Re: linux resetting when the usb storage was removed while copying

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在 2022/3/22 15:21, OGAWA Hirofumi 写道:
qianfan <qianfanguijin@xxxxxxx> writes:

Hi:

I am tesing usb storage on linux v5.15, found that the system is resetting when the
usb storage(fat32 format) was removed while copying. Besides my custom board
has a gpio-watchdog with 1.6s timeout.
Looks like I/O error by unplugging usb while reading data pages for
readahead, then your watchdog detected some state to reset system.

If you disabled watchdog, it works as normal soon or later? If so, FAT
would not be able to do much (maybe ratelimit I/O error to mitigate
serial console overhead), request is from userspace or upper layer in
kernel.

I had changed console to ttynull and the system doesn't reset again.  kernel driver generate lots of error messages when usb storage is disconnected:

$ dmesg | grep 'FAT read failed' | wc -l

608

usb storage can work again when reconnected.

The gpio watchdog depends on hrtimer, maybe printk in ISR delayed hrtimer that cause watchdog reset.


Thanks.

Next is the console(ttyS0, 115200) logs when usb disconnected:

[   62.213788] usb 1-1: USB disconnect, device number 2
[   62.221589] blk_update_request: I/O error, dev sda, sector 16447 op 0x1:(WRITE)
flags 0x100000 phys_seg 1 prio class 0
[   62.232990] Buffer I/O error on dev sda1, logical block 16385, lost async page
write
[   62.266159] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.271985] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.277828] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.283520] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.289219] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.294930] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.300595] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.306286] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.311964] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.317678] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.323376] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.329078] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.334773] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.340437] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.346139] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.351818] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.357506] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.363184] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.368872] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.374568] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.380233] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.385944] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.391623] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.397309] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.402987] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.408679] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.414384] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.420052] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.425746] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.431424] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.437120] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.442798] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.448501] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.454181] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.459869] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.465558] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.471224] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.476918] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.482598] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.488291] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.493970] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.499670] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.505362] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.511026] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.516715] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.522394] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.528084] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.533762] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.539448] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.545140] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.550804] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.556492] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.562170] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.567861] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.573541] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.579231] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.584923] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.590587] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.596277] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.601955] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.607653] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.613332] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.619018] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.624710] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.630393] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.636086] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.641763] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.647449] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.653127] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.658812] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.664503] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.670167] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.675857] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.681540] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.687227] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.692905] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.698590] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.704268] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.709953] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.715667] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.721333] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.727026] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.732709] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.738396] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.744074] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.749761] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.755451] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.761115] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.766806] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.772485] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.778172] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.783854] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.789540] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.795231] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.800896] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.806601] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.812281] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.817968] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.823646] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.829345] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.835043] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.840710] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.846400] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.852078] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.857766] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.863445] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.869130] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.874822] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.880487] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.886189] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.891869] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.897555] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.903234] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.908919] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.914610] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.920274] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.925963] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.931642] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.937344] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.943023] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.948710] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.954401] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.960065] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.965754] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.971431] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.977116] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.982797] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.988489] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.994168] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   62.999853] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.005541] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.011205] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.016895] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.022573] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.028258] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.033937] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.039635] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.045344] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.051009] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.056700] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.062378] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.068064] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.073742] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.079427] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.085121] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.090813] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.096505] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.102183] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.107869] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.113547] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.119243] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.124943] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.130607] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.136299] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.141982] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.147679] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.153358] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.159057] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.164749] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.170413] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.176112] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.181789] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.187477] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.193158] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.198851] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.204544] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.210208] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.215897] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.221575] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.227260] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.232937] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.238625] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.244325] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.249991] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.255681] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.261345] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.267047] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.272728] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.278415] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.284094] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.289787] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.295484] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.301149] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.306839] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.312516] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.318200] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.323877] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.329563] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.335253] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.340919] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.346612] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.352290] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.357975] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.363653] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.369338] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.375041] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.380706] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.386395] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.392074] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.397765] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.403444] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.409130] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.414820] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.420485] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.426173] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.431850] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.437535] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.443214] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.448911] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.454604] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.460268] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.465957] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.471635] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.477321] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.482998] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.488694] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.494388] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.500058] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.505748] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.511425] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.517110] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.522788] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.528474] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.534152] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.539836] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.545525] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.551194] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.556884] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.562562] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.568247] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.573925] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.579610] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.585301] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.590966] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.596667] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.602350] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.608037] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.613715] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.619400] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.625091] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.630755] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.636445] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.642122] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.647809] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.653491] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.659178] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.664868] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.670532] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.676229] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.681908] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.687594] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.693275] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.698961] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.704668] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.710333] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.716024] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.721701] FAT-fs (sda1): FAT read failed (blocknr 1162)
[   63.727387▒
U-Boot SPL 2022.01-rc1-00183-gfa5b4e2d19 (Feb 24 2022 - 15:48:38 +0800)
Trying to boot from NAND

I add a backtrace on function "fat_ent_bread", next is the stack:

[   62.129550] usb 1-1: USB disconnect, device number 2
[   62.137279] blk_update_request: I/O error, dev sda, sector 16447 op 0x1:(WRITE)
flags 0x100000 phys_seg 1 prio class 0
[   62.148725] Buffer I/O error on dev sda1, logical block 16385, lost async page
write
[   62.179800] ------------[ cut here ]------------
[   62.184749] WARNING: CPU: 0 PID: 362 at fs/fat/fatent.c:110
fat_ent_bread+0xec/0x104
[   62.193072] fat_ent_bread
[   62.193081] Modules linked in:
[   62.199103] CPU: 0 PID: 362 Comm: gzip Not tainted
5.15.0-00013-g0ccd7df8f5ad-dirty #132
[   62.207610] Hardware name: Generic AM33XX (Flattened Device Tree)
[   62.214024] [<c0111438>] (unwind_backtrace) from [<c010b9f4>]
(show_stack+0x10/0x14)
[   62.222186] [<c010b9f4>] (show_stack) from [<c0adc214>]
(dump_stack_lvl+0x40/0x4c)
[   62.230165] [<c0adc214>] (dump_stack_lvl) from [<c0136264>]
(__warn+0xf0/0x104)
[   62.237858] [<c0136264>] (__warn) from [<c01362ec>]
(warn_slowpath_fmt+0x74/0xbc)
[   62.245722] [<c01362ec>] (warn_slowpath_fmt) from [<c042cdd0>]
(fat_ent_bread+0xec/0x104)
[   62.254321] [<c042cdd0>] (fat_ent_bread) from [<c042d4f8>]
(fat_ent_read+0x1c8/0x258)
[   62.262550] [<c042d4f8>] (fat_ent_read) from [<c0428b48>]
(fat_get_cluster+0x214/0x394)
[   62.270982] [<c0428b48>] (fat_get_cluster) from [<c0428d70>]
(fat_get_mapped_cluster+0xa8/0x190)
[   62.280221] [<c0428d70>] (fat_get_mapped_cluster) from [<c0431cf8>]
(fat_get_block+0x60/0x310)
[   62.289277] [<c0431cf8>] (fat_get_block) from [<c033622c>]
(do_mpage_readpage+0x298/0x92c)
[   62.297973] [<c033622c>] (do_mpage_readpage) from [<c0336960>]
(mpage_readahead+0xa0/0x154)
[   62.306751] [<c0336960>] (mpage_readahead) from [<c02725d4>]
(read_pages+0x80/0x244)
[   62.314878] [<c02725d4>] (read_pages) from [<c02728f0>]
(page_cache_ra_unbounded+0x158/0x210)
[   62.323818] [<c02728f0>] (page_cache_ra_unbounded) from [<c02628e4>]
(filemap_readahead+0x64/0x8c)
[   62.333222] [<c02628e4>] (filemap_readahead) from [<c0268024>]
(filemap_read+0x55c/0x9f4)
[   62.341802] [<c0268024>] (filemap_read) from [<c02e69d0>]
(vfs_read+0x278/0x2f8)
[   62.349573] [<c02e69d0>] (vfs_read) from [<c02e6f08>]
(ksys_read+0xa8/0xd8)
[   62.356878] [<c02e6f08>] (ksys_read) from [<c0100080>]
(ret_fast_syscall+0x0/0x48)
[   62.364818] Exception stack(0xc2b8dfa8 to 0xc2b8dff0)
[   62.370116] dfa0:                   00000000 00000000 00000000 004f1144 00003ffc
ffffffff
[   62.378685] dfc0: 00000000 00000000 004f1144 00000003 004ee6bc 00000009
00000004 6232e5a0
[   62.387252] dfe0: 00000000 be973b4c 0041ea7c b6ec2af8
[   62.392732] ---[ end trace 28fb7741fb0db033 ]---

I can't detect wether this problem is caused by fat(maybe fs) or usb.

Thanks.





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