unexpected panic under load

while the host system was under heavy load, i encountered a panic. while i've lost the exact output, i noted the following:

• nothing was printed before or after the panic
• panicked at common/src/node.rs:77:25
• 'no entry found for key'

(found while trying to reproduce some unexpected behaviour when killed by OOM)

Environment

• CPU: Intel i7-8650U
• GPU: Intel UHD 620 (integrated)
• Memory: 6.5/7.3 GiB used
• Swap: ~4/7.3 GiB used after OOM
• Arch Linux, kernel 6.18.7.arch1-1
• Sway (Wayland)

Steps taken before crash

• write a client.toml config file containing only save = "/tmp/aaaa". no other config files present
• /tmp/aaaa does not exist prior to launching the game
• launch the game
• open many firefox tabs, including a youtube video
• start flying around ingame
• youtube video starts playing
• the panic occured about a second afterwards

Reproduction

i have been unable to reproduce this crash for ~15m of trying.

Start by inspecting common/src/node.rs:77:25 and determine which lookup can produce the reported “no entry found for key” panic. Review how the game handles the client.toml save path and memory pressure, then try to reproduce the crash under similar load. Done means the panic is understood and the relevant failure is handled or covered by a regression test.