echo module creating zombies

[steffo76 at gmx.de]

Hello list,

I have a problem regarding the echo module which on my system creates zombie processes. I am using the following settings for echo:

wait = no
program = "/bin/true" (just for testing purposes)
packet_type = Access-Accept

After echo execs the program in question there is an undead child process left behind:

13467 ?        Ssl    0:00 /usr/local/freeradius/sbin/radiusd
14258 ?        Z      0:00  \_ [true] <defunct>

This is pretty much everything strace has to say:

14258 execve("/bin/true", ["/bin/true", "asdf"], [/* 6 vars */]) = 0
14258 brk(0)                            = 0x85c6000
14258 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7787000
14258 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
14258 open("/etc/ld.so.cache", O_RDONLY) = 3
14258 fstat64(3, {st_mode=S_IFREG|0644, st_size=67227, ...}) = 0
14258 mmap2(NULL, 67227, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7776000
14258 close(3)                          = 0
14258 open("/lib/i686/libc.so.6", O_RDONLY) = 3
14258 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\0h\1\0004\0\0\0\320\366\24\0\0\0\0\0004\0 \0\n\0(\0D\0C\0\6\0\0\0004\0\0\0004\0\0\0004\0\0\0@\1\0\0@\1\0\0\5\0\0\0\4\0\0\0\3\0\0\0`z\23\0`z\23\0`z\23\0\23\0\0\0\23\0\0\0\4\0\0\0\1\0\0\0\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0P\272\24\0P\272\24\0\5\0\0\0\0\20\0\0\1\0\0\0\344\301\24\0\344\301\24\0\344\301\24\0\230'\0\0lT\0\0\6\0\0\0\0\20\0\0\2\0\0\0|\335\24\0|\335\24\0|\335\24\0\360\0\0\0\360\0\0\0\6\0\0\0\4\0\0\0\4\0\0\0t\1\0\0t\1\0\0t\1\0\0 \0\0\0 \0\0\0\4\0\0\0\4\0\0\0\7\0\0\0\344\301\24\0\344\301\24\0\344\301\24\0\10\0\0\0@\0\0\0\4\0\0\0\4\0\0\0P\345tdtz\23\0tz\23\0tz\23\0\314+\0\0\314+\0\0\4\0\0\0\4\0\0\0Q\345td\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\6\0\0\0\4\0\0\0R\345td\344\301\24\0\344\301\24\0\344\301\24\0\34\36\0\0\34\36\0\0\4\0\0\0\1\0\0\0\4\0\0\0\20\0\0\0\1\0\0\0GNU\0\0\0\0\0\2\0\0\0\6\0\0\0\t\0\0\0\363\3\0\0\t\0\0\0\0\2\0\0\16\0\0\0\2400\20D\200 \2\1\214\3\346\220AE\210\0\204\0\10\0A\200\0@\300\200\0\f\2\f\0!
 \0010\0\10@\"\10\246\4\210H6l\240\0260\0&\204\200\216\4\10B$\2\f\246\244\32\6c\310\0\302 \1\300\0R\0!\201\10\4\n  \250\24\0\24(`\0\0P\240\312DB", 512) = 512
14258 fstat64(3, {st_mode=S_IFREG|0755, st_size=1376624, ...}) = 0
14258 mmap2(NULL, 1381968, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xb7624000
14258 mmap2(0xb7770000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x14c) = 0xb7770000
14258 mmap2(0xb7773000, 9808, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb7773000
14258 close(3)                          = 0
14258 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7623000
14258 set_thread_area({entry_number:-1 -> 6, base_addr:0xb76236c0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0
14258 mprotect(0xb7770000, 8192, PROT_READ) = 0
14258 mprotect(0x804f000, 4096, PROT_READ) = 0
14258 mprotect(0xb77a3000, 4096, PROT_READ) = 0
14258 munmap(0xb7776000, 67227)         = 0
14258 brk(0)                            = 0x85c6000
14258 brk(0x85e7000)                    = 0x85e7000
14258 close(1)                          = 0
14258 close(2)                          = 0
14258 exit_group(0)                     = ?

Any ideas why the zombies occur ?

Thanks
Stephan