LinuxQuestions.org - View/Stop and and all cron jobs?

- Linux - General (https://www.linuxquestions.org/questions/linux-general-1/)

- - View/Stop and and all cron jobs? (https://www.linuxquestions.org/questions/linux-general-1/view-stop-and-and-all-cron-jobs-119472/)

View/Stop and and all cron jobs?

I have a server that seems to hang/die sometime every week between Friday afternoon and early Monday morning.....I'm having a hard time troubleshooting what's causing it, but I imagine it's something in cron.weekly (?)....How can I find out if there's anything scheduled to run between those times? Do I have to check crontab for each and every user or what? Thanks....

Re: View/Stop and and all cron jobs?

Quote:

Originally posted by Tenover
How can I find out if there's anything scheduled to run between those times? Do I have to check crontab for each and every user or what? Thanks....

Yep ... look at everything in /var/spool/cron,
even though a user space process (anything
that isn't run by root) shouldn't be able to
crash the box...

Cheers,
Tink

Thanks....There's NOTHING in there....However when I look in /var/spool/anacron, there are two entries (One in cron.daily and one in cron.weekly) that are just the past two dates when this thing has crashed. I tried to do a "more cron.daily" but all it gives me is that date...Any ideas?

I'm not using anacron (I start "at" jobs in
rc.local instead ;)) ... maybe there's a
anacron log directory? :)

Cheers,
Tink

Ok, after checking my "lastlog", I see this in there, followed by "last message repeated..." for about 1000 lines, clogging up my syslog and having gpm run at 99.9% of the CPU....

Nov 25 08:28:41 praesto1 gpm[938]: Error in read()ing first: No such file or dir
ectory
Nov 25 08:28:49 praesto1 last message repeated 202659 times

Try running strace gpm &> file
Then look at the file, and see what's failing. Could be certain devices or something like that are missing. it also could be a config file that's bad.

Here's what the file tells me....

execve("/usr/sbin/gpm", ["gpm"], [/* 51 vars */]) = 0
uname({sys="Linux", node="praesto1", ...}) = 0
brk(0) = 0x805a500
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0
x40017000
open("/etc/ld.so.preload", O_RDONLY) = -1 ENOENT (No such file or direct
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=69846, ...}) = 0
old_mmap(NULL, 69846, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40018000
close(3) = 0
open("/lib/i686/libc.so.6", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0@\307\1"..., 1024)
4
fstat64(3, {st_mode=S_IFREG|0755, st_size=5779542, ...}) = 0
old_mmap(NULL, 1291464, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x4002a00
mprotect(0x4015c000, 38088, PROT_NONE) = 0
old_mmap(0x4015c000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3,
1000) = 0x4015c000
old_mmap(0x40162000, 13512, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP
YMOUS, -1, 0) = 0x40162000
close(3) = 0
munmap(0x40018000, 69846) = 0
brk(0) = 0x805a500
brk(0x805a680) = 0x805a680
brk(0x805b000) = 0x805b000
open("/var/run/gpm.pid", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0600, st_size=5, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
018000
read(3, "1411\n", 4096) = 5
close(3) = 0
munmap(0x40018000, 4096) = 0
kill(1411, SIG_0) = 0
open("/dev/tty0", O_WRONLY) = 3
ioctl(3, 0x541c, 0x8056fa0) = 0
close(3) = 0
fork() = 1416
--- SIGCHLD (Child exited) ---
_exit(0) = ?

Do the same but with strace -f
Like that it will follow child processes. problem here isn't in the main one, it's a fork that's causing the problems.

Ok, here's the output...

execve("/usr/sbin/gpm", ["gpm"], [/* 51 vars */]) = 0
uname({sys="Linux", node="praesto1", ...}) = 0
brk(0) = 0x805a500
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0
x40017000
open("/etc/ld.so.preload", O_RDONLY) = -1 ENOENT (No such file or direct
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=69846, ...}) = 0
old_mmap(NULL, 69846, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40018000
close(3) = 0
open("/lib/i686/libc.so.6", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0@\307\1"..., 1024)
4
fstat64(3, {st_mode=S_IFREG|0755, st_size=5779542, ...}) = 0
old_mmap(NULL, 1291464, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x4002a00
mprotect(0x4015c000, 38088, PROT_NONE) = 0
old_mmap(0x4015c000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3,
1000) = 0x4015c000
old_mmap(0x40162000, 13512, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP
YMOUS, -1, 0) = 0x40162000
close(3) = 0
munmap(0x40018000, 69846) = 0
brk(0) = 0x805a500
brk(0x805a680) = 0x805a680
brk(0x805b000) = 0x805b000
open("/var/run/gpm.pid", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0600, st_size=5, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
018000
read(3, "1411\n", 4096) = 5
close(3) = 0
munmap(0x40018000, 4096) = 0
kill(1411, SIG_0) = 0
open("/dev/tty0", O_WRONLY) = 3
ioctl(3, 0x541c, 0x8056fa0) = 0
close(3) = 0
fork() = 1416
--- SIGCHLD (Child exited) ---
_exit(0) = ?

Wierd.. my output looks nothing like that...
Are you using the newest gpm?

OOps, my bad...I had killed gpm when it started taking up 99.9% of the CPU! Here's the output after starting it again...

execve("/usr/sbin/gpm", ["gpm"], [/* 51 vars */]) = 0
uname({sys="Linux", node="praesto1", ...}) = 0
brk(0) = 0x805a500
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
x40017000
open("/etc/ld.so.preload", O_RDONLY) = -1 ENOENT (No such file or directory
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=69846, ...}) = 0
old_mmap(NULL, 69846, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40018000
close(3) = 0
open("/lib/i686/libc.so.6", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0@\307\1"..., 1024) = 1
4
fstat64(3, {st_mode=S_IFREG|0755, st_size=5779542, ...}) = 0
old_mmap(NULL, 1291464, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x4002a000
mprotect(0x4015c000, 38088, PROT_NONE) = 0
old_mmap(0x4015c000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x
1000) = 0x4015c000
old_mmap(0x40162000, 13512, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_AN
YMOUS, -1, 0) = 0x40162000
close(3) = 0
munmap(0x40018000, 69846) = 0
brk(0) = 0x805a500
brk(0x805a680) = 0x805a680
brk(0x805b000) = 0x805b000
open("/var/run/gpm.pid", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0600, st_size=5, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x
018000
read(3, "1411\n", 4096) = 5
close(3) = 0
munmap(0x40018000, 4096) = 0
kill(1411, SIG_0) = 0
open("/dev/tty0", O_WRONLY) = 3
ioctl(3, 0x541c, 0x8056fa0) = 0
close(3) = 0
fork() = 1539
[pid 1539] close(0) = 0
[pid 1539] close(1) = 0
[pid 1539] close(2) = 0
[pid 1539] open("/dev/console", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 0
[pid 1539] setsid() = 1539
[pid 1539] chdir("/") = 0
[pid 1539] umask(022) = 022
[pid 1539] gettimeofday({1069786274, 130636}, NULL) = 0
[pid 1539] getpid() = 1539
[pid 1539] open("/var/run//gpmiF88HQ", O_RDWR|O_CREAT|O_EXCL, 0600) = 1
[pid 1539] open("/var/run//gpmiF88HQ", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 2
[pid 1539] getpid() = 1539
[pid 1539] fstat64(2, {st_mode=S_IFREG|0600, st_size=0, ...}) = 0
[pid 1539] mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
1, 0) = 0x40018000
[pid 1539] write(2, "1539\n", 5) = 5
[pid 1539] close(2) = 0
[pid 1539] munmap(0x40018000, 4096) = 0
[pid 1539] link("/var/run//gpmiF88HQ", "/var/run/gpm.pid") = -1 EEXIST (File
ists)
[pid 1539] open("/var/run/gpm.pid", O_RDONLY) = 2
[pid 1539] fstat64(2, {st_mode=S_IFREG|0600, st_size=5, ...}) = 0
[pid 1539] mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
1, 0) = 0x40018000
[pid 1539] read(2, "1411\n", 4096) = 5
[pid 1539] unlink("/var/run//gpmiF88HQ") = 0
[pid 1539] brk(0x805e000) = 0x805e000
[pid 1539] time([1069786274]) = 1069786274
[pid 1539] open("/etc/localtime", O_RDONLY) = 3
[pid 1539] fstat64(3, {st_mode=S_IFREG|0644, st_size=1017, ...}) = 0
[pid 1539] mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
1, 0) = 0x40019000
[pid 1539] read(3, "TZif\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\4\0\0\0\4\0"..
4096) = 1017
[pid 1539] close(3) = 0
[pid 1539] munmap(0x40019000, 4096) = 0
[pid 1539] getpid() = 1539
[pid 1539] rt_sigaction(SIGPIPE, {0x401143c0, [], 0x4000000}, {SIG_DFL}, 8) =
[pid 1539] socket(PF_UNIX, SOCK_DGRAM, 0) = 3
[pid 1539] fcntl64(0x3, 0x2, 0x1, 0x40114190) = 0
[pid 1539] connect(3, {sin_family=AF_UNIX, path="/dev/log"}, 16) = -1 ENOENT
o such file or directory)
[pid 1539] close(3) = 0
[pid 1539] rt_sigaction(SIGPIPE, {SIG_DFL}, NULL, 8) = 0
[pid 1539] time([1069786274]) = 1069786274
[pid 1539] getpid() = 1539
[pid 1539] rt_sigaction(SIGPIPE, {0x401143c0, [], 0x4000000}, {SIG_DFL}, 8) =
[pid 1539] socket(PF_UNIX, SOCK_DGRAM, 0) = 3
[pid 1539] fcntl64(0x3, 0x2, 0x1, 0x40114190) = 0
[pid 1539] connect(3, {sin_family=AF_UNIX, path="/dev/log"}, 16) = -1 ENOENT
o such file or directory)
[pid 1539] close(3) = 0
[pid 1539] rt_sigaction(SIGPIPE, {SIG_DFL}, NULL, 8) = 0
[pid 1539] fstat64(0, {st_mode=S_IFCHR|0600, st_rdev=makedev(5, 1), ...}) = 0
[pid 1539] ioctl(0, 0x5401, {B38400 opost isig icanon echo ...}) = 0
[pid 1539] mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
1, 0) = 0x40019000
[pid 1539] write(0, "gpm: oops() invoked from gpn.c(2"..., 36) = 36
[pid 1539] write(0, "gpm already running as pid 1411:"..., 59) = 59
[pid 1539] munmap(0x40019000, 4096) = 0
[pid 1539] _exit(1) = ?
--- SIGCHLD (Child exited) ---
_exit(0) = ?

What's the contents of /etc/crontab (grep /etc/crontab -e "^[\*,0-9]") and dirs (grep /etc/crontab -e run-parts) containing cronjobs?

First one:

01 * * * * root run-parts /etc/cron.hourly
02 1 * * * root run-parts /etc/cron.daily
22 4 * * 0 root run-parts /etc/cron.weekly
42 4 1 * * root run-parts /etc/cron.monthly

Second one:

# run-parts
01 * * * * root run-parts /etc/cron.hourly
02 1 * * * root run-parts /etc/cron.daily
22 4 * * 0 root run-parts /etc/cron.weekly
42 4 1 * * root run-parts /etc/cron.monthly

Same thing??

Ahhh, OK. Could you list the contents of those four dirs please?