"mcopy" does not translate some filename

[b00n]

Binary package hint: mtools

Running on 10.04 freshly updated.

$ apt-cache policy mtools
mtools:
  Installed: 4.0.10-1ubuntu1
  Candidate: 4.0.10-1ubuntu1
  Version table:
 *** 4.0.10-1ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ lucid/main Packages
        100 /var/lib/dpkg/status

What I expected: "mcopy" would "mangle" Linux filenames as needed so they would work on fat32.

What happened: error messages, directories not created, ordinary file not created, "mcopy" crashes.

More details:

The mtools info says it will translate some special characters to underscores if the target file system does not support them. Copying from ext4 to fat32, I get error messages from mcopy that look like untranslated characters:

$ mcopy -b -s -p -m -D a -D A ~/Music/* /media/1B08-461A/MUSIC/
mkdir: Invalid argument
Failure to make directory /media/1B08-461A/MUSIC//Alex de Grassi/Turning: Turning Back
mkdir: Invalid argument
Failure to make directory /media/1B08-461A/MUSIC//Alison Krauss/Now That I've Found You: A Collection
mkdir: Invalid argument
Failure to make directory /media/1B08-461A/MUSIC//Art of Noise/(Who's Afraid Of?) The Art of Noise!
mkdir: Invalid argument
Failure to make directory /media/1B08-461A/MUSIC//Berghoff, Indictor, Garafalo, Indictor, Kahane, Tepp, Zack
Can't open /media/1B08-461A/MUSIC//Crash Test Dummies/God Shuffled His Feet/8 - How Does a Duck Know?.ogg: Invalid argument

I'm not sure if this is related, but it looks like this might ultimately lead to a crash:

*** stack smashing detected ***: mcopy terminated
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6(__fortify_fail+0x50)[0xaf7390]
/lib/tls/i686/cmov/libc.so.6(+0xe233a)[0xaf733a]
mcopy[0x8058360]
[0x61206469]
======= Memory map: ========
003ca000-003e5000 r-xp 00000000 08:01 573 /lib/ld-2.11.1.so
003e5000-003e6000 r--p 0001a000 08:01 573 /lib/ld-2.11.1.so
003e6000-003e7000 rw-p 0001b000 08:01 573 /lib/ld-2.11.1.so
004bc000-004bd000 r-xp 00000000 00:00 0 [vdso]
00596000-005b3000 r-xp 00000000 08:01 892 /lib/libgcc_s.so.1
005b3000-005b4000 r--p 0001c000 08:01 892 /lib/libgcc_s.so.1
005b4000-005b5000 rw-p 0001d000 08:01 892 /lib/libgcc_s.so.1
00a15000-00b68000 r-xp 00000000 08:01 289041 /lib/tls/i686/cmov/libc-2.11.1.so
00b68000-00b69000 ---p 00153000 08:01 289041 /lib/tls/i686/cmov/libc-2.11.1.so
00b69000-00b6b000 r--p 00153000 08:01 289041 /lib/tls/i686/cmov/libc-2.11.1.so
00b6b000-00b6c000 rw-p 00155000 08:01 289041 /lib/tls/i686/cmov/libc-2.11.1.so
00b6c000-00b6f000 rw-p 00000000 00:00 0
00f93000-00fa6000 r-xp 00000000 08:01 289049 /lib/tls/i686/cmov/libnsl-2.11.1.so
00fa6000-00fa7000 r--p 00012000 08:01 289049 /lib/tls/i686/cmov/libnsl-2.11.1.so
00fa7000-00fa8000 rw-p 00013000 08:01 289049 /lib/tls/i686/cmov/libnsl-2.11.1.so
00fa8000-00faa000 rw-p 00000000 00:00 0
08048000-0806e000 r-xp 00000000 08:01 1498 /usr/bin/mtools
0806e000-0806f000 r--p 00025000 08:01 1498 /usr/bin/mtools
0806f000-08070000 rw-p 00026000 08:01 1498 /usr/bin/mtools
08070000-08072000 rw-p 00000000 00:00 0
088e7000-08908000 rw-p 00000000 00:00 0 [heap]
b774d000-b778c000 r--p 00000000 08:01 3542367 /usr/lib/locale/en_US.utf8/LC_CTYPE
b778c000-b78aa000 r--p 00000000 08:01 3542368 /usr/lib/locale/en_US.utf8/LC_COLLATE
b78aa000-b78ac000 rw-p 00000000 00:00 0
b78ac000-b78ad000 r--p 00000000 08:01 3568279 /usr/lib/locale/en_US.utf8/LC_NUMERIC
b78ad000-b78ae000 r--p 00000000 08:01 3542406 /usr/lib/locale/en_US.utf8/LC_TIME
b78ae000-b78af000 r--p 00000000 08:01 3542407 /usr/lib/locale/en_US.utf8/LC_MONETARY
b78af000-b78b0000 r--p 00000000 08:01 3542408 /usr/lib/locale/en_US.utf8/LC_MESSAGES/SYS_LC_MESSAGES
b78b0000-b78b1000 r--p 00000000 08:01 3568285 /usr/lib/locale/en_US.utf8/LC_PAPER
b78b1000-b78b2000 r--p 00000000 08:01 3568286 /usr/lib/locale/en_US.utf8/LC_NAME
b78b2000-b78b3000 r--p 00000000 08:01 3542409 /usr/lib/locale/en_US.utf8/LC_ADDRESS
b78b3000-b78b4000 r--p 00000000 08:01 3542410 /usr/lib/locale/en_US.utf8/LC_TELEPHONE
b78b4000-b78b5000 r--p 00000000 08:01 3568289 /usr/lib/locale/en_US.utf8/LC_MEASUREMENT
b78b5000-b78bc000 r--s 00000000 08:01 288675 /usr/lib/gconv/gconv-modules.cache
b78bc000-b78bd000 r--p 00000000 08:01 3542411 /usr/lib/locale/en_US.utf8/LC_IDENTIFICATION
b78bd000-b78bf000 rw-p 00000000 00:00 0
bfd4a000-bfd6f000 rw-p 00000000 00:00 0 [stack]
Aborted

[b00n (ub-0003)]

Crash repeats on another file with '?' in the filename.