Second backtrace:
(gdb) bt
#0  0x00007ffff1fcb757 in kill () at ../sysdeps/unix/syscall-template.S:82
#1  0x00000000004fea15 in abort () at emacs.c:390
#2  0x000000000055e4b1 in mark_maybe_pointer (p=<optimized out>) at alloc.c:4571
#3  mark_memory (end=<optimized out>, start=<optimized out>) at alloc.c:4656
#4  mark_stack () at alloc.c:4895
#5  Fgarbage_collect () at alloc.c:5485
#6  0x00000000005ad178 in exec_byte_code (bytestr=<optimized out>, vector=<optimized out>, maxdepth=<optimized out>, args_template=<optimized out>, nargs=nargs@entry=0, args=<optimized out>, args@entry=0x0)
    at bytecode.c:819
#7  0x0000000000575af1 in funcall_lambda (fun=39389517, nargs=nargs@entry=1, arg_vector=arg_vector@entry=0x7fffffffb4a8) at eval.c:3052
#8  0x0000000000575e0b in Ffuncall (nargs=2, args=args@entry=0x7fffffffb4a0) at eval.c:2881
#9  0x00000000005accc0 in exec_byte_code (bytestr=<optimized out>, vector=40113197, maxdepth=<optimized out>, args_template=<optimized out>, nargs=nargs@entry=0, args=<optimized out>, args@entry=0x0)
    at bytecode.c:784
#10 0x0000000000575af1 in funcall_lambda (fun=40113581, nargs=nargs@entry=4, arg_vector=arg_vector@entry=0x7fffffffb690) at eval.c:3052
#11 0x0000000000575e0b in Ffuncall (nargs=5, args=args@entry=0x7fffffffb688) at eval.c:2881
#12 0x00000000005accc0 in exec_byte_code (bytestr=<optimized out>, vector=36684005, maxdepth=<optimized out>, args_template=<optimized out>, nargs=<optimized out>, args=<optimized out>) at bytecode.c:784
#13 0x0000000000575484 in eval_sub (form=form@entry=36617366) at eval.c:2173
#14 0x00000000005781af in internal_lisp_condition_case (var=12014114, bodyform=36617366, handlers=36617030) at eval.c:1287
#15 0x00000000005ad5f3 in exec_byte_code (bytestr=<optimized out>, vector=<optimized out>, maxdepth=<optimized out>, args_template=<optimized out>, nargs=nargs@entry=0, args=<optimized out>, args@entry=0x0)
    at bytecode.c:980
#16 0x0000000000575af1 in funcall_lambda (fun=36661557, nargs=nargs@entry=4, arg_vector=arg_vector@entry=0x7fffffffbbf0) at eval.c:3052
#17 0x0000000000575e0b in Ffuncall (nargs=5, args=args@entry=0x7fffffffbbe8) at eval.c:2881
#18 0x00000000005accc0 in exec_byte_code (bytestr=<optimized out>, vector=37027173, maxdepth=<optimized out>, args_template=<optimized out>, nargs=nargs@entry=0, args=<optimized out>, args@entry=0x0)
    at bytecode.c:784
#19 0x0000000000575af1 in funcall_lambda (fun=37027549, nargs=nargs@entry=2, arg_vector=arg_vector@entry=0x7fffffffbdd0) at eval.c:3052
#20 0x0000000000575e0b in Ffuncall (nargs=3, args=args@entry=0x7fffffffbdc8) at eval.c:2881
#21 0x00000000005accc0 in exec_byte_code (bytestr=<optimized out>, vector=37539117, maxdepth=<optimized out>, args_template=<optimized out>, nargs=nargs@entry=0, args=<optimized out>, args@entry=0x0)
    at bytecode.c:784
#22 0x0000000000575af1 in funcall_lambda (fun=37565189, nargs=nargs@entry=2, arg_vector=arg_vector@entry=0x7fffffffbfe0) at eval.c:3052
#23 0x0000000000575e0b in Ffuncall (nargs=3, args=args@entry=0x7fffffffbfd8) at eval.c:2881
#24 0x00000000005accc0 in exec_byte_code (bytestr=<optimized out>, vector=39241109, maxdepth=<optimized out>, args_template=<optimized out>, nargs=nargs@entry=0, args=<optimized out>, args@entry=0x0)
    at bytecode.c:784
#25 0x0000000000575af1 in funcall_lambda (fun=39241565, nargs=nargs@entry=4, arg_vector=arg_vector@entry=0x7fffffffc1d0) at eval.c:3052
#26 0x0000000000575e0b in Ffuncall (nargs=5, args=args@entry=0x7fffffffc1c8) at eval.c:2881
#27 0x00000000005accc0 in exec_byte_code (bytestr=<optimized out>, vector=39241725, maxdepth=<optimized out>, args_template=<optimized out>, nargs=nargs@entry=0, args=<optimized out>, args@entry=0x0)
    at bytecode.c:784
#28 0x0000000000575af1 in funcall_lambda (fun=39241789, nargs=nargs@entry=1, arg_vector=arg_vector@entry=0x7fffffffc3a0) at eval.c:3052
#29 0x0000000000575e0b in Ffuncall (nargs=2, args=args@entry=0x7fffffffc398) at eval.c:2881
#30 0x00000000005accc0 in exec_byte_code (bytestr=<optimized out>, vector=39261117, maxdepth=<optimized out>, args_template=<optimized out>, nargs=nargs@entry=0, args=<optimized out>, args@entry=0x0)
    at bytecode.c:784
#31 0x0000000000575af1 in funcall_lambda (fun=39261389, nargs=nargs@entry=3, arg_vector=arg_vector@entry=0x7fffffffc590) at eval.c:3052
#32 0x0000000000575e0b in Ffuncall (nargs=4, args=args@entry=0x7fffffffc588) at eval.c:2881
#33 0x00000000005accc0 in exec_byte_code (bytestr=<optimized out>, vector=39260693, maxdepth=<optimized out>, args_template=<optimized out>, nargs=nargs@entry=0, args=<optimized out>, args@entry=0x0)
    at bytecode.c:784
#34 0x0000000000575af1 in funcall_lambda (fun=39260957, nargs=nargs@entry=0, arg_vector=arg_vector@entry=0x7fffffffc770) at eval.c:3052
#35 0x0000000000575e0b in Ffuncall (nargs=1, args=args@entry=0x7fffffffc768) at eval.c:2881
#36 0x00000000005accc0 in exec_byte_code (bytestr=<optimized out>, vector=39240637, maxdepth=<optimized out>, args_template=<optimized out>, nargs=nargs@entry=0, args=<optimized out>, args@entry=0x0)
    at bytecode.c:784
#37 0x0000000000575af1 in funcall_lambda (fun=39240965, nargs=nargs@entry=0, arg_vector=arg_vector@entry=0x7fffffffc9a8) at eval.c:3052
#38 0x0000000000575e0b in Ffuncall (nargs=1, args=0x7fffffffc9a0) at eval.c:2881
#39 0x00000000005762c9 in funcall_nil (nargs=<optimized out>, args=<optimized out>) at eval.c:2337
#40 0x00000000005748c5 in run_hook_with_args (nargs=1, args=0x7fffffffc9a0, funcall=0x5762c0 <funcall_nil>) at eval.c:2526
#41 0x0000000000574a86 in Frun_hooks (nargs=1, args=0x7fffffffcb68) at eval.c:2364
#42 0x000000000057601c in Ffuncall (nargs=nargs@entry=2, args=args@entry=0x7fffffffcb60) at eval.c:2802
#43 0x0000000000576f9f in Fapply (nargs=2, args=0x7fffffffcb60) at eval.c:2272
#44 0x000000000057601c in Ffuncall (nargs=<optimized out>, args=args@entry=0x7fffffffcb58) at eval.c:2802
#45 0x00000000005accc0 in exec_byte_code (bytestr=<optimized out>, vector=29036341, maxdepth=<optimized out>, args_template=<optimized out>, nargs=nargs@entry=0, args=<optimized out>, args@entry=0x0)
    at bytecode.c:784
#46 0x0000000000575af1 in funcall_lambda (fun=21265109, nargs=nargs@entry=1, arg_vector=arg_vector@entry=0x7fffffffcd20) at eval.c:3052
#47 0x0000000000575e0b in Ffuncall (nargs=2, args=args@entry=0x7fffffffcd18) at eval.c:2881
#48 0x00000000005accc0 in exec_byte_code (bytestr=<optimized out>, vector=37332285, maxdepth=<optimized out>, args_template=<optimized out>, nargs=nargs@entry=0, args=<optimized out>, args@entry=0x0)
    at bytecode.c:784
#49 0x0000000000575af1 in funcall_lambda (fun=37332909, nargs=nargs@entry=1, arg_vector=arg_vector@entry=0x7fffffffcef0) at eval.c:3052
#50 0x0000000000575e0b in Ffuncall (nargs=2, args=args@entry=0x7fffffffcee8) at eval.c:2881
#51 0x00000000005accc0 in exec_byte_code (bytestr=<optimized out>, vector=37362885, maxdepth=<optimized out>, args_template=<optimized out>, nargs=nargs@entry=0, args=<optimized out>, args@entry=0x0)
    at bytecode.c:784
#52 0x0000000000575af1 in funcall_lambda (fun=37363141, nargs=nargs@entry=3, arg_vector=arg_vector@entry=0x7fffffffd0e0) at eval.c:3052
#53 0x0000000000575e0b in Ffuncall (nargs=4, args=args@entry=0x7fffffffd0d8) at eval.c:2881
---Type <return> to continue, or q <return> to quit---
#54 0x00000000005accc0 in exec_byte_code (bytestr=<optimized out>, vector=37366093, maxdepth=<optimized out>, args_template=<optimized out>, nargs=nargs@entry=0, args=<optimized out>, args@entry=0x0)
    at bytecode.c:784
#55 0x0000000000575af1 in funcall_lambda (fun=37366437, nargs=nargs@entry=5, arg_vector=arg_vector@entry=0x7fffffffd2e0) at eval.c:3052
#56 0x0000000000575e0b in Ffuncall (nargs=6, args=args@entry=0x7fffffffd2d8) at eval.c:2881
#57 0x00000000005accc0 in exec_byte_code (bytestr=<optimized out>, vector=37365517, maxdepth=<optimized out>, args_template=<optimized out>, nargs=nargs@entry=0, args=<optimized out>, args@entry=0x0)
    at bytecode.c:784
#58 0x0000000000575af1 in funcall_lambda (fun=37366029, nargs=nargs@entry=2, arg_vector=arg_vector@entry=0x7fffffffd4c0) at eval.c:3052
#59 0x0000000000575e0b in Ffuncall (nargs=3, args=args@entry=0x7fffffffd4b8) at eval.c:2881
#60 0x00000000005accc0 in exec_byte_code (bytestr=<optimized out>, vector=37366485, maxdepth=<optimized out>, args_template=<optimized out>, nargs=nargs@entry=0, args=<optimized out>, args@entry=0x0)
    at bytecode.c:784
#61 0x0000000000575af1 in funcall_lambda (fun=37366629, nargs=nargs@entry=0, arg_vector=arg_vector@entry=0x7fffffffd6a0) at eval.c:3052
#62 0x0000000000575e0b in Ffuncall (nargs=nargs@entry=1, args=args@entry=0x7fffffffd698) at eval.c:2881
#63 0x0000000000576327 in apply1 (fn=fn@entry=36351522, arg=arg@entry=12014114) at eval.c:2556
#64 0x0000000000571efd in Fcall_interactively (function=36351522, record_flag=12014114, keys=12049333) at callint.c:378
#65 0x0000000000575f97 in Ffuncall (nargs=nargs@entry=4, args=args@entry=0x7fffffffd840) at eval.c:2827
#66 0x00000000005761d4 in call3 (fn=<optimized out>, arg1=<optimized out>, arg2=<optimized out>, arg3=<optimized out>) at eval.c:2620
#67 0x00000000004ff98d in Fcommand_execute (cmd=<optimized out>, record_flag=<optimized out>, keys=<optimized out>, special=<optimized out>) at keyboard.c:10342
#68 0x000000000050effb in command_loop_1 () at keyboard.c:1573
#69 0x00000000005743d3 in internal_condition_case (bfun=bfun@entry=0x50ec70 <command_loop_1>, handlers=12065890, hfun=hfun@entry=0x503b50 <cmd_error>) at eval.c:1333
#70 0x0000000000501f8e in command_loop_2 (ignore=ignore@entry=12014114) at keyboard.c:1155
#71 0x00000000005742cb in internal_catch (tag=<error reading variable: Cannot access memory at address 0x1f20>, func=func@entry=0x501f70 <command_loop_2>, arg=12014114) at eval.c:1090
#72 0x0000000000503647 in command_loop () at keyboard.c:1134
#73 recursive_edit_1 () at keyboard.c:754
#74 0x000000000050396a in Frecursive_edit () at keyboard.c:818
#75 0x00000000004187bd in main (argc=1, argv=<optimized out>) at emacs.c:1693