misc/150390: zfs deadlock when arcmsr reports drive faulted

[Rich Ercolani]

>Number:         150390
>Category:       misc
>Synopsis:       zfs deadlock when arcmsr reports drive faulted
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Sep 08 16:10:02 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     Rich Ercolani
>Release:        8.1
>Organization:
JHU ACM
>Environment:
FreeBSD manticore.acm.jhu.edu 8.1-STABLE FreeBSD 8.1-STABLE #4 r211397M: Mon Aug 16 18:47:31 EDT 2010     root at manticore.acm.jhu.edu:/usr/obj/usr/local/ncvs/src/sys/DTRACE  amd64

>Description:
System deadlocks 100% reliably when a disk is reported FAULTED in the arcmsr card.

dmesg looks like:
arcmsr0:block 'read/write' command with gone raid volume Cmd= 8, TargetId=1, Lun=5 
arcmsr0:block 'read/write' command with gone raid volume Cmd= 8, TargetId=1, Lun=5 
arcmsr0:block 'read/write' command with gone raid volume Cmd= 8, TargetId=1, Lun=5 

zpool and zfs-related commands, and all IO to the affected pool, hang forever in state D.

procstat reports:
[root at manticore ~]# ps aux | grep zpool
stump  3287  0.0  0.0 15700  1540   0  D+   12:03PM   0:00.00 zpool status
root   3286  0.0  0.0 15700  1528   1  T+   12:03PM   0:00.00 zpool status
root   3316  0.0  0.0  9120  1164   3  S+   12:07PM   0:00.00 grep zpool
[root at manticore ~]# procstat -k 3286
  PID    TID COMM             TDNAME           KSTACK                       
 3286 100484 zpool            -                mi_switch sleepq_wait _cv_wait spa_config_enter spa_config_generate spa_open_common spa_get_stats zfs_ioc_pool_stats zfsdev_ioctl devfs_ioctl_f kern_ioctl ioctl syscall Xfast_syscall 
[root at manticore ~]# procstat -k 3287
  PID    TID COMM             TDNAME           KSTACK                       
 3287 100532 zpool            -                mi_switch sleepq_wait _cv_wait spa_config_enter spa_config_generate spa_open_common spa_get_stats zfs_ioc_pool_stats zfsdev_ioctl devfs_ioctl_f kern_ioctl ioctl syscall Xfast_syscall 

>How-To-Repeat:
1) Have a disk fault on an arcmsr card.
2) Hang!
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: