Messages in this thread | | | Date | Tue, 18 Nov 2014 16:49:35 +0100 | From | Philipp Hachtmann <> | Subject | VFS: Parallel unmounting of filesystems produces system call error |
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Hi Al,
I just ran some tests involving many parallel mount and unmount operations. I sometimes get EINVAL and the umount program says "not mounted". Which is definitively wrong. It feels like a race condition somewhere in the VFS code.
I use todays master branch (commit fc14f9c1272f62c3) on s390 with 1024 DASD devices.
In fs/namespace.c, sys_umount:
> retval = user_path_mountpoint_at(AT_FDCWD, name, > lookup_flags, &path); ... > retval = -EINVAL; > if (path.dentry != path.mnt->mnt_root) > goto dput_and_out; This seems to be erroneously true from time to time.
The script does something equivalent to: > for n in $DEVNODES; do > umount $n & > done
Do you have any idea what's wrong?
Kind regards
Philipp
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