Je viens de regarder. J'ai filtré un peu et ce qui me semble correspondre c'est ça :
sept. 02 13:08:56 eeepc.localdomain systemd[1]: Created slice system-systemd\x2dcoredump.slice.
sept. 02 13:08:56 eeepc.localdomain audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=systemd-coredump@0-2563-0 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
sept. 02 13:08:56 eeepc.localdomain systemd[1]: Started Process Core Dump (PID 2563/UID 0).
sept. 02 13:09:15 eeepc.localdomain systemd-coredump[2564]: Process 2542 (soffice.bin) of user 1000 dumped core.
Stack trace of thread 2542:
#0 0x00000000a8796c95 _ZL16_expand_stack_toPh (libjvm.so)
#1 0x00000000a879975b _ZN2os5Linux21manually_expand_stackEP10JavaThreadPh (libjvm.so)
#2 0x00000000a87a5d37 _ZN2os18create_main_threadEP10JavaThread (libjvm.so)
#3 0x00000000a890a2d5 _ZN7Threads9create_vmEP14JavaVMInitArgsPb (libjvm.so)
#4 0x00000000a8562d15 JNI_CreateJavaVM (libjvm.so)
#5 0x00000000b15fb66e _Z34jfw_plugin_startJavaVirtualMachinePK8JavaInfoPK12JavaVMOptionlPP7JavaVM_PP7JNIEnv_ (libjvmfwklo.so)
#6 0x00000000b160d5fd _Z11jfw_startVMPK8JavaInfoP12JavaVMOptionlPP7JavaVM_PP7JNIEnv_ (libjvmfwklo.so)
#7 0x00000000a901860a _ZN11stoc_javavm18JavaVirtualMachine9getJavaVMERKN3com3sun4star3uno8SequenceIaEE (libjavavmlo.so)
#8 0x00000000a903b7e8 _ZN15stoc_javaloader19JavaComponentLoader13getJavaLoaderEv (libjavaloaderlo.so)
#9 0x00000000a903d1b7 _ZN15stoc_javaloader19JavaComponentLoader17writeRegistryInfoERKN3com3sun4star3uno9ReferenceINS3_8registry12XRegistryKeyEEERKN3rtl8OUStringESE_ (libjavaloaderlo.so)
#10 0x00000000a906472d _ZN12_GLOBAL__N_126ImplementationRegistration10doRegisterERKN3com3sun4star3uno9ReferenceINS3_4lang22XMultiComponentFactoryEEERKNS5_INS4_17XComponentContextEEERKNS5_INS3_6loader21XImplementationLoaderEEERKNS5_INS3_8registry15XSimpleRegistryEEERKN3rtl8OUStringESS_SS_ (libbootstraplo.so)
#11 0x00000000a9066c1e _ZN12_GLOBAL__N_126ImplementationRegistration15prepareRegisterERKN3rtl8OUStringES4_S4_RKN3com3sun4star3uno9ReferenceINS7_8registry15XSimpleRegistryEEE (libbootstraplo.so)
#12 0x00000000a9538313 _ZN11dp_registry7backend9component12_GLOBAL__N_111BackendImpl20ComponentPackageImpl15processPackage_ERN3osl15ResettableGuardINS5_5MutexEEEbbRKN3rtl9ReferenceIN7dp_misc12AbortChannelEEERKN3com3sun4star3uno9ReferenceINSJ_3ucb19XCommandEnvironmentEEE (libdeployment.so)
#13 0x00000000a9559ecf _ZN11dp_registry7backend7Package19processPackage_implEbbRKN3com3sun4star3uno9ReferenceINS4_4task13XAbortChannelEEERKNS6_INS4_3ucb19XCommandEnvironmentEEE (libdeployment.so)
#14 0x00000000a955a6ff _ZN11dp_registry7backend7Package15registerPackageEhRKN3com3sun4star3uno9ReferenceINS4_4task13XAbortChannelEEERKNS6_INS4_3ucb19XCommandEnvironmentEEE (libdeployment.so)
#15 0x00000000a95845cb _ZN11dp_registry7backend6bundle12_GLOBAL__N_111BackendImpl11PackageImpl15processPackage_ERN3osl15ResettableGuardINS5_5MutexEEEbbRKN3rtl9ReferenceIN7dp_misc12AbortChannelEEERKN3com3sun4star3uno9ReferenceINSJ_3ucb19XCommandEnvironmentEEE (libdeployment.so)
#16 0x00000000a9559ecf _ZN11dp_registry7backend7Package19processPackage_implEbbRKN3com3sun4star3uno9ReferenceINS4_4task13XAbortChannelEEERKNS6_INS4_3ucb19XCommandEnvironmentEEE (libdeployment.so)
#17 0x00000000a955a6ff _ZN11dp_registry7backend7Package15registerPackageEhRKN3com3sun4star3uno9ReferenceINS4_4task13XAbortChannelEEERKNS6_INS4_3ucb19XCommandEnvironmentEEE (libdeployment.so)
#18 0x00000000a9506846 _ZN10dp_manager16ExtensionManager17activateExtensionERKN3com3sun4star3uno8SequenceINS4_9ReferenceINS3_10deployment8XPackageEEEEEbbRKNS6_INS3_4task13XAbortChannelEEERKNS6_INS3_3ucb19XCommandEnvironmentEEE (libdeployment.so)
#19 0x00000000a9508ea2 _ZN10dp_manager16ExtensionManager11synchronizeERKN3com3sun4star3uno9ReferenceINS3_4task13XAbortChannelEEERKNS5_INS3_3ucb19XCommandEnvironmentEEE (libdeployment.so)
#20 0x00000000b67ba27a _ZN7dp_misc16syncRepositoriesEbRKN3com3sun4star3uno9ReferenceINS2_3ucb19XCommandEnvironmentEEE (libdeploymentmisclo.so)
#21 0x00000000b764b7d5 _ZN7desktop7Desktop32SynchronizeExtensionRepositoriesEv (libsofficeapp.so)
#22 0x00000000b763d802 _ZN7desktop7Desktop4MainEv (libsofficeapp.so)
#23 0x00000000b42c92b2 _Z10ImplSVMainv (libvcllo.so)
#24 0x00000000b42c93e9 _Z6SVMainv (libvcllo.so)
#25 0x00000000b7673d35 soffice_main (libsofficeapp.so)
#26 0x00000000004e35cc main (soffice.bin)
#27 0x00000000b746b2c3 __libc_start_main (libc.so.6)
#28 0x00000000004e360f _start (soffice.bin)
sept. 02 13:09:15 eeepc.localdomain audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=systemd-coredump@0-2563-0 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
sept. 02 13:09:17 eeepc.localdomain abrt-dump-journal-core[713]: Échec de l'obtention de toutes les informations nécessaires de journald
Je ne sais pas si ça peut aider...
Edit :
En cherchant un peu plus, je suis tombé sur ce sujet :
https://bugzilla.redhat.com/show_bug.cgi?id=1468436
En regardant les commentaires, j'ai vu qu'en enlevant libreoffice-writer2latex (que je n'ai pas utilisé depuis 10 ans) pouvait résoudre le problème. Et effectivement , maintenant, ça marche. Apparemment, c'est un problème entre java et les derniers noyaux i686.