ndo2db segfault

[Antoine Musso]

Hello,

We have a segfault with ndo2db when sending large chunk of perfdata. I 
tracked the problem either with a tcp or an unix socket.

The usual backtrace, hopefully there is enough informations:

nagios at host$ ulimit -c 50000
nagios at host$ /opt/nagios/bin/ndo2db -c /opt/nagios/etc/ndo2db.cfg

Waiting a bit and launching gdb on the generated core

nagios at host$ gdb /opt/nagios/bin/ndo2db --core core.5964
<snip gdb header>
Core was generated by `/opt/nagios/bin/ndo2db -c 
/opt/nagios/etc/ndo2db.cfg'.
Program terminated with signal 11, Segmentation fault.
<snip symbols>
#0  0x0000003490e59564 in __find_specmb () from /lib64/tls/libc.so.6
(gdb) thread apply all bt full

Thread 1 (process 5174):
#0  0x0000003490e59564 in __find_specmb () from /lib64/tls/libc.so.6
No symbol table info available.
#1  0x0000003490e3f8f2 in vfprintf () from /lib64/tls/libc.so.6
No symbol table info available.
#2  0x0000003490e62496 in vasprintf () from /lib64/tls/libc.so.6
No symbol table info available.
#3  0x0000003490e487c6 in asprintf () from /lib64/tls/libc.so.6
No symbol table info available.
#4  0x00000000004105de in ndo2db_db_hello (idi=0x7fbffff100) at db.c:294
	buf = Variable "buf" is not available.
(gdb)


This is the system call trace on ndo2db listening on tcp 127.0.0.1 :

# strace -f -p 16316
Process 16316 attached - interrupt to quit
accept(4, {sa_family=AF_INET, sin_port=htons(57169), 
sin_addr=inet_addr("127.0.0.1")}, [4294967312]) = 5
clone(Process 9942 attached
child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, 
child_tidptr=0x2a9556e090) = 9942
[pid 16316] close(5)                    = 0
[pid 16316] accept(4,  <unfinished ...>
[pid  9942] close(3)                    = 0
[pid  9942] open("/tmp/ndo2db.debug", O_RDWR|O_CREAT|O_APPEND, 0666) = 3
[pid  9942] rt_sigaction(SIGQUIT, {0x402930, [QUIT], 
SA_RESTORER|SA_RESTART, 0x3490e2e2f0}, {0x402900, [QUIT], 
SA_RESTORER|SA_RESTART, 0x3490e2e2f0}, 8) = 0
[pid  9942] rt_sigaction(SIGTERM, {0x402930, [TERM], 
SA_RESTORER|SA_RESTART, 0x3490e2e2f0}, {0x402900, [TERM], 
SA_RESTORER|SA_RESTART, 0x3490e2e2f0}, 8) = 0
[pid  9942] rt_sigaction(SIGINT, {0x402930, [INT], 
SA_RESTORER|SA_RESTART, 0x3490e2e2f0}, {0x402900, [INT], 
SA_RESTORER|SA_RESTART, 0x3490e2e2f0}, 8) = 0
[pid  9942] rt_sigaction(SIGSEGV, {0x402930, [SEGV], 
SA_RESTORER|SA_RESTART, 0x3490e2e2f0}, {0x402900, [SEGV], 
SA_RESTORER|SA_RESTART, 0x3490e2e2f0}, 8) = 0
[pid  9942] rt_sigaction(SIGFPE, {0x402930, [FPE], 
SA_RESTORER|SA_RESTART, 0x3490e2e2f0}, {0x402900, [FPE], 
SA_RESTORER|SA_RESTART, 0x3490e2e2f0}, 8) = 0
[pid  9942] read(5, "\n\nHELLO\nPROTOCOL: 2\nAGENT: NDOMO"..., 511) = 511
[pid  9942] brk(0x55b000)               = 0x55b000
[pid  9942] brk(0x57c000)               = 0x57c000
[pid  9942] brk(0x59d000)               = 0x59d000
[pid  9942] brk(0x5be000)               = 0x5be000
[pid  9942] brk(0x5df000)               = 0x5df000
[pid  9942] brk(0x600000)               = 0x600000
[pid  9942] brk(0x621000)               = 0x621000
[pid  9942] brk(0x642000)               = 0x642000
[pid  9942] brk(0x663000)               = 0x663000
[pid  9942] brk(0x684000)               = 0x684000
<snip>
[pid  9942] brk(0xec4000)               = 0xec4000
[pid  9942] brk(0xee5000)               = 0xee5000
[pid  9942] brk(0xf06000)               = 0xf06000
[pid  9942] brk(0xf27000)               = 0xf27000
[pid  9942] brk(0xf48000)               = 0xf48000
[pid  9942] brk(0xf69000)               = 0xf69000
[pid  9942] brk(0xf8a000)               = 0xf8a000
[pid  9942] brk(0xfab000)               = 0xfab000
[pid  9942] --- SIGSEGV (Segmentation fault) @ 0 (0) ---
[pid  9942] --- SIGSEGV (Segmentation fault) @ 0 (0) ---
Process 9942 detached
<... accept resumed> 0x7fbffff7b0, [4294967312]) = ? ERESTARTSYS (To be 
restarted)
--- SIGCHLD (Child exited) @ 0 (0) ---
wait4(-1, NULL, WNOHANG, NULL)          = 9942
rt_sigreturn(0xffffffffffffffff)        = 43
accept(4,  <unfinished ...>
Process 16316 detached


Our configuration :

Linux Redhat Enterprise 5
ndoutils 1.4b7
nagios 3.0.3

ldd ndo2db give us :

   libz.so.1.2.1.2
   libnsl-2.3.4.so
   libmysqlclient.so.14.0.0
   libm-2.3.4.so
   libc-2.3.4.so
   libcrypt-2.3.4.so
   libssl.so.0.9.7a
   libcrypto.so.0.9.7a
   libgssapi_krb5.so.2.2
   libkrb5.so.3.2
   libcom_err.so.2.1
   libk5crypto.so.3.0
   libresolv-2.3.4.so
   libdl-2.3.4.so
   /lib64/ld-linux-x86-64.so.2



-- 
Antoine MUSSO
DISIT/PROD/QFO/OUT
mailto:antoine.musso at laposte.fr
tél. 02 40 12 73 62
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