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From: Maxim Bourmistrov <maxim@prisjakt.nu>
Subject: Re: kern/179299: [igb] Intel X540-T2 - unstable driver
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The following reply was made to PR kern/179299; it has been noted by GNATS.

From: Maxim Bourmistrov <maxim@prisjakt.nu>
To: bug-followup@FreeBSD.org,
 sysop@prisjakt.nu
Cc:  
Subject: Re: kern/179299: [igb] Intel X540-T2 - unstable driver
Date: Mon, 10 Jun 2013 13:32:32 +0200

 I was able to reproduce this issue on one of two identical machines, but =
 this is not 100% possible.
 However I was able to crash this machine, while trying to reproduce, =
 with the following stack trace.
 Thus no longer sure if my original problem IS cksum6/tso6 related.
 
 Fatal trap 12: page fault while in kernel mode
 cpuid =3D 0; apic id =3D 00
 fault virtual address	=3D 0x18
 fault code		=3D supervisor write data, page not present
 instruction pointer	=3D 0x20:0xffffffff805a220c
 stack pointer	        =3D 0x28:0xffffff917c839910
 frame pointer	        =3D 0x28:0xffffff917c8399d0
 code segment		=3D base 0x0, limit 0xfffff, type 0x1b
 			=3D DPL 0, pres 1, long 1, def32 0, gran 1
 processor eflags	=3D interrupt enabled, resume, IOPL =3D 0
 current process		=3D 12 (irq283: ix0:que 0)
 trap number		=3D 12
 panic: page fault
 cpuid =3D 0
 KDB: stack backtrace:
 #0 0xffffffff80955276 at kdb_backtrace+0x66
 #1 0xffffffff8091c5ee at panic+0x1ce
 #2 0xffffffff80cab720 at trap_fatal+0x290
 #3 0xffffffff80caba81 at trap_pfault+0x211
 #4 0xffffffff80cac034 at trap+0x344
 #5 0xffffffff80c953c3 at calltrap+0x8
 #6 0xffffffff805a28e6 at ixgbe_msix_que+0x86
 #7 0xffffffff808ed80d at intr_event_execute_handlers+0xfd
 #8 0xffffffff808eeffe at ithread_loop+0x9e
 #9 0xffffffff808ea49f at fork_exit+0x11f
 #10 0xffffffff80c958ee at fork_trampoline+0xe
 Uptime: 13m13s
 
 
 //maxim=