I'm having a similar issue on Ubuntu 20.04; from lspci:

Right, my device is:

6c:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5260 PCI Express Card Reader (rev 01)

It looks exactly like yours.

So I guess it's a problem with the driver?

Some more debugging information for the record.

lspci

00:00.0 Host bridge: Intel Corporation 10th Gen Core Processor Host Bridge/DRAM Registers (rev 02)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor PCIe Controller (x16) (rev 02)
00:02.0 VGA compatible controller: Intel Corporation UHD Graphics (rev 05)
00:04.0 Signal processing controller: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem (rev 02)
00:08.0 System peripheral: Intel Corporation Xeon E3-1200 v5/v6 / E3-1500 v5 / 6th/7th/8th Gen Core Processor Gaussian Mixture Model
00:12.0 Signal processing controller: Intel Corporation Comet Lake PCH Thermal Controller
00:13.0 Serial controller: Intel Corporation Device 06fc
00:14.0 USB controller: Intel Corporation Comet Lake USB 3.1 xHCI Host Controller
00:14.2 RAM memory: Intel Corporation Comet Lake PCH Shared SRAM
00:14.3 Network controller: Intel Corporation Wi-Fi 6 AX201
00:15.0 Serial bus controller [0c80]: Intel Corporation Comet Lake PCH Serial IO I2C Controller #0
00:15.1 Serial bus controller [0c80]: Intel Corporation Comet Lake PCH Serial IO I2C Controller #1
00:16.0 Communication controller: Intel Corporation Comet Lake HECI Controller
00:17.0 RAID bus controller: Intel Corporation Device 06d7
00:1c.0 PCI bridge: Intel Corporation Device 06b8 (rev f0)
00:1c.6 PCI bridge: Intel Corporation Device 06be (rev f0)
00:1e.0 Communication controller: Intel Corporation Comet Lake PCH Serial IO UART Host Controller #0
00:1f.0 ISA bridge: Intel Corporation Device 068e
00:1f.3 Audio device: Intel Corporation Comet Lake PCH cAVS
00:1f.4 SMBus: Intel Corporation Comet Lake PCH SMBus Controller
00:1f.5 Serial bus controller [0c80]: Intel Corporation Comet Lake PCH SPI Controller
01:00.0 3D controller: NVIDIA Corporation TU117M [GeForce GTX 1650 Ti Mobile] (rev a1)
02:00.0 PCI bridge: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 4C 2018] (rev 06)
03:00.0 PCI bridge: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 4C 2018] (rev 06)
03:01.0 PCI bridge: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 4C 2018] (rev 06)
03:02.0 PCI bridge: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 4C 2018] (rev 06)
03:04.0 PCI bridge: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 4C 2018] (rev 06)
04:00.0 System peripheral: Intel Corporation JHL7540 Thunderbolt 3 NHI [Titan Ridge 4C 2018] (rev 06)
38:00.0 USB controller: Intel Corporation JHL7540 Thunderbolt 3 USB Controller [Titan Ridge 4C 2018] (rev 06)
6c:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5260 PCI Express Card Reader (rev 01)

and dmesg:

[ 2228.255730] usb 4-1.2.1.4: USB disconnect, device number 8
[ 6989.721677] usb 4-1.2.4.1: new SuperSpeed Gen 1 USB device number 9 using xhci_hcd
[ 6989.742686] usb 4-1.2.4.1: New USB device found, idVendor=0781, idProduct=5583, bcdDevice= 1.00
[ 6989.742691] usb 4-1.2.4.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 6989.742694] usb 4-1.2.4.1: Product: Ultra Fit
[ 6989.742697] usb 4-1.2.4.1: Manufacturer: SanDisk
[ 6989.742700] usb 4-1.2.4.1: SerialNumber: 4C530001191224103251
[ 6989.744492] usb-storage 4-1.2.4.1:1.0: USB Mass Storage device detected
[ 6989.744807] scsi host16: usb-storage 4-1.2.4.1:1.0
[ 6990.754571] scsi 16:0:0:0: Direct-Access     SanDisk  Ultra Fit        1.00 PQ: 0 ANSI: 6
[ 6990.755863] sd 16:0:0:0: [sda] 120127488 512-byte logical blocks: (61.5 GB/57.3 GiB)
[ 6990.756774] sd 16:0:0:0: [sda] Write Protect is off
[ 6990.756779] sd 16:0:0:0: [sda] Mode Sense: 43 00 00 00
[ 6990.757087] sd 16:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[ 6990.802354]  sda: sda1
[ 6990.805043] sd 16:0:0:0: [sda] Attached SCSI removable disk
[ 6992.066133] usb 1-4.2.4-port4: Cannot enable. Maybe the USB cable is bad?
[ 6992.938203] usb 1-4.2.4-port4: Cannot enable. Maybe the USB cable is bad?
[ 6992.938608] usb 1-4.2.4-port4: attempt power cycle
[ 7039.620339] usbcore: deregistering interface driver r8152
[ 7039.830157] usb 4-1.1: reset SuperSpeed Gen 1 USB device number 7 using xhci_hcd
[ 7039.853758] r8152 4-1.1:1.0: firmware: failed to load rtl_nic/rtl8153a-3.fw (-2)
[ 7039.853760] r8152 4-1.1:1.0: Direct firmware load for rtl_nic/rtl8153a-3.fw failed with error -2
[ 7039.853761] r8152 4-1.1:1.0: unable to load firmware patch rtl_nic/rtl8153a-3.fw (-2)
[ 7039.853891] r8152 4-1.1:1.0 (unnamed net_device) (uninitialized): Using pass-thru MAC addr c0:3e:ba:b1:8c:7c
[ 7039.882532] r8152 4-1.1:1.0 eth0: v1.11.11
[ 7039.882595] usbcore: registered new interface driver r8152
[ 7039.884970] r8152 4-1.1:1.0 enxc03ebab18c7c: renamed from eth0
[ 7048.036322] usb 4-1.2.4.1: USB disconnect, device number 9
[ 7096.461674] usb 4-1.2.4.1: new SuperSpeed Gen 1 USB device number 10 using xhci_hcd
[ 7096.482716] usb 4-1.2.4.1: New USB device found, idVendor=0781, idProduct=5583, bcdDevice= 1.00
[ 7096.482721] usb 4-1.2.4.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 7096.482724] usb 4-1.2.4.1: Product: Ultra Fit
[ 7096.482726] usb 4-1.2.4.1: Manufacturer: SanDisk
[ 7096.482728] usb 4-1.2.4.1: SerialNumber: 4C530001191224103251
[ 7096.484443] usb-storage 4-1.2.4.1:1.0: USB Mass Storage device detected
[ 7096.484773] scsi host16: usb-storage 4-1.2.4.1:1.0
[ 7097.505991] scsi 16:0:0:0: Direct-Access     SanDisk  Ultra Fit        1.00 PQ: 0 ANSI: 6
[ 7097.506575] sd 16:0:0:0: [sda] 120127488 512-byte logical blocks: (61.5 GB/57.3 GiB)
[ 7097.507301] sd 16:0:0:0: [sda] Write Protect is off
[ 7097.507302] sd 16:0:0:0: [sda] Mode Sense: 43 00 00 00
[ 7097.507528] sd 16:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[ 7097.547121]  sda: sda1
[ 7097.548758] sd 16:0:0:0: [sda] Attached SCSI removable disk
[ 7098.817887] usb 1-4.2.4-port4: Cannot enable. Maybe the USB cable is bad?
[ 7099.689986] usb 1-4.2.4-port4: Cannot enable. Maybe the USB cable is bad?
[ 7099.690287] usb 1-4.2.4-port4: attempt power cycle
[ 7127.926446] usbcore: deregistering interface driver r8152
[ 7128.110058] usb 4-1.1: reset SuperSpeed Gen 1 USB device number 7 using xhci_hcd
[ 7128.133313] r8152 4-1.1:1.0: firmware: direct-loading firmware rtl_nic/rtl8153a-3.fw
[ 7128.133575] r8152 4-1.1:1.0 (unnamed net_device) (uninitialized): Using pass-thru MAC addr c0:3e:ba:b1:8c:7c
[ 7128.154068] r8152 4-1.1:1.0: load rtl8153a-3 v2 02/07/20 successfully
[ 7128.182102] r8152 4-1.1:1.0 eth0: v1.11.11
[ 7128.182164] usbcore: registered new interface driver r8152
[ 7128.184558] r8152 4-1.1:1.0 enxc03ebab18c7c: renamed from eth0
[ 7129.271348] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[ 7129.417129] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[ 7131.636407] IPv6: ADDRCONF(NETDEV_CHANGE): enxc03ebab18c7c: link becomes ready
[ 7131.636647] r8152 4-1.1:1.0 enxc03ebab18c7c: carrier on
[ 7146.268459] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[ 7147.297575] iwlwifi 0000:00:14.3: SecBoot CPU1 Status: 0x5cdd, CPU2 Status: 0x3
[ 7147.297602] iwlwifi 0000:00:14.3: UMAC PC: 0x80483754
[ 7147.297626] iwlwifi 0000:00:14.3: LMAC PC: 0x166b4
[ 7147.297631] iwlwifi 0000:00:14.3: Collecting data: trigger 15 fired.
[ 7147.298726] iwlwifi 0000:00:14.3: Loaded firmware version: 50.3e391d3e.0 QuZ-a0-hr-b0-50.ucode
[ 7147.298730] iwlwifi 0000:00:14.3: 0x00000000 | ADVANCED_SYSASSERT          
[ 7147.298732] iwlwifi 0000:00:14.3: 0x00000000 | trm_hw_status0
[ 7147.298734] iwlwifi 0000:00:14.3: 0x00000000 | trm_hw_status1
[ 7147.298737] iwlwifi 0000:00:14.3: 0x00000000 | branchlink2
[ 7147.298739] iwlwifi 0000:00:14.3: 0x00000000 | interruptlink1
[ 7147.298741] iwlwifi 0000:00:14.3: 0x00000000 | interruptlink2
[ 7147.298743] iwlwifi 0000:00:14.3: 0x00000000 | data1
[ 7147.298745] iwlwifi 0000:00:14.3: 0x00000000 | data2
[ 7147.298747] iwlwifi 0000:00:14.3: 0x00000000 | data3
[ 7147.298750] iwlwifi 0000:00:14.3: 0x00000000 | beacon time
[ 7147.298752] iwlwifi 0000:00:14.3: 0x00000000 | tsf low
[ 7147.298754] iwlwifi 0000:00:14.3: 0x00000000 | tsf hi
[ 7147.298756] iwlwifi 0000:00:14.3: 0x00000000 | time gp1
[ 7147.298758] iwlwifi 0000:00:14.3: 0x00000000 | time gp2
[ 7147.298760] iwlwifi 0000:00:14.3: 0x00000000 | uCode revision type
[ 7147.298763] iwlwifi 0000:00:14.3: 0x00000000 | uCode version major
[ 7147.298765] iwlwifi 0000:00:14.3: 0x00000000 | uCode version minor
[ 7147.298767] iwlwifi 0000:00:14.3: 0x00000000 | hw version
[ 7147.298769] iwlwifi 0000:00:14.3: 0x00000000 | board version
[ 7147.298771] iwlwifi 0000:00:14.3: 0x00000000 | hcmd
[ 7147.298773] iwlwifi 0000:00:14.3: 0x00000000 | isr0
[ 7147.298776] iwlwifi 0000:00:14.3: 0x00000000 | isr1
[ 7147.298778] iwlwifi 0000:00:14.3: 0x00000000 | isr2
[ 7147.298780] iwlwifi 0000:00:14.3: 0x00000000 | isr3
[ 7147.298782] iwlwifi 0000:00:14.3: 0x00000000 | isr4
[ 7147.298784] iwlwifi 0000:00:14.3: 0x00000000 | last cmd Id
[ 7147.298786] iwlwifi 0000:00:14.3: 0x00000000 | wait_event
[ 7147.298788] iwlwifi 0000:00:14.3: 0x00000000 | l2p_control
[ 7147.298790] iwlwifi 0000:00:14.3: 0x00000000 | l2p_duration
[ 7147.298792] iwlwifi 0000:00:14.3: 0x00000000 | l2p_mhvalid
[ 7147.298795] iwlwifi 0000:00:14.3: 0x00000000 | l2p_addr_match
[ 7147.298797] iwlwifi 0000:00:14.3: 0x00000000 | lmpm_pmg_sel
[ 7147.298799] iwlwifi 0000:00:14.3: 0x00000000 | timestamp
[ 7147.298801] iwlwifi 0000:00:14.3: 0x00000000 | flow_handler
[ 7147.298837] iwlwifi 0000:00:14.3: Start IWL Error Log Dump:
[ 7147.298841] iwlwifi 0000:00:14.3: Status: 0x00000000, count: 7
[ 7147.298844] iwlwifi 0000:00:14.3: 0x20000066 | NMI_INTERRUPT_HOST
[ 7147.298846] iwlwifi 0000:00:14.3: 0x00000000 | umac branchlink1
[ 7147.298848] iwlwifi 0000:00:14.3: 0x80465E6A | umac branchlink2
[ 7147.298851] iwlwifi 0000:00:14.3: 0x80483754 | umac interruptlink1
[ 7147.298853] iwlwifi 0000:00:14.3: 0x80483754 | umac interruptlink2
[ 7147.298856] iwlwifi 0000:00:14.3: 0x01000000 | umac data1
[ 7147.298858] iwlwifi 0000:00:14.3: 0x80483754 | umac data2
[ 7147.298860] iwlwifi 0000:00:14.3: 0x00000000 | umac data3
[ 7147.298862] iwlwifi 0000:00:14.3: 0x00000032 | umac major
[ 7147.298865] iwlwifi 0000:00:14.3: 0x3E391D3E | umac minor
[ 7147.298867] iwlwifi 0000:00:14.3: 0x000FB43D | frame pointer
[ 7147.298869] iwlwifi 0000:00:14.3: 0xC0886284 | stack pointer
[ 7147.298872] iwlwifi 0000:00:14.3: 0x0000FFFF | last host cmd
[ 7147.298874] iwlwifi 0000:00:14.3: 0x00000000 | isr status reg
[ 7147.298891] iwlwifi 0000:00:14.3: Fseq Registers:
[ 7147.298910] iwlwifi 0000:00:14.3: 0x60000021 | FSEQ_ERROR_CODE
[ 7147.298915] iwlwifi 0000:00:14.3: 0x80290033 | FSEQ_TOP_INIT_VERSION
[ 7147.298934] iwlwifi 0000:00:14.3: 0x00070043 | FSEQ_CNVIO_INIT_VERSION
[ 7147.298938] iwlwifi 0000:00:14.3: 0x0000A481 | FSEQ_OTP_VERSION
[ 7147.298957] iwlwifi 0000:00:14.3: 0x00000002 | FSEQ_TOP_CONTENT_VERSION
[ 7147.298961] iwlwifi 0000:00:14.3: 0x4552414E | FSEQ_ALIVE_TOKEN
[ 7147.298980] iwlwifi 0000:00:14.3: 0x20000302 | FSEQ_CNVI_ID
[ 7147.298983] iwlwifi 0000:00:14.3: 0x01300504 | FSEQ_CNVR_ID
[ 7147.299003] iwlwifi 0000:00:14.3: 0x20000302 | CNVI_AUX_MISC_CHIP
[ 7147.299009] iwlwifi 0000:00:14.3: 0x01300504 | CNVR_AUX_MISC_CHIP
[ 7147.299031] iwlwifi 0000:00:14.3: 0x05B0905B | CNVR_SCU_SD_REGS_SD_REG_DIG_DCDC_VTRIM
[ 7147.299053] iwlwifi 0000:00:14.3: 0x0000025B | CNVR_SCU_SD_REGS_SD_REG_ACTIVE_VDIG_MIRROR
[ 7147.299164] ieee80211 phy0: Hardware restart was requested
[ 7147.299171] iwlwifi 0000:00:14.3: Failed to start RT ucode: -110
[ 7147.299174] iwlwifi 0000:00:14.3: Failed to start RT ucode: -110
[ 7147.299197] iwlwifi 0000:00:14.3: Firmware not running - cannot dump error
[ 7157.491815] IPv6: ADDRCONF(NETDEV_CHANGE): enxc03ebab18c7c: link becomes ready
[ 7157.491970] r8152 4-1.1:1.0 enxc03ebab18c7c: carrier on
[ 7158.915802] IPv6: ADDRCONF(NETDEV_CHANGE): enxc03ebab18c7c: link becomes ready
[ 7158.915951] r8152 4-1.1:1.0 enxc03ebab18c7c: carrier on
[ 7229.697414] raid6: avx2x4   gen() 42190 MB/s
[ 7229.765411] raid6: avx2x4   xor() 19501 MB/s
[ 7229.833414] raid6: avx2x2   gen() 42642 MB/s
[ 7229.901408] raid6: avx2x2   xor() 25174 MB/s
[ 7229.969411] raid6: avx2x1   gen() 35623 MB/s
[ 7230.037409] raid6: avx2x1   xor() 19991 MB/s
[ 7230.105408] raid6: sse2x4   gen() 16824 MB/s
[ 7230.173412] raid6: sse2x4   xor()  9205 MB/s
[ 7230.241410] raid6: sse2x2   gen() 17096 MB/s
[ 7230.309408] raid6: sse2x2   xor() 10490 MB/s
[ 7230.377409] raid6: sse2x1   gen() 14369 MB/s
[ 7230.445414] raid6: sse2x1   xor()  7125 MB/s
[ 7230.445414] raid6: using algorithm avx2x2 gen() 42642 MB/s
[ 7230.445414] raid6: .... xor() 25174 MB/s, rmw enabled
[ 7230.445415] raid6: using avx2x2 recovery algorithm
[ 7230.450080] xor: automatically using best checksumming function   avx       
[ 7230.481709] Btrfs loaded, crc32c=crc32c-generic
[ 7230.495745] JFS: nTxBlock = 8192, nTxLock = 65536
[ 7230.535418] SGI XFS with ACLs, security attributes, realtime, quota, no debug enabled
[ 7241.014933] device-mapper: uevent: version 1.0.3
[ 7241.015041] device-mapper: ioctl: 4.42.0-ioctl (2020-02-27) initialised: dm-devel@redhat.com
[ 7241.303898]  mmcblk0: p1
[ 7241.362801]  mmcblk0: p1
[ 7308.289480]  mmcblk0: p1 p2 p3
[ 7308.613503] Adding 999420k swap on /dev/mmcblk0p3.  Priority:-2 extents:1 across:999420k SSFS
[ 7326.276457] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: errors=remount-ro
[ 7449.529447] process 'lib/klibc/bin/fstype' started with executable stack
[ 7525.080585] mmc0: tuning execution failed: -22
[ 7531.124529] mmc0: tuning execution failed: -22
[ 7534.572525] mmc0: tuning execution failed: -22
[ 7734.273565] INFO: task kworker/u24:0:6566 blocked for more than 120 seconds.
[ 7734.273569]       Not tainted 5.6.0-2-amd64 #1 Debian 5.6.14-2
[ 7734.273570] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 7734.273573] kworker/u24:0   D    0  6566      2 0x80004000
[ 7734.273588] Workqueue: writeback wb_workfn (flush-179:0)
[ 7734.273592] Call Trace:
[ 7734.273603]  ? __schedule+0x2d8/0x760
[ 7734.273610]  ? blk_flush_plug_list+0xec/0x110
[ 7734.273615]  ? __wbt_done+0x30/0x30
[ 7734.273619]  ? schedule+0x4a/0xb0
[ 7734.273623]  ? io_schedule+0x12/0x40
[ 7734.273628]  ? rq_qos_wait+0x106/0x170
[ 7734.273632]  ? karma_partition+0x210/0x210
[ 7734.273636]  ? wbt_cleanup_cb+0x20/0x20
[ 7734.273641]  ? wbt_wait+0x99/0xe0
[ 7734.273645]  ? __rq_qos_throttle+0x23/0x30
[ 7734.273650]  ? blk_mq_make_request+0x10e/0x5d0
[ 7734.273655]  ? generic_make_request+0xcf/0x320
[ 7734.273660]  ? submit_bio+0x42/0x1c0
[ 7734.273665]  ? bio_add_page+0x62/0x90
[ 7734.273672]  ? submit_bh_wbc+0x16a/0x190
[ 7734.273677]  ? __block_write_full_page+0x200/0x430
[ 7734.273682]  ? touch_buffer+0x60/0x60
[ 7734.273686]  ? blkdev_direct_IO+0x4a0/0x4a0
[ 7734.273692]  ? __writepage+0x19/0x50
[ 7734.273696]  ? write_cache_pages+0x171/0x420
[ 7734.273700]  ? __wb_calc_thresh+0x120/0x120
[ 7734.273707]  ? generic_writepages+0x57/0x90
[ 7734.273713]  ? do_writepages+0x43/0xd0
[ 7734.273719]  ? __writeback_single_inode+0x3d/0x350
[ 7734.273724]  ? writeback_sb_inodes+0x20b/0x470
[ 7734.273731]  ? __writeback_inodes_wb+0x4c/0xc0
[ 7734.273736]  ? wb_writeback+0x25d/0x2f0
[ 7734.273743]  ? get_nr_inodes+0x32/0x50
[ 7734.273748]  ? wb_workfn+0x381/0x440
[ 7734.273754]  ? process_one_work+0x1b4/0x380
[ 7734.273757]  ? worker_thread+0x50/0x3c0
[ 7734.273763]  ? kthread+0xf9/0x130
[ 7734.273766]  ? process_one_work+0x380/0x380
[ 7734.273770]  ? kthread_park+0x90/0x90
[ 7734.273774]  ? ret_from_fork+0x1f/0x40
[ 7734.273788] INFO: task jbd2/mmcblk0p2-:13558 blocked for more than 120 seconds.
[ 7734.273790]       Not tainted 5.6.0-2-amd64 #1 Debian 5.6.14-2
[ 7734.273791] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 7734.273793] jbd2/mmcblk0p2- D    0 13558      2 0x80004000
[ 7734.273796] Call Trace:
[ 7734.273802]  ? __schedule+0x2d8/0x760
[ 7734.273808]  ? __switch_to_asm+0x40/0x70
[ 7734.273813]  ? __switch_to_asm+0x40/0x70
[ 7734.273818]  ? bit_wait_timeout+0x90/0x90
[ 7734.273821]  ? schedule+0x4a/0xb0
[ 7734.273826]  ? io_schedule+0x12/0x40
[ 7734.273830]  ? bit_wait_io+0xd/0x50
[ 7734.273834]  ? __wait_on_bit+0x2a/0x90
[ 7734.273839]  ? out_of_line_wait_on_bit+0x92/0xb0
[ 7734.273845]  ? var_wake_function+0x20/0x20
[ 7734.273861]  ? jbd2_journal_commit_transaction+0x106d/0x1920 [jbd2]
[ 7734.273873]  ? try_to_del_timer_sync+0x4f/0x80
[ 7734.273885]  ? kjournald2+0xb7/0x280 [jbd2]
[ 7734.273890]  ? finish_wait+0x80/0x80
[ 7734.273896]  ? kthread+0xf9/0x130
[ 7734.273906]  ? commit_timeout+0x10/0x10 [jbd2]
[ 7734.273911]  ? kthread_park+0x90/0x90
[ 7734.273914]  ? ret_from_fork+0x1f/0x40
[ 7734.273919] INFO: task ext4lazyinit:13560 blocked for more than 120 seconds.
[ 7734.273921]       Not tainted 5.6.0-2-amd64 #1 Debian 5.6.14-2
[ 7734.273922] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 7734.273924] ext4lazyinit    D    0 13560      2 0x80004000
[ 7734.273926] Call Trace:
[ 7734.273932]  ? __schedule+0x2d8/0x760
[ 7734.273935]  ? schedule+0x4a/0xb0
[ 7734.273941]  ? __switch_to_asm+0x40/0x70
[ 7734.273945]  ? bit_wait_timeout+0x90/0x90
[ 7734.273949]  ? schedule+0x4a/0xb0
[ 7734.273953]  ? io_schedule+0x12/0x40
[ 7734.273957]  ? bit_wait_io+0xd/0x50
[ 7734.273961]  ? __wait_on_bit_lock+0x5d/0xa0
[ 7734.273966]  ? out_of_line_wait_on_bit_lock+0x92/0xb0
[ 7734.273971]  ? var_wake_function+0x20/0x20
[ 7734.273981]  ? do_get_write_access+0x252/0x3d0 [jbd2]
[ 7734.273989]  ? jbd2__journal_start+0xf7/0x1f0 [jbd2]
[ 7734.273997]  ? jbd2_journal_get_write_access+0x5c/0x80 [jbd2]
[ 7734.274028]  ? __ext4_journal_get_write_access+0x37/0x80 [ext4]
[ 7734.274055]  ? ext4_init_inode_table+0x157/0x390 [ext4]
[ 7734.274090]  ? ext4_lazyinit_thread+0x2bd/0x3a0 [ext4]
[ 7734.274096]  ? kthread+0xf9/0x130
[ 7734.274127]  ? ext4_unregister_li_request+0x60/0x60 [ext4]
[ 7734.274132]  ? kthread_park+0x90/0x90
[ 7734.274135]  ? ret_from_fork+0x1f/0x40
[ 7855.105566] INFO: task kworker/u24:0:6566 blocked for more than 241 seconds.
[ 7855.105570]       Not tainted 5.6.0-2-amd64 #1 Debian 5.6.14-2
[ 7855.105572] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 7855.105574] kworker/u24:0   D    0  6566      2 0x80004000
[ 7855.105590] Workqueue: writeback wb_workfn (flush-179:0)
[ 7855.105593] Call Trace:
[ 7855.105604]  ? __schedule+0x2d8/0x760
[ 7855.105610]  ? blk_flush_plug_list+0xec/0x110
[ 7855.105616]  ? __wbt_done+0x30/0x30
[ 7855.105620]  ? schedule+0x4a/0xb0
[ 7855.105624]  ? io_schedule+0x12/0x40
[ 7855.105628]  ? rq_qos_wait+0x106/0x170
[ 7855.105632]  ? karma_partition+0x210/0x210
[ 7855.105637]  ? wbt_cleanup_cb+0x20/0x20
[ 7855.105641]  ? wbt_wait+0x99/0xe0
[ 7855.105646]  ? __rq_qos_throttle+0x23/0x30
[ 7855.105650]  ? blk_mq_make_request+0x10e/0x5d0
[ 7855.105655]  ? generic_make_request+0xcf/0x320
[ 7855.105660]  ? submit_bio+0x42/0x1c0
[ 7855.105665]  ? bio_add_page+0x62/0x90
[ 7855.105671]  ? submit_bh_wbc+0x16a/0x190
[ 7855.105677]  ? __block_write_full_page+0x200/0x430
[ 7855.105682]  ? touch_buffer+0x60/0x60
[ 7855.105686]  ? blkdev_direct_IO+0x4a0/0x4a0
[ 7855.105692]  ? __writepage+0x19/0x50
[ 7855.105696]  ? write_cache_pages+0x171/0x420
[ 7855.105700]  ? __wb_calc_thresh+0x120/0x120
[ 7855.105707]  ? generic_writepages+0x57/0x90
[ 7855.105713]  ? do_writepages+0x43/0xd0
[ 7855.105718]  ? __writeback_single_inode+0x3d/0x350
[ 7855.105724]  ? writeback_sb_inodes+0x20b/0x470
[ 7855.105731]  ? __writeback_inodes_wb+0x4c/0xc0
[ 7855.105736]  ? wb_writeback+0x25d/0x2f0
[ 7855.105742]  ? get_nr_inodes+0x32/0x50
[ 7855.105747]  ? wb_workfn+0x381/0x440
[ 7855.105753]  ? process_one_work+0x1b4/0x380
[ 7855.105756]  ? worker_thread+0x50/0x3c0
[ 7855.105762]  ? kthread+0xf9/0x130
[ 7855.105765]  ? process_one_work+0x380/0x380
[ 7855.105769]  ? kthread_park+0x90/0x90
[ 7855.105773]  ? ret_from_fork+0x1f/0x40
[ 7855.105787] INFO: task jbd2/mmcblk0p2-:13558 blocked for more than 241 seconds.
[ 7855.105789]       Not tainted 5.6.0-2-amd64 #1 Debian 5.6.14-2
[ 7855.105790] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 7855.105792] jbd2/mmcblk0p2- D    0 13558      2 0x80004000
[ 7855.105795] Call Trace:
[ 7855.105801]  ? __schedule+0x2d8/0x760
[ 7855.105807]  ? __switch_to_asm+0x40/0x70
[ 7855.105812]  ? __switch_to_asm+0x40/0x70
[ 7855.105817]  ? bit_wait_timeout+0x90/0x90
[ 7855.105820]  ? schedule+0x4a/0xb0
[ 7855.105824]  ? io_schedule+0x12/0x40
[ 7855.105829]  ? bit_wait_io+0xd/0x50
[ 7855.105833]  ? __wait_on_bit+0x2a/0x90
[ 7855.105838]  ? out_of_line_wait_on_bit+0x92/0xb0
[ 7855.105844]  ? var_wake_function+0x20/0x20
[ 7855.105859]  ? jbd2_journal_commit_transaction+0x106d/0x1920 [jbd2]
[ 7855.105871]  ? try_to_del_timer_sync+0x4f/0x80
[ 7855.105882]  ? kjournald2+0xb7/0x280 [jbd2]
[ 7855.105887]  ? finish_wait+0x80/0x80
[ 7855.105893]  ? kthread+0xf9/0x130
[ 7855.105902]  ? commit_timeout+0x10/0x10 [jbd2]
[ 7855.105906]  ? kthread_park+0x90/0x90
[ 7855.105909]  ? ret_from_fork+0x1f/0x40
[ 7855.105914] INFO: task ext4lazyinit:13560 blocked for more than 241 seconds.
[ 7855.105916]       Not tainted 5.6.0-2-amd64 #1 Debian 5.6.14-2
[ 7855.105917] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 7855.105919] ext4lazyinit    D    0 13560      2 0x80004000
[ 7855.105922] Call Trace:
[ 7855.105927]  ? __schedule+0x2d8/0x760
[ 7855.105931]  ? schedule+0x4a/0xb0
[ 7855.105936]  ? __switch_to_asm+0x40/0x70
[ 7855.105940]  ? bit_wait_timeout+0x90/0x90
[ 7855.105944]  ? schedule+0x4a/0xb0
[ 7855.105948]  ? io_schedule+0x12/0x40
[ 7855.105952]  ? bit_wait_io+0xd/0x50
[ 7855.105956]  ? __wait_on_bit_lock+0x5d/0xa0
[ 7855.105961]  ? out_of_line_wait_on_bit_lock+0x92/0xb0
[ 7855.105967]  ? var_wake_function+0x20/0x20
[ 7855.105976]  ? do_get_write_access+0x252/0x3d0 [jbd2]
[ 7855.105984]  ? jbd2__journal_start+0xf7/0x1f0 [jbd2]
[ 7855.105992]  ? jbd2_journal_get_write_access+0x5c/0x80 [jbd2]
[ 7855.106020]  ? __ext4_journal_get_write_access+0x37/0x80 [ext4]
[ 7855.106046]  ? ext4_init_inode_table+0x157/0x390 [ext4]
[ 7855.106079]  ? ext4_lazyinit_thread+0x2bd/0x3a0 [ext4]
[ 7855.106085]  ? kthread+0xf9/0x130
[ 7855.106113]  ? ext4_unregister_li_request+0x60/0x60 [ext4]
[ 7855.106118]  ? kthread_park+0x90/0x90
[ 7855.106121]  ? ret_from_fork+0x1f/0x40
[ 7975.937465] INFO: task kworker/u24:0:6566 blocked for more than 362 seconds.
[ 7975.937470]       Not tainted 5.6.0-2-amd64 #1 Debian 5.6.14-2
[ 7975.937471] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 7975.937473] kworker/u24:0   D    0  6566      2 0x80004000
[ 7975.937488] Workqueue: writeback wb_workfn (flush-179:0)
[ 7975.937492] Call Trace:
[ 7975.937503]  ? __schedule+0x2d8/0x760
[ 7975.937509]  ? blk_flush_plug_list+0xec/0x110
[ 7975.937515]  ? __wbt_done+0x30/0x30
[ 7975.937519]  ? schedule+0x4a/0xb0
[ 7975.937523]  ? io_schedule+0x12/0x40
[ 7975.937528]  ? rq_qos_wait+0x106/0x170
[ 7975.937532]  ? karma_partition+0x210/0x210
[ 7975.937536]  ? wbt_cleanup_cb+0x20/0x20
[ 7975.937541]  ? wbt_wait+0x99/0xe0
[ 7975.937545]  ? __rq_qos_throttle+0x23/0x30
[ 7975.937549]  ? blk_mq_make_request+0x10e/0x5d0
[ 7975.937555]  ? generic_make_request+0xcf/0x320
[ 7975.937560]  ? submit_bio+0x42/0x1c0
[ 7975.937565]  ? bio_add_page+0x62/0x90
[ 7975.937571]  ? submit_bh_wbc+0x16a/0x190
[ 7975.937578]  ? __block_write_full_page+0x200/0x430
[ 7975.937583]  ? touch_buffer+0x60/0x60
[ 7975.937586]  ? blkdev_direct_IO+0x4a0/0x4a0
[ 7975.937592]  ? __writepage+0x19/0x50
[ 7975.937597]  ? write_cache_pages+0x171/0x420
[ 7975.937601]  ? __wb_calc_thresh+0x120/0x120
[ 7975.937608]  ? generic_writepages+0x57/0x90
[ 7975.937614]  ? do_writepages+0x43/0xd0
[ 7975.937619]  ? __writeback_single_inode+0x3d/0x350
[ 7975.937625]  ? writeback_sb_inodes+0x20b/0x470
[ 7975.937632]  ? __writeback_inodes_wb+0x4c/0xc0
[ 7975.937637]  ? wb_writeback+0x25d/0x2f0
[ 7975.937643]  ? get_nr_inodes+0x32/0x50
[ 7975.937648]  ? wb_workfn+0x381/0x440
[ 7975.937654]  ? process_one_work+0x1b4/0x380
[ 7975.937658]  ? worker_thread+0x50/0x3c0
[ 7975.937664]  ? kthread+0xf9/0x130
[ 7975.937667]  ? process_one_work+0x380/0x380
[ 7975.937671]  ? kthread_park+0x90/0x90
[ 7975.937674]  ? ret_from_fork+0x1f/0x40
[ 7975.937688] INFO: task jbd2/mmcblk0p2-:13558 blocked for more than 362 seconds.
[ 7975.937691]       Not tainted 5.6.0-2-amd64 #1 Debian 5.6.14-2
[ 7975.937692] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 7975.937694] jbd2/mmcblk0p2- D    0 13558      2 0x80004000
[ 7975.937698] Call Trace:
[ 7975.937704]  ? __schedule+0x2d8/0x760
[ 7975.937709]  ? __switch_to_asm+0x40/0x70
[ 7975.937714]  ? __switch_to_asm+0x40/0x70
[ 7975.937719]  ? bit_wait_timeout+0x90/0x90
[ 7975.937723]  ? schedule+0x4a/0xb0
[ 7975.937728]  ? io_schedule+0x12/0x40
[ 7975.937732]  ? bit_wait_io+0xd/0x50
[ 7975.937736]  ? __wait_on_bit+0x2a/0x90
[ 7975.937741]  ? out_of_line_wait_on_bit+0x92/0xb0
[ 7975.937747]  ? var_wake_function+0x20/0x20
[ 7975.937764]  ? jbd2_journal_commit_transaction+0x106d/0x1920 [jbd2]
[ 7975.937776]  ? try_to_del_timer_sync+0x4f/0x80
[ 7975.937788]  ? kjournald2+0xb7/0x280 [jbd2]
[ 7975.937793]  ? finish_wait+0x80/0x80
[ 7975.937798]  ? kthread+0xf9/0x130
[ 7975.937808]  ? commit_timeout+0x10/0x10 [jbd2]
[ 7975.937813]  ? kthread_park+0x90/0x90
[ 7975.937816]  ? ret_from_fork+0x1f/0x40
[ 7975.937821] INFO: task ext4lazyinit:13560 blocked for more than 362 seconds.
[ 7975.937823]       Not tainted 5.6.0-2-amd64 #1 Debian 5.6.14-2
[ 7975.937824] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 7975.937826] ext4lazyinit    D    0 13560      2 0x80004000
[ 7975.937829] Call Trace:
[ 7975.937834]  ? __schedule+0x2d8/0x760
[ 7975.937837]  ? schedule+0x4a/0xb0
[ 7975.937843]  ? __switch_to_asm+0x40/0x70
[ 7975.937848]  ? bit_wait_timeout+0x90/0x90
[ 7975.937851]  ? schedule+0x4a/0xb0
[ 7975.937855]  ? io_schedule+0x12/0x40
[ 7975.937859]  ? bit_wait_io+0xd/0x50
[ 7975.937863]  ? __wait_on_bit_lock+0x5d/0xa0
[ 7975.937868]  ? out_of_line_wait_on_bit_lock+0x92/0xb0
[ 7975.937874]  ? var_wake_function+0x20/0x20
[ 7975.937883]  ? do_get_write_access+0x252/0x3d0 [jbd2]
[ 7975.937891]  ? jbd2__journal_start+0xf7/0x1f0 [jbd2]
[ 7975.937900]  ? jbd2_journal_get_write_access+0x5c/0x80 [jbd2]
[ 7975.937930]  ? __ext4_journal_get_write_access+0x37/0x80 [ext4]
[ 7975.937958]  ? ext4_init_inode_table+0x157/0x390 [ext4]
[ 7975.937992]  ? ext4_lazyinit_thread+0x2bd/0x3a0 [ext4]
[ 7975.937998]  ? kthread+0xf9/0x130
[ 7975.938028]  ? ext4_unregister_li_request+0x60/0x60 [ext4]
[ 7975.938033]  ? kthread_park+0x90/0x90
[ 7975.938036]  ? ret_from_fork+0x1f/0x40
[ 8096.769522] INFO: task kworker/u24:0:6566 blocked for more than 483 seconds.
[ 8096.769526]       Not tainted 5.6.0-2-amd64 #1 Debian 5.6.14-2
[ 8096.769528] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 8096.769530] kworker/u24:0   D    0  6566      2 0x80004000
[ 8096.769546] Workqueue: writeback wb_workfn (flush-179:0)
[ 8096.769549] Call Trace:
[ 8096.769560]  ? __schedule+0x2d8/0x760
[ 8096.769567]  ? blk_flush_plug_list+0xec/0x110
[ 8096.769573]  ? __wbt_done+0x30/0x30
[ 8096.769577]  ? schedule+0x4a/0xb0
[ 8096.769581]  ? io_schedule+0x12/0x40
[ 8096.769585]  ? rq_qos_wait+0x106/0x170
[ 8096.769590]  ? karma_partition+0x210/0x210
[ 8096.769594]  ? wbt_cleanup_cb+0x20/0x20
[ 8096.769599]  ? wbt_wait+0x99/0xe0
[ 8096.769603]  ? __rq_qos_throttle+0x23/0x30
[ 8096.769607]  ? blk_mq_make_request+0x10e/0x5d0
[ 8096.769613]  ? generic_make_request+0xcf/0x320
[ 8096.769618]  ? submit_bio+0x42/0x1c0
[ 8096.769623]  ? bio_add_page+0x62/0x90
[ 8096.769629]  ? submit_bh_wbc+0x16a/0x190
[ 8096.769635]  ? __block_write_full_page+0x200/0x430
[ 8096.769641]  ? touch_buffer+0x60/0x60
[ 8096.769644]  ? blkdev_direct_IO+0x4a0/0x4a0
[ 8096.769650]  ? __writepage+0x19/0x50
[ 8096.769655]  ? write_cache_pages+0x171/0x420
[ 8096.769659]  ? __wb_calc_thresh+0x120/0x120
[ 8096.769666]  ? generic_writepages+0x57/0x90
[ 8096.769672]  ? do_writepages+0x43/0xd0
[ 8096.769678]  ? __writeback_single_inode+0x3d/0x350
[ 8096.769683]  ? writeback_sb_inodes+0x20b/0x470
[ 8096.769690]  ? __writeback_inodes_wb+0x4c/0xc0
[ 8096.769695]  ? wb_writeback+0x25d/0x2f0
[ 8096.769702]  ? get_nr_inodes+0x32/0x50
[ 8096.769707]  ? wb_workfn+0x381/0x440
[ 8096.769713]  ? process_one_work+0x1b4/0x380
[ 8096.769717]  ? worker_thread+0x50/0x3c0
[ 8096.769722]  ? kthread+0xf9/0x130
[ 8096.769725]  ? process_one_work+0x380/0x380
[ 8096.769729]  ? kthread_park+0x90/0x90
[ 8096.769733]  ? ret_from_fork+0x1f/0x40
[ 9585.766167] mmc0: cannot verify signal voltage switch
[ 9586.073506] mmc0: tried to HW reset card, got error -110
[10036.599984] blk_update_request: I/O error, dev mmcblk0, sector 123482544 op 0x1:(WRITE) flags 0x800 phys_seg 17 prio class 0
[10036.600073] Aborting journal on device mmcblk0p2-8.
[10036.600083] EXT4-fs error (device mmcblk0p2) in ext4_orphan_del:3079: Journal has aborted

This was with Linux kernel version 5.6.0-2-amd64 #1 SMP Debian 5.6.14-2 (2020-06-09) (from uname -a).

I made some more tests. I made a checksum of a large file (~2GB), copied it to the SD card, unmounted (to clear the buffers), mounted again, calculated the checksum, and it didn't match. So there's definitely an issue with errors while writing, errors while reading, or both.

I did the same thing on Windows 10: coped a file to an SD card, restarted to make sure buffers are cleared, read the file back again, calculated the checksum. The checksum matched.

So it seems to be a problem specific to Linux. Not sure where to go next. 

Precision 5750. I have the same problem under Ubuntu 20.04 kernel 5.10.0-1038-oem. I tried Zorin OS 16 with kernel 5.11.0-27-generic and have no problem anymore. Does anybody know how to apply any patch to Ubuntu 20.04 kernel?

Good to know I'm not the only person seeing this problem! Also, knowing that it worked fine with Linux 5.11 is great news!

About your patch, have you seen this news piece? It mentions Ubuntu 20.04.3 with Linux 5.11.

I should add that the Card Reader works perfectly with smaller size cards (2GB, 8GB). The problem appears when I insert high speed SDXC 128 GB card.

I m already on Ubuntu LTS 20.04.1. I wonder, how could I upgrade to newest Ubuntu LTS release point 20.04.3. When I execute:

sudo do-release-upgrade -d

I receive

Checking for a new Ubuntu release
There is no development version of an LTS available.

I further investigated the issue - I can see that on some Ubuntu kernels SDXC card works, and on others does not work.

1. Ubuntu 20.04.1 kernel 5.4.0-42-generic - card is auto mounted

2. Ubuntu 20.04.3 kernel 5.11.0-27-generic - card cannot be mounted

3. Ubuntu 20.04.1 kernel 5.10.-1038-oem (original ver for Precision 5750) - card cannot be mounted