Description of problem: inserted a USB pen drive. used it. detached it. oops. Version-Release number of selected component (if applicable): kernel-2.6.9-1.715_FC3 i686 PC is a Dell Precision 340. P4 1.7GHz 512MB i850. USB pen drive is a low cost one: PEAK 256MB USB2.0 I'll attach /proc/pci, /proc/cpuinfo and dmesg
Created attachment 109181 [details] /proc/pci
Created attachment 109182 [details] dmesg
Created attachment 109183 [details] cat /proc/cpuinfo
after this oops the usb subsystem seems to be gone: rossetti 3208 0.0 0.1 3344 584 pts/5 D+ 15:22 0:00 lsusb rossetti 3767 0.0 0.0 5200 404 pts/6 D+ 15:29 0:00 cat /proc/bus/usb/devices
can you try the latest from http://people.redhat.com/davej/kernels/Fedora/FC3/ There's a scsi refcount bugfix that should have fixed this issue.
Created attachment 109258 [details] Oopss with newer kernel
sorry, the attachment is from the pen connection, so only a kobject_register() WARN, not a Oops as reported in the comment. Now if I disconnect the pen I get the Oopps: Unable to handle kernel NULL pointer dereference at virtual address 00000064 printing eip: c01a342e *pde = 1a7de067 Oops: 0000 [#1] Modules linked in: usb_storage nfs nfsd exportfs lockd md5 ipv6 parport_pc lp parport autofs4 sunrpc dm_mod button bat tery ac joydev uhci_hcd snd_intel8x0 snd_ac97_codec snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd_page_alloc gamepor t snd_mpu401_uart snd_rawmidi snd_seq_device snd soundcore 3c59x floppy ext3 jbd aic7xxx sd_mod scsi_mod CPU: 0 EIP: 0060:[<c01a342e>] Not tainted VLI EFLAGS: 00010246 (2.6.9-1.724_FC3) EIP is at sysfs_remove_dir+0x1e/0x101 eax: cc8ed290 ebx: cc8ed290 ecx: c6fe5000 edx: 00000050 esi: d3b977c0 edi: 00000000 ebp: df7019e0 esp: dfcf7e64 ds: 007b es: 007b ss: 0068 Process khubd (pid: 23, threadinfo=dfcf7000 task=dfcfd220) Stack: 00000050 cc8ed290 d3b977c0 00000001 df7019e0 c01d2e1a cc8ed290 c01d2e2a d1c8f600 c01a0569 d9629db4 d9629db4 e0869d75 d9629db4 e086c004 c02385af e083ae20 e083ae6c c023878b d9629db4 c03606a8 d1c8f404 c0237a9b d9629db4 Call Trace: [<c01d2e1a>] kobject_del+0x16/0x1e [<c01d2e2a>] kobject_unregister+0x8/0x10 [<c01a0569>] del_gendisk+0x1e/0xa9 [<e0869d75>] sd_remove+0xf/0x5f [sd_mod] [<c02385af>] device_release_driver+0x3c/0x46 [<c023878b>] bus_remove_device+0x5c/0x95 [<c0237a9b>] device_del+0x6d/0x8e [<e0827231>] scsi_remove_device+0x67/0xb0 [scsi_mod] [<e08266c9>] scsi_forget_host+0xc6/0x19c [scsi_mod] [<e081f817>] scsi_remove_host+0x8/0x5c [scsi_mod] [<e0a7fd7f>] storage_disconnect+0x62/0x71 [usb_storage] [<c0271189>] usb_unbind_interface+0x2c/0x50 [<c02385af>] device_release_driver+0x3c/0x46 [<c023878b>] bus_remove_device+0x5c/0x95 [<c0237a9b>] device_del+0x6d/0x8e [<c0277df6>] usb_disable_device+0x5d/0xc5 [<c02732a5>] usb_disconnect+0xc2/0x206 [<c0273d74>] hub_port_connect_change+0x5b/0x4a7 [<c02744f1>] hub_events+0x331/0x3e2 [<c02745a2>] hub_thread+0x0/0xe4 [<c02745c0>] hub_thread+0x1e/0xe4 [<c011cc48>] autoremove_wake_function+0x0/0x2d [<c02745a2>] hub_thread+0x0/0xe4 [<c011cc48>] autoremove_wake_function+0x0/0x2d [<c01041d9>] kernel_thread_helper+0x5/0xb Code: f8 5f 5d e9 49 57 fd ff e9 34 ff ff ff 55 57 56 53 52 8b 78 30 85 ff 74 10 8b 07 85 c0 75 08 0f 0b 1a 01 93 7c 3 0 c0 ff 07 85 ff <8b> 6f 64 0f 84 d4 00 00 00 8b 77 20 31 c9 ba 6b 00 00 00 b8 cc
the errno returned by kobject_register is: #define EEXIST 17 /* File exists */ so there is something strange in the kobj string. I'm rebuild this very kernel with removed #undef DEBUG in kobject.c. of course the fact that add_partition() doesn't check kobject_register for errors does not help :) p->kobj.parent = &disk->kobj; p->kobj.ktype = &ktype_part; kobject_register(&p->kobj); disk->part[part-1] = p;
An update has been released for Fedora Core 3 (kernel-2.6.12-1.1372_FC3) which may contain a fix for your problem. Please update to this new kernel, and report whether or not it fixes your problem. If you have updated to Fedora Core 4 since this bug was opened, and the problem still occurs with the latest updates for that release, please change the version field of this bug to 'fc4'. Thank you.
The problem has been solved. thanks a lot.