> From: [email protected]
> On 12/29/05, kus Kusche Klaus <[email protected]> wrote:
> > My sa1100-based system panics while booting with
> 2.6.15-rc7-rt1 when the
> > SLAB allocator is configured. Everything is fine with the SLOB
> > allocator.
> >
> > Please cc me, I'm currently not subscribed.
> >
> > Memory: 62856KB available (1552K code, 381K data, 80K init)
> > Unhandled fault: alignment exception (0xc0207003) at 0x0000015b
> > Internal error: : c0207003 [#1]
> > Modules linked in:
> > CPU: 0
> > PC is at get_page_from_freelist+0x1c/0x3d8
> > LR is at __alloc_pages+0x5c/0x2ac
>
> Unfortunately, I am clueless of arm (and have no idea what alignment
> exception is) but the problem is probably related to mm/slab.c using
> alloc_pages_node() whereas mm/slob.c uses get_free_page(). Do you have
> CONFIG_BUG enabled? If not, please turn it on to see if gfp_zone()
> catches an invalid GFP flag coming from the slab.
CONFIG_BUG was on. I turned on some more debugging CONFIGs
(SLAB, PREEMPT, IRQ_FLAGS, VM, BUGVERBOSE, ERRORS), retried, and got
this
(note the very early BUG and two "MM: invalid domain"):
Uncompressing
Linux............................................................. done,
booting the kernel.
BUG: bad raw irq-flag value 600000d3, swapper/0!
[<c021fd68>] (dump_stack+0x0/0x24) from [<c0249560>]
(check_raw_flags+0x50/0x5c)
[<c0249510>] (check_raw_flags+0x0/0x5c) from [<c0249ff0>]
(__down_trylock+0x140/0x15c)
[<c0249eb0>] (__down_trylock+0x0/0x15c) from [<c024aa4c>]
(rt_down_trylock+0x20/0x164)
[<c024aa2c>] (rt_down_trylock+0x0/0x164) from [<c023152c>]
(vprintk+0x2a0/0x374)
r6 = C0374720 r5 = C0399FD0 r4 = C03D92A4
[<c023128c>] (vprintk+0x0/0x374) from [<c023161c>] (printk+0x1c/0x20)
[<c0231600>] (printk+0x0/0x20) from [<c0208694>]
(start_kernel+0x1c/0x19c)
r3 = 00000000 r2 = 800000D3 r1 = C039C068 r0 = C0374720
[<c0208678>] (start_kernel+0x0/0x19c) from [<c0208094>]
(__enable_mmu+0x0/0x2c)
r4 = C020717D
---------------------------
| preempt count: 00000002 ]
| 2-level deep critical section nesting:
----------------------------------------
.. [<00000000>] .... __init_begin+0x3fdf8000/0x2c
.....[<00000000>] .. ( <= __init_begin+0x3fdf8000/0x2c)
.. [<c024b78c>] .... add_preempt_count+0x1c/0x20
.....[<c02312ac>] .. ( <= vprintk+0x20/0x374)
Linux version 2.6.15-rc7-rt1 (kk@silver) (gcc version 3.4.4) #9 PREEMPT
Thu Dec 29 14:00:29 CET 2005
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: console=ttySA0,38400n8 root=31:02 rootfstype=ext2
WARNING: experimental RCU implementation.
PID hash table entries: 512 (order: 9, 8192 bytes)
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: 62904KB available (1520K code, 372K data, 76K init)
Unhandled fault: alignment exception (0xc0207003) at 0x00000163
Internal error: : c0207003 [#1]
Modules linked in:
CPU: 0
PC is at get_page_from_freelist+0x1c/0x400
LR is at __alloc_pages+0x68/0x2c0
pc : [<c0257cac>] lr : [<c02580f8>] Not tainted
sp : c0399e78 ip : c0399ec0 fp : c0399ebc
r10: c039d724 r9 : c03a29d8 r8 : 00000000
r7 : c039c068 r6 : 000000d0 r5 : c03a2994 r4 : c039d724
r3 : 00000044 r2 : 0000000b r1 : 00000000 r0 : 000200d0
Flags: nzCv IRQs on FIQs off Mode SVC_32 Segment kernel
Control: C020717F Table: C020717F DAC: 00000017
Process swapper (pid: 0, stack limit = 0xc0398194)
Stack: (0xc0399e78 to 0xc039a000)
9e60: 000008b5
000008f1
9e80: 40000053 fffff70f c039d724 c021a4bc 000200d0 c039d724 c03a2994
000000d0
9ea0: c039c068 00000000 c03a29d8 c039d724 c0399ef8 c0399ec0 c02580f8
c0257c9c
9ec0: 000200d0 c0399ed0 00000010 c024951c 00000010 c03a2994 00000000
c021a860
9ee0: 00000000 c03a29d8 000000d0 c0399f30 c0399efc c026bc4c c025809c
00000001
9f00: 000000d0 00000000 c03a2994 00000000 c0398000 000000d0 c03a29d8
c03ee20c
9f20: c026cff0 c0399f5c c0399f34 c026b8bc c026b970 20000000 c03ee20c
00000000
9f40: 00052c00 00000020 c0398000 00000020 c0399f9c c0399f60 c026cff0
c026b7dc
9f60: c0399f88 c0399f70 c0379bb8 c02499c0 00000326 c03a28d4 00000000
c021a7e0
9f80: c03a2994 c03a28d4 c021a860 c03ee20c c0399fd8 c0399fa0 c0213ab0
c026cd04
9fa0: 00000000 00000000 000000c0 00000000 c020717d c03d7de0 c039d244
c03f5220
9fc0: c0219520 6901b118 c02194f0 c0399ff4 c0399fdc c0208760 c02139a4
c02082e4
9fe0: c03d7e48 c020717d 00000000 c0399ff8 c0208094 c0208684 00000000
00000000
Backtrace:
[<c0257c90>] (get_page_from_freelist+0x0/0x400) from [<c02580f8>]
(__alloc_pages+0x68/0x2c0)
[<c0258090>] (__alloc_pages+0x0/0x2c0) from [<c026bc4c>]
(cache_alloc_refill+0x2e8/0x6cc)
[<c026b964>] (cache_alloc_refill+0x0/0x6cc) from [<c026b8bc>]
(kmem_cache_alloc+0xec/0x144)
[<c026b7d0>] (kmem_cache_alloc+0x0/0x144) from [<c026cff0>]
(kmem_cache_create+0x2f8/0x6b0)
[<c026ccf8>] (kmem_cache_create+0x0/0x6b0) from [<c0213ab0>]
(kmem_cache_init+0x118/0x320)
[<c0213998>] (kmem_cache_init+0x0/0x320) from [<c0208760>]
(start_kernel+0xe8/0x19c)
[<c0208678>] (start_kernel+0x0/0x19c) from [<c0208094>]
(__enable_mmu+0x0/0x2c)
r4 = C020717D
Code: e24dd01c e50b2034 e5922000 e50b002c (e5920158)
<0>Kernel panic - not syncing: Attempted to kill the idle task!
[<c021fd68>] (dump_stack+0x0/0x24) from [<c02306e8>] (panic+0x48/0x11c)
[<c02306a0>] (panic+0x0/0x11c) from [<c0232d64>] (do_exit+0x74/0xb78)
r3 = 00000000 r2 = 00000002 r1 = 00000001 r0 = C0377760
[<c0232cf0>] (do_exit+0x0/0xb78) from [<c02200c0>] (die+0x2ec/0x338)
[<c021fdd4>] (die+0x0/0x338) from [<c0220160>]
(register_undef_hook+0x0/0x6c)
[<c022010c>] (notify_die+0x0/0x54) from [<c0221d2c>]
(do_DataAbort+0x8c/0xa0)
r4 = 00030001
[<c0221ca0>] (do_DataAbort+0x0/0xa0) from [<c021b860>]
(__dabt_svc+0x40/0x60)
r8 = 00000000 r7 = C039C068 r6 = 000000D0 r5 = C0399E64
r4 = FFFFFFFF
[<c0257c90>] (get_page_from_freelist+0x0/0x400) from [<c02580f8>]
(__alloc_pages+0x68/0x2c0)
[<c0258090>] (__alloc_pages+0x0/0x2c0) from [<c026bc4c>]
(cache_alloc_refill+0x2e8/0x6cc)
[<c026b964>] (cache_alloc_refill+0x0/0x6cc) from [<c026b8bc>]
(kmem_cache_alloc+0xec/0x144)
[<c026b7d0>] (kmem_cache_alloc+0x0/0x144) from [<c026cff0>]
(kmem_cache_create+0x2f8/0x6b0)
[<c026ccf8>] (kmem_cache_create+0x0/0x6b0) from [<c0213ab0>]
(kmem_cache_init+0x118/0x320)
[<c0213998>] (kmem_cache_init+0x0/0x320) from [<c0208760>]
(start_kernel+0xe8/0x19c)
[<c0208678>] (start_kernel+0x0/0x19c) from [<c0208094>]
(__enable_mmu+0x0/0x2c)
r4 = C020717D
---------------------------
| preempt count: 00000002 ]
| 2-level deep critical section nesting:
----------------------------------------
.. [<c024b78c>] .... add_preempt_count+0x1c/0x20
.....[<c02086b0>] .. ( <= start_kernel+0x38/0x19c)
.. [<c024b78c>] .... add_preempt_count+0x1c/0x20
.....[<c02306b8>] .. ( <= panic+0x18/0x11c)
--
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: [email protected] WWW: www.keba.com
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