CVSROOT: /cvs
Module name: src
Changes by: [email protected] 2022/07/07 07:52:20
Modified files:
sys/uvm : uvm_vnode.c
Log message:
Revert previous attempt at serializing `uo_refs'.
It is incorrect to look at/modify `uo_refs' without lock in uvm_vnp_sync().
However sleeping is not possible and spinning introduces a deadlock with the
KERNEL_LOCK() when another thread faults on a mmaped region related to a
vnode we're currently synching.
A proper fix should be investigated. For now a kown a race, mostly safe due
to the KERNEL_LOCK(), is better than a possible deadlock.
Issue reported by caspar@
Discussed with and ok semarie@
