On Fri, 31 Oct 2008, Helge Deller wrote:
> I noticed various slab errors with complete kernel crashes with my USB
> keyboard/mouse on a 32bit parisc machine with both 2.6.28-rc1 and -rc2.
> Kernel 2.6.27 was still OK.
[ ... ]
On Fri, 31 Oct 2008, Jeroen Roovers wrote:
> I am seeing the same USB problem but without the SLAB errors - [1] is
> the Gentoo bug report. The kernel boots fine with both USB keyboard and
> mouse detached.
[ ... ]
> [17179609.972000] IASQ: 00000000 00000000 IAOQ: 102f6a50 102f6a54
> [17179609.972000] IIR: 0f40101c ISR: 00000000 IOR: 00000000
> [17179609.972000] CPU: 0 CR30: 8f86c000 CR31: 11111111
> [17179609.972000] ORIG_R28: 0000000f
> [17179609.972000] IAOQ[0]: strcmp+0x0/0x34
> [17179609.972000] IAOQ[1]: strcmp+0x4/0x34
> [17179609.972000] RP(r2): sysfs_find_dirent+0x34/0x50
> [17179609.972000] Backtrace:
> [17179609.972000] [<101daa9c>] sysfs_find_dirent+0x34/0x50
> [17179609.972000] [<101daad8>] __sysfs_add_one+0x20/0xc0
> [17179609.972000] [<101dab8c>] sysfs_add_one+0x14/0x50
> [17179609.972000] [<101db250>] create_dir+0x64/0xcc
> [17179609.972000] [<101db2e4>] sysfs_create_dir+0x2c/0x5c
> [17179609.972000] [<102f2cd0>] kobject_add_internal+0xb8/0x1b0
> [17179609.972000] [<102f326c>] kobject_add+0x38/0x68
> [17179609.972000] [<1035b2b0>] device_add+0xdc/0x55c
> [17179609.972000] [<103d6930>] mousedev_create+0x17c/0x1f8
> [17179609.972000] [<103d7284>] mousedev_connect+0x48/0x138
> [17179609.972000] [<103d2b50>] input_attach_handler+0x6c/0xac
> [17179609.972000] [<103d5014>] input_register_device+0x1a4/0x250
> [17179609.972000] [<103dfe08>] hidinput_connect+0x308/0x3b40
> [17179609.972000] [<103de5d4>] hid_connect+0x22c/0x2c0
> [17179609.972000] [<103de740>] hid_device_probe+0xd8/0xfc
> [17179609.972000] [<1035db94>] driver_probe_device+0xa4/0x198
What architecture is this, please?
If I understand the dump correctly, it bugs because strcmp() in
sysfs_find_dirent() got somehow NULL pointer.
I am not able to reproduce this locally and I can't see what is going
wrong here. Could you please try the patch below and send the dmesg
output? (beware, it will produce quite some output volume). This might
help us understand a little bit better what string goes NULL where, or
what exactly is happening.
Thanks.
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 82d3b79..e14fb5f 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -418,6 +418,9 @@ void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt,
*/
int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
{
+ printk(KERN_DEBUG "__sysfs_add_one\n");
+ printk(KERN_DEBUG "%s\n", acxt->parent_sd->s_name);
+ printk(KERN_DEBUG "%s\n", sd->s_name);
if (sysfs_find_dirent(acxt->parent_sd, sd->s_name))
return -EEXIST;
--
Jiri Kosina
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