[Bug 199117] Kernel panic when iSCSI drops

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199117

            Bug ID: 199117
           Summary: Kernel panic when iSCSI drops
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: rwestlun at gmail.com

I'm using iSCSI to connect to a remote drive over an SSH tunnel.  When the
connection drops, I get a kernel panic and reboot.  This has occurred three
times in the past three days.

dmesg:

WARNING: localhost (iqn.cryo): no ping reply (NOP-In) after 5 seconds;
reconnecting
WARNING: localhost (iqn.cryo): no ping reply (NOP-In) after 5 seconds;
reconnecting
Fatal trap 9: general protection fault while in kernel mode
cpuid = 0; apic id = 00
instruction pointer     = 0x20:0xffffffff802e1b6e
stack pointer           = 0x28:0xfffffe0119c68ae0
frame pointer           = 0x28:0xfffffe0119c68b10
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 0 (iscsimt)
trap number             = 9
panic: general protection fault
cpuid = 0
KDB: stack backtrace:
#0 0xffffffff80963000 at kdb_backtrace+0x60
#1 0xffffffff80928125 at panic+0x155
#2 0xffffffff80d24f0f at trap_fatal+0x38f
#3 0xffffffff80d24b6c at trap+0x75c
#4 0xffffffff80d0a772 at calltrap+0x8
#5 0xffffffff81e43f47 at iscsi_session_terminate_task+0x57
#6 0xffffffff81e43ed0 at iscsi_session_cleanup+0x1c0
#7 0xffffffff81e43a78 at iscsi_maintenance_thread+0x58
#8 0xffffffff808f8b6a at fork_exit+0x9a
#9 0xffffffff80d0acae at fork_trampoline+0xe
Uptime: 15h46m39s
(da0:iscsi1:0:0:0): SYNCHRONIZE CACHE(10). CDB: 35 00 00 00 00 00 00 00 00 00 
(da0:iscsi1:0:0:0): CAM status: Command timeout
(da0:iscsi1:0:0:0): Error 5, Retries exhausted
(da0:iscsi1:0:0:0): Synchronize cache failed
Automatic reboot in 15 seconds - press a key on the console to abort
Rebooting...
Copyright (c) 1992-2014 The FreeBSD Project.



System info:

GENERIC kernel

uname -a

FreeBSD legion.textplain.net 10.1-RELEASE-p6 FreeBSD 10.1-RELEASE-p6 #0: Tue
Feb 24 19:00:21 UTC 2015    
root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64

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