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Date: Tue, 12 Feb 2008 07:14:52 -0800
From: Arjan van de Ven <arjan@infradead.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel@vger.kernel.org,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Mark Lord <mlord@pobox.com>, Jeff Garzik <jeff@garzik.org>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>, Tejun Heo <htejun@gmail.com>
Subject: Re: [ata crash] Re: Linux 2.6.25-rc1
Message-ID: <20080212071452.5c58ae6d@laptopd505.fenrus.org>
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On Tue, 12 Feb 2008 09:18:16 +0100
Ingo Molnar <mingo@elte.hu> wrote:

> 
> hm, ata_port_wait_eh() started crashing on a testsystem (8-way box):
> 
> [   39.324116] Calling initcall 0xc09f41eb: legacy_init+0x0/0x888()
> [   39.331868] BUG: unable to handle kernel NULL pointer dereference
> at 000000e4 [   39.338811] IP: [<c04a4e11>] ata_port_wait_eh+0x77/0xa2
> [   39.344115] *pde = 00000000
> [   39.347778] Oops: 0000 [#1] SMP
> [   39.350769]
> [   39.350769] Pid: 1, comm: swapper Not tainted (2.6.25-rc1 #5)
> [   39.350769] EIP: 0060:[<c04a4e11>] EFLAGS: 00010246 CPU: 1
> [   39.350769] EIP is at ata_port_wait_eh+0x77/0xa2
> [   39.350769] EAX: f72e5d9c EBX: f7340000 ECX: c035eb18 EDX: 00000000
> [   39.350769] ESI: f73424f0 EDI: 00000246 EBP: f7c63efc ESP: f7c63edc
> [   39.350769]  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
> [   39.350769] Process swapper (pid: 1, ti=f7c62000 task=f7c60000
> task.ti=f7c62) [   39.350769] Stack: 00000000 f7c60000 c012fd31
> f7c63ee8 f7c63ee8 f7340000 f73 [   39.350769]        f7c63f18
> c049c4b1 f72e5d9c 00000000 f7340000 00810001 000
> [   39.350769]        c09f4a60 00000000 00000000 c0b79a9c 00000001
> 00000001 000 [   39.350769] Call Trace: [   39.350769]
> [<c012fd31>] ? autoremove_wake_function+0x0/0x30 [   39.350769]
> [<c049c4b1>] ? ata_host_detach+0x4c/0x13b [   39.350769]
> [<c09f4a60>] ? legacy_init+0x875/0x888 [   39.350769]  [<c0133fa6>] ?
> getnstimeofday+0x35/0xc0 [   39.350769]  [<c09d7465>] ?
> kernel_init+0x12a/0x277 [   39.350769]  [<c09d7300>] ?
> do_early_param+0x34/0x6f [   39.350769]  [<c09d733b>] ?
> kernel_init+0x0/0x277 [   39.350769]  [<c0104b17>] ?
> kernel_thread_helper+0x7/0x10 [   39.350769]  =======================
> [   39.350769] Code: e8 82 0f 21 00 8b 43 08 e8 28 2c 21 00 89 c7 f6
> 43 10 03 8 [   39.350769] EIP: [<c04a4e11>]
> ata_port_wait_eh+0x77/0xa2 SS:ESP 0068:f7c63edc[   39.350793]
> ---[ end trace 07a6e399b623c9d0 ]--- [   39.354119] Kernel panic -
> not syncing: Attempted to kill init!
> 
> no particular commit stands out at me - so i Cc:-ed various PATA
> folks. Config attached [it's randconfig generated so might have weird
> option combinations in it]. [ Note: the box uses BLK_CPQ_DA as its
> primary storage, ATA is just a CDROM side-thing - so it was never
> heavily tested here. It never crashed the bootup before though. ]
> 
> On a second attempt to boot the same bzImage, another ATA related 
> weirdness showed up:
> 
> [    8.226144] Calling initcall 0xc09f3d8e: isapnp_init+0x0/0xf()
> [    8.232017] Bad IO access at port 0x0 (outb(val,port))
> [    8.232799] ------------[ cut here ]------------
> [    8.232799] WARNING: at lib/iomap.c:44 bad_io_access+0x2f/0x34()
> [    8.232799] Pid: 1, comm: swapper Not tainted 2.6.25-rc1 #5
> [    8.232799]  [<c011fd63>] warn_on_slowpath+0x3c/0x4c
> [    8.232799]  [<c0358e9d>] ? serial8250_console_write+0x0/0x14e
> [    8.232799]  [<c01200a5>] ? __call_console_drivers+0x56/0x63
> [    8.232799]  [<c06b7acf>] ? _spin_unlock_irqrestore+0x15/0x21
> [    8.232799]  [<c0120556>] ? release_console_sem+0x1c1/0x1c9
> [    8.232799]  [<c015c400>] ? print_trailer+0x6e/0xfc
> [    8.232799]  [<c015c77f>] ? check_object+0x10b/0x181
> [    8.232799]  [<c01209a0>] ? printk+0x15/0x17
> [    8.232799]  [<c02cc2ce>] bad_io_access+0x2f/0x34
> [    8.232799]  [<c02cc48a>] iowrite8+0x31/0x34
> [    8.232799]  [<c04a1c8d>] ata_bmdma_freeze+0x1d/0x30

btw this one was featured in the weekly bug top 10.. it's a rather popular thing to happen.


-- 
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