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Date: Fri, 26 Oct 2007 12:05:51 -0500
From: Larry Finger <Larry.Finger@...inger.net>
To: Greg Kroah-Hartman <gregkh@...e.de>,
Kay Sievers <kay.sievers@...y.org>
CC: LKML <linux-kernel@...r.kernel.org>
Subject: Re: linux-2.6.23-git3: Many sysfs-related warnings in dmesg
On my openSUSE 10.3 x86_64 system running v2.6.24-rc1-281-g22d2aa1, I get the sysfs rename messages.
Using Greg's patch, nothing changed. The log results are:
sysfs: duplicate filename 'eth1' can not be created
WARNING: at fs/sysfs/dir.c:424 sysfs_add_one()
Call Trace:
[<ffffffff802d1180>] sysfs_add_one+0x5c/0xc9
[<ffffffff802d20e1>] sysfs_create_link+0xd3/0x12e
[<ffffffff80363855>] device_rename+0x17a/0x1db
[<ffffffff80393a5d>] dev_change_name+0x101/0x1fe
[<ffffffff80393d5e>] dev_ifsioc+0x204/0x2bf
[<ffffffff80394352>] dev_ioctl+0x539/0x644
[<ffffffff80252e12>] __lock_acquire+0xd26/0xd47
[<ffffffff8028fab9>] fd_install+0x30/0x68
[<ffffffff80386ca2>] sock_ioctl+0x204/0x212
[<ffffffff8029d666>] do_ioctl+0x2a/0x77
[<ffffffff8029d904>] vfs_ioctl+0x251/0x26e
[<ffffffff803eff8b>] trace_hardirqs_on_thunk+0x35/0x3a
[<ffffffff8029d963>] sys_ioctl+0x42/0x67
[<ffffffff8020c15e>] system_call+0x7e/0x83
net eth1: device_rename: sysfs_create_symlink failed (-17)
udev: renamed network interface wlan0 to eth1
===========================================================
Kay's patch shows the following BUG, as well as the rename message:
BUG: sleeping function called from invalid context at kernel/mutex.c:207
in_atomic():1, irqs_disabled():0
2 locks held by udevd/1965:
#0: (rtnl_mutex){--..}, at: [<ffffffff8039c6f4>] rtnl_lock+0x12/0x14
#1: (&dev_base_lock){-.--}, at: [<ffffffff80393a1b>] dev_change_name+0xff/0x1f0
Call Trace:
[<ffffffff80250854>] debug_show_held_locks+0x22/0x24
[<ffffffff8022d10c>] __might_sleep+0x10a/0x10c
[<ffffffff803ef006>] mutex_lock_nested+0x28/0x2e1
[<ffffffff802f387d>] kobject_rename+0x6b/0xea
[<ffffffff802d19b9>] sysfs_rename_dir+0x2d/0x178
[<ffffffff802f387d>] kobject_rename+0x6b/0xea
[<ffffffff802f38b0>] kobject_rename+0x9e/0xea
[<ffffffff80363760>] device_rename+0xc5/0x1db
[<ffffffff80393a26>] dev_change_name+0x10a/0x1f0
[<ffffffff80393d10>] dev_ifsioc+0x204/0x2bf
[<ffffffff80394304>] dev_ioctl+0x539/0x644
[<ffffffff80252e12>] __lock_acquire+0xd26/0xd47
[<ffffffff8028fab9>] fd_install+0x30/0x68
[<ffffffff80386c62>] sock_ioctl+0x204/0x212
[<ffffffff8029d666>] do_ioctl+0x2a/0x77
[<ffffffff8029d904>] vfs_ioctl+0x251/0x26e
[<ffffffff803eff3b>] trace_hardirqs_on_thunk+0x35/0x3a
[<ffffffff8029d963>] sys_ioctl+0x42/0x67
[<ffffffff8020c15e>] system_call+0x7e/0x83
WARNING: at kernel/mutex.c:135 __mutex_lock_common()
Call Trace:
[<ffffffff8022d10c>] __might_sleep+0x10a/0x10c
[<ffffffff803ef062>] mutex_lock_nested+0x84/0x2e1
[<ffffffff802f387d>] kobject_rename+0x6b/0xea
[<ffffffff802d19b9>] sysfs_rename_dir+0x2d/0x178
[<ffffffff802f387d>] kobject_rename+0x6b/0xea
[<ffffffff802f38b0>] kobject_rename+0x9e/0xea
[<ffffffff80363760>] device_rename+0xc5/0x1db
[<ffffffff80393a26>] dev_change_name+0x10a/0x1f0
[<ffffffff80393d10>] dev_ifsioc+0x204/0x2bf
[<ffffffff80394304>] dev_ioctl+0x539/0x644
[<ffffffff80252e12>] __lock_acquire+0xd26/0xd47
[<ffffffff8028fab9>] fd_install+0x30/0x68
[<ffffffff80386c62>] sock_ioctl+0x204/0x212
[<ffffffff8029d666>] do_ioctl+0x2a/0x77
[<ffffffff8029d904>] vfs_ioctl+0x251/0x26e
[<ffffffff803eff3b>] trace_hardirqs_on_thunk+0x35/0x3a
[<ffffffff8029d963>] sys_ioctl+0x42/0x67
[<ffffffff8020c15e>] system_call+0x7e/0x83
sysfs: duplicate filename 'eth1' can not be created
WARNING: at fs/sysfs/dir.c:424 sysfs_add_one()
Call Trace:
[<ffffffff802d1180>] sysfs_add_one+0x5c/0xc9
[<ffffffff802d20e1>] sysfs_create_link+0xd3/0x12e
[<ffffffff80363815>] device_rename+0x17a/0x1db
[<ffffffff80393a26>] dev_change_name+0x10a/0x1f0
[<ffffffff80393d10>] dev_ifsioc+0x204/0x2bf
[<ffffffff80394304>] dev_ioctl+0x539/0x644
[<ffffffff80252e12>] __lock_acquire+0xd26/0xd47
[<ffffffff8028fab9>] fd_install+0x30/0x68
[<ffffffff80386c62>] sock_ioctl+0x204/0x212
[<ffffffff8029d666>] do_ioctl+0x2a/0x77
[<ffffffff8029d904>] vfs_ioctl+0x251/0x26e
[<ffffffff803eff3b>] trace_hardirqs_on_thunk+0x35/0x3a
[<ffffffff8029d963>] sys_ioctl+0x42/0x67
[<ffffffff8020c15e>] system_call+0x7e/0x83
net eth1: device_rename: sysfs_create_symlink failed (-17)
=============================================================
The following patch logs the problem with a minimum of log output.
Index: linux-2.6/fs/sysfs/dir.c
===================================================================
--- linux-2.6.orig/fs/sysfs/dir.c
+++ linux-2.6/fs/sysfs/dir.c
@@ -418,12 +418,8 @@ void sysfs_addrm_start(struct sysfs_addr
*/
int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
{
- if (sysfs_find_dirent(acxt->parent_sd, sd->s_name)) {
- printk(KERN_WARNING "sysfs: duplicate filename '%s' "
- "can not be created\n", sd->s_name);
- WARN_ON(1);
+ if (sysfs_find_dirent(acxt->parent_sd, sd->s_name))
return -EEXIST;
- }
sd->s_parent = sysfs_get(acxt->parent_sd);
Larry
-
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