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. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
