• Serge E. Hallyn's avatar
    [PATCH] namespaces: fix exit race by splitting exit · 7a238fcb
    Serge E. Hallyn authored
    Fix exit race by splitting the nsproxy putting into two pieces.  First
    piece reduces the nsproxy refcount.  If we dropped the last reference, then
    it puts the mnt_ns, and returns the nsproxy as a hint to the caller.  Else
    it returns NULL.  The second piece of exiting task namespaces sets
    tsk->nsproxy to NULL, and drops the references to other namespaces and
    frees the nsproxy only if an nsproxy was passed in.
    
    A little awkward and should probably be reworked, but hopefully it fixes
    the NFS oops.
    Signed-off-by: default avatarSerge E. Hallyn <serue@us.ibm.com>
    Cc: Herbert Poetzl <herbert@13thfloor.at>
    Cc: Oleg Nesterov <oleg@tv-sign.ru>
    Cc: "Eric W. Biederman" <ebiederm@xmission.com>
    Cc: Cedric Le Goater <clg@fr.ibm.com>
    Cc: Daniel Hokka Zakrisson <daniel@hozac.com>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    7a238fcb
fork.c 42.2 KB