[Kernel-packages] [Bug 1837467] Re: segfault when CCD are present in two different HOG services
*** This bug is a duplicate of bug 1836809 *** https://bugs.launchpad.net/bugs/1836809 Reopened bug 1836809. Please use that instead. ** This bug has been marked a duplicate of bug 1836809 segfault when CCD are present in two different HOG services -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to bluez in Ubuntu. https://bugs.launchpad.net/bugs/1837467 Title: segfault when CCD are present in two different HOG services Status in bluez package in Ubuntu: New Bug description: Hello everyone, Test setup: ubuntu 19.04, bluez 5.50, kernel bug id 204201 We are currently developing a device that contains two HID services. That device, as it is right now, is properly functioning on Windows & Android. However, when pairing the device on Linux running bluez 5.50 we do get segfaults (see attached files). Our bluetooth device has 4 services : 1 battery service, 2 HID Over Gatt services and 1 device information service. With trial and error, we managed to find that we wouldn't get any crash as long as only 1 HOG service was present. Here's the interesting part. The two HOG services are made as follows: - standard keyboard over gatt: protocole mode / report map / 1 INPUT report / boot INPUT + OUTPUT / HID information / HID Control point - raw HID over gatt : report map / 1 INPUT report / 1 OUTPUT report / HID information / HID control point Looking at the write_ccc in the call stacks we wondered if the callbacks subscribing to notifications for the INPUT reports were causing this issue. We therefore changed the raw HID over gatt (and its report map) to remove the INPUT report and change it into 1 OUTPUT report (leading to 2 OUTPUT reports): no crash. We therefore hypothesize that the segfault occurs when subscribing to notification on a second HOG service... To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bluez/+bug/1837467/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1837467] Re: segfault when CCD are present in two different HOG services
** Attachment added: "callstacks" https://bugs.launchpad.net/ubuntu/+source/bluez/+bug/1837467/+attachment/5278556/+files/callstacks.txt -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to bluez in Ubuntu. https://bugs.launchpad.net/bugs/1837467 Title: segfault when CCD are present in two different HOG services Status in bluez package in Ubuntu: New Bug description: Hello everyone, Test setup: ubuntu 19.04, bluez 5.50, kernel bug id 204201 We are currently developing a device that contains two HID services. That device, as it is right now, is properly functioning on Windows & Android. However, when pairing the device on Linux running bluez 5.50 we do get segfaults (see attached files). Our bluetooth device has 4 services : 1 battery service, 2 HID Over Gatt services and 1 device information service. With trial and error, we managed to find that we wouldn't get any crash as long as only 1 HOG service was present. Here's the interesting part. The two HOG services are made as follows: - standard keyboard over gatt: protocole mode / report map / 1 INPUT report / boot INPUT + OUTPUT / HID information / HID Control point - raw HID over gatt : report map / 1 INPUT report / 1 OUTPUT report / HID information / HID control point Looking at the write_ccc in the call stacks we wondered if the callbacks subscribing to notifications for the INPUT reports were causing this issue. We therefore changed the raw HID over gatt (and its report map) to remove the INPUT report and change it into 1 OUTPUT report (leading to 2 OUTPUT reports): no crash. We therefore hypothesize that the segfault occurs when subscribing to notification on a second HOG service... To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bluez/+bug/1837467/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
