On Tue, 06 Jan 2026 16:56:07 +0100, Mikulas Patocka wrote:
> On the kernel 6.19-rc, I am experiencing 15-second boot stall in a
> virtual machine when probing a virtio-scsi disk:
> [ 1.011641] SCSI subsystem initialized
> [ 1.013972] virtio_scsi virtio6: 16/0/0 default/read/poll queues
> [ 1.015983] scsi host0: Virtio SCSI HBA
> [ 1.019578] ACPI: \_SB_.GSIA: Enabled at IRQ 16
> [ 1.020225] ahci 0000:00:1f.2: AHCI vers 0001.0000, 32 command slots, 1.5
> Gbps, SATA mode
> [ 1.020228] ahci 0000:00:1f.2: 6/6 ports implemented (port mask 0x3f)
> [ 1.020230] ahci 0000:00:1f.2: flags: 64bit ncq only
> [ 1.024688] scsi host1: ahci
> [ 1.025432] scsi host2: ahci
> [ 1.025966] scsi host3: ahci
> [ 1.026511] scsi host4: ahci
> [ 1.028371] scsi host5: ahci
> [ 1.028918] scsi host6: ahci
> [ 1.029266] ata1: SATA max UDMA/133 abar m4096@0xfea23000 port 0xfea23100
> irq 16 lpm-pol 1
> [ 1.029305] ata2: SATA max UDMA/133 abar m4096@0xfea23000 port 0xfea23180
> irq 16 lpm-pol 1
> [ 1.029316] ata3: SATA max UDMA/133 abar m4096@0xfea23000 port 0xfea23200
> irq 16 lpm-pol 1
> [ 1.029327] ata4: SATA max UDMA/133 abar m4096@0xfea23000 port 0xfea23280
> irq 16 lpm-pol 1
> [ 1.029341] ata5: SATA max UDMA/133 abar m4096@0xfea23000 port 0xfea23300
> irq 16 lpm-pol 1
> [ 1.029356] ata6: SATA max UDMA/133 abar m4096@0xfea23000 port 0xfea23380
> irq 16 lpm-pol 1
> [ 1.118111] scsi 0:0:0:0: Direct-Access QEMU QEMU HARDDISK 2.5+
> PQ: 0 ANSI: 5
> [ 1.348916] ata1: SATA link down (SStatus 0 SControl 300)
> [ 1.350713] ata2: SATA link down (SStatus 0 SControl 300)
> [ 1.351025] ata6: SATA link down (SStatus 0 SControl 300)
> [ 1.351160] ata5: SATA link down (SStatus 0 SControl 300)
> [ 1.351326] ata3: SATA link down (SStatus 0 SControl 300)
> [ 1.351536] ata4: SATA link down (SStatus 0 SControl 300)
> [ 1.449153] input: ImExPS/2 Generic Explorer Mouse as
> /devices/platform/i8042/serio1/input/input2
> [ 16.483477] sd 0:0:0:0: Power-on or device reset occurred
> [ 16.483691] sd 0:0:0:0: [sda] 2097152 512-byte logical blocks: (1.07
> GB/1.00 GiB)
> [ 16.483762] sd 0:0:0:0: [sda] Write Protect is off
> [ 16.483877] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled,
> doesn't support DPO or FUA
> [ 16.569225] sd 0:0:0:0: [sda] Attached SCSI disk
>
> [...]
Applied, thanks!
[1/1] blk-mq: avoid stall during boot due to synchronize_rcu_expedited
commit: 9670db22e7ab4aefe2b2619589a47fef9d3e0c7e
Best regards,
--
Jens Axboe
