Re: ZRAM 3.10.6 Buffer I/O error

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12.08.2013 17:27, Jordi Pujol skrev:
Hello,

zram shows an error when mounting a swap partition,
current version Linux kernel 3.10.6,
previous versions worked, I suppose that latest zram patches have some
problem,

machine is an AMD64 dual core, 4GB RAM

+ modprobe -qb zram num_devices=2
+ echo 104857600 > /sys/block/zram0/disksize

# mkswap /dev/zram0
Setting up swapspace version 1, size = 102396 KiB
no label, UUID=6c249930-2ba0-46cf-a8c6-766481942b7d

# pager /var/log/dmesg
(no more errors shown)

# swapon /dev/zram0

# pager /var/log/dmesg
...
[  309.300479] Buffer I/O error on device zram0, logical block 25599
[  309.300491] Buffer I/O error on device zram0, logical block 25599
[  309.300514] Buffer I/O error on device zram0, logical block 25599
[  345.205887] Adding 102396k swap on /dev/zram0.  Priority:-2 extents:1
across:102396k SSFS

full log files and the kernel source are stored in the address:

http://livenet.selfip.com/ftp/debian/zram_3.10.6_IO_error/



I think this one should fix it and belongs in 3.10 stable too:

From 75c7caf5a052ffd8db3312fa7864ee2d142890c4 Mon Sep 17 00:00:00 2001
From: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
Date: Sat, 22 Jun 2013 14:21:00 +0000
Subject: zram: allow request end to coincide with disksize

Pass valid_io_request() checks if request end coincides with disksize
(end equals bound), only fail if we attempt to read beyond the bound.

mkfs.ext2 produces numerous errors:
[ 2164.632747] quiet_error: 1 callbacks suppressed
[ 2164.633260] Buffer I/O error on device zram0, logical block 153599
[ 2164.633265] lost page write due to I/O error on zram0

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c
index 7538774..82c7202 100644
--- a/drivers/staging/zram/zram_drv.c
+++ b/drivers/staging/zram/zram_drv.c
@@ -180,7 +180,7 @@ static inline int valid_io_request(struct zram *zram, struct bio *bio)
 	end = start + (bio->bi_size >> SECTOR_SHIFT);
 	bound = zram->disksize >> SECTOR_SHIFT;
 	/* out of range range */
-	if (unlikely(start >= bound || end >= bound || start > end))
+	if (unlikely(start >= bound || end > bound || start > end))
 		return 0;

 	/* I/O request is valid */
--
cgit v0.9.2

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