开发板，通过usb接口外接ssd硬盘，在硬盘写大数据，每个文件512MB(一个文件到了512M是关闭，开下一个文件继续写入)，连续写，出现如下错误，出现的时间不固定，文件系统为ext4和btrfs都测试过
[ 518.065614] xhci-hcd xhci-hcd.0.auto: xHCI host not responding to stop endpoint command.
[ 518.073777] xhci-hcd xhci-hcd.0.auto: Assuming host is dying, halting host.
[ 518.100982] xhci-hcd xhci-hcd.0.auto: HC died; cleaning up
[ 518.106652] usb 2-1: USB disconnect, device number 2
[ 518.175734] sd 0:0:0:0: [sda] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x01 driverbyte=0x00
[ 518.175747] sd 0:0:0:0: [sda] tag#0 CDB: opcode=0x2a 2a 00 00 23 97 c0 00 00 80 00
[ 518.175757] blk_update_request: I/O error, dev sda, sector 2332608
[ 518.198111] EXT4-fs warning (device sda1): ext4_end_bio:329: I/O error -5 writing to inode 13 (offset 981467136 size 8388608 starting block 291336)
[ 518.211401] Buffer I/O error on device sda1, logical block 291328
2017 Mar 30 10:13:44 k2hk-evm [ [ 518.211432] Buffer I/O error on device sda1, logical block 291329
518.216261] EXT[ 518.211441] Buffer I/O error on device sda1, logical block 291330
[ 518.211448] Buffer I/O error on device sda1, logical block 291331
4-fs error (devi[ 518.211455] Buffer I/O error on device sda1, logical block 291332
[ 518.211461] Buffer I/O error on device sda1, logical block 291333
ce sda1) in ext4[ 518.211470] Buffer I/O error on device sda1, logical block 291334
[ 518.211477] Buffer I/O error on device sda1, logical block 291335
[ 518.211483] Buffer I/O error on device sda1, logical block 291336
[ 518.211488] Buffer I/O error on device sda1, logical block 291337
[ 518.212663] sd 0:0:0:0: [sda] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x01 driverbyte=0x00
[ 518.212677] sd 0:0:0:0: [sda] tag#0 CDB: opcode=0x2a 2a 00 00 23 98 40 00 00 f0 00
[ 518.212691] blk_update_request: I/O error, dev sda, sector 2332736
