kern/157534: [mpt] freeze when disk is removed/died from geom_mirror/zfs raid

Eugene M. Zheganin emz at norma.perm.ru
Thu Jun 23 12:10:13 UTC 2011


The following reply was made to PR kern/157534; it has been noted by GNATS.

From: "Eugene M. Zheganin" <emz at norma.perm.ru>
To: bug-followup at FreeBSD.org, eugene at zhegan.in
Cc:  
Subject: Re: kern/157534: [mpt] freeze when disk is removed/died from geom_mirror/zfs
 raid
Date: Thu, 23 Jun 2011 17:42:12 +0600

 The thing is, that after disk removal the controller sends two types of 
 events: 0x12 and 0x16.
 According to the mpi_ioc.h the first is MPI_EVENT_SAS_PHY_LINK_STATUS 
 and the second is MPI_EVENT_SAS_DISCOVERY.
 
 Furthermore, according to the kernel messages on the console during the 
 drive removal/attaching, and the code in mpt_cam.c, mpt_cam_event() does 
 nothing to handle these events (they both are handled by 'default:' 
 section). I think this leads to freezing.
 
 Comparing to the linux mpt code, I can say that Linux kernel does 
 nothing about MPI_EVENT_SAS_PHY_LINK_STATUS, but it definitely does 
 something (which my skills are to low to understand to) about 
 MPI_EVENT_SAS_DISCOVERY.
 
 Anyway, my skills are to low to correct this.
 
 IPKVM screenshots of drive removal and insertion (shot 1 - removal, shot 
 3 - insertion):
 http://unix.zhegan.in/files/mpt_cam_event01.jpeg
 http://unix.zhegan.in/files/mpt_cam_event02.jpeg
 http://unix.zhegan.in/files/mpt_cam_event03.jpeg
 


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