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I'm getting a segmentation fault when I try to run a simple "ps aux" for a certain user. If I run as root or another user it runs well. So I think is something related with ulimits, but I think that those parameters are enough:

bash-4.1$ ulimit -aS core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 128516 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 16384 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 256 cpu time (seconds, -t) unlimited max user processes (-u) 16384 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited bash-4.1$ ps aux Segmentation fault (core dumped)

I also tried to run with strace but I don't see anything:

bash-4.1$ strace -f -F -v -s 8192 ps aux ... uname({sysname="Linux", nodename="node1", release="2.6.39-400.215.10.el6uek.x86_64", version="#1 SMP Wed Sep 10 00:07:12 PDT 2014", machine="x86_64"}) = 0 open("/sys/devices/system/cpu/online", O_RDONLY|O_CLOEXEC) = 3 read(3, "0-3\n", 8192) = 4 close(3) = 0 statfs("/selinux", {f_type=0xf97cff8c, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096}) = 0 brk(0) = 0x1daa000 brk(0x1dcb000) = 0x1dcb000 open("/usr/lib/locale/locale-archive", O_RDONLY) = 3 fstat(3, {st_dev=makedev(252, 0), st_ino=408478, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=193600, st_size=99158576, st_atime=2015/05/03-16:54:32, st_mtime=2014/09/03-11:14:03, st_ctime=2014/09/03-11:14:03}) = 0 mmap(NULL, 99158576, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f8d56d55000 ... rt_sigaction(SIGTRAP, {0x401ed0, ~[RTMIN RT_1], SA_RESTORER, 0x37ad8326b0}, NULL, 8) = 0 rt_sigaction(SIGILL, {0x401ed0, ~[RTMIN RT_1], SA_RESTORER, 0x37ad8326b0}, NULL, 8) = 0 rt_sigaction(SIGHUP, {0x401ed0, ~[RTMIN RT_1], SA_RESTORER, 0x37ad8326b0}, NULL, 8) = 0 --- SIGSEGV (Segmentation fault) @ 0 (0) --- +++ killed by SIGSEGV (core dumped) +++ Segmentation fault (core dumped)

Thanks in advance!

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  • What is your OS/version ? Commented May 4, 2015 at 11:01
  • Oracle Linux Server release 6.5 $ uname -r 2.6.39-400.215.10.el6uek.x86_64 Commented May 4, 2015 at 12:16

1 Answer 1

Reset to default
4

Try to increment the user stack size, the default on my Linux workstation is:

stack size (kbytes, -s) 8192
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  • ok, I think you're right. I created a new user and it has the 8192 as stack size. The ps runs OK then when I change it to 256 I got the segmentation fault. Now I've to find where is configured the 256 limit for that user because the file /etc/security/limits.conf is with default values. Commented May 4, 2015 at 12:19
  • Nice, set it in limits.conf for the concerned user then and restart, it should work. Commented May 4, 2015 at 13:09
  • some consultant set up "ulimit -s 256" on the .bash_profile and didn't noticed us :-( Commented May 4, 2015 at 14:50

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