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SubjectRe: Kernel 5.15 doesn't detect SATA drive on boot
On 2021/11/16 21:44, Yuji Nakao wrote:
> Hello,
> I'm using Arch Linux on MacBook Air 2010. I updated `linux` package[1]
> from v5.14.16 to v5.15.2 the other day, and the boot process stalled
> with the following message.
> ```shell
> :: running early hook [udev]
> Starting version 249.6-3-arch
> :: running hook [udev]
> :: Triggering uevents...
> Waiting 10 seconds for device /dev/sda3 ...
> ERROR: device '/dev/sda3' not found. Skipping fsck.
> :: mounting '/dev/sda' on real root
> mount: /new_root: no filesystem type specified.
> You are now being dropped into an emergency shell.
> sh: can't access tty; job control turned off
> [rootfs ]#
> ```
> In the emergency shell there's no `sda` devices when I type `$ ls
> /dev/`. By downgrading the kernel, boot process works properly.
> See also Arch Linux bug tracker[2]. There are similar reports on
> Apple devices.
> `dmesg` output in the emergency shell is attached. I guess this issue is
> related to libata, so CCed to Damien Le Moal.

I think that this problem is due to recent PCI subsystem changes which broke Mac
support. The problem show up as the interrupts not being delivered, which in
turn result in the kernel assuming that the drive is not working (see the
timeout error messages in your dmesg output). Hence your boot drive detection
fails and no rootfs to mount.

Adding linux-pci list.

> Regards.
> [1]
> [2]

Damien Le Moal
Western Digital Research

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