Date: Wed, 30 Dec 2020 08:43:17 -0800 From: Neel Chauhan <neel@neelc.org> To: freebsd-hackers@freebsd.org Subject: Debugging a WIP PCI/ACPI patch: Bad tailq NEXT(0xffffffff81cde660->tqh_last) != NULL Message-ID: <44528336fa9168966d121bf771e1e229@neelc.org>
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Hi all,
I'm writing a patch to support the VMD subsystem in Intel TigerLake
systems such as the HP Spectre x360 13t-aw200. VMD is needed for NVMe
here.
The patch is as follows
--- a/sys/dev/vmd/vmd.c
+++ b/sys/dev/vmd/vmd.c
@@ -66,13 +66,20 @@ struct vmd_type {
#define INTEL_VENDOR_ID 0x8086
#define INTEL_DEVICE_ID_VMD 0x201d
#define INTEL_DEVICE_ID_VMD2 0x28c0
+#define INTEL_DEVICE_ID_VMD3 0x9a0b
static struct vmd_type vmd_devs[] = {
{ INTEL_VENDOR_ID, INTEL_DEVICE_ID_VMD, "Intel Volume
Management Device" },
{ INTEL_VENDOR_ID, INTEL_DEVICE_ID_VMD2, "Intel Volume
Management Device" },
+ { INTEL_VENDOR_ID, INTEL_DEVICE_ID_VMD3, "Intel Volume
Management Device" },
{ 0, 0, NULL }
However, when I use the patch, I get a kernel panic related to PCI:
https://imgur.com/a/XUQksOi (sorry for the image)
It gives me the Bad tailq NEXT(0xffffffff81cde660->tqh_last) != NULL
error.
Could you please help me figure out why it's panicking?
-Neel
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