Describe the bug
Game segfaults after start, when orange game menu starts to appear. Happened just once after 20+ hours of playing.

Crash info + stack trace:

           PID: 148860 (hlvr)
           UID: 1000 (im)
           GID: 1000 (im)
        Signal: 11 (SEGV)
     Timestamp: Fri 2020-07-03 06:39:57 +05 (4h 6min ago)
  Command Line: /home/im/.local/share/Steam/steamapps/common/Half-Life Alyx/game/bin/linuxsteamrt64/hlvr -vr -steam -noasserts -nopassiveasserts +map startup -vulkan -w 800 -h 600 -window
    Executable: /home/im/.local/share/Steam/steamapps/common/Half-Life Alyx/game/bin/linuxsteamrt64/hlvr
 Control Group: /user.slice/user-1000.slice/session-2.scope
          Unit: session-2.scope
         Slice: user-1000.slice
       Session: 2
     Owner UID: 1000 (im)
       Boot ID: 2f9d2f42d86a4da7bd67fa1d9cd1cf75
    Machine ID: f2472ce54d214fe59461cc2a3586dee4
      Hostname: im-desktop.local
       Storage: /var/lib/systemd/coredump/core.hlvr.1000.2f9d2f42d86a4da7bd67fa1d9cd1cf75.148860.1593740397000000000000.lz4
       Message: Process 148860 (hlvr) of user 1000 dumped core.
                
                Stack trace of thread 148860:
                #0  0x00007f4e36b45f45 n/a (/home/im/.local/share/Steam/steamapps/common/Half-Life Alyx/game/hlvr/bin/linuxsteamrt64/libserver.so + 0x1659f45)
                #1  0x00007f4e6ea3db5a n/a (/home/im/.local/share/Steam/steamapps/common/Half-Life Alyx/game/bin/linuxsteamrt64/libengine2.so + 0x41db5a)
                #2  0x00007f4e368f1ae4 n/a (/home/im/.local/share/Steam/steamapps/common/Half-Life Alyx/game/hlvr/bin/linuxsteamrt64/libserver.so + 0x1405ae4)
                #3  0x00007f4e6e9b00b3 n/a (/home/im/.local/share/Steam/steamapps/common/Half-Life Alyx/game/bin/linuxsteamrt64/libengine2.so + 0x3900b3)
                #4  0x00007f4e6e8963fa n/a (/home/im/.local/share/Steam/steamapps/common/Half-Life Alyx/game/bin/linuxsteamrt64/libengine2.so + 0x2763fa)
                #5  0x00007f4e6e89cb5b n/a (/home/im/.local/share/Steam/steamapps/common/Half-Life Alyx/game/bin/linuxsteamrt64/libengine2.so + 0x27cb5b)
                #6  0x00007f4e6e8886cb n/a (/home/im/.local/share/Steam/steamapps/common/Half-Life Alyx/game/bin/linuxsteamrt64/libengine2.so + 0x2686cb)
                #7  0x00007f4e6e888ec5 n/a (/home/im/.local/share/Steam/steamapps/common/Half-Life Alyx/game/bin/linuxsteamrt64/libengine2.so + 0x268ec5)
                #8  0x00007f4e6e87b5e5 n/a (/home/im/.local/share/Steam/steamapps/common/Half-Life Alyx/game/bin/linuxsteamrt64/libengine2.so + 0x25b5e5)
                #9  0x00007f4e6e881481 n/a (/home/im/.local/share/Steam/steamapps/common/Half-Life Alyx/game/bin/linuxsteamrt64/libengine2.so + 0x261481)
                [#10](/issue/ValveSoftware/SteamVR-for-Linux/10) 0x00007f4e6e881763 n/a (/home/im/.local/share/Steam/steamapps/common/Half-Life Alyx/game/bin/linuxsteamrt64/libengine2.so + 0x261763)
                [#11](/issue/ValveSoftware/SteamVR-for-Linux/11) 0x0000564bcf04f0a0 n/a (/home/im/.local/share/Steam/steamapps/common/Half-Life Alyx/game/bin/linuxsteamrt64/hlvr + 0x10a0)
                [#12](/issue/ValveSoftware/SteamVR-for-Linux/12) 0x0000564bcf04eeae n/a (/home/im/.local/share/Steam/steamapps/common/Half-Life Alyx/game/bin/linuxsteamrt64/hlvr + 0xeae)
                [#13](/issue/ValveSoftware/SteamVR-for-Linux/13) 0x00007f4e70977042 __libc_start_main (libc.so.6 + 0x27042)
                [#14](/issue/ValveSoftware/SteamVR-for-Linux/14) 0x0000564bcf04ef65 n/a (/home/im/.local/share/Steam/steamapps/common/Half-Life Alyx/game/bin/linuxsteamrt64/hlvr + 0xf65)

Cannot upload the coredump file to github because of size limits (466M > 100M). Write me if you need it.

To Reproduce
Steps to reproduce the behavior:

1. Just start the game.

Expected behavior
Should work without crashing.

System Information (please complete the following information):

• Distribution: Fedora 32 x86_64
• SteamVR version: Beta 1.13.8
• Steam client version: Built Jun 4 2020, at 05:51:01 / package versions: 1591251555
• Opted into Steam client beta?: No
• Graphics driver version: Mesa 20.1.2 (LLVM 10.0.0), with RADV_PERFTEST=aco
• Gist for SteamVR System Information: https://gist.github.com/im-0/b9abc589039e432446e05ae5447610af
• GPU: AMD Radeon VII

Screenshots
N/A

Additional context
N/A

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