Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm2-V0.7.32-0

[Gene Heskett]

On Saturday 04 December 2004 17:32, Rui Nuno Capela wrote:
>Ingo Molnar wrote:
>> i have released the -V0.7.32-0 Real-Time Preemption patch, which
>> can be downloaded from the usual place:

I can confirm essentially this same bug, this rather voluminous output 
took place after I turned off my camera and unplugged the usb cable 
from it.  At that point all other usb stuff was spotty, even the 
mouse till I rebooted.

>I have a bug to report, it shows on both of my machines (SMP and UP)
> now running RT-V0.7.32-2. It seems to be present also on previous
> RT releases, and don't even know if it's upstream.
>
>When one usb-storage flash stick is first time unplugged:
>
>usb 4-6: USB disconnect, address 4
>slab error in kmem_cache_destroy(): cache `scsi_cmd_cache': Can't
> free all objects
> [<c010361f>] dump_stack+0x23/0x25 (20)
> [<c01467d7>] kmem_cache_destroy+0x103/0x1aa (28)
> [<c026e77a>] scsi_destroy_command_freelist+0x97/0xa8 (28)
> [<c026f5b1>] scsi_host_dev_release+0x37/0xe1 (104)
> [<c023c6a9>] device_release+0x7a/0x7c (32)
> [<c01efd90>] kobject_cleanup+0x87/0x89 (28)
> [<c01f07eb>] kref_put+0x52/0xef (40)
> [<c01efdcc>] kobject_put+0x25/0x27 (16)
> [<f8cf1843>] usb_stor_release_resources+0x66/0xca [usb_storage]
> (16) [<f8cf1d93>] storage_disconnect+0x8e/0x9b [usb_storage] (16)
> [<f89ca117>] usb_unbind_interface+0x84/0x86 [usbcore] (28)
> [<c023d915>] device_release_driver+0x75/0x77 (28)
> [<c023db18>] bus_remove_device+0x53/0x82 (20)
> [<c023cae1>] device_del+0x4b/0x9b (20)
> [<f89d142a>] usb_disable_device+0xf5/0x10a [usbcore] (28)
> [<f89cc61c>] usb_disconnect+0xc8/0x164 [usbcore] (40)
> [<f89cd77e>] hub_port_connect_change+0x2ef/0x426 [usbcore] (56)
> [<f89cda7b>] hub_events+0x1c6/0x39d [usbcore] (56)
> [<f89cdc89>] hub_thread+0x37/0x109 [usbcore] (96)
> [<c01009b1>] kernel_thread_helper+0x5/0xb (142893076)
>
>
>Then, just when the same is plugged in again:
>
>usb 4-6: new high speed USB device using ehci_hcd and address 5
>kmem_cache_create: duplicate cache scsi_cmd_cache
>BUG at mm/slab.c:1447!
>------------[ cut here ]------------
>kernel BUG at mm/slab.c:1447!
>invalid operand: 0000 [#1]
>PREEMPT SMP
>Modules linked in: nls_utf8 nls_cp860 vfat fat nls_base usb_storage
>ohci1394 ieee1394 ehci_hcd usbhid uhci_hcd intel_mch_agp agpgart
> evdev wacom snd_pcm_oss snd_mixer_oss snd_seq_midi
> snd_seq_midi_event snd_seq snd_usb_usx2y snd_usb_lib snd_hwdep
> snd_cs46xx snd_rawmidi snd_seq_device snd_intel8x0 snd_ac97_codec
> snd_pcm snd_timer snd soundcore snd_page_alloc realtime commoncap
> w83781d i2c_sensor i2c_isa i2c_i801 i2c_core sk98lin subfs dm_mod
> usbcore
>CPU:    1
>EIP:    0060:[<c01462e9>]    Not tainted VLI
>EFLAGS: 00010286   (2.6.10-rc2-mm3-RT-V0.7.32-2.0smp)
>EIP is at kmem_cache_create+0x4df/0x69c
>eax: 00000017   ebx: f7cd9710   ecx: c05c5d00   edx: f77b8000
>esi: c030973a   edi: c030973a   ebp: f77b9d10   esp: f77b9cd8
>ds: 007b   es: 007b   ss: 0068   preempt: 00000001
>Process khubd (pid: 1477, threadinfo=f77b8000 task=f777c2b0)
>Stack: c02f2054 c02f63aa 000005a7 00000565 f77b9d00 f7cd10c0
> c0000000 ffffff80
>       00000001 f7cd1080 00000080 c03418a0 f7000400 f7000428
> f77b9d3c c026e662
>       c030972b 00000180 00000080 00002000 00000000 00000000
> f7000490 00000000
>Call Trace:
> [<c01035f4>] show_stack+0xb4/0xbc (28)
> [<c010378a>] show_registers+0x169/0x1de (56)
> [<c010399c>] die+0x10b/0x191 (68)
> [<c0103e19>] do_invalid_op+0xba/0xc4 (204)
> [<c0103237>] error_code+0x2b/0x30 (116)
> [<c026e662>] scsi_setup_command_freelist+0x94/0x115 (44)
> [<c026f8ca>] scsi_host_alloc+0x26f/0x399 (124)
> [<f8cf173f>] usb_stor_acquire_resources+0x6c/0x10a [usb_storage]
> (28) [<f8cf1c64>] storage_probe+0x1b8/0x259 [usb_storage] (40)
> [<f89ca07a>] usb_probe_interface+0x62/0x7b [usbcore] (28)
> [<c023d723>] driver_probe_device+0x2f/0x70 (24)
> [<c023d7ae>] device_attach+0x4a/0xa5 (40)
> [<c023da89>] bus_add_device+0x4d/0x89 (28)
> [<c023c9a6>] device_add+0xb1/0x137 (40)
> [<f89d1ba6>] usb_set_configuration+0x3ca/0x444 [usbcore] (84)
> [<f89cc822>] usb_new_device+0xa5/0x164 [usbcore] (44)
> [<f89cd6b0>] hub_port_connect_change+0x221/0x426 [usbcore] (56)
> [<f89cda7b>] hub_events+0x1c6/0x39d [usbcore] (56)
> [<f89cdc89>] hub_thread+0x37/0x109 [usbcore] (96)
> [<c01009b1>] kernel_thread_helper+0x5/0xb (142893076)
>Code: e8 57 5e fd ff b8 08 4f be c0 e8 c0 d1 fe ff c7 44 24 08 a7 05
> 00 00 c7 44 24 04 aa 63 2f c0 c7 04 24 54 20 2f c0 e8 31 5e fd ff
> <0f> 0b a7 05 aa 63 2f c0 eb b9 a1 44 1a 33 c0 c7 44 24 04 d0 00
>
>
>After this, any USB related operation is doomed, if not the entire
> system.
>
>Bye.

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
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by Gene Heskett are:
Copyright 2004 by Maurice Eugene Heskett, all rights reserved.
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