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Date: Mon, 12 May 2008 10:05:00 +0800 From: "Dave Young" <hidave.darkstar@...il.com> To: "Pavel Machek" <pavel@...e.cz> Cc: "kernel list" <linux-kernel@...r.kernel.org>, gregkh@...e.de, marcel@...tmann.org, linux-bluetooth@...r.kernel.org Subject: Re: 2.6.26-rc1: warnings from sysfs, bluetooth related On Mon, May 12, 2008 at 12:19 AM, Pavel Machek <pavel@...e.cz> wrote: > > Hi! > > I'm getting these from rfcomm... Are you sure it's a regression? Dont know if it's same bug as BUG 10341. I just describe the problem in bug 10341: While a rfcomm device is opened more than once, the BUG 10341 can be triggered. rfcomm dev reference will be held for every rfcomm_tty_open, but release_dev will hangup the tty and release the dev number for free use without judge the dev->opened. rfcomm_dev_state_change and rfcomm_tty_hangup could del the rfcomm dev as well, the problem is similar as above. If the create_dev called before the last tty_close, sysfs will warning and create will fail. I have a patch which don't hold the dev reference in rfcomm_tty_open, but it need some review and test. please see: http://bugzilla.kernel.org/attachment.cgi?id=15746 Marcel, do you have idea about this? or other solution? > > Pavel > > host4: resumed > scsi 4:0:0:0: Direct-Access OLYMPUS C765UZ 1.00 PQ: 0 ANSI: 2 > sd 4:0:0:0: [sdb] 32000 512-byte hardware sectors (16 MB) > sd 4:0:0:0: [sdb] Write Protect is off > sd 4:0:0:0: [sdb] Mode Sense: 18 00 00 08 > sd 4:0:0:0: [sdb] Assuming drive cache: write through > sd 4:0:0:0: [sdb] 32000 512-byte hardware sectors (16 MB) > sd 4:0:0:0: [sdb] Write Protect is off > sd 4:0:0:0: [sdb] Mode Sense: 18 00 00 08 > sd 4:0:0:0: [sdb] Assuming drive cache: write through > sdb: sdb1 > sd 4:0:0:0: [sdb] Attached SCSI removable disk > sd 4:0:0:0: Attached scsi generic sg1 type 0 > usb-storage: device scan complete > hci_cmd_task: hci0 command tx timeout > usb 5-1: USB disconnect, address 2 > btusb_bulk_complete: hci0 urb f6191550 failed to resubmit (19) > btusb_bulk_complete: hci0 urb f6879090 failed to resubmit (19) > btusb_send_frame: hci0 urb f6879090 submission failed > hub 1-0:1.0: unable to enumerate USB device on port 7 > usb 5-1: new full speed USB device using uhci_hcd and address 4 > usb 5-1: configuration #1 chosen from 1 choice > usb 5-1: New USB device found, idVendor=0a5c, idProduct=2110 > usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 > usb 5-1: Product: BCM2045B > usb 5-1: Manufacturer: Broadcom Corp > sysfs: duplicate filename 'rfcomm0' can not be created > ------------[ cut here ]------------ > WARNING: at /data/l/linux/fs/sysfs/dir.c:425 sysfs_add_one+0x85/0xa0() > Modules linked in: > Pid: 2011, comm: rfcomm Tainted: G W 2.6.26-rc1 #289 > [<c022a2af>] warn_on_slowpath+0x5f/0x90 > [<c021c9e8>] __wake_up_common+0x48/0x70 > [<c02203e8>] __wake_up+0x38/0x50 > [<c022aa8b>] wake_up_klogd+0x3b/0x40 > [<c038510b>] ida_get_new_above+0x7b/0x180 > [<c02bd400>] sysfs_ilookup_test+0x0/0x10 > [<c0751214>] _spin_unlock+0x14/0x20 > [<c029037f>] ifind+0x8f/0xa0 > [<c022b23b>] printk+0x1b/0x20 > [<c02bd775>] sysfs_add_one+0x85/0xa0 > [<c02bdcc8>] create_dir+0x48/0x90 > [<c02bdd39>] sysfs_create_dir+0x29/0x50 > [<c0751214>] _spin_unlock+0x14/0x20 > [<c0385d66>] kobject_add_internal+0xb6/0x190 > [<c0385eb9>] kobject_set_name_vargs+0x29/0x50 > [<c0386201>] kobject_add+0x31/0x60 > [<c0385c2f>] kobject_get+0xf/0x20 > [<c04235ef>] device_add+0x9f/0x500 > [<c042326e>] device_initialize+0xce/0xf0 > [<c0423aeb>] device_create+0x8b/0xc0 > [<c03e6219>] tty_register_device+0x69/0xf0 > [<c038a2a4>] vsnprintf+0x544/0x600 > [<c038e982>] __spin_lock_init+0x32/0x60 > [<c07512d9>] _spin_lock+0x29/0x40 > [<c06e20ea>] rfcomm_dev_ioctl+0x53a/0x690 > [<c06e01be>] rfcomm_sock_ioctl+0x1e/0x50 > [<c06e01c9>] rfcomm_sock_ioctl+0x29/0x50 > [<c0625e16>] sock_ioctl+0xb6/0x1d0 > [<c0625d60>] sock_ioctl+0x0/0x1d0 > [<c0288e8b>] vfs_ioctl+0x2b/0x90 > [<c0288f4c>] do_vfs_ioctl+0x5c/0x2a0 > [<c02891cd>] sys_ioctl+0x3d/0x70 > [<c0203c2a>] syscall_call+0x7/0xb > ======================= > ---[ end trace a0614c8bfea95988 ]--- > kobject_add_internal failed for rfcomm0 with -EEXIST, don't try to register things with the same name in the same directory. > Pid: 2011, comm: rfcomm Tainted: G W 2.6.26-rc1 #289 > [<c0385de7>] kobject_add_internal+0x137/0x190 > [<c0386201>] kobject_add+0x31/0x60 > [<c0385c2f>] kobject_get+0xf/0x20 > [<c04235ef>] device_add+0x9f/0x500 > [<c042326e>] device_initialize+0xce/0xf0 > [<c0423aeb>] device_create+0x8b/0xc0 > [<c03e6219>] tty_register_device+0x69/0xf0 > [<c038a2a4>] vsnprintf+0x544/0x600 > [<c038e982>] __spin_lock_init+0x32/0x60 > [<c07512d9>] _spin_lock+0x29/0x40 > [<c06e20ea>] rfcomm_dev_ioctl+0x53a/0x690 > [<c06e01be>] rfcomm_sock_ioctl+0x1e/0x50 > [<c06e01c9>] rfcomm_sock_ioctl+0x29/0x50 > [<c0625e16>] sock_ioctl+0xb6/0x1d0 > [<c0625d60>] sock_ioctl+0x0/0x1d0 > [<c0288e8b>] vfs_ioctl+0x2b/0x90 > [<c0288f4c>] do_vfs_ioctl+0x5c/0x2a0 > [<c02891cd>] sys_ioctl+0x3d/0x70 > [<c0203c2a>] syscall_call+0x7/0xb > ======================= > sysfs: duplicate filename 'rfcomm0' can not be created > ------------[ cut here ]------------ > WARNING: at /data/l/linux/fs/sysfs/dir.c:425 sysfs_add_one+0x85/0xa0() > Modules linked in: > Pid: 2104, comm: rfcomm Tainted: G W 2.6.26-rc1 #289 > [<c022a2af>] warn_on_slowpath+0x5f/0x90 > [<c021c9e8>] __wake_up_common+0x48/0x70 > [<c02203e8>] __wake_up+0x38/0x50 > [<c022aa8b>] wake_up_klogd+0x3b/0x40 > [<c038510b>] ida_get_new_above+0x7b/0x180 > [<c02bd400>] sysfs_ilookup_test+0x0/0x10 > [<c0751214>] _spin_unlock+0x14/0x20 > [<c029037f>] ifind+0x8f/0xa0 > [<c022b23b>] printk+0x1b/0x20 > [<c02bd775>] sysfs_add_one+0x85/0xa0 > [<c02bdcc8>] create_dir+0x48/0x90 > [<c02bdd39>] sysfs_create_dir+0x29/0x50 > [<c0751214>] _spin_unlock+0x14/0x20 > [<c0385d66>] kobject_add_internal+0xb6/0x190 > [<c0385eb9>] kobject_set_name_vargs+0x29/0x50 > [<c0386201>] kobject_add+0x31/0x60 > [<c0385c2f>] kobject_get+0xf/0x20 > [<c04235ef>] device_add+0x9f/0x500 > [<c042326e>] device_initialize+0xce/0xf0 > [<c0423aeb>] device_create+0x8b/0xc0 > [<c03e6219>] tty_register_device+0x69/0xf0 > [<c038a2a4>] vsnprintf+0x544/0x600 > [<c038e982>] __spin_lock_init+0x32/0x60 > [<c07512d9>] _spin_lock+0x29/0x40 > [<c06e20ea>] rfcomm_dev_ioctl+0x53a/0x690 > [<c06e01be>] rfcomm_sock_ioctl+0x1e/0x50 > [<c06e01c9>] rfcomm_sock_ioctl+0x29/0x50 > [<c0625e16>] sock_ioctl+0xb6/0x1d0 > [<c0625d60>] sock_ioctl+0x0/0x1d0 > [<c0288e8b>] vfs_ioctl+0x2b/0x90 > [<c0288f4c>] do_vfs_ioctl+0x5c/0x2a0 > [<c02891cd>] sys_ioctl+0x3d/0x70 > [<c0203c2a>] syscall_call+0x7/0xb > ======================= > ---[ end trace a0614c8bfea95988 ]--- > kobject_add_internal failed for rfcomm0 with -EEXIST, don't try to register things with the same name in the same directory. > Pid: 2104, comm: rfcomm Tainted: G W 2.6.26-rc1 #289 > [<c0385de7>] kobject_add_internal+0x137/0x190 > [<c0386201>] kobject_add+0x31/0x60 > [<c0385c2f>] kobject_get+0xf/0x20 > [<c04235ef>] device_add+0x9f/0x500 > [<c042326e>] device_initialize+0xce/0xf0 > [<c0423aeb>] device_create+0x8b/0xc0 > [<c03e6219>] tty_register_device+0x69/0xf0 > [<c038a2a4>] vsnprintf+0x544/0x600 > [<c038e982>] __spin_lock_init+0x32/0x60 > [<c07512d9>] _spin_lock+0x29/0x40 > [<c06e20ea>] rfcomm_dev_ioctl+0x53a/0x690 > [<c06e01be>] rfcomm_sock_ioctl+0x1e/0x50 > [<c06e01c9>] rfcomm_sock_ioctl+0x29/0x50 > [<c0625e16>] sock_ioctl+0xb6/0x1d0 > [<c0625d60>] sock_ioctl+0x0/0x1d0 > [<c0288e8b>] vfs_ioctl+0x2b/0x90 > [<c0288f4c>] do_vfs_ioctl+0x5c/0x2a0 > [<c02891cd>] sys_ioctl+0x3d/0x70 > [<c0203c2a>] syscall_call+0x7/0xb > ======================= > > -- > (english) http://www.livejournal.com/~pavelmachek > (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html > -- > To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To 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