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SubjectRe: pktcdvd -> sysfs warning with 2.6.27
Greg KH <> writes:

> On Sun, Oct 12, 2008 at 01:26:25PM +0100, Nix wrote:
>> At the very end of my startup scripts, I say
>> pktsetup cdrw /dev/cdrw
>> to get the stuff in /etc/pktcdvd set up right.
>> As of 2.6.27 this has started complaining:
>> pktcdvd: writer pktcdvd0 mapped to hde
>> ------------[ cut here ]------------
>> WARNING: at fs/sysfs/dir.c:463 sysfs_add_one+0x2f/0x3b()
>> sysfs: duplicate filename '254:0' can not be created
>> Modules linked in:
>> Pid: 1306, comm: pktsetup Not tainted 2.6.27-dirty #1
>> [<c011ac1c>] warn_slowpath+0x50/0x71
>> [<c0245c17>] ? ida_get_new_above+0xdc/0x17d
>> [<c0245a8a>] ? idr_get_empty_slot+0x142/0x1f3
>> [<c0245c17>] ? ida_get_new_above+0xdc/0x17d
>> [<c01a1738>] ? sysfs_ilookup_test+0x0/0x16
>> [<c01a1919>] ? sysfs_find_dirent+0x1b/0x2c
>> [<c01a1aba>] sysfs_add_one+0x2f/0x3b
>> [<c01a26f6>] sysfs_do_create_link+0xb1/0x106
>> [<c01a276b>] sysfs_create_link+0xf/0x14
>> [<c02749d2>] device_add+0x134/0x455
>> [<c0274d0a>] device_register+0x17/0x1a
>> [<c0274d8d>] device_create_vargs+0x80/0xa3
>> [<c0274dd0>] device_create+0x20/0x24
>> [<c028208f>] pkt_setup_dev+0x2ed/0x429
>> [<c0282251>] pkt_ctl_ioctl+0x86/0x18c
>> [<c0170c09>] vfs_ioctl+0x55/0x6e
>> [<c0185801>] ? block_truncate_page+0xa9/0x1e0
>> [<c0170e58>] do_vfs_ioctl+0x236/0x249
>> [<c0170e9c>] sys_ioctl+0x31/0x4d
>> [<c0102c8d>] sysenter_do_call+0x12/0x25
>> [<c0185801>] ? block_truncate_page+0xa9/0x1e0
>> =======================
>> ---[ end trace 1cdd10ab78ee5bc6 ]---
>> For the life of me I can't see where pkt_sysfs_dev_new() is being called
>> more than once: indeed, from the trace above GCC has inlined it into
>> pkt_setup_dev() as a static function called from only one place...
> Perhaps some other kernel code is registering with that same major/minor
> number, making it already present in sysfs. Where does that sysfs file
> link to before you load your driver?

I've just got a similar message from 2.6.27 but involving vcs1. I
didn't get this with and I've booted 2.6.27 a few times and
only seen it once:

WARNING: at fs/sysfs/dir.c:463 sysfs_add_one+0x33/0x3a()
sysfs: duplicate filename 'vcs1' can not be created
Modules linked in: xt_tcpudp nfs nfsd lockd nfs_acl auth_rpcgss sunrpc exportfs
ppdev lp ac battery xt_state ipt_MASQUERADE ipv6 ipt_LOG iptable_mangle iptable_
filter iptable_nat ip_tables nf_nat x_tables nf_conntrack_ipv4 nf_conntrack tun
dm_crypt crypto_blkcipher coretemp it87 hwmon_vid loop snd_hda_intel snd_pcm_oss
snd_mixer_oss snd_pcm snd_timer sg iTCO_wdt snd serio_raw i2c_i801 sr_mod i2c_c
ore parport_pc soundcore psmouse intel_agp parport button pcspkr snd_page_alloc
cdrom evdev ext3 jbd mbcache dm_mirror dm_log dm_snapshot dm_mod usbhid hid sd_m
od ata_piix libata r8169 ehci_hcd uhci_hcd thermal processor fan thermal_sys
Pid: 3841, comm: getty Not tainted 2.6.27 #1

Call Trace:
[<ffffffff802347d0>] warn_slowpath+0xb4/0xdc
[<ffffffff802284dc>] source_load+0x2a/0x58
[<ffffffff802f85c9>] __next_cpu+0x19/0x26
[<ffffffff802fd7de>] string+0x34/0x93
[<ffffffff802fdb59>] vsnprintf+0x31c/0x5be
[<ffffffff802f8c33>] idr_get_empty_slot+0x164/0x243
[<ffffffff802f8e08>] ida_get_new_above+0xf6/0x182
[<ffffffff80292ead>] find_inode+0x28/0x6d
[<ffffffff802c4a10>] sysfs_ilookup_test+0x0/0xf
[<ffffffff802c4c45>] sysfs_find_dirent+0x1b/0x2f
[<ffffffff802c4d22>] sysfs_add_one+0x33/0x3a
[<ffffffff802c521e>] create_dir+0x4f/0x7c
[<ffffffff802c5280>] sysfs_create_dir+0x35/0x4a
[<ffffffff802f983e>] kobject_get+0x12/0x17
[<ffffffff802f9977>] kobject_add_internal+0xcf/0x18a
[<ffffffff802f9f53>] kobject_add+0x74/0x7c
[<ffffffffa009e9bc>] journal_stop+0x176/0x182 [jbd]
[<ffffffffa00b1adf>] ext3_ordered_write_end+0xfc/0x112 [ext3]
[<ffffffff802f983e>] kobject_get+0x12/0x17
[<ffffffff80364174>] get_device+0x17/0x1f
[<ffffffff8036479e>] device_add+0x9e/0x5cc
[<ffffffff802f9637>] kobject_init_internal+0x12/0x2c
[<ffffffff802f96af>] kobject_init+0x41/0x69
[<ffffffff80364d76>] device_create_vargs+0x98/0xc4
[<ffffffff80364ddc>] device_create+0x3a/0x42
[<ffffffff802295c6>] __wake_up+0x38/0x4f
[<ffffffff8034d38d>] tty_ldisc_setup+0x63/0x6a
[<ffffffff80347a29>] init_dev+0x390/0x4a9
[<ffffffff8035542b>] vc_allocate+0x10/0x13f
[<ffffffff8034fc55>] vcs_make_sysfs+0x2d/0x5b
[<ffffffff803555ed>] con_open+0x93/0xa0
[<ffffffff803498fb>] tty_open+0x1ae/0x32d
[<ffffffff80284aee>] chrdev_open+0x131/0x15b
[<ffffffff802849bd>] chrdev_open+0x0/0x15b
[<ffffffff80280c06>] __dentry_open+0x13c/0x246
[<ffffffff8028bda7>] do_filp_open+0x38a/0x6d3
[<ffffffff8022947f>] need_resched+0x1e/0x28
[<ffffffff80294a27>] alloc_fd+0xb5/0xf9
[<ffffffff80280a06>] do_sys_open+0x48/0xcc
[<ffffffff8020bfab>] system_call_fastpath+0x16/0x1b

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  Last update: 2008-10-13 12:41    [W:0.078 / U:0.448 seconds]
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