It took quite a long this time. The system was running over a week. I got a log of the crash and all other services were running normal (except for sshd and systemd of course) for another ~30h until i rebootet it. I looks like sshd crashed first and systemd followed while adding a restart job. debsums reported no errors of sshd. No idea why it segfaulted.
Jun 21 19:38:44 Storage-Blue systemd[1]: Received SIGCHLD from PID 942 (sshd).
Jun 21 19:38:44 Storage-Blue systemd[1]: Child 942 (sshd) died (code=killed,
status=11/SEGV)
Jun 21 19:38:44 Storage-Blue systemd[1]: Child 942 belongs to ssh.service
Jun 21 19:38:44 Storage-Blue systemd[1]: ssh.service: main process exited,
code=killed, status=11/SEGV
Jun 21 19:38:44 Storage-Blue systemd[1]: ssh.service changed running -> failed
Jun 21 19:38:44 Storage-Blue systemd[1]: Unit ssh.service entered failed state.
Jun 21 19:38:44 Storage-Blue systemd[1]: ssh.service changed failed ->
auto-restart
Jun 21 19:38:44 Storage-Blue systemd[1]: ssh.service: cgroup is empty
Jun 21 19:38:44 Storage-Blue systemd[1]: Sent message type=signal sender=n/a
destination=n/a object=/org/freedesktop/systemd1/unit/ssh_2eservice
interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=4205
reply_cookie=0 error=n/a
Jun 21 19:38:44 Storage-Blue systemd[1]: Sent message type=signal sender=n/a
destination=n/a object=/org/freedesktop/systemd1/unit/ssh_2eservice
interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=4206
reply_cookie=0 error=n/a
Jun 21 19:38:44 Storage-Blue systemd[1]: Accepted new private connection.
Jun 21 19:38:44 Storage-Blue systemd[1]: Got message type=signal sender=n/a
destination=n/a object=/org/freedesktop/systemd1/agent
interface=org.freedesktop.systemd1.Agent member=Released cookie=1
reply_cookie=0 error=n/a
Jun 21 19:38:44 Storage-Blue systemd[1]: Sent message type=signal sender=n/a
destination=n/a object=/org/freedesktop/systemd1/agent
interface=org.freedesktop.systemd1.Agent member=Released cookie=1
reply_cookie=0 error=n/a
Jun 21 19:38:44 Storage-Blue systemd[1]: Got disconnect on private connection.
Jun 21 19:38:45 Storage-Blue systemd[1]: ssh.service holdoff time over,
scheduling restart.
Jun 21 19:38:45 Storage-Blue systemd[1]: Trying to enqueue job
ssh.service/restart/fail
Jun 21 19:38:45 Storage-Blue systemd[1]: Caught <SEGV>, dumped core as pid 7185.
Jun 21 19:38:45 Storage-Blue systemd[1]: Freezing execution.
Jun 21 20:14:26 Storage-Blue dhclient: DHCPREQUEST on eth0 to 192.168.100.1
port 67
Jun 21 20:14:26 Storage-Blue dhclient: DHCPACK from 192.168.100.1
Jun 21 20:14:52 Storage-Blue dbus[951]: [system] Failed to activate service
'org.freedesktop.systemd1': timed out
Jun 21 20:14:52 Storage-Blue dhclient: bound to 192.168.100.2 -- renewal in
32545 seconds.
$ ls -la /core
-rw------- 1 root root 1847296 Jun 21 19:38 /core
$ sudo gdb /lib/systemd/systemd /core
GNU gdb (Debian 7.7.1+dfsg-5) 7.7.1
[...]
Core was generated by `/lib/systemd/systemd --system --deserialize 16'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0xb6dd7198 in raise (sig=11) at
../nptl/sysdeps/unix/sysv/linux/pt-raise.c:37
37 ../nptl/sysdeps/unix/sysv/linux/pt-raise.c: No such file or directory.
(gdb) bt
#0 0xb6dd7198 in raise (sig=11) at
../nptl/sysdeps/unix/sysv/linux/pt-raise.c:37
#1 0xb6e368f0 in crash.lto_priv.245 (sig=11) at ../src/core/main.c:158
#2 <signal handler called>
#3 hashmap_iterate (h=0xb6b0c944, i=i@entry=0xbef391ec, key=key@entry=0x0) at
../src/shared/hashmap.c:704
#4 0xb6e954b4 in set_iterate (s=<optimized out>, i=i@entry=0xbef391ec) at
../src/shared/set.c:91
#5 0xb6ed6c74 in transaction_add_job_and_dependencies (tr=tr@entry=0xb7f07cf0,
type=type@entry=JOB_START, unit=unit@entry=0xb7ef7d78,
by=by@entry=0xb7e73c08, matters=matters@entry=false,
override=override@entry=false, conflicts=conflicts@entry=false,
ignore_requirements=ignore_requirements@entry=false,
ignore_order=ignore_order@entry=false, e=e@entry=0xbef394b8)
at ../src/core/transaction.c:982
#6 0xb6ed6d04 in transaction_add_job_and_dependencies (tr=tr@entry=0xb7f07cf0,
type=type@entry=JOB_START, unit=unit@entry=0xb7ed5358,
by=by@entry=0xb7e73ba8, matters=matters@entry=false,
override=override@entry=false, conflicts=conflicts@entry=false,
ignore_requirements=ignore_requirements@entry=false,
ignore_order=ignore_order@entry=false, e=e@entry=0xbef394b8)
at ../src/core/transaction.c:983
#7 0xb6ed6d04 in transaction_add_job_and_dependencies (tr=tr@entry=0xb7f07cf0,
type=type@entry=JOB_START, unit=<optimized out>,
by=by@entry=0xb7ebf2b0, matters=matters@entry=true,
override=override@entry=false, conflicts=conflicts@entry=false,
ignore_requirements=ignore_requirements@entry=false,
ignore_order=ignore_order@entry=false, e=e@entry=0xbef394b8)
at ../src/core/transaction.c:983
#8 0xb6ed68e8 in transaction_add_job_and_dependencies (tr=tr@entry=0xb7f07cf0,
type=type@entry=JOB_START, unit=<optimized out>,
by=by@entry=0xb7ebf250, matters=matters@entry=true,
override=override@entry=false, conflicts=conflicts@entry=false,
ignore_requirements=ignore_requirements@entry=false,
ignore_order=ignore_order@entry=false, e=e@entry=0xbef394b8)
at ../src/core/transaction.c:949
#9 0xb6ed68e8 in transaction_add_job_and_dependencies (tr=tr@entry=0xb7f07cf0,
type=JOB_START, unit=unit@entry=0x1, by=by@entry=0x0,
matters=matters@entry=true, override=false, override@entry=224,
conflicts=conflicts@entry=false,
ignore_requirements=ignore_requirements@entry=false,
ignore_order=ignore_order@entry=false, e=e@entry=0xbef394b8)
at ../src/core/transaction.c:949
#10 0xb6eedd34 in manager_add_job (m=0xb7e6d770, type=-1208995624,
type@entry=JOB_RESTART, unit=0x1, unit@entry=0xb7f03880,
mode=mode@entry=JOB_FAIL, override=override@entry=false,
e=e@entry=0xbef394b8, _ret=_ret@entry=0x0) at ../src/core/manager.c:1209
#11 0xb6ebb348 in service_enter_restart (s=0xb7f03880) at
../src/core/service.c:1448
#12 service_dispatch_timer.lto_priv.908 (source=<optimized out>,
usec=<optimized out>, userdata=0xb7f03880) at ../src/core/service.c:2541
#13 0xb6e44d38 in source_dispatch (s=0xb7f0fd88) at
../src/libsystemd/sd-event/sd-event.c:2024
#14 0xb6e4a400 in sd_event_run (e=0xb7e6da58, timeout=<optimized out>) at
../src/libsystemd/sd-event/sd-event.c:2314
#15 0xb6e33394 in manager_loop (m=0xb7e6d770) at ../src/core/manager.c:2009
#16 main (argc=4, argv=0xbef39e54) at ../src/core/main.c:1743
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