On Tue, Feb 24, 2009 at 10:57 PM, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: > > (switched to email. Please respond via emailed reply-to-all, not via the > bugzilla web interface). > > On Mon, 23 Feb 2009 22:08:37 -0800 (PST) > bugme-daemon@xxxxxxxxxxxxxxxxxxx wrote: > >> http://bugzilla.kernel.org/show_bug.cgi?id=12768 > > There's additional info at the link. > >> Summary: usb_alloc_urb() leaks memory together with uvcvideo >> driver >> Product: Drivers >> Version: 2.5 >> KernelVersion: 2.6.28 >> Platform: All >> OS/Version: Linux >> Tree: Mainline >> Status: NEW >> Severity: normal >> Priority: P1 >> Component: USB >> AssignedTo: greg@xxxxxxxxx >> ReportedBy: nm127@xxxxxxxxxxx >> >> >> Latest working kernel version: >> Earliest failing kernel version: >> Distribution: >> Hardware Environment: EeePC 901 >> Software Environment: Debian 5.0 >> Problem Description: >> >> Steps to reproduce: >> 1. Boot the system >> 2. start an xterm window and execute the following command: >> >> $ while true; do clear; cat /proc/slab_allocators |grep usb_alloc; sleep 1; >> done >> >> This will print out similar lines each second: >> >> size-2048: 18 usb_alloc_dev+0x1d/0x212 [usbcore] >> size-2048: 2280 usb_alloc_urb+0xc/0x2b [usbcore] >> size-1024: 85 usb_alloc_urb+0xc/0x2b [usbcore] >> size-128: 10 usb_alloc_urb+0xc/0x2b [usbcore] >> >> 3. Start xawtv, this will show the picture of the webcam >> 4. Exit xawtv >> >> Current result: >> In the output of /proc/slab_allocators the number of blocks allocated by >> usb_alloc_urb() increases, however, the xawtv is no longer running: >> >> size-2048: 18 usb_alloc_dev+0x1d/0x212 [usbcore] >> size-2048: 2280 usb_alloc_urb+0xc/0x2b [usbcore] >> size-1024: 100 usb_alloc_urb+0xc/0x2b [usbcore] >> size-128: 10 usb_alloc_urb+0xc/0x2b [usbcore] >> >> Each time xawtv is started and stopped the value increases at the >> usb_alloc_urb(). >> >> Expected result: the same memory usage is reached again after xawtv exited. >> > > I assume this is a v4l bug and not a USB core bug? > the history of this bug is that someone complained that the em28xx driver leaked, Nemeth traced it back and found out that it also happens with uvcvideo - both drivers kinda have an independent implementation and it happens with both. Markus -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
