Comment # 5 on bug 1127000 from 
I added log level=10 to the smb.conf file, sent HUP to smbd and this happened
when a new zombie appeared:
> xslaby   22053  0.0  0.0      0     0 ?        Z    08:29   0:00      \_ [smbd] <defunct>


> [2019/03/01 08:27:41.975369, 10, pid=30600, effective(500, 500), real(500, 500)] ../source3/lib/util_event.c:43(smbd_idle_event_handler)
>   smbd_idle_event_handler: idle_evt(deadtime) (nil) called
> [2019/03/01 08:27:41.975580, 10, pid=30600, effective(500, 500), real(500, 500)] ../source3/lib/util_event.c:54(smbd_idle_event_handler)
>   smbd_idle_event_handler: idle_evt(deadtime) (nil) rescheduled
> [2019/03/01 08:27:41.975732, 10, pid=30600, effective(500, 500), real(500, 500)] ../source3/lib/util_event.c:43(smbd_idle_event_handler)
>   smbd_idle_event_handler: idle_evt(housekeeping) (nil) called
> [2019/03/01 08:27:41.975885,  5, pid=30600, effective(500, 500), real(500, 500)] ../source3/smbd/process.c:2898(housekeeping_fn)
>   housekeeping
> [2019/03/01 08:27:41.976026,  4, pid=30600, effective(500, 500), real(500, 500)] ../source3/smbd/sec_ctx.c:320(set_sec_ctx_internal)
>   setting sec ctx (0, 0) - sec_ctx_stack_ndx = 0
> [2019/03/01 08:27:41.976197,  5, pid=30600, effective(500, 500), real(500, 500)] ../libcli/security/security_token.c:53(security_token_debug)
>   Security token: (NULL)
> [2019/03/01 08:27:41.976333,  5, pid=30600, effective(500, 500), real(500, 500)] ../source3/auth/token_util.c:850(debug_unix_user_token)
>   UNIX token of user 0
>   Primary group is 0 and contains 0 supplementary groups
> [2019/03/01 08:27:41.976560,  5, pid=30600, effective(500, 500), real(500, 500)] ../source3/smbd/uid.c:455(smbd_change_to_root_user)
>   change_to_root_user: now uid=(500,500) gid=(500,500)
> [2019/03/01 08:27:41.976758, 10, pid=30600, effective(500, 500), real(500, 500)] ../source3/lib/util_event.c:54(smbd_idle_event_handler)
>   smbd_idle_event_handler: idle_evt(housekeeping) (nil) rescheduled
> [2019/03/01 08:28:42.035532, 10, pid=30600, effective(500, 500), real(500, 500)] ../source3/lib/util_event.c:43(smbd_idle_event_handler)
>   smbd_idle_event_handler: idle_evt(deadtime) (nil) called
> [2019/03/01 08:28:42.035742, 10, pid=30600, effective(500, 500), real(500, 500)] ../source3/lib/util_event.c:54(smbd_idle_event_handler)
>   smbd_idle_event_handler: idle_evt(deadtime) (nil) rescheduled
> [2019/03/01 08:28:42.035898, 10, pid=30600, effective(500, 500), real(500, 500)] ../source3/lib/util_event.c:43(smbd_idle_event_handler)
>   smbd_idle_event_handler: idle_evt(housekeeping) (nil) called
> [2019/03/01 08:28:42.036084,  5, pid=30600, effective(500, 500), real(500, 500)] ../source3/smbd/process.c:2898(housekeeping_fn)
>   housekeeping
> [2019/03/01 08:28:42.036318,  4, pid=30600, effective(500, 500), real(500, 500)] ../source3/smbd/sec_ctx.c:320(set_sec_ctx_internal)
>   setting sec ctx (0, 0) - sec_ctx_stack_ndx = 0
> [2019/03/01 08:28:42.036475,  5, pid=30600, effective(500, 500), real(500, 500)] ../libcli/security/security_token.c:53(security_token_debug)
>   Security token: (NULL)
> [2019/03/01 08:28:42.036618,  5, pid=30600, effective(500, 500), real(500, 500)] ../source3/auth/token_util.c:850(debug_unix_user_token)
>   UNIX token of user 0
>   Primary group is 0 and contains 0 supplementary groups
> [2019/03/01 08:28:42.036853,  5, pid=30600, effective(500, 500), real(500, 500)] ../source3/smbd/uid.c:455(smbd_change_to_root_user)
>   change_to_root_user: now uid=(500,500) gid=(500,500)
> [2019/03/01 08:28:42.037050, 10, pid=30600, effective(500, 500), real(500, 500)] ../source3/lib/util_event.c:54(smbd_idle_event_handler)
>   smbd_idle_event_handler: idle_evt(housekeeping) (nil) rescheduled
> [2019/03/01 08:29:38.817934, 10, pid=22053, effective(500, 500), real(500, 500)] ../source3/lib/messages_dgm_ref.c:175(msg_dgm_ref_destructor)
>   msg_dgm_ref_destructor: refs=(nil)
> [2019/03/01 08:29:38.819135, 10, pid=22053, effective(500, 500), real(500, 500)] ../source3/lib/messages_dgm_ref.c:92(messaging_dgm_ref)
>   messaging_dgm_ref: messaging_dgm_init returned ��sp��ch
> [2019/03/01 08:29:38.819359, 10, pid=22053, effective(500, 500), real(500, 500)] ../source3/lib/messages_dgm_ref.c:121(messaging_dgm_ref)
>   messaging_dgm_ref: unique = 9155697459312363793
> [2019/03/01 08:29:38.819605, 10, pid=22053, effective(500, 500), real(500, 500)] ../source3/lib/messages_dgm.c:1586(messaging_dgm_wipe_fn)
>   messaging_dgm_cleanup(30600) returned Prost��edek je do��asn�� nep����stupn��
> [2019/03/01 08:29:38.819742, 10, pid=22053, effective(500, 500), real(500, 500)] ../source3/lib/messages_dgm.c:1586(messaging_dgm_wipe_fn)
>   messaging_dgm_cleanup(30602) returned Prost��edek je do��asn�� nep����stupn��
> [2019/03/01 08:29:38.819866, 10, pid=22053, effective(500, 500), real(500, 500)] ../source3/lib/messages_dgm.c:1586(messaging_dgm_wipe_fn)
>   messaging_dgm_cleanup(30603) returned Prost��edek je do��asn�� nep����stupn��
> [2019/03/01 08:29:38.819964, 10, pid=22053, effective(500, 500), real(500, 500)] ../source3/lib/messages.c:1441(mess_parent_dgm_cleanup)
>   messaging_dgm_wipe returned ok
> [2019/03/01 08:29:38.820149, 10, pid=22053, effective(500, 500), real(500, 500)] ../source3/lib/messages_dgm_ref.c:175(msg_dgm_ref_destructor)
>   msg_dgm_ref_destructor: refs=(nil)
> [2019/03/01 08:29:39.062676, 10, pid=30600, effective(500, 500), real(500, 500)] ../source3/lib/util_event.c:43(smbd_idle_event_handler)
>   smbd_idle_event_handler: idle_evt(keepalive) (nil) called
> [2019/03/01 08:29:39.063132, 10, pid=30600, effective(500, 500), real(500, 500)] ../source3/lib/util_event.c:54(smbd_idle_event_handler)
>   smbd_idle_event_handler: idle_evt(keepalive) (nil) rescheduled
> [2019/03/01 08:29:42.039432, 10, pid=30600, effective(500, 500), real(500, 500)] ../source3/lib/util_event.c:43(smbd_idle_event_handler)
>   smbd_idle_event_handler: idle_evt(deadtime) (nil) called
> [2019/03/01 08:29:42.039653, 10, pid=30600, effective(500, 500), real(500, 500)] ../source3/lib/util_event.c:54(smbd_idle_event_handler)
>   smbd_idle_event_handler: idle_evt(deadtime) (nil) rescheduled
> [2019/03/01 08:29:42.039799, 10, pid=30600, effective(500, 500), real(500, 500)] ../source3/lib/util_event.c:43(smbd_idle_event_handler)
>   smbd_idle_event_handler: idle_evt(housekeeping) (nil) called
> [2019/03/01 08:29:42.039965,  5, pid=30600, effective(500, 500), real(500, 500)] ../source3/smbd/process.c:2898(housekeeping_fn)
>   housekeeping
> [2019/03/01 08:29:42.040136,  4, pid=30600, effective(500, 500), real(500, 500)] ../source3/smbd/sec_ctx.c:320(set_sec_ctx_internal)
>   setting sec ctx (0, 0) - sec_ctx_stack_ndx = 0
> [2019/03/01 08:29:42.040321,  5, pid=30600, effective(500, 500), real(500, 500)] ../libcli/security/security_token.c:53(security_token_debug)
>   Security token: (NULL)
> [2019/03/01 08:29:42.040461,  5, pid=30600, effective(500, 500), real(500, 500)] ../source3/auth/token_util.c:850(debug_unix_user_token)
>   UNIX token of user 0
>   Primary group is 0 and contains 0 supplementary groups
> [2019/03/01 08:29:42.040774,  5, pid=30600, effective(500, 500), real(500, 500)] ../source3/smbd/uid.c:455(smbd_change_to_root_user)
>   change_to_root_user: now uid=(500,500) gid=(500,500)
> [2019/03/01 08:29:42.041164,  6, pid=30600, effective(500, 500), real(500, 500)] ../source3/param/loadparm.c:2336(lp_file_list_changed)
>   lp_file_list_changed()
>   file /tmp/qemu-smb.ZIY0XZ/smb.conf -> /tmp/qemu-smb.ZIY0XZ/smb.conf  last mod_time: Fri Mar  1 08:26:57 2019
>   
> [2019/03/01 08:29:42.041492, 10, pid=30600, effective(500, 500), real(500, 500)] ../source3/lib/util_event.c:54(smbd_idle_event_handler)
>   smbd_idle_event_handler: idle_evt(housekeeping) (nil) rescheduled
> [2019/03/01 08:30:42.095497, 10, pid=30600, effective(500, 500), real(500, 500)] ../source3/lib/util_event.c:43(smbd_idle_event_handler)
>   smbd_idle_event_handler: idle_evt(deadtime) (nil) called
> [2019/03/01 08:30:42.095783, 10, pid=30600, effective(500, 500), real(500, 500)] ../source3/lib/util_event.c:54(smbd_idle_event_handler)
>   smbd_idle_event_handler: idle_evt(deadtime) (nil) rescheduled
> [2019/03/01 08:30:42.095988, 10, pid=30600, effective(500, 500), real(500, 500)] ../source3/lib/util_event.c:43(smbd_idle_event_handler)
>   smbd_idle_event_handler: idle_evt(housekeeping) (nil) called
> [2019/03/01 08:30:42.096174,  5, pid=30600, effective(500, 500), real(500, 500)] ../source3/smbd/process.c:2898(housekeeping_fn)
>   housekeeping
> [2019/03/01 08:30:42.096324,  4, pid=30600, effective(500, 500), real(500, 500)] ../source3/smbd/sec_ctx.c:320(set_sec_ctx_internal)
>   setting sec ctx (0, 0) - sec_ctx_stack_ndx = 0
> [2019/03/01 08:30:42.096478,  5, pid=30600, effective(500, 500), real(500, 500)] ../libcli/security/security_token.c:53(security_token_debug)
>   Security token: (NULL)
> [2019/03/01 08:30:42.096630,  5, pid=30600, effective(500, 500), real(500, 500)] ../source3/auth/token_util.c:850(debug_unix_user_token)
>   UNIX token of user 0
>   Primary group is 0 and contains 0 supplementary groups
> [2019/03/01 08:30:42.096855,  5, pid=30600, effective(500, 500), real(500, 500)] ../source3/smbd/uid.c:455(smbd_change_to_root_user)
>   change_to_root_user: now uid=(500,500) gid=(500,500)
> [2019/03/01 08:30:42.097039, 10, pid=30600, effective(500, 500), real(500, 500)] ../source3/lib/util_event.c:54(smbd_idle_event_handler)
>   smbd_idle_event_handler: idle_evt(housekeeping) (nil) rescheduled
>

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