freebsd stable - Oct 2015 - Reloading iscsi target, iscsi initiator panics

On 1015T2005, Frank de Bot (lists) wrote:
> Edward Tomasz Napiera?a wrote:
> > On 1014T2316, Frank de Bot (lists) wrote:
> >> Hello,
> >>
> >> I have a FreeBSD 10.2 server running as iSCSI target. Another
FreeBSD
> >> 10.2 is an initiator and has several targets used.
> >>
> >> When I add a target and reload its config with 'service ctld
reload',
> >> the FreeBSD initiator server panics. It's reproducable (I have
a
> >> coredump, but I think it's clear what the problem is)
> > 
> > How easy it is to reproduce, eg. does it happen about every time?
> > Could you paste the backtrace?
> 
> The first time I didn't understand what happened, the second time I
> could relate it directly to the reloading of ctld on the iSCSI, within
> moments the server paniced.
> 
> I got 2 backtraces:
> 
> First one:
> 
> Fatal trap 12: page fault while in kernel mode
> cpuid = 1; softdep_deallocate_dependencies: got error 6 while accessing
This is the FFS on the initiator side panicing because the device it's
on went away.  The softupdates code can't handle that very well.

I have no idea why the devices went away and then reappeared, as visible
in the logs.  What has the changed in the ctl.conf?  Do you have any
iscsi-related sysctls set on the initiator side?

Edward Tomasz Napiera?a wrote:
> On 1015T2005, Frank de Bot (lists) wrote:
>> Edward Tomasz Napiera?a wrote:
>>> On 1014T2316, Frank de Bot (lists) wrote:
>>>> Hello,
>>>>
>>>> I have a FreeBSD 10.2 server running as iSCSI target. Another
FreeBSD
>>>> 10.2 is an initiator and has several targets used.
>>>>
>>>> When I add a target and reload its config with 'service
ctld reload',
>>>> the FreeBSD initiator server panics. It's reproducable (I
have a
>>>> coredump, but I think it's clear what the problem is)
>>>
>>> How easy it is to reproduce, eg. does it happen about every time?
>>> Could you paste the backtrace?
>>
>> The first time I didn't understand what happened, the second time I
>> could relate it directly to the reloading of ctld on the iSCSI, within
>> moments the server paniced.
>>
>> I got 2 backtraces:
>>
>> First one:
>>
>> Fatal trap 12: page fault while in kernel mode
>> cpuid = 1; softdep_deallocate_dependencies: got error 6 while accessing
> 
> This is the FFS on the initiator side panicing because the device it's
> on went away.  The softupdates code can't handle that very well.
> 
> I have no idea why the devices went away and then reappeared, as visible
> in the logs.  What has the changed in the ctl.conf?  Do you have any
> iscsi-related sysctls set on the initiator side?
> 
I've added a new target in the ctl.conf . On the linux server I also see
a brief disconnect,  but a reconnect is handled well.

I haven't set any sysctl's related to iscsi

My ctl.conf is (again anonymized):

auth-group my-auth {
        chap "myiscsi" "verysecret"
}
portal-group pg0 {
        discovery-auth-group my-auth
        listen 10.13.37.2
}

target iqn.2015-03.lan.my.nas:vmstorage-29 {
        auth-group my-auth
        portal-group pg0
        lun 0 {
                path /tank/images/iscsi/vmstorage-29/vmstorage-29.img
                size 20484M
                blocksize 4096
                option unmap on
        }
}

target iqn.2015-03.lan.my.nas:vmstorage-44 {
        auth-group my-auth
        portal-group pg0
        lun 0 {
                path /tank/images/iscsi/vmstorage-44/vmstorage-44.img
                size 102404M
                blocksize 4096
                option unmap on
        }
}

target iqn.2015-03.lan.my.nas:keyserver.my.nl {
        auth-group my-auth
        portal-group pg0
        lun 0 {
                path /dev/zvol/tank/hosting_images/keyserver.my.nl
                blocksize 4096
                option unmap on
        }
}

the vmstorage-44 is last added to the config


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