pyls with Emacs lsp mode load cpu to 100%

[FabriceSalvaire]

Using Emacs https://github.com/emacs-lsp/lsp-mode

I noticed it hangs too often to be usable, and the pyls process load the cpu to 100%.

I don't know how to debug that.

[ccordoba12]

Hey @FabriceSalvaire, thanks for reporting. Please provide a simple code example and use case that generates this problem. Otherwise, we won't be able to reproduce it on our side.

[FabriceSalvaire]

Is there a way to trace what is going on ? I tried to look the Emacs lsp mode logging, but I don't have enough information.

Notice, it is not always easy for a user to make a docker image that reproduce a bug.

[ccordoba12]

Please check the options of pylsp --help to see how to get the logs generated by the server.

[compyman]

I have been experiencing the same thing for quite a while as well - I haven't been able to get lsp-mode to start pylsp with any other arguments (specifically '--verbose'). However I turned on IO logging and it looks like it's submitting a bunch of requests (one on every keypress?) for signature help (section of log below)

it then tries to cancel the previous request - however I get the following in the pylsp::stderr buffer

2022-09-09 15:57:52,238 EDT - WARNING - pylsp_jsonrpc.endpoint - Received cancel notification for unknown message id 2010
2022-09-09 15:57:52,518 EDT - WARNING - pylsp_jsonrpc.endpoint - Received cancel notification for unknown message id 2020

and then pylsp gets so caught up in fulfilling all these requests that it uses my entire CPU???

``` [Trace - 03:57:50 PM] Sending request 'textDocument/signatureHelp - (2010)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 39 } } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2011)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 39 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2011 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2012)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 39 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2012 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2013)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 39 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2013 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2014)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 39 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2014 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2015)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 39 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2015 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2016)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 39 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2016 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2017)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 39 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2017 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2018)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 39 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2018 } [Trace - 03:57:50 PM] Sending notification 'textDocument/didChange'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py", "version": 290 }, "contentChanges": [ { "range": { "start": { "line": 330, "character": 39 }, "end": { "line": 330, "character": 39 } }, "rangeLength": 0, "text": "i" } ] } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2010 } [Trace - 03:57:50 PM] Sending request 'textDocument/signatureHelp - (2019)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 40 } } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2020)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 40 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2020 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2021)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 40 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2021 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2022)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 40 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2022 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2023)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 40 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2023 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2024)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 40 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2024 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2025)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 40 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2025 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2026)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 40 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2026 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2027)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 40 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2027 } [Trace - 03:57:50 PM] Sending notification 'textDocument/didChange'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py", "version": 291 }, "contentChanges": [ { "range": { "start": { "line": 330, "character": 40 }, "end": { "line": 330, "character": 40 } }, "rangeLength": 0, "text": "m" } ] } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2019 } [Trace - 03:57:50 PM] Sending request 'textDocument/signatureHelp - (2028)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 41 } } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2029)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 41 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Received response 'nil - (2010)' in 0ms. Result: { "signatures": [ { "label": "celery_decorator(name: str, time_limit: int, ignore_result: bool=True, **kwargs: Any) -> Callable[[Callable[..., Any]], celery.Task]", "documentation": "", "parameters": [ { "label": "name", "documentation": null }, { "label": "time_limit", "documentation": null }, { "label": "ignore_result", "documentation": null }, { "label": "kwargs", "documentation": null } ] } ], "activeSignature": 0, "activeParameter": 1 } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2029 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2030)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 41 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2030 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2031)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 41 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2031 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2032)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 41 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2032 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2033)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 41 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2033 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2034)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 41 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2034 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2035)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 41 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2035 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2036)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 41 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2036 } [Trace - 03:57:50 PM] Sending notification 'textDocument/didChange'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py", "version": 292 }, "contentChanges": [ { "range": { "start": { "line": 330, "character": 41 }, "end": { "line": 330, "character": 41 } }, "rangeLength": 0, "text": "e" } ] } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2028 } [Trace - 03:57:50 PM] Sending request 'textDocument/signatureHelp - (2037)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 42 } } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2038)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 42 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Received response 'nil - (2011)' in 0ms. Result: { "isIncomplete": null, "items": [ { "label": "TabError", "kind": 7, "sortText": "aTabError", "insertText": "TabError($0)", "insertTextFormat": 2, "data": { "doc_uri": "file:///home/nate/wave/remit-srv/src/search.py" } }, { "label": "time_limit=", "kind": 6, "sortText": "atime_limit=", "insertText": "time_limit=", "data": { "doc_uri": "file:///home/nate/wave/remit-srv/src/search.py" } }, { "label": "TimeoutError", "kind": 7, "sortText": "aTimeoutError", "insertText": "TimeoutError", "data": { "doc_uri": "file:///home/nate/wave/remit-srv/src/search.py" } }, { "label": "Transaction", "kind": 7, "sortText": "aTransaction", "insertText": "Transaction(${1:args}, ${2:kwargs})$0", "insertTextFormat": 2, "data": { "doc_uri": "file:///home/nate/wave/remit-srv/src/search.py" } }, { "label": "True", "kind": 14, "sortText": "aTrue", "insertText": "True", "data": { "doc_uri": "file:///home/nate/wave/remit-srv/src/search.py" } }, { "label": "tuple", "kind": 7, "sortText": "atuple", "insertText": "tuple()", "data": { "doc_uri": "file:///home/nate/wave/remit-srv/src/search.py" } }, { "label": "type", "kind": 7, "sortText": "atype", "insertText": "type($0)", "insertTextFormat": 2, "data": { "doc_uri": "file:///home/nate/wave/remit-srv/src/search.py" } }, { "label": "TypeError", "kind": 7, "sortText": "aTypeError", "insertText": "TypeError", "data": { "doc_uri": "file:///home/nate/wave/remit-srv/src/search.py" } }, { "label": "TabError object", "kind": 25, "sortText": "aTabError", "insertText": "TabError", "data": { "doc_uri": "file:///home/nate/wave/remit-srv/src/search.py" } }, { "label": "TimeoutError object", "kind": 25, "sortText": "aTimeoutError", "insertText": "TimeoutError", "data": { "doc_uri": "file:///home/nate/wave/remit-srv/src/search.py" } }, { "label": "Transaction object", "kind": 25, "sortText": "aTransaction", "insertText": "Transaction", "data": { "doc_uri": "file:///home/nate/wave/remit-srv/src/search.py" } }, { "label": "tuple object", "kind": 25, "sortText": "atuple", "insertText": "tuple", "data": { "doc_uri": "file:///home/nate/wave/remit-srv/src/search.py" } }, { "label": "type object", "kind": 25, "sortText": "atype", "insertText": "type", "data": { "doc_uri": "file:///home/nate/wave/remit-srv/src/search.py" } }, { "label": "TypeError object", "kind": 25, "sortText": "aTypeError", "insertText": "TypeError", "data": { "doc_uri": "file:///home/nate/wave/remit-srv/src/search.py" } } ] } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2038 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2039)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 42 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2039 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2040)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 42 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2040 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2041)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 42 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2041 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2042)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 42 }, "context": { "triggerKind": 1 } } [Trace - 03:57:50 PM] Sending notification '$/cancelRequest'. Params: { "id": 2042 } [Trace - 03:57:50 PM] Sending request 'textDocument/completion - (2043)'. Params: { "textDocument": { "uri": "file:///home/nate/wave/remit-srv/src/search.py" }, "position": { "line": 330, "character": 42 }, "context": { "triggerKind": 1 } } ```

[ccordoba12]

This server doesn't support cancelRequest, so that should be the problem.

[compyman]

ah that's quite a bummer - is that something that could be in scope for the server? or is there a technical/design reason not to include it? As is with my (admittedly pretty large) project, it's mostly not usable :/.

[compyman]

@ccordoba12 just checking - do you think it'd be possible to add cancel Request support (maybe as a PR?) or technically is that not feasible in the implementation? If someone was interested in adding that support do you have any tips for how to get started?

[ccordoba12]

I think that requires moving the server to use asyncio. Unfortunately, we don't have the resources to do it at the moment.

[mwip]

I am facing the same issue. I noticed it happens when scrolling through the lsp-ui-doc buffer.

[gtnbssn]

I am experiencing something very similar with neovim, maybe this is not an emacs only issue?

When i start working on my project (a very small one: i am teaching myself python doing advent of code puzzles) the lsp log gets flooded with messages similar to what @compyman found out:

...
[ERROR][2022-12-04 16:06:20] .../vim/lsp/rpc.lua:733    "rpc"   "pylsp" "stderr"    "2022-12-04 16:06:20,770 +08 - WARNING - pylsp_jsonrpc.endpoint - Received cancel notification for unknown message id 2070\n"
...

I see i have one CPU at 100%, and in neovim, the lsp is acting up: diagnostics are out of date, not showing correctly, i get time outs when trying to format, etc.

After a while, the messages stop showing up in my log (unless i am typing) and things go back to normal.

Or is it a neovim issue?

[stsquad]

Can you strace the hanging process? In my case it seems pylsp has decided to try and index all my build directories (which are under the source tree) of everything - including object files. No wonder it hangs:

newfstatat(AT_FDCWD, "/home/alex/lsrc/qemu.git/builds/bisect/libcommon.fa.p/hw_net_can_can_kvaser_pci.c.o", {st_mode=S_IFREG|0644, st_size=68768, ...}, 0) = 0
newfstatat(AT_FDCWD, "/home/alex/lsrc/qemu.git/builds/bisect/libcommon.fa.p/hw_net_can_can_kvaser_pci.c.o", {st_mode=S_IFREG|0644, st_size=68768, ...}, 0) = 0
newfstatat(AT_FDCWD, "/home/alex/lsrc/qemu.git/builds/bisect/libcommon.fa.p/hw_intc_arm_gicv3_its.c.o", {st_mode=S_IFREG|0644, st_size=348968, ...}, 0) = 0
newfstatat(AT_FDCWD, "/home/alex/lsrc/qemu.git/builds/bisect/libcommon.fa.p/hw_intc_arm_gicv3_its.c.o", {st_mode=S_IFREG|0644, st_size=348968, ...}, 0) = 0
newfstatat(AT_FDCWD, "/home/alex/lsrc/qemu.git/builds/bisect/libcommon.fa.p/hw_intc_arm_gicv3_its.c.o", {st_mode=S_IFREG|0644, st_size=348968, ...}, AT_SYMLINK_NOFOLLOW) = 0
newfstatat(AT_FDCWD, "/home/alex/lsrc/qemu.git/builds/bisect/libcommon.fa.p/hw_intc_arm_gicv3_its.c.o", {st_mode=S_IFREG|0644, st_size=348968, ...}, 0) = 0
newfstatat(AT_FDCWD, "/home/alex/lsrc/qemu.git/builds/bisect/libcommon.fa.p/hw_intc_arm_gicv3_its.c.o", {st_mode=S_IFREG|0644, st_size=348968, ...}, 0) = 0
newfstatat(AT_FDCWD, "/home/alex/lsrc/qemu.git/builds/bisect/libcommon.fa.p/hw_arm_exynos4_boards.c.o", {st_mode=S_IFREG|0644, st_size=104248, ...}, 0) = 0
newfstatat(AT_FDCWD, "/home/alex/lsrc/qemu.git/builds/bisect/libcommon.fa.p/hw_arm_exynos4_boards.c.o", {st_mode=S_IFREG|0644, st_size=104248, ...}, 0) = 0
newfstatat(AT_FDCWD, "/home/alex/lsrc/qemu.git/builds/bisect/libcommon.fa.p/hw_arm_exynos4_boards.c.o", {st_mode=S_IFREG|0644, st_size=104248, ...}, AT_SYMLINK_NOFOLLOW) = 0
newfstatat(AT_FDCWD, "/home/alex/lsrc/qemu.git/builds/bisect/libcommon.fa.p/hw_arm_exynos4_boards.c.o", {st_mode=S_IFREG|0644, st_size=104248, ...}, 0) = 0
newfstatat(AT_FDCWD, "/home/alex/lsrc/qemu.git/builds/bisect/libcommon.fa.p/hw_arm_exynos4_boards.c.o", {st_mode=S_IFREG|0644, st_size=104248, ...}, 0) = 0
newfstatat(AT_FDCWD, "/home/alex/lsrc/qemu.git/builds/bisect/libcommon.fa.p/ui_x_keymap.c.o", {st_mode=S_IFREG|0644, st_size=51392, ...}, 0) = 0
newfstatat(AT_FDCWD, "/home/alex/lsrc/qemu.git/builds/bisect/libcommon.fa.p/ui_x_keymap.c.o", {st_mode=S_IFREG|0644, st_size=51392, ...}, 0) = 0
newfstatat(AT_FDCWD, "/home/alex/lsrc/qemu.git/builds/bisect/libcommon.fa.p/ui_x_keymap.c.o", {st_mode=S_IFREG|0644, st_size=51392, ...}, AT_SYMLINK_NOFOLLOW) = 0
newfstatat(AT_FDCWD, "/home/alex/lsrc/qemu.git/builds/bisect/libcommon.fa.p/ui_x_keymap.c.o", {st_mode=S_IFREG|0644, st_size=51392, ...}, 0) = 0
newfstatat(AT_FDCWD, "/home/alex/lsrc/qemu.git/builds/bisect/libcommon.fa.p/ui_x_keymap.c.o", {st_mode=S_IFREG|0644, st_size=51392, ...}, 0) = 0
newfstatat(AT_FDCWD, "/home/alex/lsrc/qemu.git/builds/bisect/libcommon.fa.p/hw_acpi_ghes.c.o", {st_mode=S_IFREG|0644, st_size=53728, ...}, 0) = 0
newfstatat(AT_FDCWD, "/home/alex/lsrc/qemu.git/builds/bisect/libcommon.fa.p/hw_acpi_ghes.c.o", {st_mode=S_IFREG|0644, st_size=53728, ...}, 0) = 0
newfstatat(AT_FDCWD, "/home/alex/lsrc/qemu.git/builds/bisect/libcommon.fa.p/hw_acpi_ghes.c.o", {st_mode=S_IFREG|0644, st_size=53728, ...}, AT_SYMLINK_NOFOLLOW) = 0

[stsquad]

I managed to get a backtrace with gdb/py-bt:

(gdb) py-bt                                                                                                                                                          [32/875]
Traceback (most recent call first):                                                   
  File "/usr/lib/python3/dist-packages/rope/base/resources.py", line 258, in does_match
    if pattern.match(resource.path):                                                  
  File "/usr/lib/python3/dist-packages/rope/base/project.py", line 280, in is_ignored
    return self.ignored.does_match(resource)                                                                                                                                 
  File "/usr/lib/python3/dist-packages/rope/base/resources.py", line 180, in get_children
    if not self.project.is_ignored(child):                                            
  File "/usr/lib/python3/dist-packages/rope/base/resources.py", line 216, in get_files 
    resource for resource in self.get_children() if not resource.is_folder()   
  File "/usr/lib/python3/dist-packages/rope/base/pycore.py", line 153, in _find_source_folders
    for resource in folder.get_files():                                               
  File "/usr/lib/python3/dist-packages/rope/base/pycore.py", line 158, in _find_source_folders
    result.extend(self._find_source_folders(resource))                                                                                                                       
  File "/usr/lib/python3/dist-packages/rope/base/pycore.py", line 158, in _find_source_folders
    result.extend(self._find_source_folders(resource))                                                                                                                       
  File "/usr/lib/python3/dist-packages/rope/base/pycore.py", line 158, in _find_source_folders
    result.extend(self._find_source_folders(resource))                                                                                                                       
  File "/usr/lib/python3/dist-packages/rope/base/project.py", line 84, in get_source_folders
    result.extend(self.pycore._find_source_folders(self.root))                                                                                                               
  File "/usr/lib/python3/dist-packages/rope/base/project.py", line 145, in find_module 
    for src in self.get_source_folders():                                                                                                                                    
  File "/usr/lib/python3/dist-packages/rope/refactor/importutils/actions.py", line 52, in _get_relative_to_absolute_list
    resource = self.project.find_module(name, folder=self.folder)                   
  File "/usr/lib/python3/dist-packages/rope/refactor/importutils/actions.py", line 33, in visitNormalImport
    self.to_be_absolute.extend(self._get_relative_to_absolute_list(import_info))
  File "/usr/lib/python3/dist-packages/rope/refactor/importutils/actions.py", line 11, in dispatch
    return method(import_, import_.import_info)                                                                                                                              
  File "/usr/lib/python3/dist-packages/rope/refactor/importutils/importinfo.py", line 61, in accept
    return visitor.dispatch(self)                                                     
  File "/usr/lib/python3/dist-packages/rope/refactor/importutils/module_imports.py", line 270, in get_relative_to_absolute_list
    import_stmt.accept(visitor)                                                       
  File "/usr/lib/python3/dist-packages/rope/refactor/importutils/__init__.py", line 174, in relatives_to_absolutes
    module_imports.get_relative_to_absolute_list()
  File "/usr/lib/python3/dist-packages/rope/refactor/move.py", line 795, in moving_code_with_imports
    source = import_tools.relatives_to_absolutes(pymodule)
  File "/usr/lib/python3/dist-packages/rope/refactor/inline.py", line 110, in _init_imports
    body, imports = move.moving_code_with_imports(self.project, self.resource, body)
  File "/usr/lib/python3/dist-packages/rope/refactor/inline.py", line 106, in __init__ 
    self._init_imports()
  File "/usr/lib/python3/dist-packages/rope/refactor/inline.py", line 74, in create_inline
    return InlineMethod(project, resource, offset)
  File "/usr/lib/python3/dist-packages/pylsp_rope/refactoring.py", line 212, in validate
    inline.create_inline(
  File "/usr/lib/python3/dist-packages/pylsp_rope/refactoring.py", line 53, in is_valid
    self.validate(info)
  File "/usr/lib/python3/dist-packages/pylsp_rope/plugin.py", line 132, in <listcomp>
    if cmd.is_valid(info)
  File "/usr/lib/python3/dist-packages/pylsp_rope/plugin.py", line 129, in pylsp_code_actions
    return [
  File "/usr/lib/python3/dist-packages/pluggy/_callers.py", line 39, in _multicall
    res = hook_impl.function(*args)
  File "/usr/lib/python3/dist-packages/pluggy/_manager.py", line 324, in <lambda>
    lambda: oldcall(hook_name, hook_impls, kwargs, firstresult)
  File "/usr/lib/python3/dist-packages/pluggy/_result.py", line 33, in from_call
    result = func()
  File "/usr/lib/python3/dist-packages/pluggy/_manager.py", line 323, in traced_hookexec
    outcome = _Result.from_call(
  File "/usr/lib/python3/dist-packages/pylsp/config/config.py", line 33, in _hookexec
    return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
  File "/usr/lib/python3/dist-packages/pluggy/_hooks.py", line 265, in __call__
    return self._hookexec(self.name, self.get_hookimpls(), kwargs, firstresult)
  File "/usr/lib/python3/dist-packages/pylsp/python_lsp.py", line 233, in _hook
    return hook_handlers(config=self.config, workspace=workspace, document=doc, **kwargs)
  File "/usr/lib/python3/dist-packages/pylsp/python_lsp.py", line 332, in code_actions 
    return flatten(self._hook('pylsp_code_actions', doc_uri, range=range, context=context))
  File "/usr/lib/python3/dist-packages/pylsp/python_lsp.py", line 426, in m_text_document__code_action
    return self.code_actions(textDocument['uri'], range, context)
  File "/usr/lib/python3/dist-packages/pylsp_jsonrpc/dispatchers.py", line 25, in handler
    return method(**(params or {}))
  File "/usr/lib/python3/dist-packages/pylsp_jsonrpc/endpoint.py", line 185, in _handle_request
    handler_result = handler(params)
  File "/usr/lib/python3/dist-packages/pylsp_jsonrpc/endpoint.py", line 116, in consume
    self._handle_request(message['id'], message['method'], message.get('params'))
  File "/usr/lib/python3/dist-packages/pylsp_jsonrpc/streams.py", line 40, in listen
    message_consumer(json.loads(request_str.decode('utf-8')))
  File "/usr/lib/python3/dist-packages/pylsp/python_lsp.py", line 186, in start
    self._jsonrpc_stream_reader.listen(self._endpoint.consume)
  File "/usr/lib/python3/dist-packages/pylsp/python_lsp.py", line 92, in start_io_lang_server
    server.start()
  File "/usr/lib/python3/dist-packages/pylsp/__main__.py", line 84, in main
    start_io_lang_server(stdin, stdout, args.check_parent_process,
  File "/usr/bin/pylsp", line 8, in <module>
    sys.exit(main())

So it looks like the underlying problem is with rope?