Perl hangs for regular users, works with sudo
Matthew Barrera 
I recently installed Ubuntu 14.04 LTS and for some reason the perl command just hangs when a regular user calls it. However, if I use sudo with it, it will work perfectly. I'm thinking the perl program is trying to read/write something that regular users have no permissions to, but how can I be sure or figure out what?
The perl version I have is v5.18.2 and is 64bit.
The reason I'm asking is I'm trying to run a make that apparently uses perl (so it hangs), but if I run it with sudo, I don't have permissions to write over the files the make generates.
If anyone has any suggestions, I'd greatly appreciate it. Thanks!
Edit: This is the output of strace perl -v. It goes on looping this chunk indefinitely.
7
execve("/apps/jas/bin/perl", ["perl", "-v"], [/* 62 vars */]) = 0 brk(0) = 0x7fe3c41f5000 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fe3c207d000 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=87654, ...}) = 0 mmap(NULL, 87654, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fe3c2067000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\320\37\2\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=1845024, ...}) = 0 mmap(NULL, 3953344, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fe3c1a97000 mprotect(0x7fe3c1c53000, 2093056, PROT_NONE) = 0 mmap(0x7fe3c1e52000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1bb000) = 0x7fe3c1e52000 mmap(0x7fe3c1e58000, 17088, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fe3c1e58000 close(3) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fe3c2066000 mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fe3c2064000 arch_prctl(ARCH_SET_FS, 0x7fe3c2064740) = 0 mprotect(0x7fe3c1e52000, 16384, PROT_READ) = 0 mprotect(0x7fe3c229d000, 8192, PROT_READ) = 0 mprotect(0x7fe3c207f000, 4096, PROT_READ) = 0 munmap(0x7fe3c2067000, 87654) = 0 getpid() = 29478 rt_sigaction(SIGCHLD, {0x7fe3c2094460, ~[RTMIN RT_1], SA_RESTORER, 0x7fe3c1acdff0}, NULL, 8) = 0 geteuid() = 42590 brk(0) = 0x7fe3c41f5000 brk(0x7fe3c4216000) = 0x7fe3c4216000 getppid() = 29475 stat("/lhome/username", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 stat(".", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 open("/apps/jas/bin/perl", O_RDONLY) = 3 fcntl(3, F_DUPFD, 10) = 10 close(3) = 0 fcntl(10, F_SETFD, FD_CLOEXEC) = 0 rt_sigaction(SIGINT, NULL, {SIG_DFL, [], 0}, 8) = 0 rt_sigaction(SIGINT, {0x7fe3c2094460, ~[RTMIN RT_1], SA_RESTORER, 0x7fe3c1acdff0}, NULL, 8) = 0 rt_sigaction(SIGQUIT, NULL, {SIG_DFL, [], 0}, 8) = 0 rt_sigaction(SIGQUIT, {SIG_DFL, ~[RTMIN RT_1], SA_RESTORER, 0x7fe3c1acdff0}, NULL, 8) = 0 rt_sigaction(SIGTERM, NULL, {SIG_DFL, [], 0}, 8) = 0 rt_sigaction(SIGTERM, {SIG_DFL, ~[RTMIN RT_1], SA_RESTORER, 0x7fe3c1acdff0}, NULL, 8) = 0 read(10, "#!/bin/sh\n\nDIRNAME=dirname $0\n"..., 8192) = 207 pipe([3, 4]) = 0 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7fe3c2064a10) = 29479 close(4) = 0 read(3, "/apps/jas/bin\n", 128) = 14 read(3, "", 128) = 0 --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=29479, si_status=0, si_utime=0, si_stime=0} --- rt_sigreturn() = 0 close(3) = 0 wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 29479 pipe([3, 4]) = 0 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7fe3c2064a10) = 29480 close(4) = 0 read(3, "Linux\n", 128) = 6 read(3, "", 128) = 0 --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=29480, si_status=0, si_utime=0, si_stime=0} --- rt_sigreturn() = 0 close(3) = 0 wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 29480
1 Answer
My system was using the wrong perl due to the way my PATH was stored. I organized my PATH and it's now working. If you're having a similar problem with another program, try checking your PATH.
