Error running timer ‘explain--measure-timer-callback’: (args-out-of-range [] 0) Root cause: `explain-pause-top--table-refresh` called on first load with one entry already

[Grekkor]

I run into the following error when running explain-pause-top.
I am not that experienced with debugging emacs so I hope this is sufficient. If not please tell me how I can further assist.
I am running the latest Spacemacs develop on emacs 28.0.50 an using explain-pause-mode d18eea7

Error during redisplay: ((closure ((this-buffer . #<buffer *explain-pause-top*>) explain-pause-top-mode-abbrev-table explain-pause-top-mode-syntax-table cl-struct-explain-pause-top--command-entry-tags cl-struct-explain-pause-top--table-display-entry-tags cl-struct-explain-pause-top--table-tags t) (_) (explain-pause-top--buffer-update-width-from-windows this-buffer)) #<frame emacs@PC16-176 0x55b7451d0190>) signaled (args-out-of-range [] 0) [2 times]
Error running timer ‘explain--measure-timer-callback’: (args-out-of-range [] 0)
Emacs was slow 6 times recently. Run ‘explain-pause-top’ or check ‘*explain-pause-log*’ to learn more.
Error running timer ‘explain--measure-timer-callback’: (args-out-of-range [] 0) [20 times]

[Grekkor]

I also just had this:

Fri Jun 12 16:32:53 2020 - 3007042 ms (read-wait 43 ms) - explain-pause-top--buffer-refresh-with-buffer, timer, explain-pause-top--buffer-refresh-with-buffer, timer, explain-pause-top--buffer-refresh-with-buffer, timer, explain-pause-top--buffer-refresh-with-buffer, timer, explain-pause-top--buffer-refresh-with-buffer, timer, explain-pause-top--buffer-refresh-with-buffer, timer, explain-pause-top--buffer-refresh-with-buffer, timer, explain-pause-top--buffer-refresh-with-buffer, timer, explain-pause-top--buffer-refresh-with-buffer, timer, explain-pause-top--buffer-refresh-with-buffer, timer, explain-pause-top--buffer-refresh-with-buffer, timer, explain-pause-top--buffer-refresh-with-buffer, timer, explain-pause-top--buffer-refresh-with-buffer, timer, explain-pause-top--buffer-refresh-with-buffer, timer, explain-pause-top--buffer-refresh-with-buffer, timer, explain-pause-top--buffer-refresh-with-buffer, timer, explain-pause-top--buffer-refresh-with-buffer, timer, 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(minibuffer-inactive-mode)]

[lastquestion]

Hi!

Thanks for the bug report and thanks for running bleeding edge software :-) I really appreciate it and taking the time out to file an issue. Hopefully your emacs was still usable enough to save buffers and quit!

Looks like there are 3 bugs here:

1. The super long time 3007042ms in explain-pause-top--buffer-... is because the debugger broke while it was trying to draw, and you were copying and pasting the stack trace. :-) explain-pause was correct to log that out, but it's not useful. Issue Adjust exclusion list for profiling and reporting #9 talks about this, and in particular debug actions need to be excluded so we don't count humans debugging (stack trace, backtrace, step, etc).
2. But! The log made me realize that there is a very bad performance issue in the way the timer code works, which will lead to exhaustion of memory and terrible GC. I have opened another issue to track that, because it's not related to the actual out of bounds error you hit. Handle recursive timers so their command stacks do not grow infinitely #41
3. The actual bug. I think it's related to display when the size is 0 or the buffer is somehow not set up right. Could you describe more about what your setup is? You're running emacs in UI, right? Do you remember if you had the explain-pause-top window open in a separate frame, or it was minimized and then opened, for example, or if you maybe buried the buffer or something like this? Oh, do you remember if you had a sort specified like maybe sort on command name as opposed to the default sort?

Ultimately I have a guess about where this bug is but I'm not sure, some help with what was happening at the time it crashed would be really useful :-)

[lastquestion]

I haven't tried running this on 28, actually, yet. I will try to do this weekend.

[lastquestion]

Hi, while testing #42 I discovered a possible "bug like" thing in Emacs, which lead to a call stack trace very similar to this. In particular, when you leave focus from Emacs (like you tab away to another app) at least on MacOSX, this causes the timers to start firing once every 10 seconds or so, which then causes updates for repeated timers to bunch up, which could cause the log message you pasted. This happens in Emacs 28 as well as 26.

I am going to try to figure out if that above is an Emacs bug or on purpose.

What OS are you on?

[yantar92]

Same bug here. More detailed backtrace:

Debugger entered--Lisp error: (args-out-of-range [] 0)
  (explain-pause-top--command-entry-compare nil #s(explain-pause-top--command-entry :command-set ("from mini-buffer (``)" helm-M-x) :count 1 :slow-count 0 :avg-ms 12 :total-ms 12 :dirty new) [])
  (explain-pause-top--table-prepare-draw #s(explain-pause-top--table-display-entry :begin-mark nil :item-ptr #s(explain-pause-top--command-entry :command-set ("from mini-buffer (``)" helm-M-x) :count 1 :slow-count 0 :avg-ms 12 :total-ms 12 :dirty new) :prev-state nil :total-length nil :dirty-columns #&0"" :cached-strings [] :cached-string-lengths []) [7 5 6 2 5] [])
  (explain-pause-top--table-refresh #s(explain-pause-top--table :entries (nil #s(explain-pause-top--command-entry :command-set ("from mini-buffer (``)" helm-M-x) :count 1 :slow-count 0 :avg-ms 12 :total-ms 12 :dirty new) #s(explain-pause-top--command-entry :command-set (helm-match-line-cleanup timer) :count 1 :slow-count 0 :avg-ms 0 :total-ms 0 :dirty new) #s(explain-pause-top--command-entry :command-set (#f(compiled-function () #<bytecode 0x14e2be2c0d24e237>) idle-timer) :count 1 :slow-count 0 :avg-ms 0 :total-ms 0 :dirty new) #s(explain-pause-top--command-entry :command-set (blink-cursor-start idle-timer) :count 1 :slow-count 0 :avg-ms 0 :total-ms 0 :dirty new) #s(explain-pause-top--command-entry :command-set (which-key--update idle-timer) :count 1 :slow-count 0 :avg-ms 0 :total-ms 0 :dirty new) #s(explain-pause-top--command-entry :command-set (blink-cursor-timer-function timer) :count 2 :slow-count 0 :avg-ms 0.0 :total-ms 0 :dirty t) #s(explain-pause-top--command-entry :command-set (auto-revert-buffers timer) :count 1 :slow-count 0 :avg-ms 1 :total-ms 1 :dirty new)) :display-entries (nil) :sorter #f(compiled-function (lhs rhs) #<bytecode 0xab2948feb15608>) :width 164 :needs-resize t :column-widths nil :header-widths [7 5 6 2 5] :header-titles ["Command" #("slow▼" 0 5 (face explain-pause-top-active-column-header)) "avg ms" "ms" "calls"] :header-dirty t :display-full-line-format nil :display-column-formats nil :display-column-offsets nil))
  (explain-pause-top--buffer-refresh)
  (explain-pause-top--buffer-refresh-with-buffer #<buffer *explain-pause-top*>)
  (apply explain-pause-top--buffer-refresh-with-buffer #<buffer *explain-pause-top*>)
  (explain--measure-function explain-pause-top--buffer-refresh-with-buffer (#<buffer *explain-pause-top*>) (explain-pause-top--buffer-refresh-with-buffer timer) explain-pause-log-all-timers)
  (explain--measure-timer-callback explain-pause-top--buffer-refresh-with-buffer #<buffer *explain-pause-top*>)
  (apply explain--measure-timer-callback (explain-pause-top--buffer-refresh-with-buffer #<buffer *explain-pause-top*>))
  (timer-event-handler [t 24294 48731 202827 2 explain--measure-timer-callback (explain-pause-top--buffer-refresh-with-buffer #<buffer *explain-pause-top*>) nil 878000])

[lastquestion]

Thank you @yantar92!!! I see what is wrong, let me fix this now against master, and then backport this to #42.

[lastquestion]

I also replicate this on 28.x (latest master of emacs).

[lastquestion]

Repro case: need to insert an entry in between the call to display-buffer and the eventual resize called from the hook window-size-change-functions -> explain-pause-top--buffer-update-width-from-windows.

Looks like that gets called from run_window_change_functions which is called from redisplay_internal. Seems pretty reasonable that timers could run in between - classic race condition.