WANG Cong 06a77b07e3 af_unix: conditionally use freezable blocking calls in read ... Commit 2b15af6f95 ("af_unix: use freezable blocking calls in read") converts schedule_timeout() to its freezable version, it was probably correct at that time, but later, commit 2b514574f7 ("net: af_unix: implement splice for stream af_unix sockets") breaks the strong requirement for a freezable sleep, according to commit 0f9548ca10: We shouldn't try_to_freeze if locks are held. Holding a lock can cause a deadlock if the lock is later acquired in the suspend or hibernate path (e.g. by dpm). Holding a lock can also cause a deadlock in the case of cgroup_freezer if a lock is held inside a frozen cgroup that is later acquired by a process outside that group. The pipe_lock is still held at that point. So use freezable version only for the recvmsg call path, avoid impact for Android. Fixes: 2b514574f7 ("net: af_unix: implement splice for stream af_unix sockets") Reported-by: Dmitry Vyukov <dvyukov@google.com> Cc: Tejun Heo <tj@kernel.org> Cc: Colin Cross <ccross@android.com> Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Cc: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2016-11-18 13:58:39 -05:00
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af_unix.c	af_unix: conditionally use freezable blocking calls in read	2016-11-18 13:58:39 -05:00
diag.c	unix_diag: fix incorrect sign extension in unix_lookup_by_ino	2016-02-19 23:49:23 -05:00
garbage.c	unix: correctly track in-flight fds in sending process user_struct	2016-02-08 10:30:42 -05:00
Kconfig	net: Default UDP and UNIX diag to 'n'.	2012-01-07 12:13:06 -08:00
Makefile	unix_diag: Write it into kbuild	2011-12-16 13:48:29 -05:00
sysctl_net_unix.c	net: Convert uses of typedef ctl_table to struct ctl_table	2013-06-13 02:36:09 -07:00