Bug#1000652: /usr/bin/iconv: bus error iconv -f CP1251 -t UTF-8 wmsal.h -o wmsal.h

[Mathieu Malaterre <malat@debian.org>]

Package: libc-bin
Version: 2.31-13+deb11u2
Severity: normal
File: /usr/bin/iconv

Dear Maintainer,

Steps:

% wget https://raw.githubusercontent.com/4creators/jxrlib/master/common/include/wmsal.h
% iconv -f CP1251 -t UTF-8 wmsal.h -o wmsal.h
zsh: bus error  iconv -f CP1251 -t UTF-8 wmsal.h -o wmsal.h

I see this documented as well known error:

https://myotragusbalearicus.wordpress.com/2010/03/10/batch-convert-files-to-utf-8/

For reference:

Program received signal SIGBUS, Bus error.
0x00007ffff7fc0578 in from_gap (irreversible=0x7fffffff5990, outend=0x55555556dfc0 "", outptrp=<synthetic pointer>, inend=0x7ffff7fbe69e <error: Cannot access memory at address 0x7ffff7fbe69e>,
    inptrp=0x7fffffff5ad8, step_data=0x555555565fd0, step=0x555555565800) at ../iconv/loop.c:336
336           BODY
(gdb) bt
#0  0x00007ffff7fc0578 in from_gap (irreversible=0x7fffffff5990, outend=0x55555556dfc0 "", outptrp=<synthetic pointer>, inend=0x7ffff7fbe69e <error: Cannot access memory at address 0x7ffff7fbe69e>,
    inptrp=0x7fffffff5ad8, step_data=0x555555565fd0, step=0x555555565800) at ../iconv/loop.c:336
#1  gconv (step=0x555555565800, data=0x555555565fd0, inptrp=0x7fffffff5ad8, inend=0x7ffff7fbe69e <error: Cannot access memory at address 0x7ffff7fbe69e>, outbufstart=0x0, irreversible=0x7fffffff5a70,
    do_flush=0, consume_incomplete=0) at ../iconv/skeleton.c:620
#2  0x00007ffff7dd56bf in __gconv (cd=0x555555565fc0, inbuf=inbuf@entry=0x7fffffff5ad8, inbufend=0x7ffff7fbe69e <error: Cannot access memory at address 0x7ffff7fbe69e>, outbuf=outbuf@entry=0x7fffffff5ae0,
    outbufend=<optimized out>, irreversible=irreversible@entry=0x7fffffff5a70) at gconv.c:78
#3  0x00007ffff7dd50e7 in iconv (cd=<optimized out>, inbuf=0x7fffffff5ad8, inbytesleft=0x7fffffff5ad0, outbuf=0x7fffffff5ae0, outbytesleft=0x7fffffff5ae8) at iconv.c:52
#4  0x0000555555558274 in ?? ()
#5  0x000055555555780b in ?? ()
#6  0x00007ffff7dd4d0a in __libc_start_main (main=0x5555555575a0, argc=8, argv=0x7fffffffdd58, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffdd48)
    at ../csu/libc-start.c:308
#7  0x0000555555557d1a in ?? ()
(gdb) list
331
332           /* Here comes the body the user provides.  It can stop with
333              RESULT set to GCONV_INCOMPLETE_INPUT (if the size of the
334              input characters vary in size), GCONV_ILLEGAL_INPUT, or
335              GCONV_FULL_OUTPUT (if the output characters vary in size).  */
336           BODY
337         }
338
339       /* Update the pointers pointed to by the parameters.  */
340       *inptrp = inptr;
(gdb)

Thanks

-- System Information:
Debian Release: 11.1
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable-debug'), (500, 'proposed-updates-debug'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.14.0-0.bpo.2-amd64 (SMP w/8 CPU threads)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages libc-bin depends on:
ii  libc6  2.31-13+deb11u2

Versions of packages libc-bin recommends:
ii  manpages  5.10-1

libc-bin suggests no packages.

-- no debconf information