On Wed, 11 Dec 2013, Eugene Shatokhin wrote: > Hi, > > On ROSA Linux with kernel 3.10.21 with DMA debug options enabled, the > kernel sometimes issues a warning about DMA pool corruption (see the log > below). > > That happens sometimes, when the system boots or resumes from > hibernation with Samson C01U USB microphone attached. > > The affected DMA pool is 'uhci->td_pool', uhci_alloc_td() from > drivers/usb/host/uhci-hcd.c makes the relevant dma_pool_alloc() calls. > > Any ideas about how to find what causes this and how to fix it? This is not an easy sort of thing to track down... > Here is the relevant part of the system log: > ---------------------------- > [ 22.264332] usb 2-1: new full-speed USB device number 2 using uhci_hcd > [ 22.450609] usb 2-1: New USB device found, idVendor=17a0, idProduct=0001 > [ 22.450626] usb 2-1: New USB device strings: Mfr=1, Product=2, > SerialNumber=0 > [ 22.450639] usb 2-1: Product: Samson C01U > [ 22.450649] usb 2-1: Manufacturer: Samson Technologies > <...> > [ 280.703483] retire_capture_urb: 4494 callbacks suppressed > [ 284.961087] uhci_hcd 0000:00:1d.1: dma_pool_alloc uhci_td, efb7b060 > (corruped) > [ 284.961087] 00000000: 00 06 00 00 af 00 00 03 a7 a7 a7 a7 a7 a7 a7 a7 > ................ > [ 284.961087] 00000010: a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 > ................ > [ 284.961087] 00000020: a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 > ................ > [ 284.961087] retire_capture_urb: 4343 callbacks suppressed > [ 284.961087] uhci_hcd 0000:00:1d.1: dma_pool_alloc uhci_td, efb7b5d0 > (corruped) > [ 284.961087] 00000000: 00 06 00 00 af 00 00 03 a7 a7 a7 a7 a7 a7 a7 a7 > ................ > [ 284.961087] 00000010: a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 > ................ > [ 284.961087] 00000020: a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 a7 > ................ > [ 284.961087] cannot submit urb (err = -27) > [ 284.961087] cannot submit urb (err = -27) > [ 284.961087] cannot submit urb (err = -27) > [ 284.961087] cannot submit urb (err = -27) > [ 284.961087] cannot submit urb (err = -27) > [ 284.961087] cannot submit urb (err = -27) > [ 284.961087] cannot submit urb (err = -27) > [ 284.961087] cannot submit urb (err = -27) > ---------------------------- > > 0xa7 is POOL_POISON_FREED. The memory pages to be allocated from the > pool should be filled with such bytes. > > Each time I observed this problem, the first 8 bytes of the listed > memory area were overwritten, with different data each time. It kind of looks like a hardware bug. Still, it's hard to say. Can you test the current 3.13-rc kernel? There have been a few recent changes in this area that might have an effect. Alan Stern -- 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
