Bug 206200

Summary:	CAM status: command timeout
Product:	Base System	Reporter:	sasamotikomi
Component:	kern	Assignee:	freebsd-bugs (Nobody) <bugs>
Status:	Closed FIXED
Severity:	Affects Some People	CC:	grahamperrin, smh
Priority:	---	Keywords:	regression
Version:	10.1-RELEASE
Hardware:	Any
OS:	Any

Description sasamotikomi 2016-01-13 14:07:57 UTC

Problem with new (P)ATA-CAM implementation:
After update from 9.1 to 9.2 caused many kernel panics:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193380#c14
It's gone after update to 10.1 and back again as cam issue after few security update (via freebsd-update):

ada0:ata0:0:0:0): READ_DMA. ACB: c8 00 20 5a 5f 43 00 00 00 00 08 00                                                           
(ada0:ata0:0:0:0): CAM status: ATA Status Error                                                                                 
(ada0:ata0:0:0:0): ATA status: 51 (DRDY SERV ERR), error: 40 (UNC )                                                             
(ada0:ata0:0:0:0): RES: 51 40 24 5a 5f 03 03 00 00 00 00                                                                        
(ada0:ata0:0:0:0): Retrying command                                                                                             
(ada0:ata0:0:0:0): READ_DMA. ACB: c8 00 20 5a 5f 43 00 00 00 00 08 00                                                           
(ada0:ata0:0:0:0): CAM status: ATA Status Error                                                                                 
(ada0:ata0:0:0:0): ATA status: 51 (DRDY SERV ERR), error: 40 (UNC )                                                             
(ada0:ata0:0:0:0): RES: 51 40 24 5a 5f 03 03 00 00 00 00                                                                        
(ada0:ata0:0:0:0): Retrying command                                                                                             
(ada0:ata0:0:0:0): READ_DMA. ACB: c8 00 20 5a 5f 43 00 00 00 00 08 00                                                           
(ada0:ata0:0:0:0): CAM status: ATA Status Error                                                                                 
(ada0:ata0:0:0:0): ATA status: 51 (DRDY SERV ERR), error: 40 (UNC )                                                             
(ada0:ata0:0:0:0): RES: 51 40 24 5a 5f 03 03 00 00 00 00                                                                        
(ada0:ata0:0:0:0): Retrying command                                                                
(ada0:ata0:0:0:0): Retrying command                                                                                             
(ada0:ata0:0:0:0): READ_DMA. ACB: c8 00 20 5a 5f 43 00 00 00 00 08 00                                                           
(ada0:ata0:0:0:0): CAM status: ATA Status Error                                                                                 
(ada0:ata0:0:0:0): ATA status: 51 (DRDY SERV ERR), error: 40 (UNC )                                                             
(ada0:ata0:0:0:0): RES: 51 40 24 5a 5f 03 03 00 00 00 00                                                                        
(ada0:ata0:0:0:0): Error 5, Retries exhausted                                                                                   
g_vfs_done():ada0s2a[READ(offset=7672586240, length=4096)]error = 5 

Possible partially related with this bug:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=119838
Patch for ATA:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199495