Re: [bug] writes hanging

[Jaegeuk Kim <jaegeuk.kim@samsung.com>]

Hi,

I couldn't get any error when replaying your scenario on my arm board.
So, could you send the backtrace of any hanged process?

# cat /proc/[pid]/stack

Thanks,

2013-12-20 (금), 12:29 -0800, John Grub:
> Hello,
> 
> I can't seem to write larger files on my f2fs mount.
> My hardware is an embedded arm platform with an 8GB eMMC nand flash
> chip: Golbalscale D2Plug
> I have two of these pieces of hardware and I see this issue on both of
> them. There is no issue when I use ext4.
> I am running kernel version 3.13.0-rc4
> I've compiled  f2fs-tools from here
> http://git.kernel.org/cgit/linux/kernel/git/jaegeuk/f2fs-tools.git @
> 11d187cdfa2dcf504aa25b5a1aab4228f19f22ff
> 
> 
> I've followed the installation and usage instructions in
> linux/Documentation/filesystems/f2fs.txt to format my 8GB eMMC nand
> flash as f2fs.
> 
> 
> I'm getting freezes when writing larger files to my f2fs partition.
> Here is an experiment I've done to show this.
> First create 3 test files of different sizes:
> # cat /dev/urandom | head -c 50k > /tmp/50k
> # cat /dev/urandom | head -c 100k > /tmp/100k
> 
> # cat /dev/urandom | head -c 150k > /tmp/150k
> 
> 
> 
> Test case #1: Repeatedly copy the same 50k file to j2fs:
> # cp /tmp/50k /mnt/j2fs/ <-- this copy always works fine
> # cp /tmp/50k /mnt/j2fs/ <-- this copy always works fine
> # cp /tmp/50k /mnt/j2fs/ <-- this copy always hangs forever
> For the failing copy, I've seen 4k, 8k and 12k copied correctly before
> it stops.
> 
> 
> Test case #2: Repeatedly copy the same 100k file to f2fs:
> # cp /tmp/100k /mnt/f2fs/ <-- this copy works fine
> # cp /tmp/100k /mnt/f2fs/ <-- this copy hangs forever
> 
> For the failing copy, I've seen 4k, 8k and 12k copied correctly before
> it stops.
> 
> 
> 
> Test case #3: Copy a 150k file to f2fs:
> # cp /tmp/150k /mnt/f2fs/
> 
> This never completes and will hang forever if I don't kill it. It
> always seems to fail at 120k.
> 
> 
> 
> Any help would be appreciated.
> 
> 
> Thanks,
> John Grub
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-- 
Jaegeuk Kim
Samsung



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