php - Webapp creates file with strange Group Name -


i'm having trouble website/application setting strange group names new files.

whenever create new file website (a log file, txt file, anything) sets user webapp (correctly), group name 4294967295

if use terminal ssh instance , try data on user doesn't return anything. example,

$ sudo groups 4294967295 groups: 4294967295: no such user

further, can't add mystery group of other users.

this making things difficult because have run cron jobs different user , let them both write same log (so both must share group).

i recognize it's strange (and maybe meaningful) 4294967295 highest number 1 can reach 32 bits.

any ideas or suggestions? don't have extensive linux background , haven't had luck searching answers.

i'm using amazon aws , ec2-instance.

thanks.

additional info:

how'd group name?

ls -l -rwxrwxr-x 1 webapp 4294967295  8347 apr 16 17:35 log_2013-04-16.txt  groups 4294967295 groups: 4294967295: no such user

additional info #2:

$ file /bin/ls /bin/ls: elf 64-bit lsb executable, x86-64, version 1 (sysv), dynamically linked (uses shared libs), gnu/linux 2.6.18, buildid[sha1]=0x083f0a5a25fb311dae23412bcc79f384a865e7d4, stripped  $ groups webapp webapp : webapp ec2-user

additional info #3:

$ cat group root:x:0: bin:x:1:bin,daemon daemon:x:2:bin,daemon sys:x:3:bin,adm adm:x:4:adm,daemon tty:x:5: disk:x:6: lp:x:7:daemon mem:x:8: kmem:x:9: wheel:x:10:ec2-user mail:x:12:mail uucp:x:14: man:x:15: games:x:20: gopher:x:30: video:x:39: dip:x:40: ftp:x:50: lock:x:54: audio:x:63: nobody:x:99: users:x:100: utmp:x:22: utempter:x:35: cdrom:x:11: tape:x:33: dialout:x:18: floppy:x:19: ec2-user:x:500:webapp saslauth:x:76: mailnull:x:47: smmsp:x:51: ssh_keys:x:499: ntp:x:38: sshd:x:74: tcpdump:x:72: screen:x:84: dbus:x:81: webapp:x:501:ec2-user apache:x:48:

first, using groups cmd wrong way. use like:

groups webapp_user

and give groups webapp_user belongs to.

i expect fact group name set 2^32 display problem or retrieve group name wrong way. can explain how 2^32? source code?


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