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

[qianfan <qianfanguijin@163.com>]

在 2022/3/28 13:48, OGAWA Hirofumi 写道:
>>> 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.
> This limits the rate of messages. Can you try if a this patch fixes behavior?

Yes, this patch fixed the problem and watchdog doesn't reset again.

Next is the console log when usb storage disconnected:

[  217.265033] musb-hdrc musb-hdrc.0: ep2 RX three-strikes error
[  218.085454] sd 0:0:0:0: [sda] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x07 
driverbyte=DRIVER_OK cmd_age=0s
[  218.095658] sd 0:0:0:0: [sda] tag#0 CDB: opcode=0x28 28 00 00 04 81 d6 00 00 
f0 00
[  218.103611] blk_update_request: I/O error, dev sda, sector 295382 op 
0x0:(READ) flags 0x84700 phys_seg 2 prio class 0
[  218.116414] sd 0:0:0:0: [sda] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x07 
driverbyte=DRIVER_OK cmd_age=0s
[  218.126576] sd 0:0:0:0: [sda] tag#0 CDB: opcode=0x28 28 00 00 04 82 c6 00 00 
10 00
[  218.134582] blk_update_request: I/O error, dev sda, sector 295622 op 
0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
[  218.146542] usb 1-1: USB disconnect, device number 4
[  218.166668] sd 0:0:0:0: [sda] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x07 
driverbyte=DRIVER_OK cmd_age=0s
[  218.176831] sd 0:0:0:0: [sda] tag#0 CDB: opcode=0x28 28 00 00 04 82 d6 00 00 
f0 00
[  218.184864] blk_update_request: I/O error, dev sda, sector 295638 op 
0x0:(READ) flags 0x84700 phys_seg 2 prio class 0
[  218.196996] blk_update_request: I/O error, dev sda, sector 295878 op 
0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
[  218.208339] blk_update_request: I/O error, dev sda, sector 295382 op 
0x0:(READ) flags 0x0 phys_seg 1 prio class 0
cp: read error: Input/output error
# [  218.253995] FAT-fs (sda1): FAT read failed (blocknr 1130)

'FAT read failed' error message printed only once.

Interesting.

>
> Thanks.