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Date: Wed, 27 Jun 2007 16:15:19 -0400
From: Chuck Ebbert <cebbert@redhat.com>
Organization: Red Hat
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To: Jan Engelhardt <jengelh@computergmbh.de>
CC: corentincj@iksaif.net, sziwan@users.sourceforge.net,
       acpi4asus-user@lists.sourceforge.net,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Oops on rmmod asus_acpi
References: <Pine.LNX.4.64.0706272113120.11120@fbirervta.pbzchgretzou.qr>
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On 06/27/2007 03:16 PM, Jan Engelhardt wrote:

> Jun 27 21:11:33 su1 kernel: WARNING: at /ws/linux-2.6.22/lib/kref.c:33 kref_get()
> Jun 27 21:11:33 su1 kernel:  [<c01c5e75>] kref_get+0x34/0x3f
> Jun 27 21:11:33 su1 kernel:  [<c01c52ef>] kobject_get+0xf/0x13
> Jun 27 21:11:33 su1 kernel:  [<c0228885>] get_driver+0xe/0x14
> Jun 27 21:11:33 su1 kernel:  [<c0228896>] driver_remove_file+0xb/0x25
> Jun 27 21:11:33 su1 kernel:  [<c0227efd>] bus_remove_driver+0x17/0x75
> Jun 27 21:11:33 su1 kernel:  [<c6a9f018>] asus_acpi_exit+0x18/0x28 [asus_acpi]
> Jun 27 21:11:33 su1 kernel:  [<c013cebc>] sys_delete_module+0x1a0/0x1c8
> Jun 27 21:11:33 su1 kernel:  [<c01494bd>] audit_syscall_entry+0x10d/0x137
> Jun 27 21:11:33 su1 kernel:  [<c0107c18>] do_syscall_trace+0x13d/0x181
> Jun 27 21:11:33 su1 kernel:  [<c0104d40>] syscall_call+0x7/0xb

kref with zero reference count -- nice.

> Jun 27 21:11:33 su1 kernel: BUG: unable to handle kernel NULL pointer dereference at virtual address 00000010
> Jun 27 21:11:33 su1 kernel:  printing eip:
> Jun 27 21:11:33 su1 kernel: c02ab74b
> Jun 27 21:11:33 su1 kernel: *pde = 00000000
> Jun 27 21:11:33 su1 kernel: Oops: 0000 [#1]
> Jun 27 21:11:33 su1 kernel: SMP 
> Jun 27 21:11:33 su1 kernel: Modules linked in: asus_acpi ipv6 nfs lockd nfs_acl sunrpc dock button battery ac dm_crypt loop dm_mod xt_hashlimit ip6_tables xt_u32 xt_conntrack xt_connlimit nf_conntrack nfnetlink x_tables rtc_cmos rtc_core rtc_lib pcnet32 mii i2c_piix4 i2c_core mptctl generic piix ide_core shpchp pci_hotplug intel_agp agpgart sg parport_pc lp parport sd_mod edd xfs fan mptspi mptscsih mptbase scsi_transport_spi ata_piix libata scsi_mod thermal processor
> Jun 27 21:11:33 su1 kernel: CPU:    0
> Jun 27 21:11:33 su1 kernel: EIP:    0060:[<c02ab74b>]    Not tainted VLI
> Jun 27 21:11:33 su1 kernel: EFLAGS: 00010246   (2.6.22-rc6+ccj #11)
> Jun 27 21:11:33 su1 kernel: EIP is at klist_del+0x9/0x31
> Jun 27 21:11:33 su1 kernel: eax: 00000000   ebx: 00000000   ecx: c02fdc20   edx: 00000001
> Jun 27 21:11:33 su1 kernel: esi: 00000000   edi: c6aa262c   ebp: c139c000   esp: c139df30
> Jun 27 21:11:33 su1 kernel: ds: 007b   es: 007b   fs: 00d8  gs: 0033  ss: 0068
> Jun 27 21:11:33 su1 kernel: Process rmmod (pid: 3004, ti=c139c000 task=c5da0030 task.ti=c139c000)
> Jun 27 21:11:33 su1 kernel: Stack: c6aa262c 00000000 c0341100 c02ab7c3 c6aa25d0 c0227f36 c6aa2d80 00000000 
> Jun 27 21:11:33 su1 kernel:        00000880 c6a9f018 c013cebc 73757361 7063615f c2cf0069 00000000 c01494bd 
> Jun 27 21:11:33 su1 kernel:        bfb59010 00000081 40000003 c5da0030 bfb5b858 00000880 00000000 c139dfb8 
> Jun 27 21:11:33 su1 kernel: Call Trace:
> Jun 27 21:11:33 su1 kernel:  [<c02ab7c3>] klist_remove+0x8/0x13
> Jun 27 21:11:33 su1 kernel:  [<c0227f36>] bus_remove_driver+0x50/0x75
> Jun 27 21:11:33 su1 kernel:  [<c6a9f018>] asus_acpi_exit+0x18/0x28 [asus_acpi]
> Jun 27 21:11:33 su1 kernel:  [<c013cebc>] sys_delete_module+0x1a0/0x1c8
> Jun 27 21:11:33 su1 kernel:  [<c01494bd>] audit_syscall_entry+0x10d/0x137
> Jun 27 21:11:33 su1 kernel:  [<c0107c18>] do_syscall_trace+0x13d/0x181
> Jun 27 21:11:33 su1 kernel:  [<c0104d40>] syscall_call+0x7/0xb
> Jun 27 21:11:33 su1 kernel:  =======================
> Jun 27 21:11:33 su1 kernel: Code: ff 8b 04 24 8b 16 89 46 08 b0 01 86 02 85 ed 74 08 85 ff 74 04 89 f8 ff d5 8b 04 24 5a 5b 5e 5f 5d c3 57 89 c7 56 53 8b 18 89 d8 <8b> 73 10 e8 d3 22 00 00 89 f8 e8 6f ff ff ff 83 f8 01 19 c0 f7 
> Jun 27 21:11:33 su1 kernel: EIP: [<c02ab74b>] klist_del+0x9/0x31 SS:ESP 0068:c139df30

The device's klist_node is not on any list (n->n_klist == NULL)
in klist_del:

void klist_del(struct klist_node * n)
{
        struct klist * k = n->n_klist;
===>    void (*put)(struct klist_node *) = k->put;

So the driver gets totally screwed up if it loads, finds no compatible
hardware and then you try to unload it.
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