Re: [Scst-devel] system crash

[Vladislav B. <vs...@vl...>]

Brad Johnson wrote:
> What are the advantages/disadvantages of using fileio instead of diskio?
> Also, how does the raid device handler work?

The RAID handler is pass-through driver for SCSI device with RAID type
(0xC).

> ...Brad
> 
> 
> On Fri, 2006-05-19 at 12:29 -0400, Ming Zhang wrote:
> 
>>thx for the info. i never run diskio so i am not aware of its stability.
>>maybe Vlad has better idea on this.
>>
>>Ming
>>
>>
>>On Fri, 2006-05-19 at 11:25 -0500, Brad Johnson wrote:
>>
>>>I tried it again, this time using the fileio handler (I exported an
>>>entire device /dev/sda1).
>>>This time I did not have any problems. From the initiator system I ran
>>>an entire bonnie disk I/O test run without failure.
>>>
>>>...Brad
>>>
>>>
>>>On Thu, 2006-05-18 at 18:38 -0400, Ming Zhang wrote:
>>>
>>>>1) can u try latest code from scst cvs
>>>>
>>>>2) can u try to export it via scst_fileio module? see if oops in same
>>>>place.
>>>>
>>>>ming
>>>>
>>>>
>>>>
>>>>
>>>>On Thu, 2006-05-18 at 17:20 -0500, Brad Johnson wrote:
>>>>
>>>>>The system running scst crashes when doing I/O to target from remote
>>>>>system.
>>>>>
>>>>>Here is my setup:
>>>>>My target system has 2 Intel Xeon processors (3.2 MHz) and 1 GB RAM.
>>>>>It is running Linux 2.6.15.7.
>>>>>It has scst-0.9.4 and qla2x00-target-26-0.9.3.8 installed.
>>>>>It has a Qlogic 2312 HBA connected to a switch. This is my FC target
>>>>>host. (My FC Initiator is another x86 system with a Qlogic HBA also
>>>>>connected to the switch.)
>>>>>For back-end devices it has an LSI FC949X HBA connected to a Hitachi
>>>>>Fibre-channel drive.
>>>>>
>>>>>Here is my start script:
>>>>>--------------------------------------------------------
>>>>>modprobe -v qla2x00tgt
>>>>>modprobe -v scst_disk
>>>>>echo "add 2:0:3:0 0" >/proc/scsi_tgt/groups/Default/devices
>>>>>echo "1" >/sys/class/scsi_host/host5/target_mode_enabled
>>>>>--------------------------------------------------------
>>>>>
>>>>>In the script, 2:0:3:0 refers to my Hitachi drive, host5 refers to my
>>>>>Qlogic target-mode port. Everything starts successfully (including
>>>>>scsi_tgt module since it is a dependency of scst_disk).
>>>>>
>>>>>>From my initiator system I see the one drive I have exposed. I
>>>>>successfully partition that drive and do mkfs. At this point everything
>>>>>is still fine. I then mount the file system and copy a big file to it.
>>>>>The copy seems to work fine but at some point shortly after that my
>>>>>target system crashes. There is no oops output to the system log. So I
>>>>>did it again with a remote kgdb attached. Here is the gdb output:
>>>>>
>>>>>
>>>>>Program received signal SIGILL, Illegal instruction.
>>>>>__free_pages (page=0xc190a22c, order=0) at mm/page_alloc.c:1055
>>>>>1055            if (put_page_testzero(page)) {
>>>>>(gdb) bt
>>>>>#0  __free_pages (page=0xc190a22c, order=0) at mm/page_alloc.c:1055
>>>>>#1  0xf8d61efd in scst_release_space (cmd=0xf40a4e58)
>>>>>    at /root/mid-level/scst-0.9.4/src/scst_lib.c:1430
>>>>>#2  0xf8d60b2a in scst_free_cmd (cmd=0xf40a4e58, check_retry=1)
>>>>>    at /root/mid-level/scst-0.9.4/src/scst_lib.c:956
>>>>>#3  0xf8d599ee in scst_finish_cmd (cmd=0xf40a4e58)
>>>>>    at /root/mid-level/scst-0.9.4/src/scst_targ.c:2212
>>>>>#4  0xf8d5a7df in __scst_process_active_cmd (cmd=0xf40a4e58,
>>>>>    context=<value optimized out>, pflags=0xc046cfb8,
>>>>>    left_locked=<value optimized out>)
>>>>>    at /root/mid-level/scst-0.9.4/src/scst_targ.c:2461
>>>>>#5  0xf8d5aa81 in scst_do_job_active (active_cmd_list=0xf8d756d0,
>>>>>    pflags=0xc046cfb8, context=268435457)
>>>>>    at /root/mid-level/scst-0.9.4/src/scst_targ.c:54
>>>>>#6  0xf8d5af99 in scst_cmd_tasklet (p=<value optimized out>)
>>>>>    at /root/mid-level/scst-0.9.4/src/scst_targ.c:2672
>>>>>#7  0xc012d905 in tasklet_action (a=<value optimized out>)
>>>>>    at kernel/softirq.c:267
>>>>>#8  0xc012d552 in __do_softirq () at kernel/softirq.c:95
>>>>>#9  0xc010619e in do_softirq () at arch/i386/kernel/irq.c:187
>>>>>#10 0xc012d689 in irq_exit () at kernel/softirq.c:169
>>>>>#11 0xc010604e in do_IRQ (regs=0xc1cf4f48) at arch/i386/kernel/irq.c:110
>>>>>#12 0xc010499e in common_interrupt () at thread_info.h:91
>>>>>#13 0xc1cf4000 in ?? ()
>>>>>#14 0x00000000 in ?? ()
>>>>>
>>>>>
>>>>>I can reproduce this easily every time. Let me know if you want any
>>>>>further information about this.
>>>>>
>>>>>...Brad Johnson
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>-------------------------------------------------------
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>>>>>_______________________________________________
>>>>>Scst-devel mailing list
>>>>>Scs...@li...
>>>>>https://lists.sourceforge.net/lists/listinfo/scst-devel
>>>>
>>>>
>>>
>>>
>>>-------------------------------------------------------
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>>>Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
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>>
>>
> 
> 
> 
> -------------------------------------------------------
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> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
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