Zed CPU usage uncapped when parsing complex regular expressions; freezes computer

[Bertie690]

Reproduction steps

Catastrophic backtracking is very easy to do for those new to regular expressions.
Unfortunately, it can also crash your PC in a matter of seconds.
While Zed's regex engine is a lot more performant than its competitors, it too can be brought to its knees and turned into a WOMD for your CPU.

I had hoped Zed would handle this in a semi-reasonable way (maybe giving an error message, maybe force closing itself once above a certain CPU level).
Instead, it proceeded to consume all my remaining CPU and render me incapable of closing the application.

Reproduction steps:

1. Obtain a large file of some sort. Here's my TS file of choice.
2. Create a regular expression complicated enough to make Zed cry. Here's mine: export .* (?<className>\w*) ((?:(?!\k<className>).|\n)*\k<className>){4,5} (For the record, that was supposed to be 1,2 but i hit a row too high on the numpad)
3. Watch Zed overheat and crash.hile

Current vs. Expected behavior

Expected:
Some fallbacks should exist for continuously high editor CPU usage during regexes, like VS Code's prompt to close or reload the window.

Actual:
No fallback mechanisms means CPU usage is free to spike all the way up to 90% and freeze my system.

Zed version and system specs

Zed: v0.214.7 (Zed)
OS: Windows 10.0.26100
Memory: 15.2 GiB
Architecture: x86_64
GPU: AMD Radeon(TM) Graphics || AMD Corporation || 25.11.1 (25.10.33.03-251106a-420894C-AMD-Software-Adrenalin-Edition)

If applicable, attach your Zed log file to this issue

Zed.log + Minidumps

Miniprof zip archive

Logs (of dubious quality, it's all just saying "uploaded miniprof")

2025-11-29T17:28:42-05:00 ERROR [remote::remote_client] (remote server) server:error handling message. type:BlameBuffer, error:unknown buffer id 30064772770
2025-11-29T17:28:43-05:00 ERROR [remote::remote_client] (remote server) server:error handling message. type:OpenBufferByPath, error:Could not open path: assets
2025-11-29T17:28:43-05:00 ERROR [remote::remote_client] (remote server) server:error handling message. type:OpenBufferByPath, error:Could not open path: locales
2025-11-29T17:28:43-05:00 ERROR [crates/git_ui/src/project_diff.rs:585] RPC request OpenBufferByPath failed: Could not open path: assets
2025-11-29T17:28:43-05:00 ERROR [crates/git_ui/src/project_diff.rs:585] RPC request OpenBufferByPath failed: Could not open path: locales
2025-11-29T17:28:44-05:00 ERROR [remote::remote_client] (remote server) server:error handling message. type:OpenBufferByPath, error:Could not open path: assets
2025-11-29T17:28:44-05:00 ERROR [remote::remote_client] (remote server) server:error handling message. type:OpenBufferByPath, error:Could not open path: locales
2025-11-29T17:28:44-05:00 ERROR [crates/git_ui/src/project_diff.rs:585] RPC request OpenBufferByPath failed: Could not open path: assets
2025-11-29T17:28:44-05:00 ERROR [crates/git_ui/src/project_diff.rs:585] RPC request OpenBufferByPath failed: Could not open path: locales
2025-11-29T17:29:04-05:00 ERROR [remote::remote_client] (remote server) server:error handling message. type:OpenBufferByPath, error:Could not open path: assets
2025-11-29T17:29:04-05:00 ERROR [remote::remote_client] (remote server) server:error handling message. type:OpenBufferByPath, error:Could not open path: locales
2025-11-29T17:29:04-05:00 ERROR [crates/git_ui/src/project_diff.rs:585] RPC request OpenBufferByPath failed: Could not open path: assets
2025-11-29T17:29:04-05:00 ERROR [crates/git_ui/src/project_diff.rs:585] RPC request OpenBufferByPath failed: Could not open path: locales
2025-11-29T17:29:04-05:00 ERROR [remote::remote_client] (remote server) server:error handling message. type:OpenBufferByPath, error:Could not open path: locales
2025-11-29T17:29:04-05:00 ERROR [remote::remote_client] (remote server) server:error handling message. type:OpenBufferByPath, error:Could not open path: assets
2025-11-29T17:29:04-05:00 ERROR [crates/git_ui/src/project_diff.rs:585] RPC request OpenBufferByPath failed: Could not open path: assets
2025-11-29T17:29:04-05:00 ERROR [crates/git_ui/src/project_diff.rs:585] RPC request OpenBufferByPath failed: Could not open path: locales
2025-11-29T17:29:04-05:00 ERROR [remote::remote_client] (remote server) server:error handling message. type:OpenBufferByPath, error:Could not open path: assets
2025-11-29T17:29:04-05:00 ERROR [remote::remote_client] (remote server) server:error handling message. type:OpenBufferByPath, error:Could not open path: locales
2025-11-29T17:29:04-05:00 ERROR [crates/git_ui/src/project_diff.rs:585] RPC request OpenBufferByPath failed: Could not open path: assets
2025-11-29T17:29:04-05:00 ERROR [crates/git_ui/src/project_diff.rs:585] RPC request OpenBufferByPath failed: Could not open path: locales
2025-11-29T17:29:06-05:00 ERROR [remote::remote_client] (remote server) server:error handling message. type:OpenBufferByPath, error:Could not open path: assets
2025-11-29T17:29:06-05:00 ERROR [remote::remote_client] (remote server) server:error handling message. type:OpenBufferByPath, error:Could not open path: locales
2025-11-29T17:29:06-05:00 ERROR [crates/git_ui/src/project_diff.rs:585] RPC request OpenBufferByPath failed: Could not open path: assets
2025-11-29T17:29:06-05:00 ERROR [crates/git_ui/src/project_diff.rs:585] RPC request OpenBufferByPath failed: Could not open path: locales
2025-11-29T17:30:40-05:00 INFO  [editor] Ignoring repeated FindAllReferences invocation with the position of already running task
2025-11-29T17:31:32-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-31-31.miniprof
2025-11-29T17:31:34-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-31-31.miniprof
2025-11-29T17:31:36-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-31-31.miniprof
2025-11-29T17:31:38-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-31-31.miniprof
2025-11-29T17:31:40-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-31-31.miniprof
2025-11-29T17:31:45-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-31-31.miniprof
2025-11-29T17:32:14-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-32-13.miniprof
2025-11-29T17:32:22-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-32-13.miniprof
2025-11-29T17:32:25-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-32-13.miniprof
2025-11-29T17:32:32-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-32-13.miniprof
2025-11-29T17:32:32-05:00 ERROR [crates/client/src/telemetry.rs:577] error sending request for url (https://api.zed.dev/telemetry/events?)

Caused by:
    0: client error (Connect)
    1: operation timed out
2025-11-29T17:32:36-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-32-13.miniprof
2025-11-29T17:32:39-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-32-13.miniprof
2025-11-29T17:32:43-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-32-13.miniprof
2025-11-29T17:32:47-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-32-13.miniprof
2025-11-29T17:32:51-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-32-13.miniprof
2025-11-29T17:32:59-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-32-13.miniprof
2025-11-29T17:33:03-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-32-13.miniprof
2025-11-29T17:33:07-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-32-13.miniprof
2025-11-29T17:33:10-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-32-13.miniprof
2025-11-29T17:33:14-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-32-13.miniprof
2025-11-29T17:33:18-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-32-13.miniprof
2025-11-29T17:33:22-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-32-13.miniprof
2025-11-29T17:33:25-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-32-13.miniprof
2025-11-29T17:34:48-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-32-13.miniprof
2025-11-29T17:34:52-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-32-13.miniprof
2025-11-29T17:34:55-05:00 WARN  [remote::remote_client] No heartbeat from server after 5s. Missed heartbeat 1 out of 5.
2025-11-29T17:34:56-05:00 INFO  [remote::remote_client] setting state to 'heartbeat missed'
2025-11-29T17:34:56-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-32-13.miniprof
2025-11-29T17:35:06-05:00 WARN  [remote::remote_client] No heartbeat from server after 5s. Missed heartbeat 2 out of 5.
2025-11-29T17:35:06-05:00 INFO  [remote::remote_client] setting state to 'heartbeat missed'
2025-11-29T17:35:19-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-35-15.miniprof
2025-11-29T17:35:42-05:00 WARN  [remote::remote_client] No heartbeat from server after 5s. Missed heartbeat 3 out of 5.
2025-11-29T17:35:50-05:00 INFO  [remote::remote_client] setting state to 'heartbeat missed'
2025-11-29T17:35:52-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-35-15.miniprof
2025-11-29T17:36:04-05:00 WARN  [remote::remote_client] No heartbeat from server after 5s. Missed heartbeat 4 out of 5.
2025-11-29T17:36:04-05:00 INFO  [remote::remote_client] setting state to 'heartbeat missed'
2025-11-29T17:36:08-05:00 INFO  [gpui::platform::windows::events] System settings changed: ImmersiveColorSet
2025-11-29T17:36:18-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-17.miniprof
2025-11-29T17:36:20-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-17.miniprof
2025-11-29T17:36:22-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-17.miniprof
2025-11-29T17:36:24-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-17.miniprof
2025-11-29T17:36:25-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-17.miniprof
2025-11-29T17:36:27-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-17.miniprof
2025-11-29T17:36:29-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-17.miniprof
2025-11-29T17:36:35-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-17.miniprof
2025-11-29T17:36:37-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-17.miniprof
2025-11-29T17:36:39-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-17.miniprof
2025-11-29T17:36:39-05:00 INFO  [gpui::platform::windows::events] System settings changed: ImmersiveColorSet
2025-11-29T17:36:41-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-17.miniprof
2025-11-29T17:36:53-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-52.miniprof
2025-11-29T17:36:53-05:00 WARN  [remote::remote_client] No heartbeat from server after 5s. Missed heartbeat 5 out of 5.
2025-11-29T17:36:53-05:00 INFO  [remote::remote_client] setting state to 'heartbeat missed'
2025-11-29T17:36:53-05:00 ERROR [remote::remote_client] Missed last 5 heartbeats. Reconnecting...
2025-11-29T17:36:53-05:00 INFO  [remote::remote_client] setting state to 'reconnecting'
2025-11-29T17:36:53-05:00 INFO  [remote::remote_client] Trying to reconnect to ssh server... Attempt 1
2025-11-29T17:36:59-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-59.miniprof
2025-11-29T17:37:01-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-59.miniprof
2025-11-29T17:37:03-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-59.miniprof
2025-11-29T17:37:05-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-59.miniprof
2025-11-29T17:37:07-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-59.miniprof
2025-11-29T17:37:09-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-59.miniprof
2025-11-29T17:37:11-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-59.miniprof
2025-11-29T17:37:13-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-59.miniprof
2025-11-29T17:37:15-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-59.miniprof
2025-11-29T17:37:17-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-59.miniprof
2025-11-29T17:37:18-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-59.miniprof
2025-11-29T17:37:20-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-59.miniprof
2025-11-29T17:37:22-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-59.miniprof
2025-11-29T17:37:24-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-59.miniprof
2025-11-29T17:37:26-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-59.miniprof
2025-11-29T17:37:28-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-59.miniprof
2025-11-29T17:37:30-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-36-59.miniprof
2025-11-29T17:37:30-05:00 INFO  [gpui::platform::windows::events] System settings changed: ImmersiveColorSet
2025-11-29T17:37:36-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-37-35.miniprof
2025-11-29T17:37:36-05:00 INFO  [gpui::platform::windows::events] System settings changed: ImmersiveColorSet
2025-11-29T17:37:38-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-37-35.miniprof
2025-11-29T17:37:40-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-37-35.miniprof
2025-11-29T17:37:41-05:00 ERROR [remote::remote_client] Reconnect attempt 1 failed: Timed out resyncing remote client. Starting new attempt...
2025-11-29T17:37:41-05:00 INFO  [remote::remote_client] setting state to 'reconnecting'
2025-11-29T17:37:41-05:00 INFO  [remote::remote_client] Trying to reconnect to ssh server... Attempt 2
2025-11-29T17:37:42-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-37-35.miniprof
2025-11-29T17:37:49-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-37-48.miniprof
2025-11-29T17:37:54-05:00 ERROR [remote::remote_client] Reconnect attempt 2 failed: Timed out resyncing remote client. Starting new attempt...
2025-11-29T17:37:54-05:00 INFO  [remote::remote_client] setting state to 'reconnecting'
2025-11-29T17:37:54-05:00 INFO  [remote::remote_client] Trying to reconnect to ssh server... Attempt 3
2025-11-29T17:38:01-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-38-01.miniprof
2025-11-29T17:38:09-05:00 ERROR [remote::remote_client] Reconnect attempt 3 failed: Timed out resyncing remote client. Starting new attempt...
2025-11-29T17:38:09-05:00 ERROR [remote::remote_client] Failed to reconnect to after 3 attempts, giving up
2025-11-29T17:38:09-05:00 INFO  [remote::remote_client] setting state to 'reconnect exhausted'
2025-11-29T17:38:15-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-38-14.miniprof
2025-11-29T17:38:17-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-38-14.miniprof
2025-11-29T17:38:19-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-38-14.miniprof
2025-11-29T17:38:21-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-38-14.miniprof
2025-11-29T17:38:24-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-38-14.miniprof
2025-11-29T17:38:27-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-38-14.miniprof
2025-11-29T17:38:29-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-38-14.miniprof
2025-11-29T17:38:30-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-38-14.miniprof
2025-11-29T17:38:33-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-38-14.miniprof
2025-11-29T17:38:34-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-38-14.miniprof
2025-11-29T17:38:36-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-38-14.miniprof
2025-11-29T17:38:38-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-38-14.miniprof
2025-11-29T17:38:40-05:00 INFO  [zed::reliability] hang detected, trace file saved at: C:\Users\taylo\AppData\Local\Zed\hang_traces\hang-2025-11-29_17-38-14.miniprof

(there's like 200 more lines of solely miniprof dumps after this before i shut off my PC)

NB: I can reproduce this reliably on my system, and have done so several times with similar regexes.

[miguelraz]

Thanks for the detailed reproduction steps and additional file!

Hmmm - I can't reproduce that hangup with your file and on Windows or Linux.

Was this perhaps of an active project with an LSP going that could interfere with the perf here?

[miguelraz]

There's clearly a hang in the UI detected here so I'm escalating this.

[ConradIrwin]

@Bertie690 We use the fancy_regex crate for search. Most regular expressions are matched in linear time (c.f. https://swtch.com/~rsc/regexp/regexp1.html).

That said, for expressions where linear-time matching is currently not believed to be possible (back-references for sure are in this category) it falls back to an exponential runtime.

can you show a screenshot of VSCode's error handling here? We could maybe do something similar (or just put a warning under the search bar: "Your regex is slow, KISS ;)").

Also are you able to upload a few of those mini dump files? Hopefully we can figure out what's going on there – regex matching should be on a background thread.

[Bertie690]

Alrighty - I have around 30 from me repeatly crashing my laptop to make sure it wasn't a fluke.
Will upload shortly.
(I will say you guys do a lot better than vs code - that thing keels over and dies for (a+a+)+b in a big file of as)

[Bertie690]

Hmmm - I can't reproduce that hangup with your file and on Windows or Linux.

I noticed your screenshot had regex mode off - did you test with it on?
If so, my laptop's poor specs might play a factor - this potato has only 16gb of RAM, 2.8GHz of clock speed and an integrated GPU that loves to overheat my computer.

Was this perhaps of an active project with an LSP going that could interfere with the perf here?

I doubt it - copying the aforementioned big-ass file to another directory (one without any of the symbols that could be tracked by tsgo) produced a similar series of slowdowns.