Re: [Scst-devel] system crash

[Ming Z. <min...@gm...>]

On Fri, 2006-05-19 at 21:51 +0400, Vladislav Bolkhovitin wrote:
> 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).
> 

no intention for insulting, have u ever tested with such device? most HW
raid i saw only export TYPE_DISK.




> > ...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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> >>>>
> >>>>
> >>>
> >>>
> >>>-------------------------------------------------------
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> >>
> >>
> > 
> > 
> > 
> > -------------------------------------------------------
> > Using Tomcat but need to do more? Need to support web services, security?
> > Get stuff done quickly with pre-integrated technology to make your job easier
> > Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
> > http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
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