Bug 7906
| Summary: | boot hang unless "nolapic" - ASUS L3C/S laptop | ||
|---|---|---|---|
| Product: | ACPI | Reporter: | Martin Mokrejs (mmokrejs) |
| Component: | Config-Interrupts | Assignee: | acpi_power-processor |
| Status: | REJECTED WILL_NOT_FIX | ||
| Severity: | normal | CC: | acpi-bugzilla |
| Priority: | P2 | ||
| Hardware: | i386 | ||
| OS: | Linux | ||
| Kernel Version: | 2.6.19.2 | Subsystem: | |
| Regression: | --- | Bisected commit-id: | |
| Attachments: |
scree snapshot
dmesg from buggy 2.6.19.2: system boots when no-lapic is added dmesg-no-lapic-no-ioapic.txt acpidump-no-lapic-no-ioapic.bin lapic_and_ioapic.jpg dmesg26231-without-lapic-while-with-ioapic.txt dmesg26231-with-lapic-with-ioapic-acpioff.txt dmesg26231-with-lapic-with-ioapic-but-no-commandline-forced-lapic.txt .config dmesg26231-smp-while-lapic-no-forced.txt .config-smp |
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Description
Martin Mokrejs
2007-01-31 00:56:27 UTC
Created attachment 10235 [details]
scree snapshot
I see, the screen output was really different from the one I have pasted in the
original bugreport. But I am sure you got the clue at which step the kernel
hung.
Is this a regression, or has this always failed? Where any command line options used for the failing boot? Does "nolapic" make the failing kernel boot? If yes, please attach the resulting full dmesg. If no, please build a CONFIG_SMP kernel (includes LAPIC and IOAPIC) boot it on the machine and attach the full dmesg. Created attachment 10248 [details]
dmesg from buggy 2.6.19.2: system boots when no-lapic is added
And, the SMP kernel does not boot. It again locks the system at the same stage as originally reported. The bug exists in 2.6.18, earlier kernels were not tested (at least yet). With 2.6.17 I get a bit further ... I get 19 dots instead of just one as in later kernels: Initializing Device/Processor/Thermal objects by executing _INI methods:. ------------------------------------------------------------------------^ here 19 dots instead of just one before the machine locks up > With 2.6.17
hmmm, still broken -- see if you can go back further.
It isn't unusual for enabling an LAPIC on a uni-processor laptop
to cause all kinds of problems. That is why the BIOS on
such machines generally disable them by default.
Unclear why this BIOS isn't disabling the LAPIC,
or why Linux isn't listening to it if it is.
here's a random suggestion, try "apm=off"
BTW, see my older bugs related to this hardware: #1815, #1903. I think I do remember discussion with Karol Kozimor (sziwan) who had the same laptop telling me some years ago that the LAPIC is disabled by bios and even enabling it it would not help on this piece of hardware. And I do believe it started because the kernel did not boot with this option. ;) I had problems to compile older kernels because of some assembler issue although I tried gcc-4.1.1 and 3.3.6. Anyway, 2.6.13 and 2.6.12.6 behave same as 2.6.17: 19 dots get printed out and then it hangs. Hi, Martin Will you please check whether there exists an option for local apic or I/O apic? If it exists, please enable it and then upload the info of acpidump. At the same time please build a CONFIG_SMP kernel (includes LAPIC and IOAPIC) boot it on the machine and attach the full dmesg. Thanks. Created attachment 13229 [details]
dmesg-no-lapic-no-ioapic.txt
2.6.23.1 without both Local APIC an IO-APIC.
Created attachment 13230 [details]
acpidump-no-lapic-no-ioapic.bin
Created attachment 13234 [details]
lapic_and_ioapic.jpg
The system does not boot when lapic and ioapic are enabled. I get the following hang, different from what I used to get in the past.
Created attachment 13235 [details]
dmesg26231-without-lapic-while-with-ioapic.txt
To boot the non-functional kernel I passed "nolapic" kernel option.
I went to increase the kernel log buffer size and enabled few more debugging options. However, it came to the kernel command line in grub.conf and fown I did have "lapic" on my kernel command line. That seems to have forced LAPIC to be turned on although it was disabled by the BIOS. Once enabled, it locked the computer. So, the subject of this bug is for current kernels wrong. The kernel 2.6.23.1 does report the LAPIC is disabled and leaves it as it is, so the machine boots although LAPIC support is compiled into the kernel (from my initial report and comments I have the impression it did not work like this before). So, I would name the bug now that forcing LAPIC formerly disabled by BIOS really hangs the machine, which is probably quite expected. I will attach the two kernel logs, compare the kernel command lines used (the same kernel with both IOAPIC and LAPIC enabled, and HIGHMEM). If you really want me to test also SMP (comment #10) please let me know. Created attachment 13236 [details]
dmesg26231-with-lapic-with-ioapic-acpioff.txt
Created attachment 13237 [details]
dmesg26231-with-lapic-with-ioapic-but-no-commandline-forced-lapic.txt
See, unless I force lapic on kernel command line the machine boots up.
-Local APIC disabled by BIOS -- reenabling.
-Found and enabled local APIC!
-mapped APIC to ffffb000 (fee00000)
+Local APIC disabled by BIOS -- you can enable it with "lapic"
+mapped APIC to ffffb000 (01ecc000)
Hi, Martin Thanks for your effort. Please retest the system using the latest stable kernel .For example, 2.6.23. (Enable SMP, Local APIC and I/O APIC in kernel configuration). Please confirm whether there is the option for Local apic and i/o APIC in BIOS settting. If it exists , please enable it. It is helpful that the file of complete dmesg and .config is uploaded. Created attachment 13241 [details]
.config
Yesterday I have tested 2.6.23.1, and here is the .config file.
Created attachment 13248 [details]
dmesg26231-smp-while-lapic-no-forced.txt
There are no ACPI options in the bios at all. I cannot turn on ACPI 2.0 as on many other ASUS motherboards, I cannot enable/disable Hyperthreading, just nothing except passwords, IDE master/slave controller and boot order.
The SMP+IOAPIC+APIC kernel boots fine unless I force "lapic" on kernel command line. In such a case it hangs with exactly same message as in #10235 attached image snapshot.
Here I attach the dmesg from the bootup when no "lapic" was present on kernel command line.
Created attachment 13249 [details]
.config-smp
The SMP+IOAPIC+LAPIC enabled kernel config.
(In reply to comment #20) > Created an attachment (id=13248) [details] > dmesg26231-smp-while-lapic-no-forced.txt > > There are no ACPI options in the bios at all. I cannot turn on ACPI 2.0 as on > many other ASUS motherboards, I cannot enable/disable Hyperthreading, just > nothing except passwords, IDE master/slave controller and boot order. > > The SMP+IOAPIC+APIC kernel boots fine unless I force "lapic" on kernel > command > line. In such a case it hangs with exactly same message as in #10235 attached > image snapshot. > > Here I attach the dmesg from the bootup when no "lapic" was present on kernel > command line. > it sounds to me as the issue is gone. As Len said, forcing lapic in use on a machine where bios disabled lapic would cause some problem. So I will mark this bug as will_not_fix.. Please reopen if I misunderstand some where... I think I aggree that at least as of now it is a users fault forcing lapic on a lapic-disabled BIOS machine. ;) |