On Wed, 11 Nov 2009, Rafael J. Wysocki wrote: > > I thought that the problem was somehow related to user space, because it only > happens after we've thawed tasks. At least, all of the call traces I was able > to collect indicated so. > > Moreover, in a few cases I got > > kernel: PM: Finishing wakeup. > kernel: Restarting tasks ... > kernel: usb 5-2: USB disconnect, address 2 > kernel: done. > bluetoothd[3445]: HCI dev 0 unregistered > bluetoothd[3445]: Unregister path: /org/bluez/3445/hci0 > bluetoothd[3445]: Unregistered interface org.bluez.NetworkPeer on path /org/bluez/3445/hci0 > bluetoothd[3445]: Unregistered interface org.bluez.NetworkHub on path /org/bluez/3445/hci0 > bluetoothd[3445]: Unregistered interface org.bluez.NetworkRouter on path /org/bluez/3445/hci0 > kernel: Slab corruption: size-512 start=ffff88007f1182b0, len=512 > > and so on (of course, the bluetoothd PID was different each time), so I thought > that the problem might be related to Bluetooth. Hmm. Sounds reasonable. It's still that 'size-512', but if the sound subsystem and the bluetooth code both happen to use that size, that would explain why there was sound data in the slab. > So, I've disabled the Bluetooth subsystem in the kernel config and I'm not able > to reproduce the problem any more (at least not within 50 consecutive > suspend-resume and hibernate-resume cycles). Thus Bluetooth seems to be > at least necessary to reproduce the issue and perhaps it's also the cause of > it. Which BT driver are you using? Maybe it's specific to the low-level driver? For example, I could imagine that (say) a USB bluetooth dongle (I think they are common for for mice, and are sometimes built-in on the motherboard) could get the USB "disconnect" event, and get freed while some work from the resume is still pending. I'm looking at btusb_disconnect(), for example. It's one of the few BT drivers that seem to use workqueues, and I'm not seeing a cancel_work_sync() in the disconnect routine - but maybe the btusb_close() routine is called indirectly some way that I just don't see. Marcel? Linus _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
