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

Waiting a bit and launching gdb on the generated core

nagios@host$ gdb /opt/nagios/bin/ndo2db --core core.5964

Core was generated by `/opt/nagios/bin/ndo2db -c
/opt/nagios/etc/ndo2db.cfg'.
Program terminated with signal 11, Segmentation fault.

#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,
[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

[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
0x7fbffff7b0, [4294967312]) = ? ERESTARTSYS (To be
restarted)
--- SIGCHLD (Child exited) @ 0 (0) ---
wait4(-1, NULL, WNOHANG, NULL) = 9942
rt_sigreturn(0xffffffffffffffff) = 43
accept(4,

...[email truncated]...


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