[stgt] help tgt segfault

[Jesse Nelson]

I got gdb attached to the running parent process and let it continue
this is in a screen so i should be able to get you more info on the
next crash.

i have tgt setup with about 5 machines mounting different targets.
right now its single head attached to a dell md3k using multipath to the array.
targets are being presented over lvm, and initiators are simply mounting these
file systems(mostly xfs some ocfs2). This is centos5 running a vanilla
kernel

i/o is fairly light, but there may be some network latency in play
here (we have been having issues with some switches).

this box also serves up some a few filesystems over nfs.

plenty of mem / cpu / net..   dual quad core,  8g of mem 2 gig-e
interfaces bonded  using 802.3ad

i am trying to think of anything that may be helpful:)
the modules loaded are:
# lsmod
Module                  Size  Used by
dell_rbu               39968  0
ipv6                  289864  34
ipmi_devintf           41616  2
ipmi_si                72044  1
ipmi_msghandler        63832  2 ipmi_devintf,ipmi_si
bonding               112888  0
binfmt_misc            41868  1
nfsd                  279720  17
lockd                  96080  1 nfsd
nfs_acl                35584  1 nfsd
auth_rpcgss            70816  1 nfsd
exportfs               36864  1 nfsd
sunrpc                211656  86 nfsd,lockd,nfs_acl,auth_rpcgss
scsi_dh_rdac           38788  3
dm_round_robin         35584  1
dm_multipath           48024  2 dm_round_robin
scsi_dh                39172  2 scsi_dh_rdac,dm_multipath
fan                    37768  0
container              36608  0
battery                45192  0
acpi_memhotplug        38276  0
ac                     37640  0
usbhid                 52548  0
hid                    68672  1 usbhid
thermal                51104  0
button                 39968  0
processor              72376  9 thermal
dcdbas                 40240  0
usb_storage           145056  0
i5000_edac             41224  0
dm_snapshot            48456  2
dm_zero                34560  0
dm_mirror              49152  0
dm_log                 41860  1 dm_mirror
dm_mod                 84848  207
dm_multipath,dm_snapshot,dm_zero,dm_mirror,dm_log
ehci_hcd               64396  0

let me know if there is anything else, and thanks heaps ahead of time :)


On Thu, Dec 11, 2008 at 8:05 AM, FUJITA Tomonori
<fujita.tomonori at lab.ntt.co.jp> wrote:
> On Thu, 11 Dec 2008 07:58:30 -0800
> "Jesse Nelson" <spheromak at gmail.com> wrote:
>
>> were running vanila 2.6.27.4 kern with  tgt 0.9.2   with about 30
>> targets and about 10mb/s throughput
>> i am constantly (daily) seeing tgtd segfault. no real deep info just
>> this error in the logs:
>>     segfault at 8 ip 000000000040ebed sp 00007fffb259cb30 error 6 in
>> tgtd[400000+23000]
>> any ideas or suggestions how i can dig deeper here ?
>
> Can you run gdb with tgtd?
>
> If you can't, can you give the very detailed information about what
> you are doing, which enable me to do the same thing you do to
> reproduce the problem.
>
> Thanks,
>
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