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bug#19860: Acknowledgement (25.0.50; One url-retrieve-synchronously call


From: Dmitry Gutov
Subject: bug#19860: Acknowledgement (25.0.50; One url-retrieve-synchronously call running concurrently with another can freeze it)
Date: Mon, 16 Feb 2015 00:19:23 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:36.0) Gecko/20100101 Thunderbird/36.0

With debug-on-quit, pressing C-g during the wait yields:

Debugger entered--Lisp error: (quit)
(condition-case nil (let ((inhibit-quit nil)) (accept-process-output proc)) (quit (setq quit-flag t) (eval (quote (ignore nil))))) (or (condition-case nil (let ((inhibit-quit nil)) (accept-process-output proc)) (quit (setq quit-flag t) (eval (quote (ignore nil))))) (null proc)) (if (or (condition-case nil (let ((inhibit-quit nil)) (accept-process-output proc)) (quit (setq quit-flag t) (eval (quote (ignore nil))))) (null proc)) nil (if quit-flag (progn (delete-process proc))) (setq proc (and (not quit-flag) (get-buffer-process asynch-buffer)))) (if (buffer-local-value (quote url-redirect-buffer) asynch-buffer) (setq proc (get-buffer-process (setq asynch-buffer (buffer-local-value (quote url-redirect-buffer) asynch-buffer)))) (if (and proc (memq (process-status proc) (quote (closed exit signal failed))) (eq proc (or (get-buffer-process asynch-buffer) proc))) (progn (delete-process proc) (setq retrieval-done t))) (if (or (condition-case nil (let ((inhibit-quit nil)) (accept-process-output proc)) (quit (setq quit-flag t) (eval (quote (ignore nil))))) (null proc)) nil (if quit-flag (progn (delete-process proc))) (setq proc (and (not quit-flag) (get-buffer-process asynch-buffer))))) (while (not retrieval-done) (url-debug (quote retrieval) "Spinning in url-retrieve-synchronously: %S (%S)" retrieval-done asynch-buffer) (if (buffer-local-value (quote url-redirect-buffer) asynch-buffer) (setq proc (get-buffer-process (setq asynch-buffer (buffer-local-value (quote url-redirect-buffer) asynch-buffer)))) (if (and proc (memq (process-status proc) (quote (closed exit signal failed))) (eq proc (or (get-buffer-process asynch-buffer) proc))) (progn (delete-process proc) (setq retrieval-done t))) (if (or (condition-case nil (let ((inhibit-quit nil)) (accept-process-output proc)) (quit (setq quit-flag t) (eval (quote ...)))) (null proc)) nil (if quit-flag (progn (delete-process proc))) (setq proc (and (not quit-flag) (get-buffer-process asynch-buffer)))))) (let ((proc (get-buffer-process asynch-buffer))) (while (not retrieval-done) (url-debug (quote retrieval) "Spinning in url-retrieve-synchronously: %S (%S)" retrieval-done asynch-buffer) (if (buffer-local-value (quote url-redirect-buffer) asynch-buffer) (setq proc (get-buffer-process (setq asynch-buffer (buffer-local-value (quote url-redirect-buffer) asynch-buffer)))) (if (and proc (memq (process-status proc) (quote (closed exit signal failed))) (eq proc (or (get-buffer-process asynch-buffer) proc))) (progn (delete-process proc) (setq retrieval-done t))) (if (or (condition-case nil (let (...) (accept-process-output proc)) (quit (setq quit-flag t) (eval ...))) (null proc)) nil (if quit-flag (progn (delete-process proc))) (setq proc (and (not quit-flag) (get-buffer-process asynch-buffer))))))) (if (null asynch-buffer) nil (let ((proc (get-buffer-process asynch-buffer))) (while (not retrieval-done) (url-debug (quote retrieval) "Spinning in url-retrieve-synchronously: %S (%S)" retrieval-done asynch-buffer) (if (buffer-local-value (quote url-redirect-buffer) asynch-buffer) (setq proc (get-buffer-process (setq asynch-buffer (buffer-local-value ... asynch-buffer)))) (if (and proc (memq (process-status proc) (quote ...)) (eq proc (or ... proc))) (progn (delete-process proc) (setq retrieval-done t))) (if (or (condition-case nil (let ... ...) (quit ... ...)) (null proc)) nil (if quit-flag (progn (delete-process proc))) (setq proc (and (not quit-flag) (get-buffer-process asynch-buffer))))))) asynch-buffer) (let ((retrieval-done nil) (asynch-buffer nil)) (setq asynch-buffer (url-retrieve url (function (lambda (&rest ignored) (url-debug (quote retrieval) "Synchronous fetching done (%S)" (current-buffer)) (setq retrieval-done t asynch-buffer (current-buffer)))) nil silent inhibit-cookies)) (if (null asynch-buffer) nil (let ((proc (get-buffer-process asynch-buffer))) (while (not retrieval-done) (url-debug (quote retrieval) "Spinning in url-retrieve-synchronously: %S (%S)" retrieval-done asynch-buffer) (if (buffer-local-value (quote url-redirect-buffer) asynch-buffer) (setq proc (get-buffer-process (setq asynch-buffer ...))) (if (and proc (memq ... ...) (eq proc ...)) (progn (delete-process proc) (setq retrieval-done t))) (if (or (condition-case nil ... ...) (null proc)) nil (if quit-flag (progn ...)) (setq proc (and ... ...)))))) asynch-buffer))
  url-retrieve-synchronously("http://xip.io";)
  long-outer-op()
  long-ops-now()





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