Sorry for the delay, I am on GMT+2.
I removed the "loglevel 0" - but it did not make a difference. So I sudo'd myself to run strace, and here are the last lines of the command:
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sudo strace /opt/zimbra/openldap/libexec/slapd -l LOCAL0 -4 -u `whoami` -h "ldap://:389/" -f /opt/zimbra/conf/slapd.conf -d 10
*******
Output (last strace lines):
==============================
Code:
sendto(3, "<135>Dec 13 11:26:23 slapd[10615"..., 50, MSG_NOSIGNAL, NULL, 0) = 50
open("/opt/zimbra/openldap/var/run/slapd.pid", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 9
fstat(9, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2aaaab8c8000
write(9, "10615\n", 6) = 6
close(9) = 0
munmap(0x2aaaab8c8000, 4096) = 0
open("/opt/zimbra/openldap/var/run/slapd.args", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 9
fstat(9, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2aaaab8c8000
write(9, "/opt/zimbra/openldap/libexec/sla"..., 113) = 113
close(9) = 0
munmap(0x2aaaab8c8000, 4096) = 0
mmap(NULL, 610304, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2aaaab8c8000
mmap(NULL, 8392704, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|0x40, -1, 0) = 0x40000000
mprotect(0x40000000, 4096, PROT_NONE) = 0
clone(child_stack=0x40800270, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID|CLONE_DETACHED, parent_tidptr=0x408009f0, tls=0x40800960, child_tidptr=0x408009f0) = 10616
futex(0x408009f0, FUTEX_WAIT, 10616, NULLdaemon: added 6r
daemon: select: listen=6 active_threads=0 tvp=NULL ===============================
Thanks.