kern/142802: [ata] [panic] on removing drive: recursed on non-recursive mutex ATA state lock

[Floris Bos]

>Number:         142802
>Category:       kern
>Synopsis:       [ata] [panic] on removing drive: recursed on non-recursive mutex ATA state lock
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Jan 14 01:40:01 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     Floris Bos
>Release:        FreeBSD 9 - January snapshot
>Organization:
>Environment:
FreeBSD 9.0-CURRENT-201001
>Description:
On removing a SATA drive from the system, the following panic occurs:

==
panic: _mtx_lock_sleep: recursed on non-recursive mutex ATA state lock @ /usr/src/sys/dev/ata/ata-all.c:321

cpuid = 1
KDB: enter: panic
[thread pid 0 tid 100027 ]
Stopped at kdb_enter+0x3d: movq $0,0x6aefb0(%rip)
==

System is a HP DL120 G6, on-board Intel AHCI controller.


>How-To-Repeat:

>Fix:


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