linux-kernel - [ata crash] Re: Linux 2.6.25-rc1

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Date:	Tue, 12 Feb 2008 09:18:16 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	linux-kernel@...r.kernel.org
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mark Lord <mlord@...ox.com>, Jeff Garzik <jeff@...zik.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Tejun Heo <htejun@...il.com>
Subject: [ata crash] Re: Linux 2.6.25-rc1


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
[    8.232799]  [<c04a2063>] __ata_port_freeze+0x2c/0x33
[    8.232799]  [<c04a224f>] ata_eh_freeze_port+0x21/0x2f
[    8.232799]  [<c0497fa9>] ata_host_start+0xe1/0x132

the window of where the bug was introduced is not clear [i dont 
frequently randconfig test this box] - maybe randconfig just managed to 
stumble onto some really ancient bug.

if nobody can think of anything obvious i will try to bisect it down. 

( but that will take some time - this box is a slow booter and the 
  failure mode is not stable, for example panic_timeout was not followed 
  in the last msg so i cannot run automated crash-bisection scripts on 
  it either. I'll try to turn that WARN_ON() into a BUG_ON())

	Ingo

View attachment "config" of type "text/plain" (46636 bytes)

View attachment "crash.log" of type "text/plain" (156117 bytes)