CVSROOT: /cvs
Module name: src
Changes by: bl...@cvs.openbsd.org 2015/05/18 13:10:35
Modified files:
sys/kern : kern_sysctl.c
Log message:
For each file in sysctl(KERN_FILE_BYFILE), FILLIT() calls fill_file(),
which calls VOP_GETATTR(). For NFS, that leads to nfs_getattr().
If the node's attributes are not in NFS's cache, nfs_getattr() will
invoke nfs_request() and the latter will sleep, allowing the file
pointer to disappear while we traverse the list.
This results in kernel crashes while running netstat or pstat -f.
Grab a reference to the file descriptor before calling FILLIT(),
and release it afterwards. This way the file descriptor cannot
disappear while we sleep in nfs_getattr().
Analysis and fix from Pedro Martelletto; input and OK guenther@ mpi@
