Emacs: Segfault

[T.V Raman]

This started happening yesterday on a build of emacs that has been
running happily on what is a new laptop --- build from May 30.

I updated from HEAD and rebuilt emacs; but still get the segfault.

here is what GDB shows:

run
Starting program: /usr/local/bin/emacs 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff1769640 (LWP 107662)]
[New Thread 0x7ffff0cbb640 (LWP 107663)]
[New Thread 0x7fffebfff640 (LWP 107664)]
[New Thread 0x7fffeb2a3640 (LWP 107665)]
[Detaching after vfork from child process 107668]
[Detaching after vfork from child process 107669]
[Detaching after vfork from child process 107670]
[Detaching after vfork from child process 107681]
[Detaching after vfork from child process 107682]
[New Thread 0x7fffea511640 (LWP 107683)]
[Thread 0x7fffea511640 (LWP 107683) exited]

Thread 1 "emacs" received signal SIGSEGV, Segmentation fault.
0x000055555577b798 in getc_unlocked (__fp=0x7ffff1ec670d) at 
/usr/include/x86_64-linux-gnu/bits/stdio.h:68
68        return __getc_unlocked_body (__fp);
(gdb) where 
#0  0x000055555577b798 in getc_unlocked (__fp=0x7ffff1ec670d) at 
/usr/include/x86_64-linux-gnu/bits/stdio.h:68
#1  readbyte_from_stdio () at lread.c:498
#2  0x000055555577d490 in readchar (readcharfun=0x7f20, 
multibyte=0x7fffffffb6c7) at lread.c:353
#3  0x000055555578121d in read0 (readcharfun=<optimized out>, 
locate_syms=<optimized out>) at lread.c:3683
#4  0x00005555557834f0 in read_internal_start (stream=0x7f20, start=0x0, 
end=0x0, locate_syms=<optimized out>) at lread.c:2569
#5  0x00005555557501c3 in Ffuncall (nargs=nargs@entry=2, 
args=args@entry=0x7fffffffbc60) at eval.c:2943
#6  0x0000555555783e87 in call1 (arg1=0x7f20, fn=<optimized out>) at 
/home/raman/sourceforge/emacs/src/lisp.h:3225
#7  readevalloop
    (readcharfun=0x7f20, infile0=0x7fffffffbd00, sourcename=0x55555b93dab4, 
printflag=false, unibyte=<optimized out>, readfun=0x0, start=0x0, end=0x0) at 
lread.c:2318
#8  0x000055555578498e in Fload (file=0x7ffff1f9f604, noerror=0x0, 
nomessage=0x0, nosuffix=<optimized out>, must_suffix=<optimized out>)
    at lread.c:1592
#9  0x0000555555797127 in exec_byte_code (fun=<optimized out>, 
args_template=<optimized out>, nargs=<optimized out>, args=<optimized out>)
    at bytecode.c:809
#10 0x00005555557501c3 in Ffuncall (nargs=289, args=0x7fffffffbf20) at 
eval.c:2943
#11 0x0000555555751958 in Fapply (nargs=3, args=0x7ffff1795140) at eval.c:2614
#12 0x0000555555797127 in exec_byte_code (fun=<optimized out>, 
args_template=<optimized out>, nargs=<optimized out>, args=<optimized out>)
    at bytecode.c:809
#13 0x0000555555755287 in apply_lambda (fun=0x7ffff1f49ed5, args=<optimized 
out>, count=...) at eval.c:3052
#14 0x0000555555753c9d in eval_sub (form=<optimized out>) at eval.c:2536
#15 0x0000555555783ceb in readevalloop
    (readcharfun=0x7f20, infile0=0x7fffffffd420, sourcename=0x55555b22c1f4, 
printflag=false, unibyte=<optimized out>, readfun=0x0, start=0x0, end=0x0) at 
lread.c:2338
#16 0x000055555578498e in Fload (file=0x55555b0ec5a4, noerror=0x0, 
nomessage=0x0, nosuffix=<optimized out>, must_suffix=<optimized out>)
    at lread.c:1592
#17 0x0000555555753e65 in eval_sub (form=<optimized out>) at eval.c:2460
#18 0x00005555557542ad in Fprogn (body=0x0) at eval.c:451
#19 0x0000555555753daa in eval_sub (form=<optimized out>) at eval.c:2399
#20 0x0000555555753daa in eval_sub (form=<optimized out>) at eval.c:2399
#21 0x0000555555755805 in Fprogn (body=0x555556e62ec3) at eval.c:451
#22 Flet (args=0x555556eb4c93) at eval.c:1037
#23 0x0000555555753daa in eval_sub (form=<optimized out>) at eval.c:2399
#24 0x0000555555754e65 in Fprogn (body=0x0) at eval.c:451
#25 funcall_lambda (fun=0x555556eb4d63, nargs=0, arg_vector=0x7fffffffd990) at 
eval.c:3182
#26 0x0000555555755287 in apply_lambda (fun=0x555556eb4d73, args=<optimized 
out>, count=...) at eval.c:3052
#27 0x0000555555753c9d in eval_sub (form=<optimized out>) at eval.c:2536
#28 0x0000555555754e65 in Fprogn (body=0x555556eb4663) at eval.c:451
#29 funcall_lambda (fun=0x555556eb4043, nargs=0, arg_vector=0x7fffffffdbd0) at 
eval.c:3182
#30 0x00005555557501c3 in Ffuncall (nargs=1, args=0x7fffffffdbc8) at eval.c:2943
#31 0x0000555555750289 in funcall_nil (nargs=<optimized out>, args=<optimized 
out>) at eval.c:2625
#32 0x000055555574f16c in run_hook_with_args (nargs=1, args=0x7fffffffdbc8, 
funcall=0x555555750280 <funcall_nil>) at eval.c:2802
#33 0x000055555574f3c5 in Frun_hook_with_args (args=0x7fffffffdbc8, nargs=1) at 
eval.c:2667
#34 run_hook (hook=<optimized out>) at eval.c:2815
#35 Frun_hooks (nargs=2, args=0x7ffff17950b8) at eval.c:2649
#36 0x0000555555797127 in exec_byte_code (fun=<optimized out>, 
args_template=<optimized out>, nargs=<optimized out>, args=<optimized out>)
    at bytecode.c:809
#37 0x0000555555755287 in apply_lambda (fun=0x7ffff20be1e5, args=<optimized 
out>, count=...) at eval.c:3052
#38 0x0000555555753c9d in eval_sub (form=<optimized out>) at eval.c:2536
#39 0x00005555557562b7 in Feval (form=0x7ffff25f709b, lexical=<optimized out>) 
at eval.c:2304
#40 0x000055555574ea57 in internal_condition_case
    (bfun=bfun@entry=0x5555556c4240 <top_level_2>, 
handlers=handlers@entry=0x90, hfun=hfun@entry=0x5555556cb510 <cmd_error>) at 
eval.c:1478
#41 0x00005555556c4bc6 in top_level_1 (ignore=ignore@entry=0x0) at 
keyboard.c:1157
#42 0x000055555574e9b1 in internal_catch (tag=tag@entry=0xf5d0, 
func=func@entry=0x5555556c4ba0 <top_level_1>, arg=arg@entry=0x0) at eval.c:1208
#43 0x00005555556c41bf in command_loop () at keyboard.c:1117
#44 0x00005555556cb0c3 in recursive_edit_1 () at keyboard.c:727
#45 0x00005555556cb43c in Frecursive_edit () at keyboard.c:810
#46 0x00005555555a682a in main (argc=1, argv=<optimized out>) at emacs.c:2493
(gdb) 

-- 

Thanks,

--Raman(I Search, I Find, I Misplace, I Research)
♉ Id: kg:/m/0285kf1  🦮

-- 

Thanks,

--Raman(I Search, I Find, I Misplace, I Research)
♉ Id: kg:/m/0285kf1  🦮