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

[qianfan <qianfanguijin@xxxxxxx>]

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.