On 08/02/2019 16:49, Bart Van Assche wrote: > Does this problem only occur with block devices backed by the UFS driver > or does this problem also occur with other block drivers? Yes, same issue with a USB3 mass storage device: usb 2-1: new SuperSpeed Gen 1 USB device number 2 using xhci-hcd usb 2-1: New USB device found, idVendor=05dc, idProduct=a838, bcdDevice=11.00 usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 2-1: Product: USB Flash Drive usb 2-1: Manufacturer: Lexar usb 2-1: SerialNumber: AAYW2W7I13BAR0JC usb-storage 2-1:1.0: USB Mass Storage device detected scsi host0: usb-storage 2-1:1.0 scsi 0:0:0:0: Direct-Access Lexar USB Flash Drive 1100 PQ: 0 ANSI: 6 sd 0:0:0:0: [sda] 62517248 512-byte logical blocks: (32.0 GB/29.8 GiB) sd 0:0:0:0: [sda] Write Protect is off sd 0:0:0:0: [sda] Mode Sense: 43 00 00 00 sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA sda: sda1 sd 0:0:0:0: [sda] Attached SCSI removable disk # dd if=/dev/sda of=/dev/null bs=1M status=progress 3879731200 bytes (3.9 GB, 3.6 GiB) copied, 56.0097 s, 69.3 MB/s This definitively rules out drivers/scsi/ufs (Dropping UFS people) So the problem could be in SCSI glue, or block, or mm? How can I pinpoint the bug? Problem statement and logs: https://lore.kernel.org/linux-block/66419195-594c-aa83-c19d-f091ad3b296d@xxxxxxx/ Regards.
