Re: [PATCH 1/2] UBI: Fix error path in scan_pool()
From: Richard Genoud
Date: Thu Sep 26 2013 - 05:25:50 EST
2013/9/26 Richard Genoud <richard.genoud@xxxxxxxxx>:
> 2013/9/26 Richard Weinberger <richard@xxxxxx>:
>> Am 26.09.2013 09:20, schrieb Richard Genoud:
>>> On 25/09/2013 22:32, Richard Weinberger wrote:
>>>> We have to set "ret", not "err" in case of an error.
>>>>
>>>> Reported-by: Richard Genoud <richard.genoud@xxxxxxxxx>
>>>> Signed-off-by: Richard Weinberger <richard@xxxxxx>
>>>> ---
>>>> drivers/mtd/ubi/fastmap.c | 2 +-
>>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/mtd/ubi/fastmap.c b/drivers/mtd/ubi/fastmap.c
>>>> index f5aa4b0..9b42add 100644
>>>> --- a/drivers/mtd/ubi/fastmap.c
>>>> +++ b/drivers/mtd/ubi/fastmap.c
>>>> @@ -428,7 +428,7 @@ static int scan_pool(struct ubi_device *ubi, struct ubi_attach_info *ai,
>>>> if (be32_to_cpu(ech->image_seq) != ubi->image_seq) {
>>>> ubi_err("bad image seq: 0x%x, expected: 0x%x",
>>>> be32_to_cpu(ech->image_seq), ubi->image_seq);
>>>> - err = UBI_BAD_FASTMAP;
>>>> + ret = UBI_BAD_FASTMAP;
>>>> goto out;
>>>> }
>>>>
>>>>
>>>
>>> Tested-by: Richard Genoud <richard.genoud@xxxxxxxxx>
>>>
>>> It reveals another bug though.
>>>
>>> [ 0.812500] UBI: default fastmap pool size: 95
>>> [ 0.820312] UBI: default fastmap WL pool size: 25
>>> [ 0.820312] UBI: attaching mtd2 to ubi0
>>> [ 0.914062] UBI error: scan_pool: bad image seq: 0x0, expected: 0x352a9728
>>
>> This worries me more...
>> The fastmap is corrupted, now we have to find out why.
>> Broken driver? Powercut? IO errors?
> I guess this is caused by u-boot when it deletes the UBI fastmap
> internal volume.
> I'm replaying the whole scenario with debug to see when it happens.
I added some traces and I found that : (dumping ec_header after
"ubi_io_read_ec_hdr(ubi, pnum, ech, 0); " in ubi_scan_fastmap())
[ 0.812500] UBI: default fastmap pool size: 95
[ 0.820312] UBI: default fastmap WL pool size: 25
[ 0.828125] UBI: attaching mtd2 to ubi0
[ 0.851562] ubi_scan_fastmap:
[ 0.859375] Erase counter header dump:
[ 0.859375] magic 0x55424923
[ 0.867187] version 1
[ 0.867187] ec 1
[ 0.867187] vid_hdr_offset 2048
[ 0.875000] data_offset 4096
[ 0.875000] image_seq 891983656 <- image seq is good.
[ 0.875000] hdr_crc 0x13cc9a78
[ 0.882812] erase counter header hexdump:
[ 0.882812] 00000000: 55 42 49 23 01 00 00 00 00 00 00 00 00 00 00
01 00 00 08 00 00 00 10 00 35 2a 97
28 00 00 00 00 UBI#....................5*.(....
[ 0.890625] 00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00
00 13 cc 9a 78 ...............................x
[ 0.960937] UBI error: scan_pool: bad image seq: 0x0, expected: 0x352a9728
[ 0.968750] UBI error: ubi_scan_fastmap: Attach by fastmap failed,
doing a full scan!
[ 0.976562] kmem_cache_destroy ubi_ainf_peb_slab: Slab cache still
has objects
[ 0.976562] CPU: 0 PID: 1 Comm: swapper Not tainted 3.11.1 #20
[ 0.984375] [<c0012e20>] (unwind_backtrace+0x0/0xe0) from
[<c0010bb8>] (show_stack+0x10/0x14)
[ 0.992187] [<c0010bb8>] (show_stack+0x10/0x14) from [<c01a15e4>]
(destroy_ai+0x230/0x244)
[ 1.000000] [<c01a15e4>] (destroy_ai+0x230/0x244) from [<c01a2c4c>]
(ubi_attach+0x1e8/0x34c)
[ 1.007812] [<c01a2c4c>] (ubi_attach+0x1e8/0x34c) from [<c0197678>]
(ubi_attach_mtd_dev+0x2b8/0x86c)
[ 1.015625] [<c0197678>] (ubi_attach_mtd_dev+0x2b8/0x86c) from
[<c0346630>] (ubi_init+0x1d8/0x29c)
[ 1.023437] [<c0346630>] (ubi_init+0x1d8/0x29c) from [<c0008810>]
(do_one_initcall+0x94/0x144)
[ 1.031250] [<c0008810>] (do_one_initcall+0x94/0x144) from
[<c0335a9c>] (kernel_init_freeable+0xe8/0x1a
c)
[ 1.039062] [<c0335a9c>] (kernel_init_freeable+0xe8/0x1ac) from
[<c0251528>] (kernel_init+0x8/0xe4)
[ 1.046875] [<c0251528>] (kernel_init+0x8/0xe4) from [<c000e590>]
(ret_from_fork+0x14/0x24)
[ 1.804687] UBI: scanning is finished
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