bug#24201: 25.1.50; TLS connections sometimes hang

[Lars Ingebrigtsen]

It seems more difficult to reproduce the bug in a non-optimised build,
but it finally happened:

#0  pthread_sigmask (how=0, newmask=<optimized out>, oldmask=0x7fffffff8a60)
    at ../sysdeps/unix/sysv/linux/pthread_sigmask.c:50
#1  0x00000000005800ec in block_interrupt_signal (oldset=0x7fffffff8a60) at 
sysdep.c:843
#2  0x00000000006898fc in really_call_select (arg=0x7fffffff8bb0) at 
thread.c:575
#3  0x00000000005e08ed in flush_stack_call_func (func=0x689853 
<really_call_select>, 
    arg=0x7fffffff8bb0) at alloc.c:5218
#4  0x000000000068999e in thread_select (func=0x7fffefb02420 <__pselect>, 
max_fds=16, 
    rfds=0x7fffffff90e0, wfds=0x7fffffff9060, efds=0x0, timeout=0x7fffffff9380, 
    sigmask=0x0) at thread.c:602
#5  0x00000000006b2ce1 in xg_select (fds_lim=16, rfds=0x7fffffff9420, 
    wfds=0x7fffffff93a0, efds=0x0, timeout=0x7fffffff9380, sigmask=0x0) at 
xgselect.c:117
#6  0x000000000065f6c5 in wait_reading_process_output (time_limit=0, 
nsecs=50000000, 
    read_kbd=0, do_display=false, wait_for_cell=XIL(0), wait_proc=0x150084d0, 
    just_wait_proc=0) at process.c:5379
#7  0x000000000065da81 in Faccept_process_output (process=XIL(0x150084d5), 
    seconds=XIL(0xd44b7f), millisec=make_number(50), just_this_one=XIL(0))
    at process.c:4667
#8  0x00000000006081b1 in funcall_subr (subr=0xc46580 <Saccept_process_output>, 
    numargs=3, args=0x7fffffff9768) at eval.c:2901
#9  0x0000000000607d46 in Ffuncall (nargs=4, args=0x7fffffff9760) at eval.c:2818
#10 0x000000000065096e in exec_byte_code (bytestr=XIL(0x43d1f04), 
vector=XIL(0x414c3a5), 
    maxdepth=make_number(7), args_template=make_number(771), nargs=3, 
    args=0x7fffffff9cb0) at bytecode.c:632
#11 0x000000000060877c in funcall_lambda (fun=XIL(0x414c3f5), nargs=3, 
    arg_vector=0x7fffffff9c98) at eval.c:3019
#12 0x0000000000607d8a in Ffuncall (nargs=4, args=0x7fffffff9c90) at eval.c:2820
#13 0x000000000065096e in exec_byte_code (bytestr=XIL(0x43d1d04), 
vector=XIL(0x42e7be5), 
    maxdepth=make_number(28), args_template=make_number(1285), nargs=5, 
    args=0x7fffffffa400) at bytecode.c:632
#14 0x000000000060877c in funcall_lambda (fun=XIL(0x414c325), nargs=5, 
    arg_vector=0x7fffffffa3d8) at eval.c:3019
#15 0x0000000000607d8a in Ffuncall (nargs=6, args=0x7fffffffa3d0) at eval.c:2820
#16 0x000000000065096e in exec_byte_code (bytestr=XIL(0x43d6684), 
vector=XIL(0x414c015), 
    maxdepth=make_number(22), args_template=make_number(1156), nargs=14, 
    args=0x7fffffffa990) at bytecode.c:632
#17 0x000000000060877c in funcall_lambda (fun=XIL(0x414c175), nargs=14, 
    arg_vector=0x7fffffffa970) at eval.c:3019
#18 0x0000000000607d8a in Ffuncall (nargs=15, args=0x7fffffffa968) at 
eval.c:2820
#19 0x000000000065096e in exec_byte_code (bytestr=XIL(0x4235df4), 
vector=XIL(0x42361a5), 
    maxdepth=make_number(15), args_template=XIL(0), nargs=0, args=0x0) at 
bytecode.c:632
#20 0x0000000000608b04 in funcall_lambda (fun=XIL(0x4235b35), nargs=1, 
    arg_vector=0x42361a5) at eval.c:3101
#21 0x0000000000607d8a in Ffuncall (nargs=2, args=0x7fffffffb088) at eval.c:2820
#22 0x000000000065096e in exec_byte_code (bytestr=XIL(0x4230074), 
vector=XIL(0x422f5b5), 
    maxdepth=make_number(4), args_template=XIL(0), nargs=0, args=0x0) at 
bytecode.c:632
#23 0x0000000000608b04 in funcall_lambda (fun=XIL(0x422f685), nargs=3, 
    arg_vector=0x422f5b5) at eval.c:3101
#24 0x0000000000607d8a in Ffuncall (nargs=4, args=0x7fffffffb5b8) at eval.c:2820
#25 0x000000000065096e in exec_byte_code (bytestr=XIL(0x42373c4), 
vector=XIL(0x4236965), 
    maxdepth=make_number(8), args_template=XIL(0), nargs=0, args=0x0) at 
bytecode.c:632
#26 0x0000000000608b04 in funcall_lambda (fun=XIL(0x4236cb5), nargs=3, 
    arg_vector=0x4236965) at eval.c:3101
#27 0x0000000000607d8a in Ffuncall (nargs=4, args=0x7fffffffbeb8) at eval.c:2820
#28 0x000000000065096e in exec_byte_code (bytestr=XIL(0x4226f24), 
vector=XIL(0x4228785), 
    maxdepth=make_number(4), args_template=XIL(0), nargs=0, args=0x0) at 
bytecode.c:632
#29 0x0000000000608b04 in funcall_lambda (fun=XIL(0x4227ee5), nargs=4, 
    arg_vector=0x4228785) at eval.c:3101
#30 0x0000000000607d8a in Ffuncall (nargs=5, args=0x7fffffffc388) at eval.c:2820
#31 0x000000000065096e in exec_byte_code (bytestr=XIL(0x422e994), 
vector=XIL(0x422db75), 
    maxdepth=make_number(5), args_template=XIL(0), nargs=0, args=0x0) at 
bytecode.c:632
#32 0x0000000000608b04 in funcall_lambda (fun=XIL(0x422dba5), nargs=4, 
    arg_vector=0x422db75) at eval.c:3101
#33 0x0000000000607d8a in Ffuncall (nargs=5, args=0x7fffffffc828) at eval.c:2820
#34 0x000000000065096e in exec_byte_code (bytestr=XIL(0x3b09454), 
vector=XIL(0x3f7ec65), 
    maxdepth=make_number(5), args_template=XIL(0), nargs=0, args=0x0) at 
bytecode.c:632
#35 0x0000000000608b04 in funcall_lambda (fun=XIL(0x3eef535), nargs=2, 
    arg_vector=0x3f7ec65) at eval.c:3101
#36 0x0000000000607d8a in Ffuncall (nargs=3, args=0x7fffffffcce8) at eval.c:2820
#37 0x000000000065096e in exec_byte_code (bytestr=XIL(0x4e49874), 
vector=XIL(0x42f70d5), 
    maxdepth=make_number(7), args_template=XIL(0), nargs=0, args=0x0) at 
bytecode.c:632
#38 0x0000000000608b04 in funcall_lambda (fun=XIL(0x42d4fd5), nargs=3, 
    arg_vector=0x42f70d5) at eval.c:3101
#39 0x0000000000607d8a in Ffuncall (nargs=4, args=0x7fffffffd2a0) at eval.c:2820
#40 0x000000000060716c in Fapply (nargs=2, args=0x7fffffffd488) at eval.c:2438
#41 0x0000000000608049 in funcall_subr (subr=0xc42a00 <Sapply>, numargs=2, 
    args=0x7fffffffd488) at eval.c:2873
#42 0x0000000000607d46 in Ffuncall (nargs=3, args=0x7fffffffd480) at eval.c:2818
#43 0x000000000065096e in exec_byte_code (bytestr=XIL(0xa6864c), 
vector=XIL(0xa6866d), 
    maxdepth=make_number(10), args_template=make_number(257), nargs=1, 
    args=0x7fffffffd9f0) at bytecode.c:632
#44 0x000000000060877c in funcall_lambda (fun=XIL(0xa6861d), nargs=1, 
    arg_vector=0x7fffffffd9e8) at eval.c:3019
#45 0x0000000000607d8a in Ffuncall (nargs=2, args=0x7fffffffd9e0) at eval.c:2820
#46 0x0000000000607744 in call1 (fn=XIL(0xc480), arg1=XIL(0x11d06665)) at 
eval.c:2669
#47 0x000000000056763e in timer_check_2 (timers=XIL(0x9cd82a3), 
    idle_timers=XIL(0x9cd82d3)) at keyboard.c:4330
#48 0x000000000056776c in timer_check () at keyboard.c:4392
#49 0x0000000000565989 in readable_events (flags=1) at keyboard.c:3349
#50 0x000000000056bed8 in get_input_pending (flags=1) at keyboard.c:6805
#51 0x00000000005723a2 in detect_input_pending_run_timers (do_display=true)
    at keyboard.c:9943
#52 0x000000000065fb9d in wait_reading_process_output (time_limit=30, nsecs=0, 
    read_kbd=-1, do_display=true, wait_for_cell=XIL(0), wait_proc=0x0, 
just_wait_proc=0)
    at process.c:5516
#53 0x0000000000425fd4 in sit_for (timeout=make_number(30), reading=true, 
    display_option=1) at dispnew.c:5804
#54 0x00000000005640ac in read_char (commandflag=1, map=XIL(0xb4357a3), 
    prev_event=XIL(0), used_mouse_menu=0x7fffffffe39f, end_time=0x0) at 
keyboard.c:2723
#55 0x0000000000570b12 in read_key_sequence (keybuf=0x7fffffffe560, bufsize=30, 
    prompt=XIL(0), dont_downcase_last=false, can_return_switch_frame=true, 
    fix_current_buffer=true, prevent_redisplay=false) at keyboard.c:9137
#56 0x0000000000560d38 in command_loop_1 () at keyboard.c:1370
#57 0x00000000006046ce in internal_condition_case (bfun=0x560902 
<command_loop_1>, 
    handlers=XIL(0x5280), hfun=0x5600b8 <cmd_error>) at eval.c:1332
#58 0x00000000005605ec in command_loop_2 (ignore=XIL(0)) at keyboard.c:1111
#59 0x0000000000603fa0 in internal_catch (tag=XIL(0xc750), 
    func=0x5605bf <command_loop_2>, arg=XIL(0)) at eval.c:1097
#60 0x000000000056058a in command_loop () at keyboard.c:1090
#61 0x000000000055fc87 in recursive_edit_1 () at keyboard.c:696
#62 0x000000000055fe0b in Frecursive_edit () at keyboard.c:767
#63 0x000000000055da7c in main (argc=1, argv=0x7fffffffea18) at emacs.c:1724

Lisp Backtrace:
"accept-process-output" (0xffff9768)
"network-stream-get-response" (0xffff9c98)
"network-stream-open-starttls" (0xffffa3d8)
"open-network-stream" (0xffffa970)
"nntp-open-connection" (0xffffb090)
"nntp-open-server" (0xffffb5c0)
"nntp-possibly-change-group" (0xffffbec0)
"nntp-with-open-group-function" (0xffffc390)
"nntp-request-article" (0xffffc830)
"gnus-request-article" (0xffffccf0)
"gnus-async-prefetch-article" (0xffffd2a8)
"apply" (0xffffd488)
"timer-event-handler" (0xffffd9e8)


-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no