Upgraded to jammy on 2023-01-29 (204 days ago)
UserGroups: N/A
StacktraceTop:
 bt_find_func (len_limit=64, pos=9137198, cur=0x7f9a943edc3d "", cur_match=4194304, depth=24, son=son@entry=0x7f9a8afbd010, cyclic_pos=748589, cyclic_size=8388609, matches=0x7f9adc0ec324, len_best=11) at ../../../../src/liblzma/lz/lz_encoder_mf.c:483
 lzma_mf_bt4_find (mf=0x7f9a90000c70, matches=0x7f9adc0ec304) at ../../../../src/liblzma/lz/lz_encoder_mf.c:721
 lzma_mf_find (mf=mf@entry=0x7f9a90000c70, count_ptr=count_ptr@entry=0x7f9adc0ecb94, matches=matches@entry=0x7f9adc0ec304) at ../../../../src/liblzma/lz/lz_encoder_mf.c:28
 lzma_lzma_optimum_normal (position=<optimized out>, len_res=<synthetic pointer>, back_res=<synthetic pointer>, mf=<optimized out>, coder=<optimized out>) at ../../../../src/liblzma/lzma/lzma_encoder_optimum_normal.c:846
 lzma_lzma_optimum_normal (position=<optimized out>, len_res=<synthetic pointer>, back_res=<synthetic pointer>, mf=<optimized out>, coder=<optimized out>) at ../../../../src/liblzma/lzma/lzma_encoder_optimum_normal.c:804