我有一个ACASIS SATA硬盘盒，还有装有Ubuntu的固态硬盘和装有Arch Linux的机械硬盘。近期从硬盘盒BOOT并更新系统后，两个系统均无法启动，开机时卡在等待根分区这一步。
进入主机Gentoo Linux连接硬盘盒同样无法正确识别，从内核日志观察到 usb-storage 驱动绑定后，只会反复 reset high-speed USB device，无法创建 sg0 和 sda 设备节点。通过手动 echo "- - -" > /sys/class/scsi_host/host0/scan 偶尔能成功，但成功率极低。
通过大量测试，发现以下发行版/内核版本能稳定工作：
- Ubuntu 6.8.0-111
- Ubuntu 6.8.0-117
- Ubuntu 5.15.185-tegra
- Arch 6.17.9-arch1
- Arch 6.17.9-zen1
- Gentoo 6.8.2-zen2 (copy from Arch)
- Gentoo 6.19.9-src
以下发行版/内核版本极大概率创建 sg0 失败：
- Ubuntu 6.8.0-136
- Arch 6.18.39-1-lts
- Arch 6.18.40-2-lts
- Arch 7.1.4-zen1
- Arch 7.1.5-zen1
- Gentoo 6.19.14-src
- Gentoo 7.0.3-src
- Gentoo 7.1.0-src
- Gentoo 7.1.5-src
正常日志如下：
[ 289.767043] usb 3-3: new high-speed USB device number 5 using xhci_hcd
[ 289.900341] usb 3-3: New USB device found, idVendor=2109, idProduct=0715, bcdDevice= 1.67
[ 289.900355] usb 3-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 289.900359] usb 3-3: Product: VLI Product String
[ 289.900362] usb 3-3: Manufacturer: VLI Manufacture String
[ 289.900365] usb 3-3: SerialNumber: ABCDEFA74651
[ 289.905491] scsi host0: uas
[ 290.630695] scsi 0:0:0:0: Direct-Access ACASIS EC-7250 2210 PQ: 0 ANSI: 6
[ 290.635894] sd 0:0:0:0: Attached scsi generic sg0 type 0
[ 290.641425] sd 0:0:0:0: [sda] 976773168 512-byte logical blocks: (500 GB/466 GiB)
[ 290.641434] sd 0:0:0:0: [sda] 4096-byte physical blocks
[ 290.641720] sd 0:0:0:0: [sda] Write Protect is off
[ 290.641724] sd 0:0:0:0: [sda] Mode Sense: 2f 00 00 00
[ 290.642378] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 290.642557] sd 0:0:0:0: [sda] Preferred minimum I/O size 4096 bytes
[ 290.642562] sd 0:0:0:0: [sda] Optimal transfer size 33553920 bytes not a multiple of preferred minimum block size (4096 bytes)
[ 290.709580] sda: sda1 sda4 sda5 sda6 sda7 sda8 sda9 sda10 sda11
[ 290.711485] sd 0:0:0:0: [sda] Attached SCSI disk
故障日志如下：
......
[ 261.359686] usb 3-2: SerialNumber: ABCDEFA74651
[ 261.363200] usb 3-2: UAS is ignored for this device, using usb-storage instead
[ 261.363207] usb-storage 3-2:1.0: USB Mass Storage device detected
[ 261.363610] usb-storage 3-2:1.0: Quirks match for vid 2109 pid 0715: 800000
[ 261.363793] scsi host0: usb-storage 3-2:1.0
[ 283.260355] usb 3-2: reset high-speed USB device number 5 using xhci_hcd
[ 304.254842] usb 3-2: reset high-speed USB device number 5 using xhci_hcd
初步怀疑是4月左右内核引入的BUG。有人碰到过类似情况或了解uas/usb-storage相关的细节吗？