git: kernel - Fix dangling ref on fifo vnode

Matthew Dillon dillon at
Wed Aug 21 10:21:27 PDT 2019

commit f9ad1101b0562c99b91008bf7012745e86f230c0
Author: Matthew Dillon <dillon at>
Date:   Wed Aug 21 10:17:50 2019 -0700

    kernel - Fix dangling ref on fifo vnode
    * Fix dangling refs on the fifo vnode which prevent unmount from
    * Fix open/close races which can occur during fifo open and close
      due to blocking conditions.  Use a lockmgr lock instead.
    * Retain use of vp->v_token to help interlock read, write, and
      ioctl operations.
    * This situation occurs when a filesystem fifo (aka via mkfifo)
      blocks on open() and is then interrupted.

Summary of changes:
 sys/vfs/fifofs/fifo_vnops.c | 212 ++++++++++++++++++++++++++++++++------------
 1 file changed, 155 insertions(+), 57 deletions(-)

DragonFly BSD source repository

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