#0  0x000000000058879c in terminate_due_to_signal (sig=6, backtrace_limit=2147483647) at emacs.c:363
#1  0x000000000061dbf4 in die (msg=0x74e3fd "STRINGP (a)", file=0x74e330 "lisp.h", line=1276) at alloc.c:7339
#2  0x0000000000582dfd in XSTRING (a=...) at lisp.h:1276
#3  0x0000000000582e44 in SDATA (string=...) at lisp.h:1327
#4  0x000000000069f953 in Faccept_process_output (process=..., seconds=..., millisec=..., just_this_one=...) at process.c:4566
#5  0x00000000006430f7 in funcall_subr (subr=0xd74628 <Saccept_process_output>, numargs=3, args=0x7fffe5987f10) at eval.c:2826
#6  0x0000000000642bda in Ffuncall (nargs=4, args=0x7fffe5987f08) at eval.c:2743
#7  0x0000000000691dd2 in exec_byte_code (bytestr=..., vector=..., maxdepth=..., args_template=..., nargs=0, args=0x0) at bytecode.c:641
#8  0x0000000000643cb9 in funcall_lambda (fun=..., nargs=1, arg_vector=0x577f1f5)
    at eval.c:3021
#9  0x0000000000642c0e in Ffuncall (nargs=2, args=0x7fffe5988638) at eval.c:2745
#10 0x0000000000691dd2 in exec_byte_code (bytestr=..., vector=..., maxdepth=..., args_template=..., nargs=0, args=0x0) at bytecode.c:641
#11 0x0000000000643cb9 in funcall_lambda (fun=..., nargs=1, arg_vector=0x58b7325)
    at eval.c:3021
#12 0x0000000000642c0e in Ffuncall (nargs=2, args=0x7fffe5988e58) at eval.c:2745
#13 0x0000000000691dd2 in exec_byte_code (bytestr=..., vector=..., maxdepth=..., args_template=..., nargs=0, args=0x0) at bytecode.c:641
#14 0x0000000000643cb9 in funcall_lambda (fun=..., nargs=1, arg_vector=0x58b71ed)
    at eval.c:3021
#15 0x0000000000642c0e in Ffuncall (nargs=2, args=0x7fffe5989558) at eval.c:2745
#16 0x0000000000691dd2 in exec_byte_code (bytestr=..., vector=..., maxdepth=..., args_template=..., nargs=0, args=0x0) at bytecode.c:641
#17 0x0000000000643cb9 in funcall_lambda (fun=..., nargs=3, arg_vector=0x58b713d)
    at eval.c:3021
#18 0x0000000000642c0e in Ffuncall (nargs=4, args=0x7fffe5989ca8) at eval.c:2745
#19 0x0000000000691dd2 in exec_byte_code (bytestr=..., vector=..., maxdepth=..., args_template=..., nargs=0, args=0x0) at bytecode.c:641
#20 0x0000000000643cb9 in funcall_lambda (fun=..., nargs=2, arg_vector=0x58b6d9d)
    at eval.c:3021
#21 0x0000000000643418 in apply_lambda (fun=..., args=..., count=22) at eval.c:2880
#22 0x00000000006416da in eval_sub (form=...) at eval.c:2264
#23 0x000000000063c0c3 in Fif (args=...) at eval.c:403
#24 0x0000000000641126 in eval_sub (form=...) at eval.c:2172
#25 0x000000000063ee5d in internal_lisp_condition_case (var=..., bodyform=..., handlers=...) at eval.c:1295
#26 0x000000000063e912 in Fcondition_case (args=...) at eval.c:1221
#27 0x0000000000641126 in eval_sub (form=...) at eval.c:2172
#28 0x000000000063c394 in Fprogn (body=...) at eval.c:449
#29 0x000000000063dff6 in Flet (args=...) at eval.c:963
#30 0x0000000000641126 in eval_sub (form=...) at eval.c:2172
#31 0x000000000063c394 in Fprogn (body=...) at eval.c:449
#32 0x0000000000643c19 in funcall_lambda (fun=..., nargs=1, arg_vector=0x0)
    at eval.c:3014
#33 0x0000000000642d10 in Ffuncall (nargs=2, args=0x7fffe598adf0) at eval.c:2757
#34 0x0000000000642577 in call1 (fn=..., arg1=...) at eval.c:2605
#35 0x00000000006501f6 in mapcar1 (leni=1, vals=0x7fffe598aea0, fn=..., seq=...)
    at fns.c:2471
#36 0x0000000000650615 in Fmapcar (function=..., sequence=...) at fns.c:2523
#37 0x000000000064150d in eval_sub (form=...) at eval.c:2222
#38 0x000000000063c394 in Fprogn (body=...) at eval.c:449
#39 0x000000000063e450 in internal_catch (tag=..., func=0x63c33d <Fprogn>, arg=...)
    at eval.c:1091
#40 0x000000000063e404 in Fcatch (args=...) at eval.c:1068
#41 0x0000000000641126 in eval_sub (form=...) at eval.c:2172
#42 0x000000000064129a in eval_sub (form=...) at eval.c:2184
#43 0x000000000063c394 in Fprogn (body=...) at eval.c:449
#44 0x000000000063dff6 in Flet (args=...) at eval.c:963
#45 0x0000000000641126 in eval_sub (form=...) at eval.c:2172
#46 0x000000000063c394 in Fprogn (body=...) at eval.c:449
#47 0x000000000062cb7b in Fsave_excursion (args=...) at editfns.c:1053
#48 0x0000000000641126 in eval_sub (form=...) at eval.c:2172
#49 0x000000000063c394 in Fprogn (body=...) at eval.c:449
#50 0x0000000000641126 in eval_sub (form=...) at eval.c:2172
#51 0x000000000063c394 in Fprogn (body=...) at eval.c:449
#52 0x0000000000643c19 in funcall_lambda (fun=..., nargs=4, arg_vector=0x0)
    at eval.c:3014
#53 0x0000000000642d10 in Ffuncall (nargs=5, args=0x7fffe598bb50) at eval.c:2757
#54 0x0000000000641eb0 in Fapply (nargs=3, args=0x7fffe598bd80) at eval.c:2374
#55 0x0000000000642f81 in funcall_subr (subr=0xd719a8 <Sapply>, numargs=3, args=0x7fffe598bd80) at eval.c:2798
#56 0x0000000000642bda in Ffuncall (nargs=4, args=0x7fffe598bd78) at eval.c:2743
#57 0x0000000000691dd2 in exec_byte_code (bytestr=..., vector=..., maxdepth=..., args_template=..., nargs=4, args=0x7fffe598c488) at bytecode.c:641
#58 0x00000000006437e1 in funcall_lambda (fun=..., nargs=4, arg_vector=0x7fffe598c480) at eval.c:2943
#59 0x0000000000643418 in apply_lambda (fun=..., args=..., count=4) at eval.c:2880
#60 0x00000000006416da in eval_sub (form=...) at eval.c:2264
#61 0x000000000064129a in eval_sub (form=...) at eval.c:2184
#62 0x000000000063c5d8 in Fsetq (args=...) at eval.c:511
#63 0x0000000000641126 in eval_sub (form=...) at eval.c:2172
#64 0x000000000063c394 in Fprogn (body=...) at eval.c:449
#65 0x0000000000643c19 in funcall_lambda (fun=..., nargs=0, arg_vector=0x0)
    at eval.c:3014
#66 0x0000000000642d10 in Ffuncall (nargs=1, args=0x6117b30) at eval.c:2757
#67 0x00000000006cfe09 in invoke_thread_function () at thread.c:669
#68 0x000000000063eef9 in internal_condition_case (bfun=0x6cfde1 <invoke_thread_function>, handlers=..., hfun=0x6cfe28 <record_thread_error>) at eval.c:1324
#69 0x00000000006cff5c in run_thread (state=0x6117b10) at thread.c:708
#70 0x00007ffff01c52e7 in start_thread () at /usr/lib/libpthread.so.0
#71 0x00007fffefad454f in clone () at /usr/lib/libc.so.6

Lisp Backtrace:
"accept-process-output" (0xe5987f10)
"nnheader-accept-process-output" (0xe5988640)
"nnimap-wait-for-response" (0xe5988e60)
"nnimap-get-response" (0xe5989560)
"nnimap-command" (0xe5989cb0)
"nnimap-change-group" (0xe598a3c0)
"if" (0xe598a6b0)
"condition-case" (0xe598a940)
"let" (0xe598aba0)
0x61e7760 Lisp type 3
"mapcar" (0xe598afa0)
"catch" (0xe598b1f0)
"apply" (0xe598b360)
"let" (0xe598b5e0)
"save-excursion" (0xe598b7a0)
"progn" (0xe598b920)
0x660b320 Lisp type 3
"apply" (0xe598bd80)
"nnir-run-search" (0xe598c480)
"vconcat" (0xe598c760)
"setq" (0xe598c930)
0x61e9790 Lisp type 3