Return-Path: Date: Mon, 7 Jan 2008 15:13:00 +0100 From: Gabor Gombas To: Al Viro Message-ID: <20080107141300.GB12763@boogie.lpds.sztaki.hu> References: <20071228173203.GA20690@boogie.lpds.sztaki.hu> <20080102151642.GA7273@boogie.lpds.sztaki.hu> <20080105075039.GF27894@ZenIV.linux.org.uk> MIME-Version: 1.0 In-Reply-To: <20080105075039.GF27894@ZenIV.linux.org.uk> Cc: htejun@gmail.com, bluez-devel@lists.sf.net, linux-kernel@vger.kernel.org Subject: Re: [Bluez-devel] Oops involving RFCOMM and sysfs Reply-To: BlueZ development List-Id: BlueZ development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Sender: bluez-devel-bounces@lists.sourceforge.net Errors-To: bluez-devel-bounces@lists.sourceforge.net Hi, On Sat, Jan 05, 2008 at 07:50:39AM +0000, Al Viro wrote: > Could you stick > if (!parent->d_inode) > printk(KERN_WARNING "sysfs locking blows: %s", > parent->d_name.name); > right before > mutex_lock(&parent->d_inode->i_mutex); > dentry = lookup_one_noperm(cur->s_name, parent); > mutex_unlock(&parent->d_inode->i_mutex); > in sysfs_get_dentry() (fs/sysfs/dir.c) and verify that it does, indeed, > trigger? Here it is: Jan 7 14:35:43 twister kernel: sysfs locking blows: acl001BAFE1624D<1>Unable to handle kernel NULL pointer dereference at 00000000000000b8 RIP: Jan 7 14:35:43 twister kernel: [] mutex_lock+0x10/0x1d Jan 7 14:35:43 twister kernel: PGD b6031067 PUD b609c067 PMD 0 Jan 7 14:35:43 twister kernel: Oops: 0002 [1] Jan 7 14:35:43 twister kernel: CPU 0 Jan 7 14:35:43 twister kernel: Modules linked in: binfmt_misc rfcomm l2cap nfsd auth_rpcgss exportfs ipt_REJECT xt_tcpudp ipt_LOG xt_limit iptable_filter ip_tables x_tables nfs lockd nfs_acl sunrpc fuse dm_crypt saa7134_alsa radeon hwmon_vid eeprom hci_usb bluetooth usb_storage tuner tea5767 tda8290 tuner_simple mt20xx tea5761 parport_pc parport floppy snd_intel8x0 snd_ac97_codec saa7134 ac97_bus firewire_ohci firewire_core videobuf_dma_sg videobuf_core ir_kbd_i2c sky2 ir_common crc_itu_t snd_pcm forcedeth snd_timer snd_page_alloc ehci_hcd ohci_hcd sg sr_mod cdrom Jan 7 14:35:43 twister kernel: Pid: 3218, comm: cat Not tainted 2.6.24-rc6debug-dirty #5 Jan 7 14:35:43 twister kernel: RIP: 0010:[] [] mutex_lock+0x10/0x1d Jan 7 14:35:43 twister kernel: RSP: 0018:ffff8100b5733d08 EFLAGS: 00010246 Jan 7 14:35:43 twister kernel: RAX: 0000000000000000 RBX: 00000000000000b8 RCX: 0000000000000001 Jan 7 14:35:43 twister kernel: RDX: ffff8100b5733fd8 RSI: ffff8100bfab6000 RDI: 00000000000000b8 Jan 7 14:35:43 twister kernel: RBP: ffffffff80593db0 R08: ffffffff8057b118 R09: ffffffff806093d0 Jan 7 14:35:43 twister kernel: R10: ffff8100b6074aa0 R11: ffff81000101b100 R12: ffff8100b6074aa0 Jan 7 14:35:43 twister kernel: R13: 00000000fffffff4 R14: ffff8100b571fb80 R15: ffff8100b573e000 Jan 7 14:35:43 twister kernel: FS: 00002aead9fc56e0(0000) GS:ffffffff805ba000(0000) knlGS:0000000000000000 Jan 7 14:35:43 twister kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b Jan 7 14:35:43 twister kernel: CR2: 00000000000000b8 CR3: 00000000b60b2000 CR4: 00000000000006e0 Jan 7 14:35:43 twister kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Jan 7 14:35:43 twister kernel: DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Jan 7 14:35:43 twister kernel: Process cat (pid: 3218, threadinfo ffff8100b5732000, task ffff8100bfa70830) Jan 7 14:35:43 twister kernel: Stack: ffffe2000007e310 ffffffff8028560d ffff8100b202a7d0 ffffffff802af076 Jan 7 14:35:43 twister kernel: ffff8100bfa52f00 ffff8100b6074aa0 ffff8100b618c720 ffffffff802af28b Jan 7 14:35:43 twister kernel: ffff8100b61308d0 ffff8100b61308d0 ffff8100bfa1a800 ffff8100b618c720 Jan 7 14:35:43 twister kernel: Call Trace: Jan 7 14:35:43 twister kernel: [] dput+0x26/0x103 Jan 7 14:35:43 twister kernel: [] sysfs_get_dentry+0x5e/0xa8 Jan 7 14:35:43 twister kernel: [] sysfs_move_dir+0x63/0x204 Jan 7 14:35:43 twister kernel: [] kobject_move+0xba/0x110 Jan 7 14:35:43 twister kernel: [] device_move+0x59/0x111 Jan 7 14:35:43 twister kernel: [] :rfcomm:rfcomm_tty_close+0x2f/0x74 Jan 7 14:35:43 twister kernel: [] release_dev+0x212/0x5e2 Jan 7 14:35:43 twister kernel: [] do_page_fault+0x2ff/0x65a Jan 7 14:35:43 twister kernel: [] tty_release+0xc/0x10 Jan 7 14:35:43 twister kernel: [] __fput+0xb1/0x16f Jan 7 14:35:43 twister kernel: [] filp_close+0x5d/0x65 Jan 7 14:35:43 twister kernel: [] sys_close+0x73/0xa6 Jan 7 14:35:43 twister kernel: [] tracesys+0xdc/0xe1 Jan 7 14:35:43 twister kernel: Jan 7 14:35:43 twister kernel: Jan 7 14:35:43 twister kernel: Code: ff 0f 79 05 e8 c9 00 00 00 58 5a 5b c3 41 54 48 8d 47 08 48 Jan 7 14:35:43 twister kernel: RIP [] mutex_lock+0x10/0x1d Jan 7 14:35:43 twister kernel: RSP Jan 7 14:35:43 twister kernel: CR2: 00000000000000b8 Jan 7 14:35:43 twister kernel: ---[ end trace 0e3a1176e9294792 ]--- Gabor -- --------------------------------------------------------- MTA SZTAKI Computer and Automation Research Institute Hungarian Academy of Sciences --------------------------------------------------------- ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. 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