Red Hat Bugzilla – Bug 151897
RHEL4: "lsof -b" hangs if a process is stuck in disk-wait
Last modified: 2007-11-30 17:07:17 EST
+++ This bug was initially created as a clone of Bug #131712 +++ Description of problem: 'lsof -b', hangs in disk-wait if another process is also stuck in disk-wait. Version-Release number of selected component (if applicable): 4.72-1 How reproducible: ~10-30% on first try. Often takes several iterations of step (4) below. Steps to Reproduce: 1. Mount NFS export from another machine (hard mount, not soft) 2. cd /new_nfs_mount; while [ 0 ]; do find . ; done 3. Disable NFS export+ifdown interface and/or reboot NFS server 4. Run 'lsof -b' on client Actual results: Step (4) hangs while doing stat64; lsof process goes into disk-wait: read(4, "30030 (bash) S 30025 30030 30030"..., 4096) = 224 close(4) = 0 munmap(0xb7298000, 4096) = 0 readlink("/proc/30030/cwd", "/mnt/tmp", 4096) = 8 stat64("/proc/30030/cwd", Expected results: No hang. Additional info: I tried the above steps with the following combinations, all hung after a few tries. RHEL 2.1 + lsof 4.52 RHEL 2.1 + lsof 4.63 RHEL 3 + lsof 4.63 RHEL 3 + lsof 4.72 Fedora Core 2 + lsof 4.72 Could it possibly a kernel bug? The original process goes into disk wait, while 'lsof -b' subsequently succeeds a few times (usually) before hanging.
removing old acks
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2006-0229.html