[Bug 267028] kernel panics when booting with both (zfs,ko or vboxnetflt,ko or acpi_wmi.ko) and amdgpu.ko

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267028

--- Comment #297 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Mark Millard from comment #294)

Updated patch that does some checking of the
stages between which the odd value shows up:

# git -C /usr/alt-src diff sys/kern/kern_linker.c
diff --git a/sys/kern/kern_linker.c b/sys/kern/kern_linker.c
index 5271d002fba4..2f94d2cca356 100644
--- a/sys/kern/kern_linker.c
+++ b/sys/kern/kern_linker.c
@@ -1475,6 +1475,18 @@ sys_kldsym(struct thread *td, struct kldsym_args *uap)
        return (error);
 }

+#define MODLIST_NEWMOD_HIST_SLOTS 256
+static char const* modlist_newmod_lookup_name=         NULL;                  
   // NULL: No problem found.
+static int         modlist_newmod_hist_pos=           
MODLIST_NEWMOD_HIST_SLOTS; // First use will wrap to 0 first.
+static int         modlist_newmod_tqe_next_changed_at=
MODLIST_NEWMOD_HIST_SLOTS; // I.E.: No such found.
+static modlist_t   modlist_newmod_tqe_next_newvalue=   NULL;                  
   // NULL: No such found.
+static struct modlist_newmod_hist_type {
+       modlist_t     modAddr;
+       linker_file_t containerAddr;
+       char const*   modnameAddr;
+       int           version;
+} modlist_newmod_hist[MODLIST_NEWMOD_HIST_SLOTS];
+
 /*
  * Preloaded module support
  */
@@ -1484,6 +1496,17 @@ modlist_lookup(const char *name, int ver)
 {
        modlist_t mod;

+       int modlist_newmod_rescan_start_at = 0;
+       if (16 <= modlist_newmod_hist_pos) modlist_newmod_rescan_start_at=
modlist_newmod_hist_pos-16;
+       for (int scan_pos= modlist_newmod_rescan_start_at;
scan_pos<modlist_newmod_hist_pos; ++scan_pos)
+               if(modlist_newmod_hist[scan_pos].modAddr->link.tqe_next !=
modlist_newmod_hist[scan_pos+1].modAddr)
+               {
+                       modlist_newmod_lookup_name=         name;
+                       modlist_newmod_tqe_next_changed_at= scan_pos;
+                       modlist_newmod_tqe_next_newvalue=  
modlist_newmod_hist[scan_pos].modAddr->link.tqe_next;
+                       panic("modlist_lookup: a prior tqe_next changed!");
+               }
+
        TAILQ_FOREACH(mod, &found_modules, link) {
                if (strcmp(mod->name, name) == 0 &&
                    (ver == 0 || mod->version == ver))
@@ -1521,8 +1544,21 @@ modlist_newmodule(const char *modname, int version,
linker_file_t container)
        modlist_t mod;

        mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO);
+
+       ++modlist_newmod_hist_pos;
+       if (MODLIST_NEWMOD_HIST_SLOTS<=modlist_newmod_hist_pos)
modlist_newmod_hist_pos= 0;
+#undef MODLIST_NEWMOD_HIST_SLOTS
+       modlist_newmod_hist[modlist_newmod_hist_pos].modAddr=       mod;
+       modlist_newmod_hist[modlist_newmod_hist_pos].containerAddr= container;
+       modlist_newmod_hist[modlist_newmod_hist_pos].modnameAddr=   modname;
+       modlist_newmod_hist[modlist_newmod_hist_pos].version=       version;
+
        if (mod == NULL)
                panic("no memory for module list");
+
+       if (mod < (modlist_t)0xfffff80000000100)
+               panic("modlist_newmodule: mod <
(modlist_t)PHYS_TO_DMAP(0x100)");
+
        mod->container = container;
        mod->name = modname;
        mod->version = version;

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