[PATCH] userfaultfd.2: document spurious UFFD_EVENT_FORK
From: Mike Rapoport <hidden>
Date: 2017-10-26 13:04:17
Also in:
linux-mm
Subsystem:
the rest · Maintainer:
Linus Torvalds
Signed-off-by: Mike Rapoport <redacted> --- man2/userfaultfd.2 | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/man2/userfaultfd.2 b/man2/userfaultfd.2
index 1c9e64b..08c41e1 100644
--- a/man2/userfaultfd.2
+++ b/man2/userfaultfd.2@@ -465,6 +465,16 @@ for checkpoint/restore mechanisms, as well as post-copy migration to allow (nearly) uninterrupted execution when transferring virtual machines and Linux containers from one host to another. +.SH BUGS +If the +.B UFFD_FEATURE_EVENT_FORK +is enabled and a system call from the +.BR fork (2) +family is interrupted by a signal or failed,q a stale userfaultfd descriptor +might be created. +In this case a spurious +.B UFFD_EVENT_FORK +will be delivered to the userfaultfd monitor. .SH EXAMPLE The program below demonstrates the use of the userfaultfd mechanism. The program creates two threads, one of which acts as the
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2.7.4
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