Hi,
I installed fedora 32 into an SD card, with which I booted my Macbook.
It had worked well before, until I upgraded the kernel from 5.8.5 to
5.8.6 [1].
With kernel-5.8.6-200.fc32.x86_64.rpm [2] installed, the boot process
would be stuck at "A start job is running for
/dev/mapper/fedora_localhost_--live-home (<time> / no limit)" (See the
photo of screen [3]).
By appending "systemd.debug-shell=1" to the kernel cmdline, I saved
the journal [4].
This issue has been bisected to commit
53965c79c2dbdc898ffc7fdbab37e920594f5e14 ("USB: Fix device driver
race")
If I revert this commit, the kernel 5.8.6 would boot successfully.
Some background:
- The SDXC card slot on my Macbook Pro [5] is managed by USB controller [6]
- About the SD Card Reader, "lsusb -vv" shows:
```
Bus 002 Device 002: ID 05ac:8406 Apple, Inc. Internal Memory Card Reader
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 3.00
bDeviceClass 0
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 9
idVendor 0x05ac Apple, Inc.
idProduct 0x8406 Internal Memory Card Reader
bcdDevice 8.20
iManufacturer 3 Apple
iProduct 4 Card Reader
iSerial 5 000000000820
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x002c
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 896mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6 SCSI
bInterfaceProtocol 80 Bulk-Only
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0400 1x 1024 bytes
bInterval 0
bMaxBurst 4
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0400 1x 1024 bytes
bInterval 0
bMaxBurst 4
Binary Object Store Descriptor:
bLength 5
bDescriptorType 15
wTotalLength 0x0016
bNumDeviceCaps 2
USB 2.0 Extension Device Capability:
bLength 7
bDescriptorType 16
bDevCapabilityType 2
bmAttributes 0x00000002
HIRD Link Power Management (LPM) Supported
SuperSpeed USB Device Capability:
bLength 10
bDescriptorType 16
bDevCapabilityType 3
bmAttributes 0x02
Latency Tolerance Messages (LTM) Supported
wSpeedsSupported 0x000e
Device can operate at Full Speed (12Mbps)
Device can operate at High Speed (480Mbps)
Device can operate at SuperSpeed (5Gbps)
bFunctionalitySupport 1
Lowest fully-functional device speed is Full Speed (12Mbps)
bU1DevExitLat 10 micro seconds
bU2DevExitLat 2047 micro seconds
can't get debug descriptor: Resource temporarily unavailable
Device Status: 0x001c
(Bus Powered)
U1 Enabled
U2 Enabled
Latency Tolerance Messaging (LTM) Enabled
```
I'm looking forward to getting help from you guys. Thanks!
[1] https://bugzilla.redhat.com/show_bug.cgi?id=1878347
[2] https://koji.fedoraproject.org/koji/buildinfo?buildID=1605304
[3] https://bugzilla.redhat.com/attachment.cgi?id=1714633
[4] https://bugzilla.redhat.com/attachment.cgi?id=1717469
[5] https://support.apple.com/kb/SP715?locale=en_US
[6] https://support.apple.com/en-us/HT204384#4
--
Regards,
Pany
pany@xxxxxxxxxxxxxxxxx
