This is a note to let you know that I've just added the patch titled
aio: wake up waiters when freeing unused kiocbs
to the 3.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
aio-wake-up-waiters-when-freeing-unused-kiocbs.patch
and it can be found in the queue-3.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 880641bb9da2473e9ecf6c708d993b29928c1b3c Mon Sep 17 00:00:00 2001
From: Jeff Moyer <[email protected]>
Date: Mon, 5 Mar 2012 14:59:12 -0800
Subject: aio: wake up waiters when freeing unused kiocbs
From: Jeff Moyer <[email protected]>
commit 880641bb9da2473e9ecf6c708d993b29928c1b3c upstream.
Bart Van Assche reported a hung fio process when either hot-removing
storage or when interrupting the fio process itself. The (pruned) call
trace for the latter looks like so:
fio D 0000000000000001 0 6849 6848 0x00000004
ffff880092541b88 0000000000000046 ffff880000000000 ffff88012fa11dc0
ffff88012404be70 ffff880092541fd8 ffff880092541fd8 ffff880092541fd8
ffff880128b894d0 ffff88012404be70 ffff880092541b88 000000018106f24d
Call Trace:
schedule+0x3f/0x60
io_schedule+0x8f/0xd0
wait_for_all_aios+0xc0/0x100
exit_aio+0x55/0xc0
mmput+0x2d/0x110
exit_mm+0x10d/0x130
do_exit+0x671/0x860
do_group_exit+0x44/0xb0
get_signal_to_deliver+0x218/0x5a0
do_signal+0x65/0x700
do_notify_resume+0x65/0x80
int_signal+0x12/0x17
The problem lies with the allocation batching code. It will
opportunistically allocate kiocbs, and then trim back the list of iocbs
when there is not enough room in the completion ring to hold all of the
events.
In the case above, what happens is that the pruning back of events ends
up freeing up the last active request and the context is marked as dead,
so it is thus responsible for waking up waiters. Unfortunately, the
code does not check for this condition, so we end up with a hung task.
Signed-off-by: Jeff Moyer <[email protected]>
Reported-by: Bart Van Assche <[email protected]>
Tested-by: Bart Van Assche <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
fs/aio.c | 2 ++
1 file changed, 2 insertions(+)
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -490,6 +490,8 @@ static void kiocb_batch_free(struct kioc
kmem_cache_free(kiocb_cachep, req);
ctx->reqs_active--;
}
+ if (unlikely(!ctx->reqs_active && ctx->dead))
+ wake_up_all(&ctx->wait);
spin_unlock_irq(&ctx->ctx_lock);
}
Patches currently in stable-queue which might be from [email protected] are
queue-3.2/aio-wake-up-waiters-when-freeing-unused-kiocbs.patch
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