Re: Panic: _at_r323525: iflib

> Previous successful build was:
> FreeBSD g1-252.catwhisker.org 12.0-CURRENT FreeBSD 12.0-CURRENT #398  r323483M/323489:1200044: Tue Sep 12 04:31:08 PDT 2017     root_at_g1-252.catwhisker.org:/common/S4/obj/usr/src/sys/CANARY  amd64
> 
> The usual historical information, including a verbose-boot dmesg.boot
> from the above-cited build, may be found at
> <http://www.catwhisker.org/~david/FreeBSD/history/>.
> 
> I will try hand-transcribing some of the lock & backtrace info:
> 
> ...
> em0: allocated for 1 rx_queues
> Kernel page fault with the following non-sleepable locks held:
> exclusive sleep mutex taskqgroup (taskqgroup) r = 0 (0xfffffe07be2e4800) locked _at_ /usr/src/sys/kern/subr_gtaskqueue.c:803
> stack backtrace:  [which I am abbreviating at this point -- dhw]
> #0 ... at witness_debugger+0x73
> #1 ... at witness_warn+0x43f
> #2 ... at trap_pfault+0x53
> #3 ... at trap+0x2c5
> #4 ... at calltrap+0x8
> #5 ... at iflib_device_register+0x2a61
> #6 ... at iflib_device_attach+0xb7
> #7 ... at device_attach+0x3ee
> #8 ... at bus_generic_attach+0x5a
> #9 ... at pci_attach+0xd5
> #10 ... at device_attach+0x3ee
> #11 ... at bus_generic_attach+0x5a
> #12 ... at acpi_pcib_acpi_attach+0x3bc
> #13 ... at device_attach+0x3ee
> #14 ... at bus_generic_attach+0x5a
> #15 ... at acpi_attach+0xe85
> #16 ... at device_attach+0x3ee
> #17 ... at bus_generic_attach+0x5a
> 
> Fatal trap 12: page fault while in kernel mode
> cpuid = 2; apic id = 02
> fault virtual address   = 0xffffffff8b530c20
> fault code              = supervisor write data, page not present
> ...
> [ thread pid 0 tid 100000 ]
> Stopped at      0xffffffff80a743b0 = taskqgroup_attach+0x230:    orq   %rax,-0x 58(%rbp,%xrx,8)
> 
> I can provide more specific excerpts, but I need to focus on some
> other activities for a while.
> 
> Peace,
> david
> 


When you get a chance, let me know what em(4) device is in your machine
(pciconf -lvbc).  I'll see if I have one around here to test.

I'm assuming you do *not* have any iflib or em(4) tuning options set either.

sean