[Bug 216539] page fault in t4iov_attach during boot, on Dell CS23-SH motherboards

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216539

            Bug ID: 216539
           Summary: page fault in t4iov_attach during boot, on Dell
                    CS23-SH motherboards
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: asomers at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Dell C23-SH motherboards, on recent versions of stable/11 and head, will panic
with a page fault in t4iov_attach if T4-related modules are loaded at boot
time.  They do not panic if the T4-related modules are loaded later.  Notably,
these machines don't even have a T4 card installed.  Also of note,
hw.pci.enable_pcie_hp=0 is set in loader.conf to workaround PR211699.  A
SuperMicro Sandy Bridge-based system with the same loader.conf settings running
the same version of head didn't panic.

The machine is running FreeBSD 12.0-CURRENT r311461.  It's loader.conf
contains:
kern.geom.label.disk_ident.enable="0"
kern.geom.label.gptid.enable="0"
kern.geom.label.disk_ident.enable="0"
kern.geom.label.gptid.enable="0"
zfs_load="YES"
if_cxgbe_load="YES"
t4_fw_load="YES"
t4_tom_load="YES"
t5_fw_load="YES"
hw.pci.enable_pcie_hp=0

And the panic string is:
Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x0
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff817b269a
stack pointer           = 0x28:0xffffffff81bb57d0
frame pointer           = 0x28:0xffffffff81bb5820
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 (swapper)
trap number             = 12
panic: page fault
cpuid = 0
KDB: stack backtrace:
db_trace_self_wrapper() at 0xffffffff803301fb =
db_trace_self_wrapper+0x2b/frame 0xffffffff81bb5360
vpanic() at 0xffffffff804f3512 = vpanic+0x182/frame 0xffffffff81bb53e0
panic() at 0xffffffff804f3383 = panic+0x43/frame 0xffffffff81bb5440
trap_fatal() at 0xffffffff808181d1 = trap_fatal+0x351/frame 0xffffffff81bb54a0
trap_pfault() at 0xffffffff808183c3 = trap_pfault+0x1e3/frame
0xffffffff81bb5500
trap() at 0xffffffff8081794c = trap+0x26c/frame 0xffffffff81bb5710
calltrap() at 0xffffffff807fbc01 = calltrap+0x8/frame 0xffffffff81bb5710
--- trap 0xc, rip = 0xffffffff817b269a, rsp = 0xffffffff81bb57e0, rbp =
0xffffffff81bb5820 ---
t4iov_attach() at 0xffffffff817b269a = t4iov_attach+0x14a/frame
0xffffffff81bb5820
device_attach() at 0xffffffff80530760 = device_attach+0x420/frame
0xffffffff81bb5880
bus_generic_attach() at 0xffffffff8053194d = bus_generic_attach+0x2d/frame
0xffffffff81bb58a0
pci_attach() at 0xffffffff80390125 = pci_attach+0xd5/frame 0xffffffff81bb58e0
device_attach() at 0xffffffff80530760 = device_attach+0x420/frame
0xffffffff81bb5940
bus_generic_attach() at 0xffffffff8053194d = bus_generic_attach+0x2d/frame
0xffffffff81bb5960
acpi_pcib_acpi_attach() at 0xffffffff8034806a =
acpi_pcib_acpi_attach+0x3ba/frame 0xffffffff81bb59d0
device_attach() at 0xffffffff80530760 = device_attach+0x420/frame
0xffffffff81bb5a30
bus_generic_attach() at 0xffffffff8053194d = bus_generic_attach+0x2d/frame
0xffffffff81bb5a50
acpi_attach() at 0xffffffff8033af1f = acpi_attach+0xdbf/frame
0xffffffff81bb5b10
device_attach() at 0xffffffff80530760 = device_attach+0x420/frame
0xffffffff81bb5b70
bus_generic_attach() at 0xffffffff8053194d = bus_generic_attach+0x2d/frame
0xffffffff81bb5b90
nexus_acpi_attach() at 0xffffffff807f7363 = nexus_acpi_attach+0x73/frame
0xffffffff81bb5bc0
device_attach() at 0xffffffff80530760 = device_attach+0x420/frame
0xffffffff81bb5c20
bus_generic_new_pass() at 0xffffffff80531f89 = bus_generic_new_pass+0xe9/frame
0xffffffff81bb5c50
bus_set_pass() at 0xffffffff8052e3cc = bus_set_pass+0x8c/frame
0xffffffff81bb5c80
configure() at 0xffffffff8087eaa9 = configure+0x9/frame 0xffffffff81bb5c90
mi_startup() at 0xffffffff8047b3a8 = mi_startup+0x118/frame 0xffffffff81bb5cb0
btext() at 0xffffffff8028802c = btext+0x2c
Uptime: 1s

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