Only boots with CONFIG_SCSI_MQ_DEFAULT=y

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Hello, please cc me I'm not subscribed.

Beginning with commit 64d513ac "scsi: use host wide tags by default" my
system will ONLY boot with CONFIG_SCSI_MQ_DEFAULT=y. Tested through
git-stable master (0adb328 v4.16).

It never gets far enough to log anything, but here are a few boot
messages that I copied by hand (so do not rely on their accuracy):
 ________________________________________________

 Exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x6 Frozen

 ...

 ata2: SRST failed (errno = -16)
 ata2: reset failed, giving up
 ata2: nv: skipping hard reset on occupied port

 ...

 ata2.00: disabled
 ata2: EH complete
 ________________________________________________
 
It doesn't always happen in the same place, but 95% of the time it
freezes late into run level 3 when the GTK immodule cache is updated.

Affected hardware messages (from a successful boot using SCSI_MQ_DEFAULT=y):
[    0.184013] SCSI subsystem initialized
[    0.184207] libata version 3.00 loaded.
[    0.434160] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 250)
[    1.357484] sata_nv 0000:00:0e.0: version 3.5
[    1.357885] sata_nv 0000:00:0e.0: Using SWNCQ mode
[    1.358785] scsi host1: sata_nv
[    1.359070] ata2: SATA max UDMA/133 cmd 0xe80 ctl 0xe00 bmdma 0xe008 irq 21
[    4.848023] ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[    4.867282] ata2.00: ATA-7: SAMSUNG HD502HI, 1AG01118, max UDMA7
[    4.867723] ata2.00: 976773168 sectors, multi 16: LBA48 NCQ (depth 31/32)
[    4.887272] ata2.00: configured for UDMA/133
[    4.888439] scsi 1:0:0:0: Direct-Access     ATA      SAMSUNG HD502HI  1118 PQ: 0 ANSI: 5
[    4.890456] sd 1:0:0:0: [sdf] 976773168 512-byte logical blocks: (500 GB/466 GiB)
[    4.890926] sd 1:0:0:0: [sdf] Write Protect is off
[    4.891370] sd 1:0:0:0: [sdf] Mode Sense: 00 3a 00 00
[    4.893682] sd 1:0:0:0: [sdf] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[    4.896117]  sdf: sdf1 sdf2

Thanks,
 William



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