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Bug #7295

closed

slapd core dumps on 1TB RAM

Added by Janos Mattyasovszky over 5 years ago. Updated over 5 years ago.

Status:
Released
Priority:
N/A
Category:
Server components
Target version:
Severity:
User visibility:
Effort required:
Priority:

Description

When starting slapd on a system with 1TB of RAM, it writes a coredump due a memory allocation issue.

OS: SLES11 SP3
Package: rudder-inventory-ldap-2.11.15.release-1.SLES.11
Memory: 1033740 Megabytes

++ sed -n '/^MemTotal/s/[^0-9]//gp' /proc/meminfo
+ MEMSIZE=1058549824
+ CACHESIZE=135490000
+ sed -ie '/^[ \t]*\(cachesize\|idlcachesize\)/d' /opt/rudder/etc/openldap/slapd.conf
+ sed -ie 's/^\([ \t]*suffix[ \t]\+"cn=rudder-configuration".*\)/\1\ncachesize 135490000/' /opt/rudder/etc/openldap/slapd.conf
+ sed -ie 's/^\([ \t]*suffix[ \t]\+"cn=rudder-configuration".*\)/\1\nidlcachesize 406470000/' /opt/rudder/etc/openldap/slapd.conf
[...]
56262153 ch_calloc of 1 elems of 18446744010302859784 bytes failed
slapd: ch_malloc.c:107: ch_calloc: Assertion `0' failed.
/etc/init.d/rudder-slapd: line 359: 58757 Aborted                 (core dumped) $SLAPD_BIN -h "$SLAPD_SERVICES" $SLAPD_PARAMS -d 1

Here is the backtrace from the core:

gdb -batch -ex bt /opt/rudder/libexec/slapd core.slapd.58757 bt
[...]
Core was generated by `/opt/rudder/libexec/slapd -h ldap://127.0.0.1:389 -n rudder-slapd -f /opt/rudde'.
Program terminated with signal 6, Aborted.
#0  0x00007fb98f48a885 in raise () from /lib64/libc.so.6
#0  0x00007fb98f48a885 in raise () from /lib64/libc.so.6
#1  0x00007fb98f48be61 in abort () from /lib64/libc.so.6
#2  0x00007fb98f483740 in __assert_fail () from /lib64/libc.so.6
#3  0x000000000044fc2c in ch_calloc ()
#4  0x000000000043dfa6 in attr_prealloc ()
#5  0x00007fb98cf551df in hdb_db_open (be=0x893400, cr=0x7ffd055011f0) at init.c:536
#6  0x0000000000443f7f in backend_startup_one ()
#7  0x000000000044428b in backend_startup ()
#8  0x000000000041a850 in main ()

When starting the slapd with RUDDER_CACHESIZE="noauto" and removing the cachesize-tunings from the slapd config, then it starts.

Doing an strace on the slapd WITH memory tuning:

21745 mmap(NULL, 35921920, PROT_READ|PROT_WRITE, MAP_SHARED, 9, 0) = 0x7f1a4673b000
21745 mmap(NULL, 32768, PROT_READ|PROT_WRITE, MAP_SHARED, 9, 0) = 0x7f1a46733000
21745 mmap(NULL, 3145728, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1a46433000
21745 mmap(NULL, 10839203840, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f17c0621000
21745 mmap(NULL, 18446744010302861312, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = -1 ENOMEM (Cannot allocate memory)
21745 mmap(NULL, 18446744010302996480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = -1 ENOMEM (Cannot allocate memory)
21745 mmap(NULL, 134217728, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, -1, 0) = 0x7f17b8621000
21745 mmap(NULL, 18446744010302861312, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = -1 ENOMEM (Cannot allocate memory)
21745 --- SIGABRT (Aborted) @ 0 (0) ---
21745 +++ killed by SIGABRT (core dumped) +++

When removing all memory tuning, it shows smaller values:

29764 mmap(NULL, 35921920, PROT_READ|PROT_WRITE, MAP_SHARED, 9, 0) = 0x7f4a511a3000
29764 mmap(NULL, 32768, PROT_READ|PROT_WRITE, MAP_SHARED, 9, 0) = 0x7f4a57813000
29764 mmap(NULL, 24576, PROT_READ|PROT_WRITE, MAP_SHARED, 10, 0) = 0x7f4a578d8000
29764 mmap(NULL, 66019328, PROT_READ|PROT_WRITE, MAP_SHARED, 9, 0) = 0x7f4a4f4ef000
29764 mmap(NULL, 1073741824, PROT_READ|PROT_WRITE, MAP_SHARED, 9, 0) = 0x7f4a0f4ef000
29764 mmap(NULL, 2359296, PROT_READ|PROT_WRITE, MAP_SHARED, 9, 0) = 0x7f4a0f2af000
29764 mmap(NULL, 35921920, PROT_READ|PROT_WRITE, MAP_SHARED, 9, 0) = 0x7f4a0d06d000
29764 mmap(NULL, 32768, PROT_READ|PROT_WRITE, MAP_SHARED, 9, 0) = 0x7f4a0d065000
29764 mmap(NULL, 3145728, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f4a0cd65000
29764 mmap(NULL, 8392704, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f4a0c864000
29765 mmap(NULL, 8392704, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f4a0c063000

Somehow the calculated memory size does somehow not fit for slapd on a system that big, as it tries to allocate 18.4 exabytes (10^10) of RAM :-D :-D :-D


Related issues

Related to Rudder - Bug #5965: LDAP configuration is not optimized for Rudder use caseReleasedMatthieu CERDA2015-01-08Actions
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