Regression v6.11 booting cannot mount harddisks (xfs)

[Jesper Dangaard Brouer <hawk@kernel.org>]

Hi Linus,

My testlab kernel devel server isn't booting correctly on v6.11 branches 
(e.g. net-next at 6.11.0-rc5)
I just confirmed this also happens on your tree tag: v6.11-rc7.

The symptom/issue is that harddisk dev names (e.g /dev/sda, /dev/sdb, 
/dev/sdc) gets reordered.  I switched /etc/fstab to use UUID's instead 
(which boots on v6.10) but on 6.11 it still cannot mount harddisks and 
doesn't fully boot.

E.g. errors:
   systemd[1]: Expecting device 
dev-disk-by\x2duuid-0c2b348d\x2de013\x2d482b\x2da91c\x2d029640ec427a.device 
- /dev/disk/by-uuid/0c2b348d-e013-482b-a91c-029640ec42
7a...
   [DEPEND] Dependency failed for var-lib.mount - /var/lib.
   [...]
   [ TIME ] Timed out waiting for device 
dev-d…499e46-b40d-4067-afd4-5f6ad09fcff2.
   [DEPEND] Dependency failed for boot.mount - /boot.

That corresponds to fstab's:
  - UUID=8b499e46-b40d-4067-afd4-5f6ad09fcff2 /boot     xfs defaults 0 0
  - UUID=0c2b348d-e013-482b-a91c-029640ec427a /var/lib/ xfs defaults 0 0

It looks like disk controller initialization happens in *parallel* on
these newer kernels as dmesg shows init printk's overlapping:

  [    5.683393] scsi 5:0:0:0: Direct-Access     ATA      SAMSUNG 
MZ7KM120 003Q PQ: 0 ANSI: 5
  [    5.683641] scsi 7:0:0:0: Direct-Access     ATA      SAMSUNG 
MZ7KM120 003Q PQ: 0 ANSI: 5
  [    5.683797] scsi 8:0:0:0: Direct-Access     ATA      Samsung SSD 
840  BB0Q PQ: 0 ANSI: 5
  [...]
  [    7.057376] sd 5:0:0:0: [sda] 234441648 512-byte logical blocks: 
(120 GB/112 GiB)
  [    7.062279] sd 7:0:0:0: [sdb] 234441648 512-byte logical blocks: 
(120 GB/112 GiB)
  [    7.070628] sd 5:0:0:0: [sda] Write Protect is off
  [    7.070701] sd 8:0:0:0: [sdc] 488397168 512-byte logical blocks: 
(250 GB/233 GiB)

Perhaps this could be a hint to what changed?

Any hints what commit I should try to test revert?
Or good starting point for bisecting?

--Jesper


Extra system info that might be relevant:

00:11.4 SATA controller: Intel Corporation C610/X99 series chipset sSATA 
Controller [AHCI mode] (rev 05) (prog-if 01 [AHCI 1.0])
         Kernel driver in use: ahci

00:1f.2 SATA controller: Intel Corporation C610/X99 series chipset 
6-Port SATA Controller [AHCI mode] (rev 05) (prog-if 01 [AHCI 1.0])
         Subsystem: Super Micro Computer Inc Device 0834
         Kernel driver in use: ahci

$ lsb_release  -a
LSB Version:	:core-5.0-amd64:core-5.0-noarch
Distributor ID:	Fedora
Description:	Fedora release 40 (Forty)
Release:	40
Codename:	Forty