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net: Fix soft lockups/OOM issues w/ unix garbage collector

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This is an implementation of David Miller's suggested fix in:
  https://bugzilla.redhat.com/show_bug.cgi?id=470201

It has been updated to use wait_event() instead of
wait_event_interruptible().

Paraphrasing the description from the above report, it makes sendmsg()
block while UNIX garbage collection is in progress. This avoids a
situation where child processes continue to queue new FDs over a
AF_UNIX socket to a parent which is in the exit path and running
garbage collection on these FDs. This contention can result in soft
lockups and oom-killing of unrelated processes.

Signed-off-by: dann frazier <dannf@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
dann frazier 2008-11-26 15:32:27 -08:00 • committed by David S. Miller
parent efbbced361
commit 5f23b73496
3 changed files with 13 additions and 3 deletions
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1
include/net/af_unix.h
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@ -9,6 +9,7 @@
extern void unix_inflight(struct file *fp);
extern void unix_notinflight(struct file *fp);
extern void unix_gc(void);
extern void wait_for_unix_gc(void);
#define UNIX_HASH_SIZE 256