Re: [RFC 0/2] target refcounting infrastructure fixes for usb

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On Mon, Dec 16, 2013 at 07:10:19AM -0800, James Bottomley wrote:
> This set should fix our target problems with USB by making the target
> visibility properly reference counted.  Since it's a major change to the
> infrastructure, we'll incubate upstream first before backporting to
> stable.
> 
> James

I tried these patches, and they cause an oops when a USB mass storage
device is plugged in.  Note that this device uses the usb-storage
driver, not the uas driver.

[14248.340064] scsi6 : usb-storage 2-2:1.0
[14248.341083] usbcore: registered new interface driver usb-storage
[14248.346211] usbcore: registered new interface driver uas
[14249.339937] scsi 6:0:0:0: Direct-Access     Lexar    JumpDrive        1.00 PQ: 0 ANSI: 6
[14249.340988] ------------[ cut here ]------------
[14249.340999] WARNING: CPU: 3 PID: 5578 at lib/kobject.c:227 kobject_add_internal+0x13f/0x350()
[14249.341003] kobject_add_internal failed for 6:0:0:0 (error: -2 parent: target6:0:0)
[14249.341005] Modules linked in: uas usb_storage ctr ccm cuse dm_crypt uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev btusb x86_pkg_temp_thermal coretemp ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd arc4 iwldvm mac80211 microcode snd_hda_codec_hdmi iwlwifi psmouse snd_hda_codec_realtek serio_raw snd_hda_intel snd_usb_audio snd_hda_codec thinkpad_acpi cfg80211 joydev snd_usbmidi_lib nvram snd_hwdep snd_seq_midi snd_pcm snd_seq_midi_event snd_rawmidi lpc_ich rfcomm bnep snd_seq bluetooth snd_seq_device snd_page_alloc ehci_pci snd_timer ehci_hcd snd soundcore tpm_tis binfmt_misc btrfs libcrc32c xor raid6_pq hid_generic usbhid hid i915 ahci libahci e1000e sdhci_pci sdhci i2c_algo_bit drm_kms_helper ptp pps_core drm xhci_hcd video
[14249.341095] CPU: 3 PID: 5578 Comm: kworker/u16:0 Not tainted 3.13.0-rc1+ #142
[14249.341098] Hardware name: LENOVO 2325AP7/2325AP7, BIOS G2ET82WW (2.02 ) 09/11/2012
[14249.341105] Workqueue: events_unbound async_run_entry_fn
[14249.341108]  0000000000000009 ffff88003aa9db60 ffffffff81658a4e ffff88003aa9dba8
[14249.341115]  ffff88003aa9db98 ffffffff81048c3d ffff88006bc551b0 00000000fffffffe
[14249.341121]  0000000000000000 ffff8800bec22838 0000000000000200 ffff88003aa9dbf8
[14249.341127] Call Trace:
[14249.341135]  [<ffffffff81658a4e>] dump_stack+0x4d/0x66
[14249.341142]  [<ffffffff81048c3d>] warn_slowpath_common+0x7d/0xa0
[14249.341148]  [<ffffffff81048cac>] warn_slowpath_fmt+0x4c/0x50
[14249.341154]  [<ffffffff81660f17>] ? _raw_spin_unlock+0x27/0x40
[14249.341159]  [<ffffffff8133748f>] kobject_add_internal+0x13f/0x350
[14249.341163]  [<ffffffff813379b5>] kobject_add+0x65/0xb0
[14249.341170]  [<ffffffff81425b40>] ? get_device+0x30/0x30
[14249.341175]  [<ffffffff81649781>] ? klist_init+0x31/0x40
[14249.341181]  [<ffffffff81427208>] device_add+0x128/0x660
[14249.341186]  [<ffffffff814369cc>] ? __pm_runtime_resume+0x5c/0x90
[14249.341193]  [<ffffffff8145bcdc>] scsi_sysfs_add_sdev+0xac/0x340
[14249.341199]  [<ffffffff8145a443>] do_scan_async+0x83/0x180
[14249.341204]  [<ffffffff81074247>] async_run_entry_fn+0x37/0x130
[14249.341210]  [<ffffffff81066524>] process_one_work+0x1f4/0x550
[14249.341215]  [<ffffffff810664c2>] ? process_one_work+0x192/0x550
[14249.341220]  [<ffffffff81067261>] worker_thread+0x121/0x3a0
[14249.341225]  [<ffffffff81067140>] ? manage_workers.isra.22+0x2a0/0x2a0
[14249.341231]  [<ffffffff8106dc8c>] kthread+0xfc/0x120
[14249.341238]  [<ffffffff8106db90>] ? kthread_create_on_node+0x230/0x230
[14249.341243]  [<ffffffff81669cac>] ret_from_fork+0x7c/0xb0
[14249.341249]  [<ffffffff8106db90>] ? kthread_create_on_node+0x230/0x230
[14249.341253] ---[ end trace 7f1d8a449e6af5aa ]---
[14249.341259] scsi 6:0:0:0: failed to add device: -2

Sarah Sharp
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