linux-kernel - Re: ioremap panic

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Date:	Wed, 20 Aug 2008 10:09:50 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: ioremap panic

On Tue, Aug 19, 2008 at 11:51 PM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Sat, 16 Aug 2008 20:49:29 -0700 "Yinghai Lu" <yhlu.kernel@...il.com> wrote:
>
>> qla2xxx 0000:83:00.1: PCI INT B -> Link[LE3C] -> GSI 42 (level, low) -> IRQ 42
>> ------------[ cut here ]------------
>> kernel BUG at lib/ioremap.c:26!
>
> static int ioremap_pte_range(pmd_t *pmd, unsigned long addr,
>                unsigned long end, unsigned long phys_addr, pgprot_t prot)
> {
>        pte_t *pte;
>        unsigned long pfn;
>
>        pfn = phys_addr >> PAGE_SHIFT;
>        pte = pte_alloc_kernel(pmd, addr);
>        if (!pte)
>                return -ENOMEM;
>        do {
> -->             BUG_ON(!pte_none(*pte));
>
>> invalid opcode: 0000 [1] SMP
>> Dumping ftrace buffer:
>>    (ftrace buffer empty)
>> CPU 4
>> Modules linked in:
>> Pid: 1, comm: swapper Not tainted 2.6.27-rc3-tip-00452-g60e3132-dirty #58
>> RIP: 0010:[<ffffffff804b8aa2>]  [<ffffffff804b8aa2>]
>> ioremap_page_range+0x1b2/0x228
>> RSP: 0018:ffff881824c97a50  EFLAGS: 00010206
>> RAX: 00003e00beed2000 RBX: ffffc2001f126000 RCX: 00000000000ddff8
>> RDX: ffff8810224de930 RSI: ffffc2001f127000 RDI: ffffc2001f126000
>> RBP: ffff881824c97ac0 R08: ffff880844223890 R09: ffffffff80ea99a0
>> R10: 0000000080000000 R11: 000000000000000a R12: ffffc2001f127000
>> R13: ffffc2001f127000 R14: ffffffff80201c20 R15: ffff881827c017c0
>> FS:  0000000000000000(0000) GS:ffff881024c83400(0000) knlGS:0000000000000000
>> CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
>> CR2: 0000000000000000 CR3: 0000000000201000 CR4: 00000000000006e0
>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
>> Process swapper (pid: 1, threadinfo ffff881824c96000, task ffff881024ca0000)
>> Stack:  ffff881824c97aa0 ffffc2001f126fff ffffc2001f126fff ffffc2001f126fff
>>  ffffc2001f127000 ffffc2001f127000 ffff881027c01000 8000000000000173
>>  00003e00beed2000 8000000000000173 0000000000000010 ffffc2001f126000
>> Call Trace:
>>  [<ffffffff8024211e>] __ioremap_caller+0x246/0x2cd
>>  [<ffffffff8093ac5d>] ? qla2x00_probe_one+0x436/0xf96
>>  [<ffffffff8024228e>] ioremap_nocache+0x17/0x19
>>  [<ffffffff8093ac5d>] qla2x00_probe_one+0x436/0xf96
>>  [<ffffffff804c0626>] ? __bitmap_weight+0x3e/0x89
>>  [<ffffffff802566f1>] ? set_cpus_allowed_ptr+0x113/0x120
>>  [<ffffffff804b8dcc>] ? kobject_get+0x1a/0x22
>>  [<ffffffff804ca903>] pci_device_probe+0xd1/0x131
>>  [<ffffffff8053f7e8>] driver_probe_device+0xc5/0x173
>>  [<ffffffff8053f8ea>] __driver_attach+0x54/0x7e
>>  [<ffffffff8053f896>] ? __driver_attach+0x0/0x7e
>>  [<ffffffff8053f03e>] bus_for_each_dev+0x54/0x8e
>>  [<ffffffff804b8dcc>] ? kobject_get+0x1a/0x22
>>  [<ffffffff8053f624>] driver_attach+0x21/0x23
>>  [<ffffffff8053e92c>] bus_add_driver+0xbc/0x206
>>  [<ffffffff8053fafc>] driver_register+0xad/0x12d
>>  [<ffffffff804cabd5>] __pci_register_driver+0x6b/0xa6
>>  [<ffffffff80efcb01>] ? qla2x00_module_init+0x0/0x12c
>>  [<ffffffff80efcbfd>] qla2x00_module_init+0xfc/0x12c
>>  [<ffffffff8020904c>] _stext+0x4c/0x144
>>  [<ffffffff802695e7>] ? start_workqueue_thread+0x2b/0x2f
>>  [<ffffffff80269a09>] ? __create_workqueue_key+0x112/0x22c
>>  [<ffffffff80ed378f>] kernel_init+0x228/0x29d
>>  [<ffffffff80227ff9>] child_rip+0xa/0x11
>>  [<ffffffff80ed3567>] ? kernel_init+0x0/0x29d
>>  [<ffffffff80227fef>] ? child_rip+0x0/0x11
>> Code: 00 00 00 00 88 ff ff 48 01 c2 48 89 d8 48 c1 e8 09 25 f8 0f 00
>> 00 48 01 c2 48 8b 45 d0 48 8d 0c 03 48 c1 e9 0c 48 83 3a 00 74 04 <0f>
>> 0b eb fe 48 89 c8 48 81 c3 00 10 00 00 48 c1 e0 0c 48 0b 45
>> RIP  [<ffffffff804b8aa2>] ioremap_page_range+0x1b2/0x228
>>  RSP <ffff881824c97a50>
>
> Please work out what address qla2x00_probe_one() passed into ioremap(),
> then see if you can work out what was already at that virtual address
> (/proc/iomem, dmesg output, etc).
>

did not happen again after that day's tip/master

YH
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