Re: 2.6.0-test8: panic on boot

From: Olivier NICOLAS
Date: Sat Oct 18 2003 - 14:53:39 EST

Thanks


It works for 2.6.0-test8 with ACPI debug


ACPI: Subsystem revision 20031002
tbxface-0117 [03] acpi_load_tables : ACPI Tables successfully acquired
Parsing all Control Methods:..................................................................................
Table [DSDT](id F004) - 614 Objects with 75 Devices 173 Methods 25 Regions
ACPI Namespace successfully loaded at root c03fe6bc
evxfevnt-0093 [04] acpi_enable : Transition to ACPI mode successful
evgpeblk-0748 [06] ev_create_gpe_block : GPE 00 to 15 [_GPE] 2 regs at 000000000000500C on int 9
evgpeblk-0221 [08] ev_save_method_info : Unknown GPE method type: C16A (name not of form _Lnn or _Enn)
evgpeblk-0221 [08] ev_save_method_info : Unknown GPE method type: C135 (name not of form _Lnn or _Enn)
Completing Region/Field/Buffer/Package initialization:........................................................
Initialized 25/25 Regions 0/0 Fields 19/19 Buffers 33/33 Packages (622 nodes)
Executing all Device _STA and_INI methods:....................................................................
76 Devices found containing: 76 _STA, 6 _INI methods
ACPI: Interpreter enabled
ACPI: Using PIC for interrupt routing
dsopcode-0526 [19] ds_init_buffer_field : Field [C00C] size 1184 exceeds Buffer [<NUL] size 1088 (bits)
psparse-1120: *** Error: Method execution failed [\_SB_.C005.C00B] (Node c7f8a748), AE_AML_BUFFER_LIMIT
psparse-1120: *** Error: Method execution failed [\_SB_.C005.C00F] (Node c7f8a688), AE_AML_BUFFER_LIMIT
psparse-1120: *** Error: Method execution failed [\_SB_.C005._CRS] (Node c7f8a5c8), AE_AML_BUFFER_LIMIT
uteval-0098: *** Error: Method execution failed [\_SB_.C005._CRS] (Node c7f8a5c8), AE_AML_BUFFER_LIMIT
ACPI: PCI Root Bridge [C005] (00:00)
PCI: Probing PCI hardware (bus 00)
ACPI: PCI Interrupt Routing Table [\_SB_.C005._PRT]
ACPI: Power Resource [C129] (on)
ACPI: Power Resource [C0DB] (on)
ACPI: PCI Interrupt Link [C142] (IRQs *11)
ACPI: PCI Interrupt Link [C148] (IRQs 11)
ACPI: PCI Interrupt Link [C149] (IRQs *11)
ACPI: PCI Interrupt Link [C14A] (IRQs *11)
ACPI: Power Resource [C15F] (off)
ACPI: Power Resource [C161] (off)
ACPI: Power Resource [C163] (off)
Linux Kernel Card Services
options: [pci] [cardbus] [pm]
ACPI: PCI Interrupt Link [C142] enabled at IRQ 11
ACPI: PCI Interrupt Link [C14A] enabled at IRQ 11
ACPI: PCI Interrupt Link [C149] enabled at IRQ 11
PCI: Using ACPI for IRQ routing
PCI: if you experience problems, try using option 'pci=noacpi' or even 'acpi=off'

...
Andrew Morton wrote:
Olivier NICOLAS <olivn@xxxxxxxxxxxxx> wrote:

NULL pointer dereference at virtual address 00000004
printing eip:
c01de05e
*pde = 00000000
Oops: 0000 [#1]
CPU: 0
EIP: 0060:[<c01de05e>] Not tainted
EFLAGS: 00010213
EIP is at vsnprintf+0x28e/0x4e0
eax: 00000004 ebx: 0000000a ecx: 00000004 edx: 00000003
esi: c03efae7 edi: ffffffff ebp: 00000000 esp: c114bac0
ds: 007b es: 007b ss: 0068
Process swapper (pid: 1, threadinfo=c114a000 task=c117b8c0)
Stack: c114bb08 ffffffff 000004a0 00000000 0000000a ffffffff 00000003 00000002
00000004 00000004 ffffffff 00000001 c114bb68 c7f02c48 c7f02ee8 c01de307
c03efac0 3fc10540 c03292ea c114bb60 c01e6579 c03efac0 c03292c0 c114bb54
Call Trace:
[<c01de307>] vsprintf+0x27/0x30
[<c01e6579>] acpi_os_vprintf+0x12/0x2a
[<c020992b>] acpi_ut_debug_print+0x97/0x9d
[<c01e91d2>] acpi_ds_init_buffer_field+0x18d/0x20c
[<c01e93ac>] acpi_ds_eval_buffer_field_operands+0x15b/0x17d
[<c01e9f8f>] acpi_ds_exec_end_op+0x22c/0x409


Well clearly one of the strings in this debug message in
acpi_ds_init_buffer_field() is null:

/* Entire field must fit within the current length of the buffer */

if ((bit_offset + bit_count) >
(8 * (u32) buffer_desc->buffer.length)) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Field [%4.4s] size %d exceeds Buffer [%4.4s] size %d (bits)\n",



It is perhaps desirable to make printk() a bit more robust about this sort
of thing.


diff -puN lib/vsprintf.c~printk-handle-bad-pointers lib/vsprintf.c
--- 25/lib/vsprintf.c~printk-handle-bad-pointers 2003-10-18 11:19:05.000000000 -0700
+++ 25-akpm/lib/vsprintf.c 2003-10-18 11:19:25.000000000 -0700
@@ -348,7 +348,7 @@ int vsnprintf(char *buf, size_t size, co
case 's':
s = va_arg(args, char *);
- if (!s)
+ if ((unsigned long)s < PAGE_SIZE)
s = "<NULL>";
len = strnlen(s, precision);

_




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