AltTab 4.8.1 crashes multiple times a day

[alt-tab-macos-bot]

This issue was opened by a bot after a user submitted feedback through the in-app form.

From: hello@kovacs-krisztian.hu

Message:

Dear Support,

I really like this app, but it quits often. I don’t use sleep, but it still quits several times a day. I don't know why, but I also use BetterTouchTool, maybe that's the reason?

Thanks! Krisztian

Debug profile

* App version: 4.8.1 * App preferences: * NSStatusItem Preferred Position Item-0: 20482.14453125 * NSWindow Frame SUUpdateAlert: 1610 901 620 392 0 0 3840 1577 * NSWindow Frame com.sindresorhus.Preferences.FrameAutosaveName: 1623 1384 443 174 0 0 3840 1577 * SUHasLaunchedBefore: 1 * SULastCheckTime: 2020-07-22 09:56:37 +0000 * SUUpdateGroupIdentifier: 3628683491 * SUUpdateRelaunchingMarker: 0 * alignThumbnails: 1 * holdShortcut: ⌥⌘ * preferencesVersion: 4.8.1 * startAtLogin: true * theme: 0 * windowDisplayDelay: 65 * Applications: 65 * Windows: 12 * {isFullscreen: false, isMinimized: false, isHidden: false, isTabbed: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 1} * {isFullscreen: false, isMinimized: false, isHidden: false, isTabbed: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 1} * {isFullscreen: false, isMinimized: false, isHidden: false, isTabbed: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 1} * {isFullscreen: false, isMinimized: false, isHidden: false, isTabbed: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 1} * {isFullscreen: false, isMinimized: false, isHidden: false, isTabbed: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 1} * {isFullscreen: false, isMinimized: false, isHidden: false, isTabbed: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 1} * {isFullscreen: false, isMinimized: false, isHidden: false, isTabbed: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 1} * {isFullscreen: false, isMinimized: false, isHidden: false, isTabbed: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 1} * {isFullscreen: false, isMinimized: false, isHidden: false, isTabbed: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 1} * {isFullscreen: false, isMinimized: false, isHidden: false, isTabbed: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 1} * {isFullscreen: false, isMinimized: false, isHidden: false, isTabbed: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 1} * {isFullscreen: false, isMinimized: false, isHidden: false, isTabbed: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 1} * OS version: 10.15.6 verzió (19G73 build) * OS architecture: x86_64 * Locale: hu_HU (current) * Spaces: 1 * Dark mode: Light * "Displays have separate Spaces": checked * Hardware model: Macmini8,1 * Screens: 1 * {x: 0.0, y: 0.0, width: 3840.0, height: 1600.0} * CPU model: Intel(R) Core(TM) i7-8700B CPU @ 3.20GHz * Memory size: 17,18 GB * Active CPU count: 12 * Current CPU frequency: 3.2 Ghz * Resource utilization: * CPU: 0.0% * Memory: 57M- * Threads count: 12

[lwouis]

Hi Krisztian! Thanks for sharing this issue!

Could you please share the crash reports you have, in this ticket? Here is how:

Open Console.app, search for AltTab in the Crash Report section:

Right-click on the line for the crash you want to share, then "Reveal in Finder":

You can then share the file here. I suggest compressing it into a .zip first.

Thanks!

[TigerCat-hu]

Hi, thanks for your support!

Here is the file: https://www.dropbox.com/s/s44vzbqc79vvyob/alttab.zip?dl=0

[lwouis]

@TigerCat-hu thanks a lot for these crash reports!

There were 2 different types of crashes among the 7 crash report files. These reports are very low-level but I think I found clues of the root causes:

• some out of bound access, when there are no open window on the system
• some pointer memory issue because of incorrect casting from bytes array to pointer in swift, when focusing a window

Do you think these 2 situations would be when you noticed the app crashing?

I made 2 fixes for the 2 alleged root causes. This will be shipped in the next release. Hopefully this makes the app more stable! 👍