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
Hi
On 26.06.2018 11:20, Vegard Nossum wrote:
> 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.
>
>
Does patch
2278446 xhci: Fix USB3 NULL pointer dereference at logical disconnect.
help?
It should be in 4.17-rc6
-Mathias