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bug#33135: 27.0.50; (make-thread) TRAMP interactive freeze macOS 10.14


From: Christian Johansson
Subject: bug#33135: 27.0.50; (make-thread) TRAMP interactive freeze macOS 10.14
Date: Tue, 6 Nov 2018 18:50:30 +0100

I was wrong, interactive threaded tramp over ange-ftp on macos doesn’t work. I have got more crashes lately after I updated branch, not sure if errors help but here are some:


 ;; Opening remote file 
emacs(16737,0x700004306000) malloc: *** error for object 0x11cb50885: pointer being freed was not allocated emacs(16737,0x111d105c0) malloc: *** error for object 0x7ffeefbfb610: pointer being freed was not allocated emacs(16737,0x700004306000) malloc: *** set a breakpoint in malloc_error_break to debug emacs(16737,0x111d105c0) malloc: *** set a breakpoint in malloc_error_break to debug Fatal error 6: Abort trapAbort trap: 6 logout Saving session... ...saving history...truncating history files... ...completed.

;; Renaming file over SSH via tramp 
objc[40791]: Invalid or prematurely-freed autorelease pool 0x10200b1c0. Fatal error 6: Abort trapAbort trap: 6 

 ;; another local sudo
emacs(41111,0x70000c892000) malloc: *** error for object 0x70000d093530: pointer being freed was not allocated emacs(41111,0x70000c892000) malloc: *** set a breakpoint in malloc_error_break to debug Fatal error 4: Illegal instructionAbort trap: 6 

;; another remote dired over SSH
emacs(40323,0x1181f95c0) malloc: *** error for object 0x103337305: pointer being freed was not allocated emacs(40323,0x1181f95c0) malloc: *** set a breakpoint in malloc_error_break to debug

5 nov. 2018 kl. 16:39 skrev Christian Johansson <address@hidden>:

Alright, I’ll see if I can get the error again. I only got it like 2 times in 8 hours so it’s not frequent.

I tried user-interaction via threaded ange-ftp  tramp on macOS and it seems to work on your branch. I will try it a bit more this week.

Regards
Christian

5 nov. 2018 kl. 14:49 skrev Michael Albinus <address@hidden>:

Christian Johansson <address@hidden> writes:

Hi Michael

Hi Christian,

I haven't experienced a single crash since I started using your
threaded tramp branch but I sometimes get errors like this, but it
doesn't make Emacs crash, I can just retry same operation and it will
work. It seems like sometimes a thread is busy and Emacs tries to
access it in some way and this error occurs, I have replaced sensitive
information with --- below

Debugger entered--Lisp error: (error "Attempt to accept output from
process *ftp ---...")
 accept-process-output(#<process *ftp address@hidden>)
 ange-ftp-wait-not-busy(#<process *ftp address@hidden>)
 ange-ftp-raw-send-cmd(#<process *ftp address@hidden> "type ascii" nil
(#f(compiled-function (result line host user cmd msg cont nowait)
#<bytecode 0x4ffee879>) "---" "---" "type ascii" nil nil nil) nil)

Looks like the ange-ftp process is not assigned to the proper thread. As
said, ange-ftp is a special case, it wasn't handled yet.

I've pushed a fix to the feature/tramp-thread-safe branch; should work
now. Could you pls retest?

I haven't tried threaded tramp that requires user-interaction yet
though since I got ~/.authinfo.gpg working with ange-ftp, I'll see if
I can test that this week

Likely, this won't work. Nobody has provided a fix for this problem, yet.

Regards
Christian

Best regards, Michael.

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