Re: [PATCH] base/class.c: prevent ooops due to insert/remove race

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Mark Lord wrote:

Mark Lord wrote:
...
And here is a "prevented" oops, courtesy of the patch (2.6.23.8).
These are easy to reproduce (just jiggle the connection on an
attached USB multi-card reader with a CF card inserted):

...

[  347.099562] usb 5-6: USB disconnect, address 10
[ 347.101077] BUG: unable to handle kernel NULL pointer dereference at virtual address 00000000 

...


Mmmm.. that's odd.  It *did* Oops there.  I wonder how/why ?

Perhaps a *MAINTAINER* could take an interest in decoding the exact C-stmt
that crashed ?


[  347.101086]  printing eip:
[  347.101088] c01bfe2d
[  347.101091] *pde = 00000000
[  347.101095] Oops: 0000 [#1]
[ 347.101098] PREEMPT SMP [ 347.101102] Modules linked in: nls_iso8859_1 nls_cp437 vfat fat usb_storage libusual microcode binfmt_misc rfcomm l2cap bluetooth nfs nfsd exportfs lockd nfs_acl auth_rpcgss sunrpc acpi_cpufreq cpufreq_stats cpufreq_userspace cpufreq_ondemand freq_table cpufreq_powersave container fan firmware_class pciehp pci_hotplug usbhid hid visor af_packet usbserial fuse firewire_sbp2 mousedev snd_hda_intel snd_pcm_oss snd_pcm snd_mixer_oss snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi serio_raw snd_seq_midi_event snd_seq snd_timer snd_seq_device firewire_ohci firewire_core b44 mii thermal ehci_hcd uhci_hcd usbcore sdhci pcspkr sr_mod cdrom mmc_core crc_itu_t sg ac psmouse processor snd soundcore intel_agp agpgart battery button snd_page_alloc unix 
[  347.101196] CPU:    1
[  347.101197] EIP:    0060:[strlen+8/17]    Not tainted VLI
[  347.101199] EFLAGS: 00010246   (2.6.23.8 #6)
[  347.101209] EIP is at strlen+0x8/0x11
[ 347.101212] eax: 00000000 ebx: 0000000b ecx: ffffffff edx: f6cad204 [ 347.101217] esi: c02f6887 edi: 00000000 ebp: f6cad204 esp: f7152e58 
[  347.101221] ds: 007b   es: 007b   fs: 00d8  gs: 0000  ss: 0068
[ 347.101226] Process khubd (pid: 2087, ti=f7152000 task=c29beaa0 task.ti=f7152000) [ 347.101229] Stack: f6cad204 c020ed4c f6cad1fc c03297f4 c0329780 c020ee65 00000000 f6cad1fc [ 347.101240] f6cad098 00000202 f5a70000 c020eef9 f6cad000 c021ab43 f6cad000 f77e0000 [ 347.101250] c021868c f77e0038 f77e0000 c02139bc f77e02ec f77e0000 f8be27c0 f8bd6691 [ 347.101261] Call Trace: 
[  347.101268]  [make_class_name+29/87] make_class_name+0x1d/0x57
[  347.101280]  [class_device_del+131/271] class_device_del+0x83/0x10f
[ 347.101291] [class_device_unregister+8/16] class_device_unregister+0x8/0x10 [ 347.101300] [__scsi_remove_device+43/104] __scsi_remove_device+0x2b/0x68 
[  347.101309]  [scsi_forget_host+45/74] scsi_forget_host+0x2d/0x4a
[  347.101319]  [scsi_remove_host+101/213] scsi_remove_host+0x65/0xd5
[ 347.101329] [<f8bd6691>] quiesce_and_remove_host+0x99/0xa7 [usb_storage] Nov 29 12:39:07 corey kernel: [ 347.101346] [<f8bd6763>] storage_disconnect+0xe/0x16 [usb_storage] Nov 29 12:39:07 corey kernel: [ 347.101361] [<f88d7a50>] usb_unbind_interface+0x44/0x94 [usbcore] Nov 29 12:39:07 corey kernel: [ 347.101409] [__device_release_driver+113/142] __device_release_driver+0x71/0x8e Nov 29 12:39:07 corey kernel: [ 347.101418] [device_release_driver+30/52] device_release_driver+0x1e/0x34 Nov 29 12:39:07 corey kernel: [ 347.101426] [bus_remove_device+109/125] bus_remove_device+0x6d/0x7d Nov 29 12:39:07 corey kernel: [ 347.101434] [device_del+460/576] device_del+0x1cc/0x240 Nov 29 12:39:07 corey kernel: [ 347.101444] [<f88d53f9>] usb_disable_device+0x5c/0xbb [usbcore] Nov 29 12:39:07 corey kernel: [ 347.101489] [<f88d1aff>] usb_disconnect+0x83/0x11b [usbcore] Nov 29 12:39:07 corey kernel: [ 347.101537] [<f88d220d>] hub_thread+0x388/0xa8d [usbcore] Nov 29 12:39:07 corey kernel: [ 347.101586] [schedule+1417/1463] __sched_text_start+0x589/0x5b7 Nov 29 12:39:07 corey kernel: [ 347.101602] [autoremove_wake_function+0/53] autoremove_wake_function+0x0/0x35 Nov 29 12:39:07 corey kernel: [ 347.101615] [<f88d1e85>] hub_thread+0x0/0xa8d [usbcore] Nov 29 12:39:07 corey kernel: [ 347.101656] [kthread+56/95] kthread+0x38/0x5f Nov 29 12:39:07 corey kernel: [ 347.101663] [kthread+0/95] kthread+0x0/0x5f Nov 29 12:39:07 corey kernel: [ 347.101669] [kernel_thread_helper+7/16] kernel_thread_helper+0x7/0x10 
Nov 29 12:39:07 corey kernel: [  347.101681]  =======================
Nov 29 12:39:07 corey kernel: [ 347.101683] Code: f0 48 5e c3 56 89 d1 89 c6 83 ec 04 31 d2 89 c8 88 c4 ac 38 e0 75 03 8d 56 ff 84 c0 75 f4 5e 89 d0 5e c3 57 83 c9 ff 89 c7 31 c0 <f2> ae f7 d1 49 5f 89 c8 c3 57 89 c7 89 d0 31 d2 85 c9 74 0c f2 Nov 29 12:39:07 corey kernel: [ 347.101738] EIP: [strlen+8/17] strlen+0x8/0x11 SS:ESP 0068:f7152e58 Nov 29 12:39:07 corey kernel: [ 345.226354] sd 7:0:0:0: [sdc] READ CAPACITY failed Nov 29 12:39:07 corey kernel: [ 345.226360] sd 7:0:0:0: [sdc] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK Nov 29 12:39:07 corey kernel: [ 345.226367] sd 7:0:0:0: [sdc] Sense not available. Nov 29 12:39:07 corey kernel: [ 345.226382] sd 7:0:0:0: [sdc] Write Protect is off Nov 29 12:39:07 corey kernel: [ 345.226386] sd 7:0:0:0: [sdc] Mode Sense: 00 00 00 00 Nov 29 12:39:07 corey kernel: [ 345.226390] sd 7:0:0:0: [sdc] Assuming drive cache: write through Nov 29 12:39:07 corey kernel: [ 345.226471] sd 7:0:0:0: [sdc] Attached SCSI removable disk Nov 29 12:39:07 corey kernel: [ 345.226539] sd 7:0:0:0: Attached scsi generic sg2 type 0 Nov 29 12:39:07 corey kernel: [ 347.151887] sd 7:0:0:0: [sdc] READ CAPACITY failed Nov 29 12:39:07 corey kernel: [ 347.151895] sd 7:0:0:0: [sdc] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK Nov 29 12:39:07 corey kernel: [ 347.151902] sd 7:0:0:0: [sdc] Sense not available. Nov 29 12:39:07 corey kernel: [ 347.151918] sd 7:0:0:0: [sdc] Write Protect is off Nov 29 12:39:07 corey kernel: [ 347.151922] sd 7:0:0:0: [sdc] Mode Sense: 00 00 00 00 Nov 29 12:39:07 corey kernel: [ 347.151927] sd 7:0:0:0: [sdc] Assuming drive cache: write through Nov 29 12:39:07 corey kernel: [ 347.151981] sd 7:0:0:0: [sdc] READ CAPACITY failed Nov 29 12:39:07 corey kernel: [ 347.151985] sd 7:0:0:0: [sdc] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK Nov 29 12:39:07 corey kernel: [ 347.151993] sd 7:0:0:0: [sdc] Sense not available. Nov 29 12:39:07 corey kernel: [ 347.152008] sd 7:0:0:0: [sdc] Write Protect is off Nov 29 12:39:07 corey kernel: [ 347.152013] sd 7:0:0:0: [sdc] Mode Sense: 00 00 00 00 Nov 29 12:39:07 corey kernel: [ 347.152017] sd 7:0:0:0: [sdc] Assuming drive cache: write through Nov 29 12:39:07 corey kernel: [ 345.279916] sd 7:0:0:0: [sdc] READ CAPACITY failed Nov 29 12:39:07 corey kernel: [ 345.279951] sd 7:0:0:0: [sdc] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK Nov 29 12:39:07 corey kernel: [ 345.279965] sd 7:0:0:0: [sdc] Sense not available. Nov 29 12:39:07 corey kernel: [ 345.279982] sd 7:0:0:0: [sdc] Write Protect is off Nov 29 12:39:07 corey kernel: [ 345.279987] sd 7:0:0:0: [sdc] Mode Sense: 00 00 00 00 Nov 29 12:39:07 corey kernel: [ 345.279991] sd 7:0:0:0: [sdc] Assuming drive cache: write through Nov 29 12:39:07 corey kernel: [ 345.280047] sd 7:0:0:0: [sdc] READ CAPACITY failed Nov 29 12:39:07 corey kernel: [ 345.280051] sd 7:0:0:0: [sdc] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK Nov 29 12:39:07 corey kernel: [ 345.280059] sd 7:0:0:0: [sdc] Sense not available. Nov 29 12:39:07 corey kernel: [ 345.280075] sd 7:0:0:0: [sdc] Write Protect is off Nov 29 12:39:07 corey kernel: [ 345.280079] sd 7:0:0:0: [sdc] Mode Sense: 00 00 00 00 Nov 29 12:39:07 corey kernel: [ 345.280083] sd 7:0:0:0: [sdc] Assuming drive cache: write through Nov 29 12:39:07 corey kernel: [ 345.289528] sd 7:0:0:0: [sdc] READ CAPACITY failed Nov 29 12:39:07 corey kernel: [ 345.289536] sd 7:0:0:0: [sdc] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK Nov 29 12:39:07 corey kernel: [ 345.289542] sd 7:0:0:0: [sdc] Sense not available. Nov 29 12:39:07 corey kernel: [ 345.289560] sd 7:0:0:0: [sdc] Write Protect is off Nov 29 12:39:07 corey kernel: [ 345.289564] sd 7:0:0:0: [sdc] Mode Sense: 00 00 00 00 Nov 29 12:39:07 corey kernel: [ 345.289569] sd 7:0:0:0: [sdc] Assuming drive cache: write through 



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