[Yum] yum running multiple times at once

[Joshua Jensen]

We've got a machine that is running yum from cron, and currently has 
something like 12 instances of yum running.  It looks like an rpm lock 
issues for a new yum process I start:

stat64("/var/lib/rpm/__db.001", {st_mode=S_IFREG|0644, st_size=16384, ...}) = 0
open("/var/lib/rpm/__db.001", O_RDWR|O_LARGEFILE) = 3
fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
fstat64(3, {st_mode=S_IFREG|0644, st_size=16384, ...}) = 0
close(3)                                = 0
open("/var/lib/rpm/__db.001", O_RDWR|O_LARGEFILE) = 3
fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
mmap2(NULL, 16384, PROT_READ|PROT_WRITE, MAP_SHARED, 3, 0) = 0xb73b2000
close(3)                                = 0
futex(0xb73b2000, FUTEX_WAIT, 2, NULL)  = -1 EINTR (Interrupted system call)
--- SIGINT (Interrupt) @ 0 (0) ---
rt_sigreturn(0xb73b2000)                = -1 EINTR (Interrupted system call)
futex(0xb73b2000, FUTEX_WAIT, 2, NULL)  = -1 EINTR (Interrupted system call)
--- SIGINT (Interrupt) @ 0 (0) ---
rt_sigreturn(0xb73b2000)                = -1 EINTR (Interrupted system call)
futex(0xb73b2000, FUTEX_WAIT, 2, NULL)  = -1 EINTR (Interrupted system call)
--- SIGINT (Interrupt) @ 0 (0) ---
rt_sigreturn(0xb73b2000)                = -1 EINTR (Interrupted system call)
....etc....


Isn't yum's own /var/run/yum.pid lockfile supposed to keep yum from
running but once?  If so, shouldn't yum check this file *first* before
trying for a lock on /var/lib/rpm/__db.001 ??  This is disturbing.


-- 
Joshua Jensen
joshua at iwsp.com
"If God didn't want us to eat animals, why did he make them out of meat?"