[Bug 71231] New: System unresponsable after a lot of LUNs have been added to the system

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=71231

            Bug ID: 71231
           Summary: System unresponsable after a lot of LUNs have been
                    added to the system
           Product: IO/Storage
           Version: 2.5
    Kernel Version: 3.10.32
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: SCSI
          Assignee: linux-scsi@vger.kernel.org
          Reporter: alexandernaumann@gmx.de
        Regression: No

Created attachment 127581
  --> https://bugzilla.kernel.org/attachment.cgi?id=127581&action=edit
Kernel config

This Kernel crash is reproducable on my system.
Right now I could get it with 3.10.25 and 3.10.32.
I works fine with 3.1.

The system (Dell R910, nut it also happens with other servers) has a QLogic
FC-HBA (qla2xxx driver).
After connection about 30 LUNs the system is working fine, but if I increase
the amount of FC-LUNs to for example 40 the system hangs afetr some seconds.

Maybe this bug has been already fixed by Suse:
http://kernel.suse.com/cgit/kernel-source/tree/patches.fixes/mm-resched-to-avoid-rcu-stall-during-boot-large-machines.patch?h=SLE11-SP3&id=6780159bba20e9f99dd5ac8a4e18f98f9c93adf7

If it is the case I think this patch should be put into current kernel lines.

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