* [uml-devel] Re: [uml-user] Host 2.6.2/3 + CFQ + BlaisorBlade patches == host panic
[not found] ` <013d01c3f7f5$23ae2790$0201a8c0@hawk>
@ 2004-02-22 14:49 ` BlaisorBlade
2004-02-22 22:11 ` Christopher S. Aker
0 siblings, 1 reply; 2+ messages in thread
From: BlaisorBlade @ 2004-02-22 14:49 UTC (permalink / raw)
To: Christopher S. Aker, user-mode-linux-devel; +Cc: user-mode-linux-user
Alle 22:04, venerdì 20 febbraio 2004, Christopher S. Aker ha scritto:
> Hello,
>
> I've been testing 2.6 and SKAS and receive the following BUG on both 2.6.2
> and 2.6.3. Patches applied are (in order):
>
> *
> http://www.user-mode-linux.org/~blaisorblade/patches/2.6.2-v1/uml-patch-2.6
>.2-0.bz2 *
> http://www.user-mode-linux.org/~blaisorblade/patches/2.6.2-v1/00-Combo-v1.b
>z2 *
> http://www.user-mode-linux.org/~blaisorblade/patches/2.6.2-v1-host-skas2/00
>-2.6.2-v1-host-SKAS2.patch.bz2
Yes, this is the right order - this means that maybe I could explain it
properly, this time (a huge number of people said that my instructions were
confusing, and probably they are right).
* the CFQ patch from the -mm tree
> * patch-2.6.3 (only on the 2.6.3 kernel, obviously)
>
> kernel BUG at include/asm/mmu_context.h:53!
> invalid operand: 0000 [#1]
> CPU: 2
> EIP: 0060:[<c011dff1>] Not tainted
> EFLAGS: 00010083
> EIP is at schedule+0x53e/0x6c5
> eax: 00000100 ebx: f57e0d00 ecx: 00000002 edx: f57e0d00
> esi: f640c6b0 edi: c3da1c80 ebp: f7f97f78 esp: f7f97f24
> ds: 007b es: 007b ss: 0068
> Process swapper (pid: 0, threadinfo=f7f96000 task=f7f9ece0)
> Stack: f640c6b0 3ee9c9d5 00000185 f7f97f30 e3cd6000 00000200 00000001
> c0451b88 f640c6b0 3ee9c9d5 00000185 f640c6b0 c3da1c80 0001ab57 3ee9cded
> 00000185 f7f9ece0 f7f9eeac f7f96000 f7f96000 c010882e f7f96000 c010ac89
> f7f96000 Call Trace:
> [<c010882e>] default_idle+0x0/0x2d
> [<c010ac89>] need_resched+0x27/0x32
> [<c010882e>] default_idle+0x0/0x2d
> [<c0108858>] default_idle+0x2a/0x2d
> [<c01088cc>] cpu_idle+0x37/0x40
> [<c012314e>] printk+0x188/0x1d0
> [<c045c51d>] print_cpu_info+0x86/0xd2
>
> Code: 0f 0b 35 00 34 3a 3a c0 eb c5 89 5e 6c f0 ff 43 18 b8 00 e0
>
> Does this look like it could be caused by the SKAS patches, or would you
> suspect the CFQ patch? The box seems to run fine, but once I fire up a few
> UMLs and start banging around, the host will BUG.
Ok. It is very probably the 2.6 Skas patch (I've not looked at the CFQ patch,
but it seems very unlikely that it can cause such problems). You are probably
the first one who tries it with CONFIG_SMP enabled: look at
include/asm-i386/mmu_context.h to see this code:
#ifdef CONFIG_SMP
else {
cpu_tlbstate[cpu].state = TLBSTATE_OK;
BUG_ON(cpu_tlbstate[cpu].active_mm != next); /*!!!!This is the
bug you hit*/
...
So you have enabled CONFIG_SMP, right? In that situation the code above needs
to be changed - I need some more thinking to understand what must be done.
Actually, I've not yet understood how the skas patch can make that test fail -
so it could be innocent.
If you want to use SKAS now, you could, as a workaround, disable CONFIG_SMP,
if you have just one HyperThreading processor. If you cannot, just wait.
--
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729
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