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SubjectRe: [patch] Real-Time Preemption, -VP-2.6.9-rc4-mm1-U1
>there wasnt all that much missing for SELINUX + PREEMPT_REALTIME
>support. Could you try the patch below - does it fix your box?

Alas no, it actually seemed to make things worse. After
/etc/rc3.d/S10network start

I got a few dumps (too fast to see) and then the following BUG.
[top of screen]
Modules linked in: iptable_filter ip_tables 8139too mii dm_mod uhci_hcd
ext3 jbd
CPU: 1
EIP: 0060:[<c0316366>] Not tainted VLI
EFLAGS: 00000002 (2.6.9-rc4-mm1-VP-U1a) [only change is your patch...]
eax: 00000002 ebx: c1405820 ecx: 0104cf60 edx: 00000001
esi: c166a000 edi: 00000002 ebp: c166bf04 esp: c166bef8
ds: 007b es: 007b ss: 0068 preempt: 00010003
Process ksoftirqd/1 (pid: 5, threadinfo=c166a000 task=c1658000)
Stack: 00000001 c1405820 c1435820 c166bf18 c011bc30 c1436200 c1405820
c166bf48 c011c766 c1435820 c1405820 c166bf38 00000002 c1658000
00000001 c1436200 00000001 0104cf60 c166bfa4 c0315433 00000001
Call Trace:
[<c011bc30>] double_lock_balance+0x40/0x50
[<c011c766>] load_balance_newidle+0x66/0xc0
[<c0315433>] schedule+0x733/0x830
[<c0114b30>] mcount+0x14/0x18
[<c01280b4>] ksoftirq+0xd4/0xf0
[<c01382b0>] kthread+0x0/0xc0
[<c0105b19>] kernel_thread_helper+0x5/0xc
Code: bf 00 00 00 00 55 89 e5 83 ec 0c 89 5d f8 89 75 fc e8 cb e7 df ff c7
04 24
01 00 00 00 89 c3 e8 d1 3e e2 ff be 00 e0 ff ff 21 e6 <31> c0 86 03 84 c0
7e 0a
8b 5d f8 8b 7f fc 89 ec 5d c3 c7

Rebooting to see if I was just "unlucky"...

Checking the log file after reboot, it appears I do have a trace to send
[next message...]. Trying again.

Different crash but at basically the same step. Getting tired of typing
in from the other screen...
EIP is at sub_preempt_count+0x5f+0xa0
preempt: 00010003

Call Trace:
[<c0316384>] _spin_lock+0x44/0x70
[<c011bc30>] double_lock_balance+0x40/0x50
[<c011c766>] load_balance_newidle+0x66/0xc0
[<c0315433>] schedule+0x733/0x830
[<c0114b30>] mcount+0x14/0x18
[<c01280b4>] ksoftirq+0xd4/0xf0
[<c013836b>] kthread+0xbb/0xc0
[<c0127fe0>] ksoftirq+0x0/0xf0
[<c01382b0>] kthread+0x0/0xc0
[<c0105b19>] kernel_thread_helper+0x5/0xc
... console shuts up ...

Try a third time with max_cpus=1

OK. Made it past S10network start, with just a couple messages about a
sleeping function called from invalid context; looks like a new cause
and will send you that in the next message too.

Did a couple other commands (less, ls) without problem. Tried
./S13portmap start
and the machine locked up (no response to Ctrl-C). Alt-SysRq-T did
display something. Alt-SysRq-S did an Emergency Sync (but also dumped

[top of screen]
in atomic():1 [00000001], irqs_disabled():0
[<c011f26a>] __might_sleep+0xca/0xe0
[<c0138de9>] _mutex_lock+0x29/0x70
[<c0138e86>] _mutex_lock_irqsave+0x16/0x20
[<c014c932>] pdflush_operation+0x32/0xd0
[<c01691ad>] emergency_sync+0x1d/0x30
[<c01690e0>] do_sync+0x0/0x90
[<c0217456>] __handle_sysrq+0x76/0xf0
[<c0210b1d>] kbd_event+0xad/0x110
[<c028da8b>] input_event+0xfb/0x3f0
[<c0114b30>] mcount+0x14/0x18
[<c0291923>] atkbd_report_key+0x43/0xa0
[<c0291ba6>] atkbd_interrupt+0x226/0x590
[<c0225f54>] serio_interrupt+0x54/0xa3
[<c0226681>] i8042_interrupt+0xc1/0x1a0
[<c01440b6>] handle_IRQ_event+0x46/0x80
[<c01448c0>] do_hardirq+0x70/0xf0
[<c0144a41>] do_irqd+0x101/0x1d0
[<c013836b>] kthread+0xbb/0xc0
[<c0144940>] do_irqd+0x0/0x1d0
[<c01382b0>] kthread+0x0/0xc0
[<c0105b19>] kernel_thread_helper+0x5/0xc
Emergency Sync complete

So there's appears to be a problem in Alt-SysRq handling as well.
Alt-SysRq-P doesn't show anything, not sure why.
Alt-SysRq-M appears to work OK.
Alt-SysRq-B works too :-).

Will bring up -T3 soon and send the messages on disk in a separate

--Mark H Johnson

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