[Bug 219399] System panics after several hours of 14-threads-compilation orgies using poudriere on AMD Ryzen...

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219399

--- Comment #3 from Nils Beyer <nbe at renzel.net> ---
Unfortunately, it seems it's not relevant; I've inserted the code from the
first link:
--------------------------------------------------------------------------------
root at asbach:/usr/src/#svnlite diff
Index: sys/amd64/amd64/sigtramp.S
===================================================================
--- sys/amd64/amd64/sigtramp.S  (revision 319101)
+++ sys/amd64/amd64/sigtramp.S  (working copy)
@@ -47,6 +47,13 @@
 0:     hlt                             /* trap priviliged instruction */
        jmp     0b

+       /*
+       * Work around a Ryzen bug (say whut?).  There appears to be an
+       * issue with the kernel iretq'ing to a %rip near the end of the
+       * user address space (top of stack).
+       */
+       .space  1088
+
        ALIGN_TEXT
 esigcode:
--------------------------------------------------------------------------------

compiled the kernel, rebooted and started a poudriere bulk build. Crashed after
3h34min with:

    panic: vm_fault: fault on nofault entry, addr: fffffe00131fb000

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