AM335x crc32 oops ?
From: Mark Jackson
Date: Fri Mar 15 2013 - 07:03:35 EST
Apologies for the long email ...
Following on from another thread, I have encountered an issue with crc32 within
the mtd system, seemingly only on my AM335x cpu board.
In function ubi_eba_atomic_leb_change() in drivers/mtd/ubi/eba.c, there is a call
to crc32.
During a remount of my ubifs volume, ubi_eba_atomic_leb_change() is called several
times, with crc32 happening at various points.
Most of the time, the crc length is 2048 bytes, but when a large crc is required
(in my case 122880 bytes), I get an oops.
# mount -o remount,rw /
[ 24.609350] UBIFS: start fixing up free space
[ 24.627010] uealc crc32 : d08cb000 2048
[ 24.643019] uealc crc32 : d08cb000 2048
[ 24.661278] uealc crc32 : d08cb000 2048
[ 24.680505] uealc crc32 : d08cb000 2048
[ 24.743176] uealc crc32 : d08cb000 122880
[ 24.747581] Unable to handle kernel paging request at virtual address e7938204
[ 24.755199] pgd = cf408000
[ 24.758052] [e7938204] *pgd=00000000
[ 24.761833] Internal error: Oops: 5 [#1] ARM
[ 24.766342] CPU: 0 Not tainted (3.8.0-next-20130225-00002-g678576f-dirty #45)
[ 24.774248] PC is at crc32_le+0xf8/0x168
[ 24.778389] LR is at ubi_eba_atomic_leb_change+0x1d8/0x460
[ 24.784177] pc : [<c01e734c>] lr : [<c026de20>] psr: 20000013
[ 24.784177] sp : cf359e10 ip : 00003145 fp : c054f840
[ 24.796285] r10: e7938104 r9 : c054fc40 r8 : af5e2a9e
[ 24.801796] r7 : e59f3038 r6 : e59f0040 r5 : 00000040 r4 : 000000e5
[ 24.808682] r3 : c054e040 r2 : 00000000 r1 : d08d05d0 r0 : 3e5ed77d
[ 24.815570] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
[ 24.823097] Control: 10c5387d Table: 8f408019 DAC: 00000015
[ 24.829160] Process mount (pid: 659, stack limit = 0xcf358238)
[ 24.835313] Stack: (0xcf359e10 to 0xcf35a000)
[ 24.839912] 9e00: d08cb000 00000000 d08caffc 00003c00
[ 24.848543] 9e20: cf2f8000 00000000 cf2ec000 cf32da00 cf2f8554 00000000 0000000c d08cb000
[ 24.857173] 9e40: d08cb000 c059f1f6 cf32da00 00000000 00000000 00000000 00000000 0001e000
[ 24.865803] 9e60: cf32e000 0000000c d08cb000 00000080 0000000c cf3c8f88 00000000 00000020
[ 24.874435] 9e80: 00008000 c026c47c 0001e000 cf359e9c cf32e000 d08cb000 0001e000 c0179b80
[ 24.883066] 9ea0: cf390c80 00000001 0001e000 cf32e000 00000000 cf32eb20 0000000c c01796f0
[ 24.891698] 9ec0: cf32e000 00000000 cf32ea9c 00000000 cf359f48 c0175170 00000001 60000013
[ 24.900329] 9ee0: cf326800 00000000 00000000 00000000 cf359f48 00000000 00000020 c00c9e24
[ 24.908963] 9f00: 00100100 00200200 cf390c80 00008000 cf358000 00208020 00000000 cf01a200
[ 24.917595] 9f20: cf326800 c00e3d6c 00000000 0000000c cf326840 00000000 c0013968 cf3c4680
[ 24.926227] 9f40: 0000000c 00000000 cf01a210 ce828858 0000000c cf3a4000 000a18b4 00000000
[ 24.934859] 9f60: 00208020 c0013968 cf358000 00000000 00000003 c00e3e40 00000000 c0071e24
[ 24.943491] 9f80: 00000000 00000000 cf3c4680 cf314540 a0000010 00000000 be984b68 b6fbc48c
[ 24.952124] 9fa0: 00000015 c00137c0 00000000 be984b68 000a18b4 000a18c0 000a18c2 00208020
[ 24.960757] 9fc0: 00000000 be984b68 b6fbc48c 00000015 00000000 00000000 00000000 00000003
[ 24.969391] 9fe0: b6f6ef48 be984a64 00042994 b6f6ef58 a0000010 000a18b4 ebfecd47 00095348
[ 24.978033] [<c01e734c>] (crc32_le+0xf8/0x168) from [<d08cb000>] (0xd08cb000)
[ 24.985570] Code: 0a000008 e59da008 e28a1003 e5f1c001 (e2522001)
[ 24.992006] ---[ end trace 1496ae984fb21f1a ]---
I did some further testing, and, when the 122880 byte crc is about to run, I performed multiple
crc's on the same buffer but with increasing sizes:-
# mount -o remount,rw /
[ 19.208302] UBIFS: start fixing up free space
[ 19.230271] uealc crc32 : ** starting 122880 byte test **
[ 19.235881] uealc crc32 : d08cb000 2048
[ 19.240015] uealc crc32 : d08cb000 4096
[ 19.244091] uealc crc32 : d08cb000 8192
[ 19.248184] uealc crc32 : d08cb000 16384
[ 19.252448] uealc crc32 : d08cb000 32768
[ 19.256772] uealc crc32 : d08cb000 65536
[ 19.260133] uealc crc32 : d08cb000 122880
[ 19.261117] Unable to handle kernel paging request at virtual address e79381bc
[ 19.268741] pgd = cf40c000
[ 19.271598] [e79381bc] *pgd=00000000
[ 19.275387] Internal error: Oops: 5 [#1] ARM
[ 19.279902] CPU: 0 Not tainted (3.8.0-next-20130225-00002-g678576f-dirty #47)
[ 19.287819] PC is at crc32_le+0xf8/0x168
[ 19.291965] LR is at ubi_eba_atomic_leb_change+0x3ac/0x4f8
[ 19.297760] pc : [<c01e724c>] lr : [<c026def4>] psr: 20000013
[ 19.297760] sp : cf3bbe08 ip : 00000e4e fp : c054f840
[ 19.309882] r10: e7938104 r9 : c054fc40 r8 : 65e95c1c
[ 19.315396] r7 : 322e315f r6 : 352e332e r5 : 0000002e r4 : 00000035
[ 19.322288] r3 : c054e040 r2 : 00000033 r1 : d08d3d90 r0 : 63c3884e
[ 19.329180] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
[ 19.336713] Control: 10c5387d Table: 8f40c019 DAC: 00000015
[ 19.342781] Process mount (pid: 659, stack limit = 0xcf3ba238)
[ 19.348939] Stack: (0xcf3bbe08 to 0xcf3bc000)
[ 19.353542] be00: cf2f8554 00000000 d08caffc 00002000 cf2f8000 cf357a00
[ 19.362183] be20: 00000000 0000000c cf2ec000 00000000 0000000c cf2f8554 00000000 00000000
[ 19.370823] be40: d08cb000 d08cb000 00000000 07000000 00008000 c026c168 00000000 0001e000
[ 19.379463] be60: 00000000 0000000c d08cb000 00000080 0000000c cf3bbf48 00000000 00000020
[ 19.388101] be80: 00008000 c026c37c 0001e000 cf330000 cf330000 d08cb000 0001e000 c0179a78
[ 19.396738] bea0: 0000000d c0177a68 0001e000 cf330000 00000000 cf330b20 0000000d c01794b4
[ 19.405376] bec0: 00000000 cf330000 00000000 cf330a9c 00000000 c0175170 00000001 60000013
[ 19.414012] bee0: cf32c800 00000000 00000000 00000000 cf3bbf48 00000000 00000020 c00c9e24
[ 19.422648] bf00: 00100100 00200200 cf390300 00008000 cf3ba000 00208020 00000000 cf01a200
[ 19.431284] bf20: cf32c800 c00e3d6c 00000000 0000000c cf32c840 00000000 c0013968 cf325800
[ 19.439921] bf40: 0000000c 00000000 cf01a210 ce828858 0000000c cf053000 000a18b4 00000000
[ 19.448559] bf60: 00208020 c0013968 cf3ba000 00000000 00000003 c00e3e40 00000000 c0071e24
[ 19.457197] bf80: 00000000 00000000 cf325800 cf328380 a0000010 00000000 beb83b68 b6f8348c
[ 19.465838] bfa0: 00000015 c00137c0 00000000 beb83b68 000a18b4 000a18c0 000a18c2 00208020
[ 19.474475] bfc0: 00000000 beb83b68 b6f8348c 00000015 00000000 00000000 00000000 00000003
[ 19.483108] bfe0: b6f35f48 beb83a64 00042994 b6f35f58 a0000010 000a18b4 00000000 00000000
[ 19.491758] [<c01e724c>] (crc32_le+0xf8/0x168) from [<00000000>] ( (null))
[ 19.499115] Code: 0a000008 e59da008 e28a1003 e5f1c001 (e2522001)
[ 19.505555] ---[ end trace 84a04423f0bc8388 ]---
And then with finer size increases:-
# mount -o remount,rw /
[ 25.161875] UBIFS: start fixing up free space
[ 25.185334] uealc crc32 : ** starting 122880 byte test **
[ 25.189572] uealc crc32 : d08cb000 1024
[ 25.193653] uealc crc32 : d08cb000 2048
[ 25.197709] uealc crc32 : d08cb000 3072
[ 25.201819] uealc crc32 : d08cb000 4096
[ 25.205886] uealc crc32 : d08cb000 5120
[ 25.209982] uealc crc32 : d08cb000 6144
[ 25.214054] uealc crc32 : d08cb000 7168
[ 25.218129] uealc crc32 : d08cb000 8192
[ 25.222238] uealc crc32 : d08cb000 9216
[ 25.226323] uealc crc32 : d08cb000 10240
[ 25.230528] uealc crc32 : d08cb000 11264
[ 25.234711] uealc crc32 : d08cb000 12288
[ 25.238928] uealc crc32 : d08cb000 13312
[ 25.243119] uealc crc32 : d08cb000 14336
[ 25.247313] uealc crc32 : d08cb000 15360
[ 25.251541] uealc crc32 : d08cb000 16384
[ 25.255744] uealc crc32 : d08cb000 17408
[ 25.259982] uealc crc32 : d08cb000 18432
[ 25.264193] uealc crc32 : d08cb000 19456
[ 25.268406] uealc crc32 : d08cb000 20480
[ 25.272657] uealc crc32 : d08cb000 21504
[ 25.276881] uealc crc32 : d08cb000 22528
[ 25.281136] uealc crc32 : d08cb000 23552
[ 25.285367] uealc crc32 : d08cb000 24576
[ 25.289633] uealc crc32 : d08cb000 25600
[ 25.293873] uealc crc32 : d08cb000 26624
[ 25.298115] uealc crc32 : d08cb000 27648
[ 25.302394] uealc crc32 : d08cb000 28672
[ 25.306644] uealc crc32 : d08cb000 29696
[ 25.310928] uealc crc32 : d08cb000 30720
[ 25.315188] uealc crc32 : d08cb000 31744
[ 25.319485] uealc crc32 : d08cb000 32768
[ 25.323753] uealc crc32 : d08cb000 33792
[ 25.328025] uealc crc32 : d08cb000 34816
[ 25.332331] uealc crc32 : d08cb000 35840
[ 25.336612] uealc crc32 : d08cb000 36864
[ 25.340924] uealc crc32 : d08cb000 37888
[ 25.345212] uealc crc32 : d08cb000 38912
[ 25.349538] uealc crc32 : d08cb000 39936
[ 25.353837] uealc crc32 : d08cb000 40960
[ 25.358138] uealc crc32 : d08cb000 41984
[ 25.362481] uealc crc32 : d08cb000 43008
[ 25.366794] uealc crc32 : d08cb000 44032
[ 25.371140] uealc crc32 : d08cb000 45056
[ 25.375462] uealc crc32 : d08cb000 46080
[ 25.379823] uealc crc32 : d08cb000 47104
[ 25.384155] uealc crc32 : d08cb000 48128
[ 25.388490] uealc crc32 : d08cb000 49152
[ 25.392862] uealc crc32 : d08cb000 50176
[ 25.397207] uealc crc32 : d08cb000 51200
[ 25.401583] uealc crc32 : d08cb000 52224
[ 25.405936] uealc crc32 : d08cb000 53248
[ 25.410326] uealc crc32 : d08cb000 54272
[ 25.414688] uealc crc32 : d08cb000 55296
[ 25.419084] uealc crc32 : d08cb000 56320
[ 25.423455] uealc crc32 : d08cb000 57344
[ 25.427827] uealc crc32 : d08cb000 58368
[ 25.432238] uealc crc32 : d08cb000 59392
[ 25.436621] uealc crc32 : d08cb000 60416
[ 25.441033] uealc crc32 : d08cb000 61440
[ 25.445423] uealc crc32 : d08cb000 62464
[ 25.449852] uealc crc32 : d08cb000 63488
[ 25.454254] uealc crc32 : d08cb000 64512
[ 25.458658] uealc crc32 : d08cb000 65536
[ 25.463097] uealc crc32 : d08cb000 66560
[ 25.467508] uealc crc32 : d08cb000 67584
[ 25.471953] uealc crc32 : d08cb000 68608
[ 25.476372] uealc crc32 : d08cb000 69632
[ 25.480823] uealc crc32 : d08cb000 70656
[ 25.485251] uealc crc32 : d08cb000 71680
[ 25.489712] uealc crc32 : d08cb000 72704
[ 25.494147] uealc crc32 : d08cb000 73728
[ 25.498584] uealc crc32 : d08cb000 74752
[ 25.503058] uealc crc32 : d08cb000 75776
[ 25.507505] uealc crc32 : d08cb000 76800
[ 25.511988] uealc crc32 : d08cb000 77824
[ 25.516443] uealc crc32 : d08cb000 78848
[ 25.520935] uealc crc32 : d08cb000 79872
[ 25.525399] uealc crc32 : d08cb000 80896
[ 25.529899] uealc crc32 : d08cb000 81920
[ 25.534369] uealc crc32 : d08cb000 82944
[ 25.538876] uealc crc32 : d08cb000 83968
[ 25.543359] uealc crc32 : d08cb000 84992
[ 25.547844] uealc crc32 : d08cb000 86016
[ 25.552366] uealc crc32 : d08cb000 87040
[ 25.556859] uealc crc32 : d08cb000 88064
[ 25.561383] uealc crc32 : d08cb000 89088
[ 25.565885] uealc crc32 : d08cb000 90112
[ 25.570423] uealc crc32 : d08cb000 91136
[ 25.574935] uealc crc32 : d08cb000 92160
[ 25.579479] uealc crc32 : d08cb000 93184
[ 25.583997] uealc crc32 : d08cb000 94208
[ 25.588517] uealc crc32 : d08cb000 95232
[ 25.593115] uealc crc32 : d08cb000 96256
[ 25.597648] uealc crc32 : d08cb000 97280
[ 25.602226] uealc crc32 : d08cb000 98304
[ 25.606766] uealc crc32 : d08cb000 99328
[ 25.611340] uealc crc32 : d08cb000 100352
[ 25.615978] uealc crc32 : d08cb000 101376
[ 25.620652] uealc crc32 : d08cb000 102400
[ 25.625300] uealc crc32 : d08cb000 103424
[ 25.629984] uealc crc32 : d08cb000 104448
[ 25.634637] uealc crc32 : d08cb000 105472
[ 25.639325] uealc crc32 : d08cb000 106496
[ 25.643988] uealc crc32 : d08cb000 107520
[ 25.648650] uealc crc32 : d08cb000 108544
[ 25.653370] uealc crc32 : d08cb000 109568
[ 25.658047] uealc crc32 : d08cb000 110592
[ 25.662764] uealc crc32 : d08cb000 111616
[ 25.667449] uealc crc32 : d08cb000 112640
[ 25.672168] uealc crc32 : d08cb000 113664
[ 25.676858] uealc crc32 : d08cb000 114688
[ 25.681581] uealc crc32 : d08cb000 115712
[ 25.686276] uealc crc32 : d08cb000 116736
[ 25.691010] uealc crc32 : d08cb000 117760
[ 25.695717] uealc crc32 : d08cb000 118784
[ 25.700462] uealc crc32 : d08cb000 119808
[ 25.705177] uealc crc32 : d08cb000 120832
[ 25.709929] uealc crc32 : d08cb000 121856
[ 25.714654] uealc crc32 : d08cb000 122880
[ 25.719414] uealc crc x
[ 27.527375] UBIFS: free space fixup complete
[ 27.550760] UBIFS: background thread "ubifs_bgt0_0" started, PID 660
So it seems time related (??) in that if I do more testing before checking the full 122880
byte buffer, the crc works.
But if the buffer gets crc-ed too quickly, I get an oops.
Does anyone have *any* idea what's going on ?
Cheers
Mark J.
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