[Bug 219866] [iscsi] ctld crashes inside ctl_datamove()

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219866

            Bug ID: 219866
           Summary: [iscsi] ctld crashes inside ctl_datamove()
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: emz at norma.perm.ru

System info
===========
FreeBSD san01.bsh-ru.playkey.net 11.0-RELEASE-p7 FreeBSD 11.0-RELEASE-p7 #2
r314026M: Wed Mar 29 06:54:29 UTC 2017    
emz at san01.bsh-ru.playkey.net:/usr/obj/usr/src/sys/SAN  amd64

I have a bunch of FreeBSD's that run ctld and are used as iSCSI target. One of
the started to crash periodically after the load was increased twice. "M" in
the uname stands for the patchs that trasz at FreeBSD.org gave me (and it fixes
some other issue, and isn't probably related to this one, because the system
was running just fine with it for several months until the load has increased)
and also for increasing the target limit beyond 512.

I have a bunch of crashdumps from this system indicating that the crash happens
inside the ctl_datamove() call.


This system also complains in dmesg pretty often about

[...]
ctl_datamove: tag 0x293a4d on (23:34:0) aborted
ctl_datamove: tag 0x293a4e on (23:34:0) aborted
ctl_datamove: tag 0x1fe2d9 on (7:34:0) aborted
ctl_datamove: tag 0x293a50 on (23:34:0) aborted
ctl_datamove: tag 0x21e6cd on (15:34:0) aborted
ctl_datamove: tag 0x21e6ce on (15:34:0) aborted
ctl_datamove: tag 0xe453b on (10:34:0) aborted
ctl_datamove: tag 0x21e6cf on (15:34:0) aborted
ctl_datamove: tag 0x61c355 on (9:34:0) aborted
ctl_datamove: tag 0x10cf20 on (2:34:0) aborted
ctl_datamove: tag 0xe453d on (10:34:0) aborted
ctl_datamove: tag 0x174e97 on (28:34:0) aborted
[...]

Don't know if it's related, so I decided to mention it.

Since the size of these crashdumps is enormous (several gigabytes each), I've
put them on the web-server (not the one hosted on the affected system).

They can be found here (autoindexed location): http://files2.enaza.ru/freebsd/

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