Re: [Scst-devel] system crash

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I tried it with the latest code from CVS (as of 8:00 AM CDT 05/19/2006).
It goes a while longer before crashing this time, and fails in a
different place. This test again used scst_disk handler. I will next try
using the scst_fileio module and will let you know the results.
Here is the GDB output for this failure:

Program received signal SIGILL, Illegal instruction.
__scst_process_active_cmd (cmd=0xea340d14, context=<value optimized
out>,
    pflags=0xf1488fd4, left_locked=1)
    at /root/mid-level/cvs_version/src/scst_targ.c:2494
2494                            BUG();
(gdb) bt
#0  __scst_process_active_cmd (cmd=0xea340d14, context=<value optimized
out>,
    pflags=0xf1488fd4, left_locked=1)
    at /root/mid-level/cvs_version/src/scst_targ.c:2494
#1  0xf8d88b8c in scst_do_job_active (active_cmd_list=0xf8dab8f0,
    pflags=0xf1488fd4, context=268435459)
    at /root/mid-level/cvs_version/src/scst_targ.c:54
#2  0xf8d88f2b in scst_cmd_thread (arg=<value optimized out>)
    at /root/mid-level/cvs_version/src/scst_targ.c:2662
#3  0xc01024d9 in kernel_thread_helper () at
arch/i386/kernel/process.c:298

(gdb) print *cmd
$2 = {cmd_list_entry = {next = 0xf8dab900, prev = 0xf8dab900},
  sess = 0xe92800a8, state = 9, sent_to_midlev = 0, ua_ignore = 0,
  atomic = 0, non_atomic_only = 1, internal = 0, retry = 0, blocking =
0,
  data_buf_alloced = 0, expected_values_set = 1, processible_env = 1,
  cmd_flags = 0, tgtt = 0xf8c39f40, dev = 0xf5b1a340, lun = 0,
  tgt_dev = 0xd1b2309c, scsi_req = 0x0, sn = 20668,
search_cmd_list_entry = {
    next = 0xe92800d0, prev = 0xe92800d0},
  cdb = "(\000\003\uffff\000?\000\000\b\000\000\000\000\000\000",
cdb_len = 10,
  queue_type = SCST_CMD_QUEUE_UNTAGGED, timeout = 15000, retries = 0,
  data_direction = DMA_FROM_DEVICE,
  expected_data_direction = DMA_FROM_DEVICE, expected_transfer_len =
4096,
  data_len = 4096, scst_cmd_done = 0xf8d83080 <scst_cmd_done_local>,
  sgv = 0xecc606c0, bufflen = 4096, buffer = 0xecc606d4, use_sg = 1,
  get_sg_buf_entry_num = 0, status = 0 '\0', masked_status = 0 '\0',
  msg_status = 0 '\0', host_status = 0, driver_status = 0,
  sense_buffer = '\0' <repeats 95 times>, tgt_dev_saved = 0x0,
  tgt_resp_flags = 2, resp_data_len = 4096, mgmt_cmd = 0x0,
  extra_cmd_list_entry = {next = 0x100100, prev = 0x200200}, cmd_saved =
0x0,
  tag = 18824, tgt_specific = 0xe32b09bc, tgt_dev_specific = 0x0}
(gdb)

...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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> 