[BUG: 2.6.22-rc2] SLAB doesn't like usb_get_configuration()

["Indan Zupancic" <indan@nul.nu>]

Hello,

I had two SLAb related bugs, both with usb_get_configuration()
near the end of the backtrace. First one was with git between
rc1 and rc2, but very close to rc2, second one was with rc2,
both at bootup.

Oh, almost forgot: First one uses SLAB, second one SLUB.

[   85.574686] usb 2-1: new full speed USB device using ohci_hcd and address 2
[   85.709684] BUG: at /home/indan/src/git/linux-2.6/mm/slab.c:777 __find_genera
l_cachep()
[   85.709693]  [<b014be2f>] __kmalloc+0x3f/0xa0
[   85.709709]  [<b013d271>] __kzalloc+0xd/0x34
[   85.709720]  [<c09a9d78>] usb_get_configuration+0x93e/0xd26 [usbcore]
[   85.709761]  [<c09a7459>] usb_control_msg+0xbe/0xc8 [usbcore]
[   85.709784]  [<c09a856a>] usb_get_device_descriptor+0x72/0x7c [usbcore]
[   85.709804]  [<c09a3259>] hub_port_init+0x55d/0x567 [usbcore]
[   85.709823]  [<c09a3914>] usb_new_device+0x17/0xdd [usbcore]
[   85.709841]  [<c09a435f>] hub_thread+0x6cc/0xa4a [usbcore]
[   85.709862]  [<b0125dff>] autoremove_wake_function+0x0/0x35
[   85.709871]  [<c09a3c93>] hub_thread+0x0/0xa4a [usbcore]
[   85.709888]  [<b0125d47>] kthread+0x36/0x5b
[   85.709893]  [<b0125d11>] kthread+0x0/0x5b
[   85.709898]  [<b010476b>] kernel_thread_helper+0x7/0x10
[   85.709907]  =======================

and

[   30.420891] usb 2-1: new full speed USB device using ohci_hcd and address 2
[   30.555891] BUG: at /home/indan/src/git/linux-2.6/include/linux/slub_def.h:77 kmalloc_index()
[   30.555901]  [<b014d02c>] get_slab+0x43/0x214
[   30.555913]  [<c09acc18>] usb_get_configuration+0x923/0xd07 [usbcore]
[   30.555951]  [<b014e16a>] __kmalloc_track_caller+0xf/0x56
[   30.555959]  [<b013d2b1>] __kzalloc+0x11/0x38
[   30.555971]  [<c09acc18>] usb_get_configuration+0x923/0xd07 [usbcore]
[   30.555991]  [<c09aa34d>] usb_control_msg+0xbe/0xc8 [usbcore]
[   30.556014]  [<c09a6234>] hub_port_init+0x559/0x563 [usbcore]
[   30.556033]  [<c09a68d4>] usb_new_device+0x17/0xdd [usbcore]
[   30.556052]  [<c09a72da>] hub_thread+0x68f/0x9f8 [usbcore]
[   30.556071]  [<b027252f>] __sched_text_start+0x497/0x539
[   30.556080]  [<b0125e27>] autoremove_wake_function+0x0/0x35
[   30.556089]  [<c09a6c4b>] hub_thread+0x0/0x9f8 [usbcore]
[   30.556107]  [<b0125d6f>] kthread+0x36/0x5b
[   30.556112]  [<b0125d39>] kthread+0x0/0x5b
[   30.556118]  [<b010476b>] kernel_thread_helper+0x7/0x10
[   30.556125]  =======================

Both are triggered by WARN_ON_ONCE(size == 0),

Full dmesg outputs and config for second bug attached.

Greetings,

Indan

Attachment: SLABBUG
Description: Binary data

Attachment: SLABBUG2
Description: Binary data

Attachment: .config
Description: Binary data