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Jonathan Creekmore
9c89dc9520
With the addition of FMODE_ATOMIC_POS in the Linux 3.14 kernel, concurrent blocking file accesses to a single open file descriptor can cause a deadlock trying to grab the file position lock. If a watch has been set up, causing a read_thread to blocking read on the file descriptor, then future writes that would cause the background read to complete will block waiting on the file position lock before they can execute. This race condition only occurs when libxenstore is accessing the xenstore daemon through the /proc/xen/xenbus file and not through the unix domain socket, which is the case when the xenstore daemon is running as a stub domain or when oxenstored is passed --disable-socket. Accessing the daemon from the true character device also does not exhibit this problem. On Linux, prefer using the character device file over the proc file if the character device exists. Signed-off-by: Jonathan Creekmore <jonathan.creekmore@gmail.com> Acked-by: Wei Liu <wei.liu2@citrix.com> Acked-by: Ian Campbell <ian.campbell@citrix.com>
The following files are imported from the Samba project. We use the versions from Samba 3, the current stable branch. talloc.c: samba-trunk/source/lib/talloc.c r14291 2006-03-13 04:27:47 +0000 talloc.h: samba-trunk/source/include/talloc.h r11986 2005-12-01 00:43:36 +0000