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On an up-to-date Arch Linux system, not having jpegexiforient installed, feh segfaults if I open any jpeg and rotate it by pressing "<".
Here is the relevant GDB output:
feh WARNING: lossless rotate: Failed to exec jpegexiforient: No such file or directory
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff6701da8 in vfprintf () from /usr/lib/libc.so.6
#0 0x00007ffff6701da8 in vfprintf () from /usr/lib/libc.so.6
#1 0x00007ffff67b0250 in __vsnprintf_chk () from /usr/lib/libc.so.6
#2 0x0000000000409cfc in ?? ()
#3 0x000000000040bb76 in ?? ()
#4 0x000000000040bd7a in ?? ()
#5 0x000000000040f477 in ?? ()
#6 0x000000000040f9d1 in ?? ()
#7 0x0000000000405b3a in ?? ()
#8 0x00007ffff66d8725 in __libc_start_main () from /usr/lib/libc.so.6
#9 0x0000000000405c0d in ?? ()
Indeed, commenting out line 524 of imlib.c "vsnprintf(errstr, 1024, fmt, args);" prevents feh from crashing.