Description of problem:
we can see a crash in directry with this stacktrace:
#0 0x00007f748a9c1373 in PR_Write (fd=0x55683c42e4e0, buf=0x7f742b404bd0, amount=107) at ../../../nspr/pr/src/io/priometh.c:114
#1 0x000055683a6458a5 in slapi_write_buffer (fd=<optimized out>, buf=<optimized out>, amount=<optimized out>) at ldap/servers/slapd/fileio.c:48
#2 0x00007f748ca6c66b in vslapd_log_emergency_error (fp=0x55683c42e4e0, msg=0x7f748cade1a8 "Insufficent buffer capacity to fit timestamp and message!", locked=0) at ldap/servers/slapd/log.c:2260
#3 0x00007f748ca73779 in vslapd_log_access (fmt=fmt@entry=0x7f748cadf994 "conn=%lu op=%d MOD dn=\"%s\"%s\n", ap=ap@entry=0x7f742b4064a0) at ldap/servers/slapd/log.c:2535
#4 0x00007f748ca74971 in slapi_log_access (level=level@entry=256, fmt=fmt@entry=0x7f748cadf994 "conn=%lu op=%d MOD dn=\"%s\"%s\n") at ldap/servers/slapd/log.c:2568
#5 0x00007f748ca7c15f in op_shared_modify (pb=pb@entry=0x55683f960ea0, pw_change=pw_change@entry=0, old_pw=0x0) at ldap/servers/slapd/modify.c:668
#6 0x00007f748ca7e05b in do_modify (pb=pb@entry=0x55683f960ea0) at ldap/servers/slapd/modify.c:391
#7 0x000055683a63d2ee in connection_dispatch_operation (pb=0x55683f960ea0, op=0x55685ff5aa80, conn=0x55683e872780) at ldap/servers/slapd/connection.c:625
#8 0x000055683a63d2ee in connection_threadmain () at ldap/servers/slapd/connection.c:1785
#9 0x00007f748a9db9bb in _pt_root (arg=0x55683f95ed00) at ../../../nspr/pr/src/pthreads/ptthread.c:216
#10 0x00007f748a37be25 in start_thread (arg=0x7f742b407700) at pthread_create.c:396
#11 0x00007f7489c5d34d in lsetxattr () at ../sysdeps/unix/syscall-template.S:81
#12 0x0000000000000000 in None ()
Version-Release number of selected component (if applicable): 389-ds-base-18.104.22.168-24.el7_5.x86_64
How reproducible: not easily.
Created attachment 1475048 [details]
core_backtrace of the coredump
Created attachment 1475049 [details]
I can not reproduce the issue. I can get the error to be logged by adding an entry with a really large DN:
[17/Aug/2018:15:56:33.905658222 -0400] - EMERG - Insufficent buffer capacity to fit timestamp and message!
But no crash. The core dump shows the error log FD is corrupted and trying to write to it fails, but I don't know how that happened. I think this is a case where we need valgrind or an ASAN build to make any progress on this.
Build tested: 389-ds-base-22.214.171.124-12.el7.x86_64
Reproducer from https://bugzilla.redhat.com/show_bug.cgi?id=1614820#c7 no longer crashes the server, error messages are formatted correctly:
[30/Aug/2018:12:59:44.570829721 +0000] - EMERG - Insufficent buffer capacity to fit timestamp and message!
[30/Aug/2018:12:59:44.593972036 +0000] - EMERG - Insufficent buffer capacity to fit timestamp and message!
[30/Aug/2018:12:59:44.610915031 +0000] - EMERG - Insufficent buffer capacity to fit timestamp and message!
Marking as VERIFIED.
*** Bug 1623721 has been marked as a duplicate of this bug. ***
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.