On Fri, 2009-07-10 at 15:32 +0100, Ian Lynagh wrote: > Hi all, > > [1.] PROBLEM: USB wlan device stops working; ehci "kernel BUG" > > [2.] > > I am having a problem with an rt73usb and/or ehci. I /think/ the bug is > in ehci, and the rt73usb problems are just a symptom, but I'm not sure. Actually, I'm using the current wireless-testing, and I'm getting following in the kernel log on rt73us unload: usbcore: deregistering interface driver rt73usb ============================================================================= BUG kmalloc-16: Redzone overwritten ----------------------------------------------------------------------------- INFO: 0xffff88012d860f88-0xffff88012d860f8b. First byte 0xb instead of 0xcc INFO: Allocated in rt2x00usb_probe+0xb9/0x180 [rt2x00usb] age=6413897 cpu=1 pid=21955 INFO: Freed in fsnotify_put_event+0x3b/0x70 age=16350710 cpu=3 pid=2508 INFO: Slab 0xffffea00067a6100 objects=46 used=46 fp=0x(null) flags=0x8000000000000083 INFO: Object 0xffff88012d860f78 @offset=3960 fp=0x(null) Bytes b4 0xffff88012d860f68: 0d 49 0a 00 01 00 00 00 5a 5a 5a 5a 5a 5a 5a 5a .I......ZZZZZZZZ Object 0xffff88012d860f78: 00 00 00 00 0c 2c 00 00 86 07 00 00 51 8e 06 00 .....,......Q... Redzone 0xffff88012d860f88: 0b ba 0c 00 cc cc cc cc .º..ÌÌÌÌ Padding 0xffff88012d860fc8: 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZ Pid: 3978, comm: rmmod Not tainted 2.6.31-rc2-wl #153 Call Trace: [<ffffffff810a42a1>] print_trailer+0x101/0x170 [<ffffffff810a49d2>] check_bytes_and_report+0xf2/0x120 [<ffffffffa01df098>] ? rt2x00usb_free_reg+0x18/0x60 [rt2x00usb] [<ffffffff810a4a65>] check_object+0x65/0x260 [<ffffffffa01df098>] ? rt2x00usb_free_reg+0x18/0x60 [rt2x00usb] [<ffffffff810a5563>] __slab_free+0x203/0x330 [<ffffffffa01df098>] ? rt2x00usb_free_reg+0x18/0x60 [rt2x00usb] [<ffffffff810a6d47>] kfree+0xf7/0x130 [<ffffffffa01df098>] rt2x00usb_free_reg+0x18/0x60 [rt2x00usb] [<ffffffffa01df113>] rt2x00usb_disconnect+0x33/0x70 [rt2x00usb] [<ffffffff812b8764>] usb_unbind_interface+0xb4/0x100 [<ffffffff81255e11>] __device_release_driver+0x61/0xc0 [<ffffffff81255f30>] driver_detach+0xc0/0xd0 [<ffffffff81254fa7>] bus_remove_driver+0x97/0xc0 [<ffffffff812564f9>] driver_unregister+0x59/0x90 [<ffffffff812b847e>] usb_deregister+0xbe/0xd0 [<ffffffffa01e7784>] rt73usb_exit+0x10/0x12 [rt73usb] [<ffffffff8106f1d5>] sys_delete_module+0x185/0x260 [<ffffffff8100bd69>] ? retint_swapgs+0xe/0x13 [<ffffffff81063f15>] ? trace_hardirqs_on_caller+0x145/0x190 [<ffffffff813c686e>] ? trace_hardirqs_on_thunk+0x3a/0x3f [<ffffffff8100b32b>] system_call_fastpath+0x16/0x1b FIX kmalloc-16: Restoring 0xffff88012d860f88-0xffff88012d860f8b=0xcc So I think rt73usb is the main suspect. Before this is fixed, we should probably not suspect EHCI. -- Regards, Pavel Roskin -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
