Message-Id: <200609131836.34714.rjw@sisk.pl>
Date:	Wed, 13 Sep 2006 18:36:34 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Andrew Morton <akpm@...l.org>
Cc:	linux-kernel@...r.kernel.org,
	Alan Stern <stern@...land.harvard.edu>,
	USB development list <linux-usb-devel@...ts.sourceforge.net>
Subject: Re: 2.6.18-rc6-mm2: rmmod ohci_hcd oopses on HPC 6325

On Wednesday, 13 September 2006 15:58, Rafael J. Wysocki wrote:
> On Tuesday, 12 September 2006 09:06, Andrew Morton wrote:
> > 
> > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.18-rc6/2.6.18-rc6-mm2/
> 
> 'rmmod ohci_hcd' causes the following oops to appear on my HPC 6325 every
> time (happens also on -rc6-mm1, does not happen on -rc7):

So far, I have verified that the problem already happened on -rc5-mm1.

Greetings,
Rafael


> Unable to handle kernel NULL pointer dereference at 0000000000000274 RIP:
>  [<ffffffff8822c185>] :ohci_hcd:ohci_hub_status_data+0x25/0x27b
> PGD 35ca9067 PUD 369a4067 PMD 0
> Oops: 0000 [1] SMP
> last sysfs file: /devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
> CPU 0
> Modules linked in: netconsole cpufreq_ondemand cpufreq_userspace cpufreq_powersa
> ve powernow_k8 freq_table button af_packet edd battery snd_pcm_oss snd_mixer_oss
>  snd_seq snd_seq_device ac ip6t_REJECT xt_tcpudp ipt_REJECT xt_state iptable_man
> gle iptable_nat ip_nat iptable_filter ip6table_mangle ip_conntrack nfnetlink ip_
> tables ip6table_filter ip6_tables x_tables ipv6 loop dm_mod usbhid ff_memless hc
> i_usb bluetooth snd_hda_intel snd_hda_codec bcm43xx ohci1394 ohci_hcd shpchp pci
> _hotplug pcmcia ehci_hcd i2c_piix4 ieee1394 firmware_class ieee80211softmac usbc
> ore tg3 sdhci ieee80211 ieee80211_crypt mmc_core ide_cd k8temp yenta_socket rsrc
> _nonstatic pcmcia_core i2c_core hwmon snd_pcm snd_timer snd soundcore snd_page_a
> lloc cdrom ext3 jbd fan thermal processor atiixp ide_disk ide_core sg
> Pid: 3667, comm: rmmod Tainted: G   M  2.6.18-rc6-mm2 #19
> RIP: 0010:[<ffffffff8822c185>]  [<ffffffff8822c185>] :ohci_hcd:ohci_hub_status_d
> ata+0x25/0x27b
> RSP: 0018:ffffffff805c7e18  EFLAGS: 00010296
> RAX: 0000000000000000 RBX: ffff81003485c508 RCX: 0000000000000000
> RDX: 0000000000000064 RSI: ffffffff805c7e68 RDI: ffff81003485c640
> RBP: ffffffff805c7e58 R08: 0000000000000000 R09: ffff810037438138
> R10: ffffffff80701c40 R11: ffff81003263bc88 R12: ffff81003485c640
> R13: ffffffff805c7e68 R14: ffffc2000003c000 R15: ffff81003485c508
> FS:  00002ba0d06fa6d0(0000) GS:ffffffff8066f000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: 0000000000000274 CR3: 000000002f153000 CR4: 00000000000006e0
> Process rmmod (pid: 3667, threadinfo ffff81003263a000, task ffff81003697c810)
> Stack:  ffffffff802813b0 ffffffff805c7e40 ffffffff80281258 ffff81003485c508
>  ffff81003485c508 ffff81003485c508 ffffc2000003c000 ffffffff805c7e68
>  ffffffff805c7ea8 ffffffff8818e03f 003d09e3f5998950 ffffffff80509860
> Call Trace:
>  [<ffffffff8818e03f>] :usbcore:usb_hcd_poll_rh_status+0x40/0x13b
>  [<ffffffff8822c01b>] :ohci_hcd:ohci_irq+0xcb/0x210
>  [<ffffffff8818e78b>] :usbcore:usb_hcd_irq+0x2f/0x5f
>  [<ffffffff8020ef13>] handle_IRQ_event+0x33/0x66
>  [<ffffffff802af5f8>] handle_fasteoi_irq+0x9d/0xe3
>  [<ffffffff80267c85>] do_IRQ+0x104/0x11f
>  [<ffffffff80259621>] ret_from_intr+0x0/0xa
> DWARF2 unwinder stuck at ret_from_intr+0x0/0xa
> 
> Leftover inexact backtrace:
> 
>  <IRQ>  <EOI>  [<ffffffff802ee4ac>] sysfs_hash_and_remove+0x9/0x137
>  [<ffffffff802eed13>] sysfs_remove_file+0x10/0x12
>  [<ffffffff8038baf7>] class_device_remove_file+0x12/0x14
>  [<ffffffff8822aa02>] :ohci_hcd:ohci_stop+0xf5/0x17b
>  [<ffffffff8818d9d2>] :usbcore:usb_remove_hcd+0xdc/0x114
>  [<ffffffff8040f8eb>] klist_release+0x0/0x82
>  [<ffffffff88197f45>] :usbcore:usb_hcd_pci_remove+0x1e/0x7d
>  [<ffffffff803204d8>] pci_device_remove+0x25/0x3c
>  [<ffffffff8038b1b5>] __device_release_driver+0x80/0x9c
>  [<ffffffff8038b617>] driver_detach+0xac/0xee
>  [<ffffffff8038ad92>] bus_remove_driver+0x75/0x98
>  [<ffffffff8038b696>] driver_unregister+0x15/0x21
>  [<ffffffff80320686>] pci_unregister_driver+0x13/0x8e
>  [<ffffffff8822cd1c>] :ohci_hcd:ohci_hcd_pci_cleanup+0x10/0x12
>  [<ffffffff8029b281>] sys_delete_module+0x1b5/0x1e6
>  [<ffffffff8025910e>] system_call+0x7e/0x83
> 
> 
> Code: 8a 98 74 02 00 00 e8 d6 3b 03 f8 48 89 45 d0 41 8b 84 24 e4
> RIP  [<ffffffff8822c185>] :ohci_hcd:ohci_hub_status_data+0x25/0x27b
>  RSP <ffffffff805c7e18>
> CR2: 0000000000000274
>  <0>Kernel panic - not syncing: Aiee, killing interrupt handler!
> 
> where
> 
> (gdb) l *ohci_hub_status_data+0x25
> 0x4185 is in ohci_hub_status_data (drivers/usb/host/ohci-hub.c:316).
> 311             struct ohci_hcd *ohci = hcd_to_ohci (hcd);
> 312             int             i, changed = 0, length = 1;
> 313             int             can_suspend;
> 314             unsigned long   flags;
> 315
> 316             can_suspend = device_may_wakeup(&hcd->self.root_hub->dev);
> 317             spin_lock_irqsave (&ohci->lock, flags);
> 318
> 319             /* handle autosuspended root:  finish resuming before
> 320              * letting khubd or root hub timer see state changes.
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