GNU bug report logs - #15075
24.3.50; Infinite loop when closing some connections

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Lars Magne Ingebrigtsen <larsi <at> gnus.org>
Subject: bug#15075: closed (Re: trunk r113824: * process.c (deactivate_process):
 Reset fds to -1.)
Date: Tue, 13 Aug 2013 02:45:03 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#15075: 24.3.50; Infinite loop when closing some connections

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 15075 <at> debbugs.gnu.org.

-- 
15075: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=15075
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Lars Magne Ingebrigtsen <larsi <at> gnus.org>
Cc: 15075-done <at> debbugs.gnu.org
Subject: Re: trunk r113824: * process.c (deactivate_process): Reset fds to -1.
Date: Mon, 12 Aug 2013 19:44:03 -0700

Lars Magne Ingebrigtsen wrote:
> Does this fix bug#15075, too?

Yes, I think trunk bzr 113824 should also fix
bug#15075.  I'll CC: this to 15075 <at> debbugs.gnu.org
to give them a heads up.  I'm taking the liberty of
closing that bug; if I'm wrong, please reopen it or
let me know and I'll reopen it.

[Message part 3 (message/rfc822, inline)]

From: Lars Magne Ingebrigtsen <larsi <at> gnus.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3.50; Infinite loop when closing some connections
Date: Mon, 12 Aug 2013 14:36:33 +0200

When reading (via tls) from pop3, Emacs hangs hard upon closing the
connection.

strace says:

[pid 18991] read(17, 0x7fff4c6ac3f0, 4096) = -1 EBADF (Bad file descriptor)
[pid 18991] read(17, 0x7fff4c6ac3f0, 4096) = -1 EBADF (Bad file descriptor)
[pid 18991] read(17, 0x7fff4c6ac3f0, 4096) = -1 EBADF (Bad file descriptor)
[pid 18991] read(17, 0x7fff4c6ac3f0, 4096) = -1 EBADF (Bad file descriptor)
[pid 18991] read(17, 0x7fff4c6ac3f0, 4096) = -1 EBADF (Bad file descriptor)
[pid 18991] read(17, 0x7fff4c6ac3f0, 4096) = -1 EBADF (Bad file descriptor)
[pid 18991] read(17, 0x7fff4c6ac3f0, 4096) = -1 EBADF (Bad file descriptor)
[pid 18991] read(17, 0x7fff4c6ac3f0, 4096) = -1 EBADF (Bad file descriptor)
[pid 18991] read(17, 0x7fff4c6ac3f0, 4096) = -1 EBADF (Bad file descriptor)

/proc shows that fd 17 no longer exists, so it's probably been closed by
Emacs, and we're then inflooping in a read on that socket, for some
reason,

The last checkin is:

fixes bug: http://debbugs.gnu.org/15035
committer: Paul Eggert <eggert <at> cs.ucla.edu>
branch nick: trunk
timestamp: Mon 2013-08-12 00:12:07 -0700
message:
  Fix some fd issues when running subprocesses.

So that seems like a likely candidate.  :-)

Here's the gdb backtrace:

#0  0x00007ffff2f4718d in read () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000004e5086 in read (__nbytes=4096, __buf=0x7fffffffa340, __fd=21) at /usr/include/x86_64-linux-gnu/bits/unistd.h:45
#2  emacs_read (fildes=fildes <at> entry=21, buf=0x7fffffffa340 "+OK Logging out, messages deleted.\r\n", nbyte=4096) at sysdep.c:2300
#3  0x0000000000577820 in read_process_output (proc=proc <at> entry=26878253, channel=21) at process.c:4980
#4  0x000000000057c548 in wait_reading_process_output (time_limit=<optimized out>, nsecs=-1, read_kbd=read_kbd <at> entry=0, 
    do_display=do_display <at> entry=false, wait_for_cell=11969090, wait_proc=0x19a2128, just_wait_proc=0) at process.c:4435
#5  0x000000000057d541 in Faccept_process_output (process=26878253, seconds=<optimized out>, millisec=<optimized out>, 
    just_this_one=<optimized out>) at process.c:3948
#6  0x000000000053fb44 in Ffuncall (nargs=<optimized out>, args=<optimized out>) at eval.c:2864
#7  0x0000000000573b7b in exec_byte_code (bytestr=-9, vector=140737488331584, maxdepth=4096, args_template=140737488337176, 
    nargs=4611686018662268928, args=0x400000003f000000) at bytecode.c:905
#8  0x000000000053f5f1 in funcall_lambda (fun=25388357, nargs=nargs <at> entry=1, arg_vector=arg_vector <at> entry=0x7fffffffbaa0) at eval.c:3087
#9  0x000000000053f953 in Ffuncall (nargs=2, args=0x7fffffffba98) at eval.c:2914
#10 0x0000000000573b7b in exec_byte_code (bytestr=-9, vector=140737488331584, maxdepth=4096, args_template=0, nargs=4611686018662268928, 
    args=0x400000003f000000) at bytecode.c:905




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-- 
(domestic pets only, the antidote for overdose, milk.)
  No Gnus T-Shirt for sale: http://ingebrigtsen.no/no.php
  and http://lars.ingebrigtsen.no/2013/08/twenty-years-of-september.html

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