Date: Sat, 28 Apr 2012 17:04:00 GMT From: Dave Vasilevsky <dave@vasilevsky.ca> To: freebsd-gnats-submit@FreeBSD.org Subject: amd64/167393: MacBook4,1 hangs on SMP boot Message-ID: <201204281704.q3SH405a025873@red.freebsd.org> Resent-Message-ID: <201204281710.q3SHA59W043865@freefall.freebsd.org>
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>Number: 167393
>Category: amd64
>Synopsis: MacBook4,1 hangs on SMP boot
>Confidential: no
>Severity: serious
>Priority: low
>Responsible: freebsd-amd64
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sat Apr 28 17:10:04 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator: Dave Vasilevsky
>Release: 9.0-RELEASE
>Organization:
>Environment:
FreeBSD anzio 9.0-RELEASE FreeBSD 9.0-RELEASE #0: Tue Jan 3 07:46:30 UTC 2012 root@farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64
>Description:
Kernel hangs early in boot just after printing "ACPI APIC Table: <APPLE Apple00>", and a few seconds later starts printing something so quickly I can't read it. Boot process does not continue.
This sounds similar to bug 151385, but it's hard to tell if it's the same, and that bug is with an older kernel.
>How-To-Repeat:
Start up a MacBook4,1 from the FreeBSD-9.0-RELEASE-amd64-dvd1 DVD, observe that boot hangs and doesn't continue. Booting from an already installed FreeBSD 9.0 system will also produce this bug.
>Fix:
Turning off SMP (setting kern.smp.disabled=1 in loader) causes the bug to go away. This is how I was able to test an installed system. Losing use of the second CPU is non-optimal, though.
Alternatively, patching sys/amd64/amd64/machdep.c to add MacBook4,1 to the LEGACY_USB_EN blacklist makes the bug go away too. I haven't noticed any negative side effects. However, if I boot using grub2 instead of loader(8), the bug still manifests, even with this patch.
Patch attached with submission follows:
--- sys/amd64/amd64/machdep.c.bak 2012-04-22 08:54:09.236707582 -0400
+++ sys/amd64/amd64/machdep.c 2012-04-22 08:54:33.477730871 -0400
@@ -225,6 +225,7 @@
if (sysenv != NULL) {
if (strncmp(sysenv, "MacBook1,1", 10) == 0 ||
strncmp(sysenv, "MacBook3,1", 10) == 0 ||
+ strncmp(sysenv, "MacBook4,1", 10) == 0 ||
strncmp(sysenv, "MacBookPro1,1", 13) == 0 ||
strncmp(sysenv, "MacBookPro1,2", 13) == 0 ||
strncmp(sysenv, "MacBookPro3,1", 13) == 0 ||
>Release-Note:
>Audit-Trail:
>Unformatted:
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