From: Andrew Morton <akpm@osdl.org>
To: John Levin <levin@gamebox.net>
Cc: linux-kernel@vger.kernel.org, pavel@ucw.cz
Subject: Re: 2.6.2-rc3 messages BUG
Date: Fri, 20 Feb 2004 17:46:16 -0800 [thread overview]
Message-ID: <20040220174616.30d73718.akpm@osdl.org> (raw)
In-Reply-To: <20040221075308.161992c7.levin@gamebox.net>
John Levin <levin@gamebox.net> wrote:
>
> Hi,
> My guess atleast in this case is that suspend/resume cyle looses track
> of the fact that a module is use.I have file corruption. All those
> files which have been created after resume is corrupted. I copied dmesg
> into a backup file and saved it. When i boot 2.4 and look into it , it
> is corrputed.
> After booting I connect to the internet through wvdial. So i have to
> load up usbcore,cdc_acm,uhci. i am connected to the net and searching on
> google. Now i do echo 4 > /proc/acpi/sleep . It suspends. Then i resume
> it from command line.
> So now wvdial looks as if connected but really isn't. So i close it and
> try running it again. It doesn't detect /dev/usb/acm/0. So i remove the
> modules and try inserting it (uhci) which gives me the error.
>
> Here is something which i could copy after resume.
>
> --> WvDial: Internet dialer version 1.53
> --> Initializing modem.
> --> Sending: ATZ
> --> Sending: ATQ0
> --> Re-Sending: ATZ
> --> Modem not responding.
> lsmod
> [root@mdk9 root]# lsmod
> Module Size Used by
> uhci_hcd 31752 0
> cdc_acm 10784 3
> usbcore 111828 4 uhci_hcd,cdc_acm
> [root@mdk9 root]# rmmod uhci_hcd
> [root@mdk9 root]# insmod
> /lib/modules/2.6.3-rc2/kernel/drivers/usb/host/uhci-hcd.ko
You missed out an important piece of info. The kernel should have printed
out "kmem_cache_create: duplicate cache <name>" before going BUG.
What was "<name>"? uhci_urb_priv?
I suggest you go into drivers/usb/host/uhci-hcd.c:uhci_hcd_cleanup() and
replace
warn("not all urb_priv's were freed!");
with
BUG();
because failure to destroy that slab cache is fatal, and it points at a bug
in this driver.
> ------------[cut here ]------------
> kernel BUG at mm/slab.c:1269!
> invalid operand: 0000 [#1]
> CPU: 0
> EIP: 0060:[<c0143a29>] Not tainted
> EFLAGS: 00010202
> EIP is at kmem_cache_create+0x509/0x670
> eax: 00000031 ebx: c130277c ecx: c04a50e8 edx: c03cc3f8
> esi: cf935fa7 edi: cf935fa7 ebp: cbdedf74 esp: cbdedf44
> ds: 007b es: 007b ss: 0068
> Process insmod (pid: 2234, threadinfo=cbdec000 task=cc1fa6a0)
> Stack: c036e980 cf935f99 00010c00 cbdedf64 c13026a4 c0000000 c1302668
> fffffffc 00000020 00000000 fffffff4 cf938980 cbdedf9c cf91d0d4
> cf935f99 00000044 00000080 00010c00 00000000 00000000 c03ceb70
> c03ceb58 cbdedfbc c0137aeb Call Trace:
> [<cf91d0d4>] uhci_hcd_init+0xd4/0x12e [uhci_hcd]
> [<c0137aeb>] sys_init_module+0xeb/0x1c0
> [<c010b1df>] syscall_call+0x7/0xb
next prev parent reply other threads:[~2004-02-21 1:44 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-21 2:23 John Levin
2004-02-20 21:01 ` Pavel Machek
2004-02-21 1:46 ` Andrew Morton [this message]
2004-02-21 1:58 ` Chris Wright
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