On Fri, Jan 30, 2015 at 07:40:51PM -0800, Jeremiah Mahler wrote:
>
> If a large file (> 1 GB) is transferred from a USB stick or a mmc
> to an local disc (using ext4), it will proceed normally until it
> has transferred approximately 600 MB. Then the speed will drop off
> to zero and the terminal performing the operation will usually
> hang. And sometimes other terminals will hang as well. A reboot
> is required to get the system working again.
>
> mount /dev/sdb1 /mnt
> pv /mnt/large_file > large_file_out
> (... ~600 MB ... hang)
>
> I have performed a bisect and found that commit ef39794651347 introduced
> the bug. This commit is present in the latest -next 20150130.
Thanks for the bug report. I was able to reproduce the problem, and
found the problem. Unfortunately I accidentally introduce this in my
most recent patchset. I'll fix it up, but here is the patch until I
get the a new version pushed out.
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 82c2984..0046861 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -1192,9 +1192,9 @@ void __mark_inode_dirty(struct inode *inode, int flags)
trace_writeback_dirty_inode(inode, flags);
}
- dirtytime = flags & I_DIRTY_TIME;
if (flags & I_DIRTY_INODE)
flags &= ~I_DIRTY_TIME;
+ dirtytime = flags & I_DIRTY_TIME;
/*
* Paired with smp_mb() in __writeback_single_inode() for the
- Ted
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