CVS commit: src/sys/kern

["Juergen Hannken-Illjes" <hannken%netbsd.org@localhost>]

Module Name:    src
Committed By:   hannken
Date:           Tue Apr 15 09:50:45 UTC 2014

Modified Files:
        src/sys/kern: vfs_trans.c

Log Message:
Fix a deadlock where one thread exits, enters fstrans_lwp_dtor()
and wants fstrans_lock.  This thread holds the proc_lock.
Another thread holds fstrans_lock and runs pserialize_perform().
As the first thread holds the proc_lock, timeouts are blocked and
the second thread blocks forever in kpause().

Change fstrans_lwp_dtor() to invalidate, but not free its info
structs.  No need to take fstrans_lock.

Change fstrans_get_lwp_info() to reuse invalidated info before
trying to allocate a new one.


To generate a diff of this commit:
cvs rdiff -u -r1.29 -r1.30 src/sys/kern/vfs_trans.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.