RE: Latency traces I cannot interpret (sa1100, 2.6.15-rc7-rt1)

[kus Kusche Klaus]

> From: Daniel Walker
> On Tue, 2006-01-03 at 09:00 +0100, kus Kusche Klaus wrote:
> > > From: Daniel Walker
> > > Here's a more updated patch, the should replace the other 
> > > patch I sent.
> > > I think the tracing error is the result of a missed interrupt 
> > > enable in
> > > the ARM assembly code. I've only compile tested this.  
> > 
> > Compiles, but BUGs immediately after uncompressing (second line of
> > console output) and then runs into an infinite Oops loop...
> > Reproducible.
> 
> Ok, yet another patch. This one uses the correct lowlevel calls, and I
> fixed the call ordering.

Hmmm, it changes a few flag and register values (e.g. lr),
but basically it gives the same BUG and Oops.

As the first BUG is very early: 
Is it possible that tracing gets called before it is initialized?


Uncompressing
Linux.................................................................
done, booting the kernel.
BUG: bad raw irq-flag value 600000d3, swapper/0!
Linux version 2.6.15-rc7-rt1 (kk@silver) (gcc version 3.4.4) #23 PREEMPT
Tue Jan 3 14:56:50 CET 2006
CPU: StrongARM-1110 [6901b118] revision 8 (ARMv4)
Machine: Keba KETOP
Ignoring unrecognised tag 0x00000000
Memory policy: ECC disabled, Data cache writeback
MM: invalid domain in supersection mapping for 0x8000000000 at
0xea000000
MM: invalid domain in supersection mapping for 0x18000000000 at
0xf0000000
ketop map io done
Real-Time Preemption Support (C) 2004-2005 Ingo Molnar
Built 1 zonelists
Kernel command line: root=31:02 rootfstype=ext2 console=ttySA0,38400n8
console=tty0
WARNING: experimental RCU implementation.
PID hash table entries: 512 (order: 9, 8192 bytes)
Warning: uninitialized Real Time Clock
Console: colour dummy device 80x30
Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
Memory: 64MB = 64MB total
Memory: 61148KB available (1606K code, 2041K data, 80K init)
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
Unable to handle kernel NULL pointer dereference at virtual address
000000c0
pgd = c0204000
[000000c0] *pgd=00000000
Internal error: Oops: 0 [#1]
Modules linked in:
CPU: 0
PC is at 0xc0
LR is at __init_begin+0x3fdf8000/0x2c
pc : [<000000c0>]    lr : [<00000000>]    Not tainted
sp : c00a1fb0  ip : 00000000  fp : 00000000
r10: 00000000  r9 : c00a0000  r8 : 00000001
r7 : 00000000  r6 : 00000000  r5 : 00000000  r4 : 00000000
r3 : 00000000  r2 : 80000093  r1 : 00000000  r0 : 00000000
Flags: Nzcv  IRQs off  FIQs on  Mode SVC_32  Segment kernel
Control: C020717F  Table: C020717F  DAC: 00000017
Process swapper (pid: 1, stack limit = 0xc00a0194)
Stack: (0xc00a1fb0 to 0xc00a2000)
1fa0:                                     00000000 00000000 c021c084
c02345f8 
1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 
1fe0: 00000000 00000000 00000000 c021d94c 00000013 00000000 ffffffff
ffffffff 
Backtrace: no frame pointer
Code: <1>Unable to handle kernel NULL pointer dereference at virtual
address 000000c0
pgd = c0204000
[000000c0] *pgd=00000000
Internal error: Oops: 0 [#2]
Modules linked in:
CPU: 0
PC is at 0xc0
LR is at 0xc0
pc : [<000000c0>]    lr : [<000000c0>]    Not tainted
sp : c00a1e74  ip : c00a1e74  fp : c00a1ecc
r10: c05bf9c0  r9 : 00000093  r8 : c00a1fb0
r7 : 000000c0  r6 : 00000000  r5 : c00a1ea8  r4 : ffffffff
r3 : 00000001  r2 : 60000093  r1 : c03b1548  r0 : c038c508
Flags: nzCv  IRQs off  FIQs on  Mode SVC_32  Segment kernel
Control: C020717F  Table: C020717F  DAC: 00000017
Process swapper (pid: 1, stack limit = 0xc00a0194)
Stack: (0xc00a1e74 to 0xc00a2000)
1e60:                                              00000009 00000001
000000b0 
1e80: 00000000 fffffffc c00a0000 00000000 000000c0 c00a1fb0 c00a1f68
c05bf9c0 
1ea0: c00a1ecc c00a1de0 c00a1ebc c024cda4 c0385770 00000093 ffffffff
00000000 
1ec0: c00a1eec c00a1ed0 c0222b60 c0220f60 000000c0 c05bf9c0 c00a0000
00000000 
1ee0: c00a1f28 c00a1ef0 c0222e3c c0222afc 00000000 c025034c 001da3de
00000000 
1f00: 000000c0 c00a1f9c c00a0000 00000000 c00a1f68 80000093 00000000
c00a1f54 
1f20: c00a1f2c c0222e8c c0222c4c 00000010 ffffffff c00a1f9c 00000000
00000000 
1f40: 00000001 00000000 c00a1f64 c00a1f58 c0223028 c0222e60 00000000
c00a1f68 
1f60: c021ca60 c022301c 00000000 00000000 80000093 00000000 00000000
00000000 
1f80: 00000000 00000000 00000001 c00a0000 00000000 00000000 00000000
c00a1fb0 
1fa0: 00000000 000000c0 80000093 ffffffff 00000000 00000000 c021c084
c02345f8 
1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 
1fe0: 00000000 00000000 00000000 c021d94c 00000013 00000000 ffffffff
ffffffff 
Backtrace: 
[<c0220f54>] (die+0x0/0x344) from [<c0222b60>]
(__do_kernel_fault+0x70/0x84)
[<c0222af0>] (__do_kernel_fault+0x0/0x84) from [<c0222e3c>]
(do_page_fault+0x1fc/0x214)
 r7 = 00000000  r6 = C00A0000  r5 = C05BF9C0  r4 = 000000C0
[<c0222c40>] (do_page_fault+0x0/0x214) from [<c0222e8c>]
(do_translation_fault+0x38/0xc4)
[<c0222e54>] (do_translation_fault+0x0/0xc4) from [<c0223028>]
(do_PrefetchAbort+0x18/0x1c)
[<c0223010>] (do_PrefetchAbort+0x0/0x1c) from [<c021ca60>]
(__pabt_svc+0x40/0x80)
Code: <1>Unable to handle kernel NULL pointer dereference at virtual
address 000000c0
pgd = c0204000
[000000c0] *pgd=00000000
Internal error: Oops: 0 [#3]
Modules linked in:
CPU: 0
PC is at 0xc0
LR is at 0xc0
pc : [<000000c0>]    lr : [<000000c0>]    Not tainted
sp : c00a1d38  ip : c00a1d38  fp : c00a1d90
r10: c05bf9c0  r9 : 00000093  r8 : c00a1e74
r7 : 000000c0  r6 : 00000000  r5 : c00a1d6c  r4 : ffffffff
r3 : 00000002  r2 : 60000093  r1 : c03b1548  r0 : c038c508
Flags: nzCv  IRQs off  FIQs on  Mode SVC_32  Segment kernel
Control: C020717F  Table: C020717F  DAC: 00000017
Process swapper (pid: 1, stack limit = 0xc00a0194)
Stack: (0xc00a1d38 to 0xc00a2000)
1d20:                                                       00000009
00000001 
1d40: 000000b0 00000000 fffffffc c00a0000 00000000 000000c0 c00a1e74
c00a1e2c 
1d60: c05bf9c0 c00a1d90 0000c024 c00a1d80 000000c0 c0385770 00000093
ffffffff 
1d80: 00000000 c00a1db0 c00a1d94 c0222b60 c0220f60 000000c0 c05bf9c0
c00a0000 
1da0: 00000000 c00a1dec c00a1db4 c0222e3c c0222afc 000000b0 c05bf9c0
c00a1e70 
1dc0: 00000000 000000c0 c00a1e60 c00a0000 00000000 c00a1e2c 20000093
c05bf9c0 
1de0: c00a1e18 c00a1df0 c0222e8c c0222c4c 00000000 ffffffff c00a1e60
00000000 
1e00: 000000c0 c00a1fb0 c05bf9c0 c00a1e28 c00a1e1c c0223028 c0222e60
c00a1ecc 
1e20: c00a1e2c c021ca60 c022301c c038c508 c03b1548 60000093 00000001
ffffffff 
1e40: c00a1ea8 00000000 000000c0 c00a1fb0 00000093 c05bf9c0 c00a1ecc
c00a1e74 
1e60: c00a1e74 000000c0 000000c0 20000093 ffffffff 00000009 00000001
000000b0 
1e80: 00000000 fffffffc c00a0000 00000000 000000c0 c00a1fb0 c00a1f68
c05bf9c0 
1ea0: c00a1ecc c00a1de0 c00a1ebc c024cda4 c0385770 00000093 ffffffff
00000000 
1ec0: c00a1eec c00a1ed0 c0222b60 c0220f60 000000c0 c05bf9c0 c00a0000
00000000 
1ee0: c00a1f28 c00a1ef0 c0222e3c c0222afc 00000000 c025034c 001da3de
00000000 
1f00: 000000c0 c00a1f9c c00a0000 00000000 c00a1f68 80000093 00000000
c00a1f54 
1f20: c00a1f2c c0222e8c c0222c4c 00000010 ffffffff c00a1f9c 00000000
00000000 
1f40: 00000001 00000000 c00a1f64 c00a1f58 c0223028 c0222e60 00000000
c00a1f68 
1f60: c021ca60 c022301c 00000000 00000000 80000093 00000000 00000000
00000000 
1f80: 00000000 00000000 00000001 c00a0000 00000000 00000000 00000000
c00a1fb0 
1fa0: 00000000 000000c0 80000093 ffffffff 00000000 00000000 c021c084
c02345f8 
1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 
1fe0: 00000000 00000000 00000000 c021d94c 00000013 00000000 ffffffff
ffffffff 
Backtrace: 
[<c0220f54>] (die+0x0/0x344) from [<c0222b60>]
(__do_kernel_fault+0x70/0x84)
[<c0222af0>] (__do_kernel_fault+0x0/0x84) from [<c0222e3c>]
(do_page_fault+0x1fc/0x214)
 r7 = 00000000  r6 = C00A0000  r5 = C05BF9C0  r4 = 000000C0
[<c0222c40>] (do_page_fault+0x0/0x214) from [<c0222e8c>]
(do_translation_fault+0x38/0xc4)
[<c0222e54>] (do_translation_fault+0x0/0xc4) from [<c0223028>]
(do_PrefetchAbort+0x18/0x1c)
[<c0223010>] (do_PrefetchAbort+0x0/0x1c) from [<c021ca60>]
(__pabt_svc+0x40/0x80)
[<c0220f54>] (die+0x0/0x344) from [<c0222b60>]
(__do_kernel_fault+0x70/0x84)
[<c0222af0>] (__do_kernel_fault+0x0/0x84) from [<c0222e3c>]
(do_page_fault+0x1fc/0x214)
 r7 = 00000000  r6 = C00A0000  r5 = C05BF9C0  r4 = 000000C0
[<c0222c40>] (do_page_fault+0x0/0x214) from [<c0222e8c>]
(do_translation_fault+0x38/0xc4)
[<c0222e54>] (do_translation_fault+0x0/0xc4) from [<c0223028>]
(do_PrefetchAbort+0x18/0x1c)
[<c0223010>] (do_PrefetchAbort+0x0/0x1c) from [<c021ca60>]
(__pabt_svc+0x40/0x80)

-- 
Klaus Kusche                 (Software Development - Control Systems)
KEBA AG             Gewerbepark Urfahr, A-4041 Linz, Austria (Europe)
Tel: +43 / 732 / 7090-3120                 Fax: +43 / 732 / 7090-6301
E-Mail: kus@xxxxxxxx                                WWW: www.keba.com
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