linux-kernel - Re: [BUG] rfcomm

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Date:	Wed, 20 Feb 2008 18:36:11 +0800
From:	Dave Young <hidave.darkstar@...il.com>
To:	Alon Bar-Lev <alon.barlev@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, marcel@...tmann.org,
	bluez-devel@...ts.sourceforge.net
Subject: Re: [BUG] rfcomm

On Sat, Feb 16, 2008 at 11:49:58PM +0200, Alon Bar-Lev wrote:
> On Saturday 16 February 2008, Dave Young wrote:
> > Hi, alon
> > 
> > Please try the attached patch, hope it fixes your problem.
> > 
> > Regards
> > dave
> 
> Does not work... :(
> 
> Alon.
> 
> Feb 16 23:41:33 alon1 usb 3-1: configuration #1 chosen from 1 choice
> Feb 16 23:41:33 alon1 BUG: unable to handle kernel NULL pointer dereference at virtual address 00000008
> Feb 16 23:41:33 alon1 printing eip: c01b2db6 *pde = 00000000 
> Feb 16 23:41:33 alon1 Oops: 0000 [#1] PREEMPT 
> Feb 16 23:41:33 alon1 Modules linked in: ppp_deflate zlib_deflate zlib_inflate bsd_comp ppp_async rfcomm l2cap hci_usb vmnet(P) vmmon(P) tun radeon drm autofs4 ipv6 aes_generic crypto_algapi ieee80211_crypt_ccmp nf_nat_irc nf_nat_ftp nf_conntrack_irc nf_conntrack_ftp ipt_MASQUERADE iptable_nat nf_nat ipt_REJECT xt_tcpudp ipt_LOG xt_limit xt_state nf_conntrack_ipv4 nf_conntrack iptable_filter ip_tables x_tables snd_pcm_oss snd_mixer_oss snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device bluetooth ppp_generic slhc ioatdma dca cfq_iosched cpufreq_powersave cpufreq_ondemand cpufreq_conservative acpi_cpufreq freq_table uinput fan af_packet nls_cp1255 nls_iso8859_1 nls_utf8 nls_base pcmcia snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm nsc_ircc snd_timer ipw2200 thinkpad_acpi irda snd ehci_hcd yenta_socket uhci_hcd psmouse ieee80211 soundcore intel_agp hwmon rsrc_nonstatic pcspkr e1000 crc_ccitt snd_page_alloc i2c_i801 ieee80211_crypt pcmcia_core agpgart thermal battery nvram rtc sr_mod ac sg firmware_class button processor cdrom unix usbcore evdev ext3 jbd ext2 mbcache loop ata_piix libata sd_mod scsi_mod
> Feb 16 23:41:33 alon1 
> Feb 16 23:41:33 alon1 Pid: 4, comm: events/0 Tainted: P        (2.6.24-gentoo-r2 #1)
> Feb 16 23:41:33 alon1 EIP: 0060:[<c01b2db6>] EFLAGS: 00010282 CPU: 0
> Feb 16 23:41:33 alon1 EIP is at sysfs_get_dentry+0x26/0x80
> Feb 16 23:41:33 alon1 EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: f48a2210
> Feb 16 23:41:33 alon1 ESI: f72eb900 EDI: f4803ae0 EBP: f4803ae0 ESP: f7c49efc
> Feb 16 23:41:33 alon1 hcid[7004]: HCI dev 0 registered
> Feb 16 23:41:33 alon1 DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
> Feb 16 23:41:33 alon1 Process events/0 (pid: 4, ti=f7c48000 task=f7c3efc0 task.ti=f7c48000)
> Feb 16 23:41:33 alon1 Stack: f7cb6140 f4822668 f7e71e10 c01b304d ffffffff ffffffff fffffffe c030ba9c 
> Feb 16 23:41:33 alon1 f7cb6140 f4822668 f6da6720 f7cb6140 f4822668 f6da6720 c030ba8e c01ce20b 
> Feb 16 23:41:33 alon1 f6e9dd00 c030ba8e f6da6720 f6e9dd00 f6e9dd00 00000000 f4822600 00000000 
> Feb 16 23:41:33 alon1 Call Trace:
> Feb 16 23:41:33 alon1 [<c01b304d>] sysfs_move_dir+0x3d/0x1f0
> Feb 16 23:41:33 alon1 [<c01ce20b>] kobject_move+0x9b/0x120
> Feb 16 23:41:33 alon1 [<c0241711>] device_move+0x51/0x110
> Feb 16 23:41:33 alon1 [<f9aaed80>] del_conn+0x0/0x70 [bluetooth]
> Feb 16 23:41:33 alon1 [<f9aaed99>] del_conn+0x19/0x70 [bluetooth]
> Feb 16 23:41:33 alon1 [<c012c1a1>] run_workqueue+0x81/0x140
> Feb 16 23:41:33 alon1 [<c02c0c88>] schedule+0x168/0x2e0
> Feb 16 23:41:33 alon1 [<c012fc70>] autoremove_wake_function+0x0/0x50
> Feb 16 23:41:33 alon1 [<c012c9cb>] worker_thread+0x9b/0xf0
> Feb 16 23:41:33 alon1 [<c012fc70>] autoremove_wake_function+0x0/0x50
> Feb 16 23:41:33 alon1 [<c012c930>] worker_thread+0x0/0xf0
> Feb 16 23:41:33 alon1 [<c012f962>] kthread+0x42/0x70
> Feb 16 23:41:33 alon1 [<c012f920>] kthread+0x0/0x70
> Feb 16 23:41:33 alon1 [<c0104c2f>] kernel_thread_helper+0x7/0x18
> Feb 16 23:41:33 alon1 =======================
> Feb 16 23:41:33 alon1 Code: 26 00 00 00 00 57 89 c7 a1 50 1b 3a c0 56 53 8b 70 38 85 f6 74 08 8b 0e 85 c9 74 58 ff 06 8b 56 50 39 fa 74 47 89 fb eb 02 89 c3 <8b> 43 08 39 c2 75 f7 8b 46 08 83 c0 68 e8 98 e7 10 00 8b 43 10 
> Feb 16 23:41:33 alon1 EIP: [<c01b2db6>] sysfs_get_dentry+0x26/0x80 SS:ESP 0068:f7c49efc
> Feb 16 23:41:33 alon1 ---[ end trace aae864e9592acc1d ]---
> Feb 16 23:41:33 alon1 hcid[7004]: HCI dev 0 up
> Feb 16 23:41:33 alon1 hcid[7004]: Device hci0 has been added
> Feb 16 23:41:33 alon1 hcid[7004]: Starting security manager 0

Could you try patch below?


Defer hci_unregister_sysfs because hci device could be destructed
while hci conn devices still there.

Signed-off-by: Dave Young <hidave.darkstar@...il.com>

---
net/bluetooth/hci_core.c |    4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff -upr linux/net/bluetooth/hci_core.c linux.new/net/bluetooth/hci_core.c
--- linux/net/bluetooth/hci_core.c	2008-02-20 18:27:28.000000000 +0800
+++ linux.new/net/bluetooth/hci_core.c	2008-02-20 18:28:34.000000000 +0800
@@ -901,8 +901,6 @@ int hci_unregister_dev(struct hci_dev *h
 
 	BT_DBG("%p name %s type %d", hdev, hdev->name, hdev->type);
 
-	hci_unregister_sysfs(hdev);
-
 	write_lock_bh(&hci_dev_list_lock);
 	list_del(&hdev->list);
 	write_unlock_bh(&hci_dev_list_lock);
@@ -914,6 +912,8 @@ int hci_unregister_dev(struct hci_dev *h
 
 	hci_notify(hdev, HCI_DEV_UNREG);
 
+	hci_unregister_sysfs(hdev);
+
 	__hci_dev_put(hdev);
 
 	return 0;
--
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