bug#36263: 26.2.90; expand-file-name assertion failure if HOME is unset

bug#36263: 26.2.90; expand-file-name assertion failure if HOME is unset

[Philipp Stephani]

$ HOME= ./emacs -Q -batch -eval '(expand-file-name "~")'

fileio.c:1330: Emacs fatal error: assertion failed: tlen > file_name_as_directory_slop + 1
Fatal error 6: Aborted
Backtrace:
./emacs[0x5c24e5]
./emacs[0x5944c5]
./emacs[0x62f5da]
./emacs[0x5ea04c]
./emacs[0x658beb]
./emacs[0x6586e2]
./emacs[0x6b152d]
./emacs[0x659332]
./emacs[0x658726]
./emacs[0x6b152d]
./emacs[0x659332]
./emacs[0x658f9b]
./emacs[0x656f91]
./emacs[0x656246]
./emacs[0x59920e]
./emacs[0x654514]
./emacs[0x599253]
./emacs[0x6539bd]
./emacs[0x59913d]
./emacs[0x5986bc]
./emacs[0x5988b1]
./emacs[0x596325]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xeb)[0x7fdcac6ba52b]
./emacs[0x41674a]
Aborted (core dumped)

Stack trace:

#0  0x0000000000594422 in terminate_due_to_signal (sig=6, backtrace_limit=2147483647) at emacs.c:368
#1  0x000000000062f5da in die (msg=0x77a418 "tlen > file_name_as_directory_slop + 1", file=0x77a2ff "fileio.c", line=1330) at alloc.c:7381
#2  0x00000000005ea04c in Fexpand_file_name (name=XIL(0x2c6ff24), default_directory=XIL(0x2c6ecd4)) at fileio.c:1330
        nm = 0x7fffffffc4b1 ""
        nmlim = 0x7fffffffc4b1 ""
        newdir = 0xb902de <pure+3799998> ""
        newdirlim = 0xb902de <pure+3799998> ""
        target = 0x59025a <BUFFER_OBJFWDP+24> "\203\370\003\017\224\300\311\303UH\211\345H\203\354\020H\211}\370\017\266\005s\354g"
        tlen = 3
        pw = 0xbfaa40 <bo_fwd>
        length = 0
        nbytes = 5532672
        handler = XIL(0)
        result = XIL(0xf5462ce2d34d2200)
        handled_name = XIL(0x7f0744)
        multibyte = true
        hdir = XIL(0x7f0764)
        sa_avail = 16382
        sa_count = 9
        sa_must_free = false
        defdir_multibyte = true
#3  0x0000000000658beb in funcall_subr (subr=0x7eed80 <Sexpand_file_name>, numargs=1, args=0x7fffffffc708) at eval.c:2853
        internal_argbuf = {XIL(0x82d87c), XIL(0), XIL(0x7eed85), XIL(0x7fffffffc648), XIL(0x7eed80), XIL(0x7fffffffc640), XIL(0x58f137), XIL(0x7eed85)}
        internal_args = 0x7fffffffc600
#4  0x00000000006586e2 in Ffuncall (nargs=2, args=0x7fffffffc700) at eval.c:2776
        fun = XIL(0x7eed85)
        original_fun = XIL(0x5580)
        funcar = XIL(0)
        numargs = 1
        val = XIL(0)
        count = 8
#5  0x00000000006b152d in exec_byte_code (bytestr=XIL(0x8472ac), vector=XIL(0x8472cd), maxdepth=make_number(10), args_template=make_number(257), nargs=1, args=0x7fffffffcc58) at bytecode.c:630
        op = 1
        type = (unknown: 4)
        targets = 
          {0x6b4ef0 <exec_byte_code+18747>, 0x6b4f21 <exec_byte_code+18796>, 0x6b4f23 <exec_byte_code+18798>, 0x6b4f25 <exec_byte_code+18800>, 0x6b4f27 <exec_byte_code+18802>, 0x6b4f27 <exec_byte_code+18802>, 0x6b4fa4 <exec_byte_code+18927>, 0x6b5033 <exec_byte_code+19070>, 0x6b0b05 <exec_byte_code+1360>, 0x6b0b07 <exec_byte_code+1362>, 0x6b0b09 <exec_byte_code+1364>, 0x6b0b0b <exec_byte_code+1366>, 0x6b0b0d <exec_byte_code+1368>, 0x6b0b0d <exec_byte_code+1368>, 0x6b0b16 <exec_byte_code+1377>, 0x6b0ac2 <exec_byte_code+1293>, 0x6b1090 <exec_byte_code+2779>, 0x6b1092 <exec_byte_code+2781>, 0x6b1094 <exec_byte_code+2783>, 0x6b1096 <exec_byte_code+2785>, 0x6b1098 <exec_byte_code+2787>, 0x6b1098 <exec_byte_code+2787>, 0x6b10e2 <exec_byte_code+2861>, 0x6b10a1 <exec_byte_code+2796>, 0x6b1405 <exec_byte_code+3664>, 0x6b1407 <exec_byte_code+3666>, 0x6b1409 <exec_byte_code+3668>, 0x6b140b <exec_byte_code+3670>, 0x6b140d <exec_byte_code+3672>, 0x6b140d <exec_byte_code+3672>, 0x6b13a4 <exec_byte_code+3567>, 0x6b13c4 <exec_byte_code+3599>, 0x6b14eb <exec_byte_code+3894>, 0x6b14ed <exec_byte_code+3896>, 0x6b14ef <exec_byte_code+3898>, 0x6b14f1 <exec_byte_code+3900>, 0x6b14f3 <exec_byte_code+3902>, 0x6b14f3 <exec_byte_code+3902>, 0x6b148a <exec_byte_code+3797>, 0x6b14aa <exec_byte_code+3829>, 0x6b15d9 <exec_byte_code+4132>, 0x6b15db <exec_byte_code+4134>, 0x6b15dd <exec_byte_code+4136>, 0x6b15df <exec_byte_code+4138>, 0x6b15e1 <exec_byte_code+4140>, 0x6b15e1 <exec_byte_code+4140>, 0x6b1578 <exec_byte_code+4035>, 0x6b1598 <exec_byte_code+4067>, 0x6b2022 <exec_byte_code+6765>, 0x6b1eea <exec_byte_code+6453>, 0x6b1ede <exec_byte_code+6441>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b22bc <exec_byte_code+7431>, 0x6b23ff <exec_byte_code+7754>, 0x6b247e <exec_byte_code+7881>, 0x6b24fe <exec_byte_code+8009>, 0x6b257f <exec_byte_code+8138>, 0x6b0e92 <exec_byte_code+2269>, 0x6b0f32 <exec_byte_code+2429>, 0x6b2618 <exec_byte_code+8291>, 0x6b0db5 <exec_byte_code+2048>, 0x6b0fb2 <exec_byte_code+2557>, 0x6b269f <exec_byte_code+8426>, 0x6b271f <exec_byte_code+8554>, 0x6b2779 <exec_byte_code+8644>, 0x6b27f9 <exec_byte_code+8772>, 0x6b2860 <exec_byte_code+8875>, 0x6b296a <exec_byte_code+9141>, 0x6b29c4 <exec_byte_code+9231>, 0x6b2a44 <exec_byte_code+9359>, 0x6b2ae7 <exec_byte_code+9522>, 0x6b2b41 <exec_byte_code+9612>, 0x6b2b9b <exec_byte_code+9702>, 0x6b2c1b <exec_byte_code+9830>, 0x6b2c9b <exec_byte_code+9958>, 0x6b2d1b <exec_byte_code+10086>, 0x6b2dbe <exec_byte_code+10249>, 0x6b2e25 <exec_byte_code+10352>, 0x6b2e8c <exec_byte_code+10455>, 0x6b2f96 <exec_byte_code+10721>, 0x6b302b <exec_byte_code+10870>, 0x6b30c0 <exec_byte_code+11019>, 0x6b32aa <exec_byte_code+11509>, 0x6b332f <exec_byte_code+11642>, 0x6b33b4 <exec_byte_code+11775>, 0x6b3439 <exec_byte_code+11908>, 0x6b34be <exec_byte_code+12041>, 0x6b3525 <exec_byte_code+12144>, 0x6b35be <exec_byte_code+12297>, 0x6b3625 <exec_byte_code+12400>, 0x6b368c <exec_byte_code+12503>, 0x6b36f3 <exec_byte_code+12606>, 0x6b3841 <exec_byte_code+12940>, 0x6b1d22 <exec_byte_code+5997>, 0x6b38b1 <exec_byte_code+13052>, 0x6b390b <exec_byte_code+13142>, 0x6b3a0d <exec_byte_code+13400>, 0x6b3a88 <exec_byte_code+13523>, 0x6b3af8 <exec_byte_code+13635>, 0x6b3b52 <exec_byte_code+13725>, 0x6b3baa <exec_byte_code+13813>, 0x6b3c02 <exec_byte_code+13901>, 0x6b3c62 <exec_byte_code+13997>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b3ccc <exec_byte_code+14103>, 0x6b3d24 <exec_byte_code+14191>, 0x6b3d7c <exec_byte_code+14279>, 0x6b3dd4 <exec_byte_code+14367>, 0x6b3e2c <exec_byte_code+14455>, 0x6b3e84 <exec_byte_code+14543>, 0x6b1d22 <exec_byte_code+5997>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b3ede <exec_byte_code+14633>, 0x6b3f45 <exec_byte_code+14736>, 0x6b3f9f <exec_byte_code+14826>, 0x6b3ff9 <exec_byte_code+14916>, 0x6b4079 <exec_byte_code+15044>, 0x6b40f9 <exec_byte_code+15172>, 0x6b4153 <exec_byte_code+15262>, 0x6b42a0 <exec_byte_code+15595>, 0x6b4320 <exec_byte_code+15723>, 0x6b43a0 <exec_byte_code+15851>, 0x6b4420 <exec_byte_code+15979>, 0x6b4478 <exec_byte_code+16067>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b1c23 <exec_byte_code+5742>, 0x6b16b1 <exec_byte_code+4348>, 0x6b0d02 <exec_byte_code+1869>, 0x6b17a0 <exec_byte_code+4587>, 0x6b1845 <exec_byte_code+4752>, 0x6b18e7 <exec_byte_code+4914>, 0x6b1bc5 <exec_byte_code+5648>, 0x6b1bdd <exec_byte_code+5672>, 0x6b133c <exec_byte_code+3463>, 0x6b1ccd <exec_byte_code+5912>, 0x6b1d65 <exec_byte_code+6064>, 0x6b1e02 <exec_byte_code+6221>, 0x6b1e57 <exec_byte_code+6306>, 0x6b207a <exec_byte_code+6853>, 0x6b2109 <exec_byte_code+6996>, 0x6b21ac <exec_byte_code+7159>, 0x6b2221 <exec_byte_code+7276>, 0x6b1654 <exec_byte_code+4255>, 0x6b44d2 <exec_byte_code+16157>, 0x6b4575 <exec_byte_code+16320>, 0x6b45cf <exec_byte_code+16410>, 0x6b4629 <exec_byte_code+16500>, 0x6b4683 <exec_byte_code+16590>, 0x6b46dd <exec_byte_code+16680>, 0x6b475d <exec_byte_code+16808>, 0x6b47dd <exec_byte_code+16936>, 0x6b485d <exec_byte_code+17064>, 0x6b48dd <exec_byte_code+17192>, 0x6b4a7a <exec_byte_code+17605>, 0x6b4afa <exec_byte_code+17733>, 0x6b4b7a <exec_byte_code+17861>, 0x6b4bd4 <exec_byte_code+17951>, 0x6b4c54 <exec_byte_code+18079>, 0x6b4cd4 <exec_byte_code+18207>, 0x6b4d2e <exec_byte_code+18297>, 0x6b4d88 <exec_byte_code+18387>, 0x6b375a <exec_byte_code+12709>, 0x6b37c1 <exec_byte_code+12812>, 0x6b4def <exec_byte_code+18490>, 0x6b4e70 <exec_byte_code+18619>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b1989 <exec_byte_code+5076>, 0x6b19af <exec_byte_code+5114>, 0x6b1a36 <exec_byte_code+5249>, 0x6b1abd <exec_byte_code+5384>, 0x6b1b41 <exec_byte_code+5516>, 0x6b28c7 <exec_byte_code+8978>, 0x6b2ef3 <exec_byte_code+10558>, 0x6b396a <exec_byte_code+13237>, 0x6b50ed <exec_byte_code+19256>, 0x6b5177 <exec_byte_code+19394>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b522e <exec_byte_code+19577>, 0x6b52df <exec_byte_code+19754>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b54e5 <exec_byte_code+20272> <repeats 64 times>}
        const_length = 38
        bytestr_length = 227
        vectorp = 0x8472d0 <pure+355248>
        quitcounter = 1 '\001'
        stack_items = 11
        sa_avail = 16069
        sa_count = 6
        sa_must_free = false
        stack_base = 0x7fffffffc6d0
        stack_lim = 0x7fffffffc728
        top = 0x7fffffffc700
        void_stack_lim = 0x7fffffffc728
        bytestr_data = 0x7fffffffc728 "\306 \307\310\311\312\313\005!\314\"\315$\216\b\203."
        pc = 0x7fffffffc785 "#\210\327\033\330\331\303\324N!\332Q\023\333\v!\203t"
        count = 6
        result = XIL(0x7fffffffca70)
#6  0x0000000000659332 in funcall_lambda (fun=XIL(0x84727d), nargs=1, arg_vector=0x7fffffffcc50) at eval.c:2977
        size = 5
        val = XIL(0x58e8e3)
        syms_left = make_number(257)
        next = XIL(0x847278)
        lexenv = XIL(0x7fffffffcbb8)
        count = 6
        i = 77322061600
        optional = false
        rest = false
        previous_optional_or_rest = false
#7  0x0000000000658726 in Ffuncall (nargs=2, args=0x7fffffffcc48) at eval.c:2778
        fun = XIL(0x84727d)
        original_fun = XIL(0x47d9f0)
        funcar = XIL(0xcbaac0)
        numargs = 1
        val = XIL(0x47d0)
        count = 5
#8  0x00000000006b152d in exec_byte_code (bytestr=XIL(0x8f7774), vector=XIL(0x8f7795), maxdepth=make_number(12), args_template=make_number(0), nargs=0, args=0x7fffffffd240) at bytecode.c:630
        op = 1
        type = (CONDITION_CASE | CATCHER_ALL | unknown: 32764)
        targets = 
          {0x6b4ef0 <exec_byte_code+18747>, 0x6b4f21 <exec_byte_code+18796>, 0x6b4f23 <exec_byte_code+18798>, 0x6b4f25 <exec_byte_code+18800>, 0x6b4f27 <exec_byte_code+18802>, 0x6b4f27 <exec_byte_code+18802>, 0x6b4fa4 <exec_byte_code+18927>, 0x6b5033 <exec_byte_code+19070>, 0x6b0b05 <exec_byte_code+1360>, 0x6b0b07 <exec_byte_code+1362>, 0x6b0b09 <exec_byte_code+1364>, 0x6b0b0b <exec_byte_code+1366>, 0x6b0b0d <exec_byte_code+1368>, 0x6b0b0d <exec_byte_code+1368>, 0x6b0b16 <exec_byte_code+1377>, 0x6b0ac2 <exec_byte_code+1293>, 0x6b1090 <exec_byte_code+2779>, 0x6b1092 <exec_byte_code+2781>, 0x6b1094 <exec_byte_code+2783>, 0x6b1096 <exec_byte_code+2785>, 0x6b1098 <exec_byte_code+2787>, 0x6b1098 <exec_byte_code+2787>, 0x6b10e2 <exec_byte_code+2861>, 0x6b10a1 <exec_byte_code+2796>, 0x6b1405 <exec_byte_code+3664>, 0x6b1407 <exec_byte_code+3666>, 0x6b1409 <exec_byte_code+3668>, 0x6b140b <exec_byte_code+3670>, 0x6b140d <exec_byte_code+3672>, 0x6b140d <exec_byte_code+3672>, 0x6b13a4 <exec_byte_code+3567>, 0x6b13c4 <exec_byte_code+3599>, 0x6b14eb <exec_byte_code+3894>, 0x6b14ed <exec_byte_code+3896>, 0x6b14ef <exec_byte_code+3898>, 0x6b14f1 <exec_byte_code+3900>, 0x6b14f3 <exec_byte_code+3902>, 0x6b14f3 <exec_byte_code+3902>, 0x6b148a <exec_byte_code+3797>, 0x6b14aa <exec_byte_code+3829>, 0x6b15d9 <exec_byte_code+4132>, 0x6b15db <exec_byte_code+4134>, 0x6b15dd <exec_byte_code+4136>, 0x6b15df <exec_byte_code+4138>, 0x6b15e1 <exec_byte_code+4140>, 0x6b15e1 <exec_byte_code+4140>, 0x6b1578 <exec_byte_code+4035>, 0x6b1598 <exec_byte_code+4067>, 0x6b2022 <exec_byte_code+6765>, 0x6b1eea <exec_byte_code+6453>, 0x6b1ede <exec_byte_code+6441>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b22bc <exec_byte_code+7431>, 0x6b23ff <exec_byte_code+7754>, 0x6b247e <exec_byte_code+7881>, 0x6b24fe <exec_byte_code+8009>, 0x6b257f <exec_byte_code+8138>, 0x6b0e92 <exec_byte_code+2269>, 0x6b0f32 <exec_byte_code+2429>, 0x6b2618 <exec_byte_code+8291>, 0x6b0db5 <exec_byte_code+2048>, 0x6b0fb2 <exec_byte_code+2557>, 0x6b269f <exec_byte_code+8426>, 0x6b271f <exec_byte_code+8554>, 0x6b2779 <exec_byte_code+8644>, 0x6b27f9 <exec_byte_code+8772>, 0x6b2860 <exec_byte_code+8875>, 0x6b296a <exec_byte_code+9141>, 0x6b29c4 <exec_byte_code+9231>, 0x6b2a44 <exec_byte_code+9359>, 0x6b2ae7 <exec_byte_code+9522>, 0x6b2b41 <exec_byte_code+9612>, 0x6b2b9b <exec_byte_code+9702>, 0x6b2c1b <exec_byte_code+9830>, 0x6b2c9b <exec_byte_code+9958>, 0x6b2d1b <exec_byte_code+10086>, 0x6b2dbe <exec_byte_code+10249>, 0x6b2e25 <exec_byte_code+10352>, 0x6b2e8c <exec_byte_code+10455>, 0x6b2f96 <exec_byte_code+10721>, 0x6b302b <exec_byte_code+10870>, 0x6b30c0 <exec_byte_code+11019>, 0x6b32aa <exec_byte_code+11509>, 0x6b332f <exec_byte_code+11642>, 0x6b33b4 <exec_byte_code+11775>, 0x6b3439 <exec_byte_code+11908>, 0x6b34be <exec_byte_code+12041>, 0x6b3525 <exec_byte_code+12144>, 0x6b35be <exec_byte_code+12297>, 0x6b3625 <exec_byte_code+12400>, 0x6b368c <exec_byte_code+12503>, 0x6b36f3 <exec_byte_code+12606>, 0x6b3841 <exec_byte_code+12940>, 0x6b1d22 <exec_byte_code+5997>, 0x6b38b1 <exec_byte_code+13052>, 0x6b390b <exec_byte_code+13142>, 0x6b3a0d <exec_byte_code+13400>, 0x6b3a88 <exec_byte_code+13523>, 0x6b3af8 <exec_byte_code+13635>, 0x6b3b52 <exec_byte_code+13725>, 0x6b3baa <exec_byte_code+13813>, 0x6b3c02 <exec_byte_code+13901>, 0x6b3c62 <exec_byte_code+13997>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b3ccc <exec_byte_code+14103>, 0x6b3d24 <exec_byte_code+14191>, 0x6b3d7c <exec_byte_code+14279>, 0x6b3dd4 <exec_byte_code+14367>, 0x6b3e2c <exec_byte_code+14455>, 0x6b3e84 <exec_byte_code+14543>, 0x6b1d22 <exec_byte_code+5997>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b3ede <exec_byte_code+14633>, 0x6b3f45 <exec_byte_code+14736>, 0x6b3f9f <exec_byte_code+14826>, 0x6b3ff9 <exec_byte_code+14916>, 0x6b4079 <exec_byte_code+15044>, 0x6b40f9 <exec_byte_code+15172>, 0x6b4153 <exec_byte_code+15262>, 0x6b42a0 <exec_byte_code+15595>, 0x6b4320 <exec_byte_code+15723>, 0x6b43a0 <exec_byte_code+15851>, 0x6b4420 <exec_byte_code+15979>, 0x6b4478 <exec_byte_code+16067>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b1c23 <exec_byte_code+5742>, 0x6b16b1 <exec_byte_code+4348>, 0x6b0d02 <exec_byte_code+1869>, 0x6b17a0 <exec_byte_code+4587>, 0x6b1845 <exec_byte_code+4752>, 0x6b18e7 <exec_byte_code+4914>, 0x6b1bc5 <exec_byte_code+5648>, 0x6b1bdd <exec_byte_code+5672>, 0x6b133c <exec_byte_code+3463>, 0x6b1ccd <exec_byte_code+5912>, 0x6b1d65 <exec_byte_code+6064>, 0x6b1e02 <exec_byte_code+6221>, 0x6b1e57 <exec_byte_code+6306>, 0x6b207a <exec_byte_code+6853>, 0x6b2109 <exec_byte_code+6996>, 0x6b21ac <exec_byte_code+7159>, 0x6b2221 <exec_byte_code+7276>, 0x6b1654 <exec_byte_code+4255>, 0x6b44d2 <exec_byte_code+16157>, 0x6b4575 <exec_byte_code+16320>, 0x6b45cf <exec_byte_code+16410>, 0x6b4629 <exec_byte_code+16500>, 0x6b4683 <exec_byte_code+16590>, 0x6b46dd <exec_byte_code+16680>, 0x6b475d <exec_byte_code+16808>, 0x6b47dd <exec_byte_code+16936>, 0x6b485d <exec_byte_code+17064>, 0x6b48dd <exec_byte_code+17192>, 0x6b4a7a <exec_byte_code+17605>, 0x6b4afa <exec_byte_code+17733>, 0x6b4b7a <exec_byte_code+17861>, 0x6b4bd4 <exec_byte_code+17951>, 0x6b4c54 <exec_byte_code+18079>, 0x6b4cd4 <exec_byte_code+18207>, 0x6b4d2e <exec_byte_code+18297>, 0x6b4d88 <exec_byte_code+18387>, 0x6b375a <exec_byte_code+12709>, 0x6b37c1 <exec_byte_code+12812>, 0x6b4def <exec_byte_code+18490>, 0x6b4e70 <exec_byte_code+18619>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b1989 <exec_byte_code+5076>, 0x6b19af <exec_byte_code+5114>, 0x6b1a36 <exec_byte_code+5249>, 0x6b1abd <exec_byte_code+5384>, 0x6b1b41 <exec_byte_code+5516>, 0x6b28c7 <exec_byte_code+8978>, 0x6b2ef3 <exec_byte_code+10558>, 0x6b396a <exec_byte_code+13237>, 0x6b50ed <exec_byte_code+19256>, 0x6b5177 <exec_byte_code+19394>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b522e <exec_byte_code+19577>, 0x6b52df <exec_byte_code+19754>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b4ef0 <exec_byte_code+18747>, 0x6b54e5 <exec_byte_code+20272> <repeats 64 times>}
        const_length = 77
        bytestr_length = 447
        vectorp = 0x8f7798 <pure+1077368>
        quitcounter = 39 '\''
        stack_items = 13
        sa_avail = 15833
        sa_count = 5
        sa_must_free = false
        stack_base = 0x7fffffffcc40
        stack_lim = 0x7fffffffcca8
        top = 0x7fffffffcc48
        void_stack_lim = 0x7fffffffcca8
        bytestr_data = 0x7fffffffcca8 "\b\203\b"
        pc = 0x7fffffffce07 "\024\202h\001\365\366\367\"\210\016F\332\370\371\335\336\005!\372\"\373$\216\374 \210)\210\375\376\377\"\210\201H"
        count = 5
        result = XIL(0)
#9  0x0000000000659332 in funcall_lambda (fun=XIL(0x8f7745), nargs=0, arg_vector=0x7fffffffd240) at eval.c:2977
        size = 5
        val = XIL(0x7fffffffd240)
        syms_left = make_number(0)
        next = XIL(0x5904bc)
        lexenv = make_number(0)
        count = 5
        i = 6673927
        optional = 127
        rest = false
        previous_optional_or_rest = false
#10 0x0000000000658f9b in apply_lambda (fun=XIL(0x8f7745), args=XIL(0), count=4) at eval.c:2913
        args_left = XIL(0)
        i = 0
        numargs = 0
        arg_vector = 0x7fffffffd240
        tem = XIL(0x1200c10720)
        sa_avail = 16384
        sa_count = 5
        sa_must_free = false
#11 0x0000000000656f91 in eval_sub (form=XIL(0x13b2e63)) at eval.c:2286
        fun = XIL(0x8f7745)
        val = XIL(0xc0fe40)
        original_fun = XIL(0xe22310)
        original_args = XIL(0)
        funcar = XIL(0xc10720)
        count = 4
        argvals = {XIL(0x11c40c0), XIL(0xc18130), make_number(1458326), XIL(0x11c40c0), XIL(0x7fffffffd3c0), XIL(0x65a5e4), XIL(0), XIL(0x7a10)}
#12 0x0000000000656246 in Feval (form=XIL(0x13b2e63), lexical=XIL(0)) at eval.c:2061
        count = 3
#13 0x000000000059920e in top_level_2 () at keyboard.c:1119
#14 0x0000000000654514 in internal_condition_case (bfun=0x5991eb <top_level_2>, handlers=XIL(0x5280), hfun=0x598bd2 <cmd_error>) at eval.c:1336
        val = XIL(0xca2a83)
        c = 0x2c6a440
#15 0x0000000000599253 in top_level_1 (ignore=XIL(0)) at keyboard.c:1127
#16 0x00000000006539bd in internal_catch (tag=XIL(0xc900), func=0x599210 <top_level_1>, arg=XIL(0)) at eval.c:1101
        val = make_number(1455970)
        c = 0x2c6a320
#17 0x000000000059913d in command_loop () at keyboard.c:1088
#18 0x00000000005986bc in recursive_edit_1 () at keyboard.c:695
        count = 1
        val = XIL(0x7fffffffd540)
#19 0x00000000005988b1 in Frecursive_edit () at keyboard.c:766
        count = 0
        buffer = XIL(0)
#20 0x0000000000596325 in main (argc=5, argv=0x7fffffffd758) at emacs.c:1722
        stack_bottom_variable = 0x2c5f500
        do_initial_setlocale = true
        dumping = false
        skip_args = 1
        no_loadup = false
        junk = 0x0
        dname_arg = 0x0
        ch_to_dir = 0x0
        original_pwd = 0x0
        disable_aslr = false
        rlim = {
          rlim_cur = 10022912, 
          rlim_max = 18446744073709551615
        }
        sockfd = -1
        module_assertions = false

Lisp Backtrace:
"expand-file-name" (0xffffc708)
"abbreviate-file-name" (0xffffcc50)
"normal-top-level" (0xffffd240)
"expand-file-name" (0xffffc708)
"abbreviate-file-name" (0xffffcc50)
"normal-top-level" (0xffffd240)



In GNU Emacs 26.2.90 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.2)
 of 2019-06-17
Repository revision: 81535eeadb5b9b964dd195b2720de2b1fc432c6e
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description:	Debian GNU/Linux rodete

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Eager macro-expansion failure: (error "Unknown seq pattern: (seq 3 (pred (lambda (c) (and (characterp c) (= (aref (symbol-name (category c)) 0) 76)))))")
C-c C-c is undefined

Configured using:
 'configure --enable-checking=all --enable-gcc-warnings=warn-only
 --enable-gtk-deprecation-warnings --enable-check-lisp-object-type
 --with-modules 'CFLAGS=-O0 -ggdb3 -fstack-protector-strong -Wformat
 -Werror=format-security -Wall' --without-pop 'LDFLAGS=-Wl,-z,relro
 -Wl,-fuse-ld=gold''

Configured features:
XPM JPEG TIFF GIF PNG SOUND DBUS GSETTINGS GLIB NOTIFY GNUTLS FREETYPE
XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS
LIBSYSTEMD

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc puny seq dired
dired-loaddefs format-spec rfc822 mml easymenu mml-sec epa epg
epg-config gnus-util rmail rmail-loaddefs mm-decode mm-bodies mm-encode
mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047
rfc2045 ietf-drums mm-util mail-prsvr mail-utils phst skeleton derived
edmacro kmacro pcase ffap thingatpt url-parse auth-source cl-seq eieio
byte-opt bytecomp byte-compile cconv eieio-core cl-macs gv
eieio-loaddefs password-cache url-vars subr-x rx gnutls dbus xml
cl-loaddefs cl-lib elec-pair time-date mule-util tooltip eldoc electric
uniquify ediff-hook vc-hooks lisp-float-type mwheel term/x-win x-win
term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode elisp-mode lisp-mode
prog-mode register page menu-bar rfn-eshadow isearch timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame cl-generic cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms cp51932
hebrew greek romanian slovak czech european ethiopic indian cyrillic
chinese composite charscript charprop case-table epa-hook jka-cmpr-hook
help simple abbrev obarray minibuffer cl-preloaded nadvice loaddefs
button faces cus-face macroexp files text-properties overlay sha1 md5
base64 format env code-pages mule custom widget hashtable-print-readable
backquote threads dbusbind inotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 16 109060 6105)
 (symbols 48 22238 1)
 (miscs 40 41 128)
 (strings 32 32963 1633)
 (string-bytes 1 896833)
 (vectors 16 16193)
 (vector-slots 8 535544 8856)
 (floats 8 54 63)
 (intervals 56 228 0)
 (buffers 992 12))

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bug#36263: Fixed in master

[Philipp Stephani]

This bug is no longer present in master. It would be nice to backport
a fix to the release branch since it's a crashing bug that's quite
easy to trigger.

bug#36263: Fixed in master

[Eli Zaretskii]

> From: Philipp Stephani <p.stephani2@gmail.com>
> Date: Mon, 17 Jun 2019 14:33:57 +0200
> 
> This bug is no longer present in master. It would be nice to backport
> a fix to the release branch since it's a crashing bug that's quite
> easy to trigger.

AFAICT, the "fix" on master is quite convoluted, and IMO doesn't
really solve the problem, it just makes it harder to reproduce: when
HOME is not defined, Emacs 27 calls alternative interfaces, but if
those also fail to returns a usable string, it eventually can also
return an empty string, and cause the same assertion violation.

OTOH, I see the same assertion violation in Emacs 25.2, so this is far
from a new problem.

On the third hand, this assertion compiles to nothing in a production
version, so a production version doesn't crash.

Therefore, it sounds like it isn't important enough to fix this on the
release branch, unless I'm missing something.

Thanks.

bug#36263: Fixed in master

[Eli Zaretskii]

> Date: Mon, 17 Jun 2019 18:22:10 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 36263@debbugs.gnu.org
> 
> OTOH, I see the same assertion violation in Emacs 25.2, so this is far
> from a new problem.
> 
> On the third hand, this assertion compiles to nothing in a production
> version, so a production version doesn't crash.
> 
> Therefore, it sounds like it isn't important enough to fix this on the
> release branch, unless I'm missing something.

Actually, I think that assertion has an off-by-one error, it should be

  eassert (tlen >= file_name_as_directory_slop + 1);

If I change it this way, the recipe finishes and returns an empty
string.  Does anyone see a problem with making such a change on
master?  (I still think that we don't need to make any changes on the
release branch.)

Thanks.

bug#36263: Fixed in master

[Eli Zaretskii]

> Date: Mon, 17 Jun 2019 20:36:48 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 36263@debbugs.gnu.org
> 
> Actually, I think that assertion has an off-by-one error, it should be
> 
>   eassert (tlen >= file_name_as_directory_slop + 1);
> 
> If I change it this way, the recipe finishes and returns an empty
> string.  Does anyone see a problem with making such a change on
> master?  (I still think that we don't need to make any changes on the
> release branch.)

No comments, so I've now made that change on the master branch, and
I'm closing this bug.