linux-kernel - 4.17.0-rc3+ BUG kmalloc-2048: Poison overwritten (USB hub disconnect)

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Date:   Tue, 26 Jun 2018 10:20:34 +0200
From:   Vegard Nossum <vegard.nossum@...il.com>
To:     linux-usb@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        platform-driver-x86@...r.kernel.org
Subject: 4.17.0-rc3+ BUG kmalloc-2048: Poison overwritten (USB hub disconnect)

Hi,

I've been seeing variants of this when I plug/unplug my ThinkPad T460
from the docking station:

usb 2-4: USB disconnect, device number 30
usb 2-4.1: USB disconnect, device number 31
thinkpad_acpi: undocked from hotplug port replicator
thinkpad_acpi: EC reports that Thermal Table has changed
usb 1-4: USB disconnect, device number 61
usb 1-4.1: USB disconnect, device number 63
usb 1-4.4: USB disconnect, device number 62
=============================================================================
BUG kmalloc-2048 (Tainted: G    B            ): Poison overwritten
-----------------------------------------------------------------------------

INFO: 0x00000000f262b063-0x00000000ccb4f11c. First byte 0x0 instead of 0x6b
INFO: Allocated in usb_alloc_dev+0x35/0x329 age=6894431 cpu=0 pid=27384
        __slab_alloc+0x20/0x40
        kmem_cache_alloc_trace+0x1ee/0x230
        usb_alloc_dev+0x35/0x329
        hub_event+0xba8/0x15c0
        process_one_work+0x148/0x3d0
        worker_thread+0x4b/0x460
        kthread+0x102/0x140
        ret_from_fork+0x35/0x40
INFO: Freed in usb_release_dev+0x60/0x70 age=0 cpu=0 pid=32750
        kfree+0x176/0x1a0
        usb_release_dev+0x60/0x70
        device_release+0x32/0x90
        kobject_put+0x82/0x190
        put_device+0x17/0x20
        usb_disconnect+0x1b2/0x290
        usb_disconnect+0x1f3/0x290
        hub_event+0x94f/0x15c0
        process_one_work+0x148/0x3d0
        worker_thread+0x4b/0x460
        kthread+0x102/0x140
        ret_from_fork+0x35/0x40
INFO: Slab 0x00000000f6509278 objects=13 used=13 fp=0x          (null)
flags=0x17fffc000008100
INFO: Object 0x00000000a7692b6c @offset=4776 fp=0x0000000078ed8ddc

I don't have the source/config for this kernel anymore, sorry. Will
probably try a newer kernel at some point to see if it's still
present, it might already be fixed. I just wanted to send a report
just in case it has enough info for somebody to spot what went wrong
without too much effort.

See attachment for fuller log + timestamps. The tainted bits are from
earlier reports of the same type.


Vegard

View attachment "BUG.txt" of type "text/plain" (77453 bytes)