Does modern UBI/UBIFS still suffer from the 'unstable bits issue'?
Tim Harvey
tharvey at gateworks.com
Fri Mar 2 08:20:57 PST 2018
On Fri, Mar 2, 2018 at 2:07 AM, Richard Weinberger <richard at nod.at> wrote:
> Tim,
>
> Am Freitag, 2. März 2018, 02:19:54 CET schrieb Tim Harvey:
>> On Thu, Mar 1, 2018 at 8:32 AM, Richard Weinberger <richard at nod.at> wrote:
>> > Tim,
>> >
>> > Am Donnerstag, 1. März 2018, 17:15:44 CET schrieb Tim Harvey:
>> >> Greetings,
>> >>
>> >> I have a user with an IMX6 and raw NAND using UBI/UBIFS who has been
>> >
>> >> able to reproduce a NAND corruption:
>> > What does your user to reproduce this?
>>
>> Richard,
>>
>> It's unclear at the moment. It's one of those 'this happened twice on
>> two different boards' reports without a lot of detail. However I do
>> know they do write to the filesystem on every boot and do encounter
>> random power-cuts.
>>
>> >> [ 10.611972] UBIFS (ubi0:2): background thread "ubifs_bgt0_2" started,
>> >> PID 631 [ 10.634365] ubi0 warning: ubi_io_read: error -74 (ECC error)
>> >> while reading 253952 bytes from PEB 2807:8192, read only 253952 bytes,
>> >> retry [ 10.657492] ubi0 warning: ubi_io_read: error -74 (ECC error)
>> >> while reading 253952 bytes from PEB 2807:8192, read only 253952 bytes,
>> >> retry [
>> >> 10.681137] ubi0 warning: ubi_io_read: error -74 (ECC error) while reading
>> >> 253952 bytes from PEB 2807:8192, read only 253952 bytes, retry [
>> >> 10.704267] ubi0 error: ubi_io_read: error -74 (ECC error) while reading
>> >> 253952 bytes from PEB 2807:8192, read 253952 bytes
>
> BTW: I miss a back trace here. How did you obtain that messages?
>
[ 10.528272] Buffer I/O error on dev mtdblock0, logical block 0,
async page read
[ 10.611972] UBIFS (ubi0:2): background thread "ubifs_bgt0_2" started, PID 631
[ 10.634365] ubi0 warning: ubi_io_read: error -74 (ECC error) while
reading 253952 bytes from PEB 2807:8192, read only 253952 bytes, retry
[ 10.657492] ubi0 warning: ubi_io_read: error -74 (ECC error) while
reading 253952 bytes from PEB 2807:8192, read only 253952 bytes, retry
[ 10.681137] ubi0 warning: ubi_io_read: error -74 (ECC error) while
reading 253952 bytes from PEB 2807:8192, read only 253952 bytes, retry
[ 10.704267] ubi0 error: ubi_io_read: error -74 (ECC error) while
reading 253952 bytes from PEB 2807:8192, read 253952 bytes
[ 10.715425] CPU: 2 PID: 629 Comm: block Not tainted 4.4.0 #6
[ 10.721087] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
[ 10.727619] Backtrace:
[ 10.730108] [<8001e674>] (dump_backtrace) from [<8001e86c>]
(show_stack+0x18/0x1c)
[ 10.737679] r7:00000af7 r6:0003e000 r5:60000013 r4:00000000
[ 10.743406] [<8001e854>] (show_stack) from [<80232028>]
(dump_stack+0x84/0xa4)
[ 10.750649] [<80231fa4>] (dump_stack) from [<8030a9c4>]
(ubi_io_read+0x1dc/0x2b0)
[ 10.758132] r5:bf206000 r4:ffffffb6
[ 10.761744] [<8030a7e8>] (ubi_io_read) from [<80308974>]
(ubi_eba_read_leb+0x27c/0x388)
[ 10.769748] r10:be913c00 r9:00000000 r8:00000000 r7:00000002
r6:bf206000 r5:bf206000
[ 10.777646] r4:0003e000
[ 10.780204] [<803086f8>] (ubi_eba_read_leb) from [<80307864>]
(ubi_leb_read+0x74/0xc4)
[ 10.788120] r10:c0d81000 r9:00000002 r8:00000002 r7:00000000
r6:bf206000 r5:be913c00
[ 10.796020] r4:0003e000
[ 10.798579] [<803077f0>] (ubi_leb_read) from [<801da34c>]
(ubifs_leb_read+0x34/0x98)
[ 10.806322] r10:be55eec0 r9:00000002 r8:00000000 r7:00000002
r6:0003e000 r5:bf1cb000
[ 10.814221] r4:be560180
[ 10.816779] [<801da318>] (ubifs_leb_read) from [<801e19c8>]
(ubifs_start_scan+0x7c/0xf8)
[ 10.824869] r8:00000002 r7:c0d81000 r6:00000000 r5:bf1cb000 r4:be560180
[ 10.831648] [<801e194c>] (ubifs_start_scan) from [<801e1ccc>]
(ubifs_scan+0x2c/0x330)
[ 10.839477] r8:00000003 r7:0003e000 r6:c0d81000 r5:00000000 r4:bf1cb000
[ 10.846252] [<801e1ca0>] (ubifs_scan) from [<801e0e38>]
(ubifs_read_master+0xb4/0x924)
[ 10.854169] r10:be55eec0 r9:000000a0 r8:00000003 r7:00002000
r6:be560300 r5:be560180
[ 10.862069] r4:bf1cb000
[ 10.864622] [<801e0d84>] (ubifs_read_master) from [<801d82c4>]
(ubifs_mount+0xa7c/0x156c)
[ 10.872798] r10:be55eec0 r9:000000a0 r8:bf1cb87c r7:be538000
r6:00000000 r5:bf1cb000
[ 10.880697] r4:bf2da140
[ 10.883255] [<801d7848>] (ubifs_mount) from [<801011ac>] (mount_fs+0x1c/0xa0)
[ 10.890390] r10:be55e000 r9:806f2078 r8:00000000 r7:806f2078
r6:806f2078 r5:00000000
[ 10.898291] r4:801d7848
[ 10.900849] [<80101190>] (mount_fs) from [<80119054>]
(vfs_kern_mount+0x50/0x108)
[ 10.908332] r6:be55e180 r5:00000000 r4:bf1a6cc0
[ 10.913002] [<80119004>] (vfs_kern_mount) from [<8011c354>]
(do_mount+0x9d8/0xb70)
[ 10.920572] r9:806f2078 r8:be55e180 r7:7eeabe14 r6:00000400
r5:806dbc6c r4:00000008
[ 10.928391] [<8011b97c>] (do_mount) from [<8011c72c>] (SyS_mount+0x7c/0xa8)
[ 10.935354] r10:00000000 r9:be4f6000 r8:00000400 r7:7eeabe14
r6:be55e180 r5:be55e000
[ 10.943253] r4:00000000
[ 10.945811] [<8011c6b0>] (SyS_mount) from [<80009bc0>]
(ret_fast_syscall+0x0/0x3c)
[ 10.953380] r8:80009d84 r7:00000015 r6:00027014 r5:7eeabe14 r4:00000000
[ 10.984081] ubi0 warning: ubi_io_read: error -74 (ECC error) while
reading 253952 bytes from PEB 2807:8192, read only 253952 bytes, retry
[ 11.007847] ubi0 warning: ubi_io_read: error -74 (ECC error) while
reading 253952 bytes from PEB 2807:8192, read only 253952 bytes, retry
[ 11.031492] ubi0 warning: ubi_io_read: error -74 (ECC error) while
reading 253952 bytes from PEB 2807:8192, read only 253952 bytes, retry
[ 11.055202] ubi0 error: ubi_io_read: error -74 (ECC error) while
reading 253952 bytes from PEB 2807:8192, read 253952 bytes
[ 11.066358] CPU: 2 PID: 629 Comm: block Not tainted 4.4.0 #6
[ 11.072020] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
[ 11.078549] Backtrace:
[ 11.081034] [<8001e674>] (dump_backtrace) from [<8001e86c>]
(show_stack+0x18/0x1c)
[ 11.088606] r7:00000af7 r6:0003e000 r5:60000013 r4:00000000
[ 11.094334] [<8001e854>] (show_stack) from [<80232028>]
(dump_stack+0x84/0xa4)
[ 11.101575] [<80231fa4>] (dump_stack) from [<8030a9c4>]
(ubi_io_read+0x1dc/0x2b0)
[ 11.109058] r5:bf206000 r4:ffffffb6
[ 11.112669] [<8030a7e8>] (ubi_io_read) from [<80308974>]
(ubi_eba_read_leb+0x27c/0x388)
[ 11.120673] r10:be913c00 r9:00000000 r8:00000000 r7:00000002
r6:bf206000 r5:bf206000
[ 11.128571] r4:0003e000
[ 11.131126] [<803086f8>] (ubi_eba_read_leb) from [<80307864>]
(ubi_leb_read+0x74/0xc4)
[ 11.139042] r10:c0e3e000 r9:c0e3e000 r8:00000002 r7:00000000
r6:bf206000 r5:be913c00
[ 11.146941] r4:0003e000
[ 11.149498] [<803077f0>] (ubi_leb_read) from [<801da34c>]
(ubifs_leb_read+0x34/0x98)
[ 11.157240] r10:00000002 r9:c0e3e000 r8:00000000 r7:00000002
r6:0003e000 r5:bf1cb000
[ 11.165140] r4:bf1cb000
[ 11.167706] [<801da318>] (ubifs_leb_read) from [<801f1668>]
(get_master_node+0x58/0x1f0)
[ 11.175796] r8:bf1cb000 r7:00001000 r6:be560300 r5:00000000 r4:bf1cb000
[ 11.182575] [<801f1610>] (get_master_node) from [<801f1b0c>]
(ubifs_recover_master_node+0x70/0x2f4)
[ 11.191620] r10:be55eec0 r9:000000a0 r8:00000003 r7:00001000
r6:be560300 r5:00000000
[ 11.199520] r4:bf1cb000
[ 11.202077] [<801f1a9c>] (ubifs_recover_master_node) from
[<801e0f28>] (ubifs_read_master+0x1a4/0x924)
[ 11.211383] r7:00002000 r6:be560300 r5:ffffff8b r4:bf1cb000
[ 11.217106] [<801e0d84>] (ubifs_read_master) from [<801d82c4>]
(ubifs_mount+0xa7c/0x156c)
[ 11.225282] r10:be55eec0 r9:000000a0 r8:bf1cb87c r7:be538000
r6:00000000 r5:bf1cb000
[ 11.233180] r4:bf2da140
[ 11.235735] [<801d7848>] (ubifs_mount) from [<801011ac>] (mount_fs+0x1c/0xa0)
[ 11.242870] r10:be55e000 r9:806f2078 r8:00000000 r7:806f2078
r6:806f2078 r5:00000000
[ 11.250769] r4:801d7848
[ 11.253326] [<80101190>] (mount_fs) from [<80119054>]
(vfs_kern_mount+0x50/0x108)
[ 11.260808] r6:be55e180 r5:00000000 r4:bf1a6cc0
[ 11.265478] [<80119004>] (vfs_kern_mount) from [<8011c354>]
(do_mount+0x9d8/0xb70)
[ 11.273047] r9:806f2078 r8:be55e180 r7:7eeabe14 r6:00000400
r5:806dbc6c r4:00000008
[ 11.280865] [<8011b97c>] (do_mount) from [<8011c72c>] (SyS_mount+0x7c/0xa8)
[ 11.287827] r10:00000000 r9:be4f6000 r8:00000400 r7:7eeabe14
r6:be55e180 r5:be55e000
[ 11.295727] r4:00000000
[ 11.298284] [<8011c6b0>] (SyS_mount) from [<80009bc0>]
(ret_fast_syscall+0x0/0x3c)
[ 11.305853] r8:80009d84 r7:00000015 r6:00027014 r5:7eeabe14 r4:00000000
[ 11.313088] UBIFS error (ubi0:2 pid 629):
ubifs_recover_master_node: failed to recover master node
[ 11.322071] UBIFS error (ubi0:2 pid 629):
ubifs_recover_master_node: dumping first master node
[ 11.330686] magic 0x6101831
[ 11.334361] crc 0xd0feaa12
[ 11.338113] node_type 7 (master node)
[ 11.342310] group_type 0 (no node group)
[ 11.346668] sqnum 272796
[ 11.350071] len 512
[ 11.353226] highest_inum 3500
[ 11.356456] commit number 8967
[ 11.359686] flags 0x3
[ 11.362840] log_lnum 3
[ 11.365809] root_lnum 461
[ 11.368950] root_offs 74096
[ 11.372276] root_len 128
[ 11.375418] gc_lnum 460
[ 11.378559] ihead_lnum 461
[ 11.381701] ihead_offs 77824
[ 11.385026] index_size 210120
[ 11.388429] lpt_lnum 10
[ 11.391483] lpt_offs 94430
[ 11.394809] nhead_lnum 10
[ 11.397865] nhead_offs 98304
[ 11.401180] ltab_lnum 10
[ 11.404246] ltab_offs 94208
[ 11.407561] lsave_lnum 0
[ 11.410529] lsave_offs 0
[ 11.413508] lscan_lnum 460
[ 11.416650] leb_cnt 7820
[ 11.419878] empty_lebs 7705
[ 11.423118] idx_lebs 10
[ 11.426174] total_free 1957130240
[ 11.429925] total_dirty 6846968
[ 11.433425] total_used 18161984
[ 11.437001] total_dead 88160
[ 11.440317] total_dark 63299584
[ 11.443952] UBIFS (ubi0:2): background thread "ubifs_bgt0_2" stops
[ 11.451984] UBIFS (ubi0:2): background thread "ubifs_bgt0_2" started, PID 634
[ 11.474373] ubi0 warning: ubi_io_read: error -74 (ECC error) while
reading 253952 bytes from PEB 2807:8192, read only 253952 bytes, retry
[ 11.497488] ubi0 warning: ubi_io_read: error -74 (ECC error) while
reading 253952 bytes from PEB 2807:8192, read only 253952 bytes, retry
[ 11.520558] ubi0 warning: ubi_io_read: error -74 (ECC error) while
reading 253952 bytes from PEB 2807:8192, read only 253952 bytes, retry
[ 11.543655] ubi0 error: ubi_io_read: error -74 (ECC error) while
reading 253952 bytes from PEB 2807:8192, read 253952 bytes
[ 11.554809] CPU: 1 PID: 626 Comm: mount_root Not tainted 4.4.0 #6
[ 11.560905] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
[ 11.567435] Backtrace:
[ 11.569917] [<8001e674>] (dump_backtrace) from [<8001e86c>]
(show_stack+0x18/0x1c)
[ 11.577489] r7:00000af7 r6:0003e000 r5:60000013 r4:00000000
[ 11.583216] [<8001e854>] (show_stack) from [<80232028>]
(dump_stack+0x84/0xa4)
[ 11.590455] [<80231fa4>] (dump_stack) from [<8030a9c4>]
(ubi_io_read+0x1dc/0x2b0)
[ 11.597938] r5:bf206000 r4:ffffffb6
[ 11.601549] [<8030a7e8>] (ubi_io_read) from [<80308974>]
(ubi_eba_read_leb+0x27c/0x388)
[ 11.609552] r10:be913c00 r9:00000000 r8:00000000 r7:00000002
r6:bf206000 r5:bf206000
[ 11.617453] r4:0003e000
[ 11.620008] [<803086f8>] (ubi_eba_read_leb) from [<80307864>]
(ubi_leb_read+0x74/0xc4)
[ 11.627924] r10:c0e7d000 r9:00000002 r8:00000002 r7:00000000
r6:bf206000 r5:be913c00
[ 11.635823] r4:0003e000
[ 11.638377] [<803077f0>] (ubi_leb_read) from [<801da34c>]
(ubifs_leb_read+0x34/0x98)
[ 11.646120] r10:bf17d680 r9:00000002 r8:00000000 r7:00000002
r6:0003e000 r5:bf210000
[ 11.654019] r4:bf17d240
[ 11.656576] [<801da318>] (ubifs_leb_read) from [<801e19c8>]
(ubifs_start_scan+0x7c/0xf8)
[ 11.664666] r8:00000002 r7:c0e7d000 r6:00000000 r5:bf210000 r4:bf17d240
[ 11.671442] [<801e194c>] (ubifs_start_scan) from [<801e1ccc>]
(ubifs_scan+0x2c/0x330)
[ 11.679271] r8:00000003 r7:0003e000 r6:c0e7d000 r5:00000000 r4:bf210000
[ 11.686046] [<801e1ca0>] (ubifs_scan) from [<801e0e38>]
(ubifs_read_master+0xb4/0x924)
[ 11.693963] r10:bf17d680 r9:000000a0 r8:00000003 r7:00002000
r6:bf17d440 r5:bf17d240
[ 11.701862] r4:bf210000
[ 11.704415] [<801e0d84>] (ubifs_read_master) from [<801d82c4>]
(ubifs_mount+0xa7c/0x156c)
[ 11.712592] r10:bf17d680 r9:000000a0 r8:bf21087c r7:be548400
r6:00000000 r5:bf210000
[ 11.720489] r4:bf2d9300
[ 11.723045] [<801d7848>] (ubifs_mount) from [<801011ac>] (mount_fs+0x1c/0xa0)
[ 11.730180] r10:bf17d180 r9:806f2078 r8:00000000 r7:806f2078
r6:806f2078 r5:00000000
[ 11.738081] r4:801d7848
[ 11.740636] [<80101190>] (mount_fs) from [<80119054>]
(vfs_kern_mount+0x50/0x108)
[ 11.748119] r6:bf17d480 r5:00000000 r4:bf183cc0
[ 11.752788] [<80119004>] (vfs_kern_mount) from [<8011c354>]
(do_mount+0x9d8/0xb70)
[ 11.760356] r9:806f2078 r8:bf17d480 r7:76edc4c5 r6:00000400
r5:806dbc6c r4:00000008
[ 11.768176] [<8011b97c>] (do_mount) from [<8011c72c>] (SyS_mount+0x7c/0xa8)
[ 11.775137] r10:00000000 r9:be588000 r8:00000400 r7:76edc4c5
r6:bf17d480 r5:bf17d180
[ 11.783036] r4:00000000
[ 11.785591] [<8011c6b0>] (SyS_mount) from [<80009bc0>]
(ret_fast_syscall+0x0/0x3c)
[ 11.793160] r8:80009d84 r7:00000015 r6:76eece70 r5:76ebd0e0 r4:00000000
[ 11.823668] ubi0 warning: ubi_io_read: error -74 (ECC error) while
reading 253952 bytes from PEB 2807:8192, read only 253952 bytes, retry
[ 11.847405] ubi0 warning: ubi_io_read: error -74 (ECC error) while
reading 253952 bytes from PEB 2807:8192, read only 253952 bytes, retry
[ 11.871113] ubi0 warning: ubi_io_read: error -74 (ECC error) while
reading 253952 bytes from PEB 2807:8192, read only 253952 bytes, retry
[ 11.894761] ubi0 error: ubi_io_read: error -74 (ECC error) while
reading 253952 bytes from PEB 2807:8192, read 253952 bytes
[ 11.905915] CPU: 1 PID: 626 Comm: mount_root Not tainted 4.4.0 #6
[ 11.912010] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
[ 11.918540] Backtrace:
[ 11.921022] [<8001e674>] (dump_backtrace) from [<8001e86c>]
(show_stack+0x18/0x1c)
[ 11.928593] r7:00000af7 r6:0003e000 r5:60000013 r4:00000000
[ 11.934321] [<8001e854>] (show_stack) from [<80232028>]
(dump_stack+0x84/0xa4)
[ 11.941562] [<80231fa4>] (dump_stack) from [<8030a9c4>]
(ubi_io_read+0x1dc/0x2b0)
[ 11.949044] r5:bf206000 r4:ffffffb6
[ 11.952657] [<8030a7e8>] (ubi_io_read) from [<80308974>]
(ubi_eba_read_leb+0x27c/0x388)
[ 11.960660] r10:be913c00 r9:00000000 r8:00000000 r7:00000002
r6:bf206000 r5:bf206000
[ 11.968559] r4:0003e000
[ 11.971114] [<803086f8>] (ubi_eba_read_leb) from [<80307864>]
(ubi_leb_read+0x74/0xc4)
[ 11.979030] r10:c0f3a000 r9:c0f3a000 r8:00000002 r7:00000000
r6:bf206000 r5:be913c00
[ 11.986929] r4:0003e000
[ 11.989484] [<803077f0>] (ubi_leb_read) from [<801da34c>]
(ubifs_leb_read+0x34/0x98)
[ 11.997227] r10:00000002 r9:c0f3a000 r8:00000000 r7:00000002
r6:0003e000 r5:bf210000
[ 12.005127] r4:bf210000
[ 12.007691] [<801da318>] (ubifs_leb_read) from [<801f1668>]
(get_master_node+0x58/0x1f0)
[ 12.015782] r8:bf210000 r7:00001000 r6:bf17d440 r5:00000000 r4:bf210000
[ 12.022560] [<801f1610>] (get_master_node) from [<801f1b0c>]
(ubifs_recover_master_node+0x70/0x2f4)
[ 12.031606] r10:bf17d680 r9:000000a0 r8:00000003 r7:00001000
r6:bf17d440 r5:00000000
[ 12.039505] r4:bf210000
[ 12.042060] [<801f1a9c>] (ubifs_recover_master_node) from
[<801e0f28>] (ubifs_read_master+0x1a4/0x924)
[ 12.051366] r7:00002000 r6:bf17d440 r5:ffffff8b r4:bf210000
[ 12.057088] [<801e0d84>] (ubifs_read_master) from [<801d82c4>]
(ubifs_mount+0xa7c/0x156c)
[ 12.065264] r10:bf17d680 r9:000000a0 r8:bf21087c r7:be548400
r6:00000000 r5:bf210000
[ 12.073164] r4:bf2d9300
[ 12.075721] [<801d7848>] (ubifs_mount) from [<801011ac>] (mount_fs+0x1c/0xa0)
[ 12.082856] r10:bf17d180 r9:806f2078 r8:00000000 r7:806f2078
r6:806f2078 r5:00000000
[ 12.090756] r4:801d7848
[ 12.093311] [<80101190>] (mount_fs) from [<80119054>]
(vfs_kern_mount+0x50/0x108)
[ 12.100794] r6:bf17d480 r5:00000000 r4:bf183cc0
[ 12.105462] [<80119004>] (vfs_kern_mount) from [<8011c354>]
(do_mount+0x9d8/0xb70)
[ 12.113031] r9:806f2078 r8:bf17d480 r7:76edc4c5 r6:00000400
r5:806dbc6c r4:00000008
[ 12.120852] [<8011b97c>] (do_mount) from [<8011c72c>] (SyS_mount+0x7c/0xa8)
[ 12.127814] r10:00000000 r9:be588000 r8:00000400 r7:76edc4c5
r6:bf17d480 r5:bf17d180
[ 12.135713] r4:00000000
[ 12.138269] [<8011c6b0>] (SyS_mount) from [<80009bc0>]
(ret_fast_syscall+0x0/0x3c)
[ 12.145840] r8:80009d84 r7:00000015 r6:76eece70 r5:76ebd0e0 r4:00000000
[ 12.153108] UBIFS error (ubi0:2 pid 626):
ubifs_recover_master_node: failed to recover master node
[ 12.162093] UBIFS error (ubi0:2 pid 626):
ubifs_recover_master_node: dumping first master node
[ 12.170708] magic 0x6101831
[ 12.174389] crc 0xd0feaa12
[ 12.178140] node_type 7 (master node)
[ 12.182340] group_type 0 (no node group)
[ 12.186699] sqnum 272796
[ 12.190101] len 512
[ 12.193258] highest_inum 3500
[ 12.196492] commit number 8967
[ 12.199722] flags 0x3
[ 12.202877] log_lnum 3
[ 12.205846] root_lnum 461
[ 12.208990] root_offs 74096
[ 12.212319] root_len 128
[ 12.215461] gc_lnum 460
[ 12.218602] ihead_lnum 461
[ 12.221758] ihead_offs 77824
[ 12.225073] index_size 210120
[ 12.228476] lpt_lnum 10
[ 12.231530] lpt_offs 94430
[ 12.234859] nhead_lnum 10
[ 12.237914] nhead_offs 98304
[ 12.241229] ltab_lnum 10
[ 12.244298] ltab_offs 94208
[ 12.247613] lsave_lnum 0
[ 12.250581] lsave_offs 0
[ 12.253562] lscan_lnum 460
[ 12.256705] leb_cnt 7820
[ 12.259933] empty_lebs 7705
[ 12.263174] idx_lebs 10
[ 12.266231] total_free 1957130240
[ 12.269980] total_dirty 6846968
[ 12.273482] total_used 18161984
[ 12.277058] total_dead 88160
[ 12.280374] total_dark 63299584
[ 12.284022] UBIFS (ubi0:2): background thread "ubifs_bgt0_2" stops
[ 12.290714] mount_root: failed to mount -t ubifs /dev/ubi0_2
/tmp/overlay: Invalid argument
[ 12.303451] blk_update_request: I/O error, dev mtdblock0, sector 0
[ 12.313183] blk_update_request: I/O error, dev mtdblock0, sector 0
[ 12.319374] Buffer I/O error on dev mtdblock0, logical block 0,
async page read
[ 12.389844] UBIFS (ubi0:2): background thread "ubifs_bgt0_2" started, PID 638
[ 12.412129] ubi0 warning: ubi_io_read: error -74 (ECC error) while
reading 253952 bytes from PEB 2807:8192, read only 253952 bytes, retry
[ 12.435259] ubi0 warning: ubi_io_read: error -74 (ECC error) while
reading 253952 bytes from PEB 2807:8192, read only 253952 bytes, retry
[ 12.458336] ubi0 warning: ubi_io_read: error -74 (ECC error) while
reading 253952 bytes from PEB 2807:8192, read only 253952 bytes, retry
[ 12.482116] ubi0 error: ubi_io_read: error -74 (ECC error) while
reading 253952 bytes from PEB 2807:8192, read 253952 bytes
...
>> >> The kernel they are using is a bit out of date but does have
>> >> 'gpmi-nand: Handle ECC Errors in erased pages' [1] patch
>> >>
>> >> I'm wondering if the 'unstable bits issue' [2] is still an issue or if
>> >> the UBI/UBFS Documentation is out of date and this has been resolved.
>> >> If it has been resolved, can anyone point me to the patches.
>> >
>> > This issue is highly theoretical and I never actually saw it in the wild.
>> > Every single time someone claimed to suffer from that, it turned out to be
>> > something else. Currently UBI/UBIFS has no counter measurement, for the
>> > said reasons.
>> > This reminds me that we have to update the website...
>> >
>> > So did you verify (with your NAND vendor) that this really is the named
>> > issue?
>> I have no idea if what the user reported is the unstable bits issue
>> but the fact you've never seen it occur in the wild tells me probably
>> not.
>
> I'd be surprised, but you never know. :-)
>
> Just to be sure, this is SLC NAND, right?
No, its a MT29F16G08 16GB MLC
Tim
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