#577: EXC_BAD_ACCESS in IO.read ---------------------------------+------------------------------------------ Reporter: spamtrap1@… | Owner: lsansonetti@… Type: defect | Status: new Priority: minor | Milestone: Component: MacRuby | Keywords: ---------------------------------+------------------------------------------ I had a small spelling accident tonight, which caused me to stumble over this :[[BR]] using ios.read, with an argument of nil, i.e. {{{ s = "" f = File.open("xxx") while (!f.eof?) s += f.read(nil) end }}} will cause this : {{{ Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000000 Crashed Thread: 0 Dispatch queue: com.apple.main-thread Application Specific Information: objc[26488]: garbage collection is ON 0 libSystem.B.dylib 0x00007fffffe007c5 __memcpy + 37 1 libauto.dylib 0x00007fff83a1f210 auto_zone_write_barrier_memmove + 96 2 libauto.dylib 0x00007fff83a2020e auto_realloc(_malloc_zone_t*, void*, unsigned long) + 878 3 libSystem.B.dylib 0x00007fff84c1ab3b malloc_zone_realloc + 92 4 com.apple.CoreFoundation 0x00007fff8215eb49 __CFDataGrow + 233 5 com.apple.CoreFoundation 0x00007fff82184e05 CFDataSetLength + 181 6 libmacruby.dylib 0x000000010005c1fa rb_io_read_internal + 522 7 libmacruby.dylib 0x000000010005d6b6 rb_io_eof + 54 8 libmacruby.dylib 0x000000010016d32f rb_vm_dispatch + 7279 }}} Macruby version is Nightly build from 2010/01/26. The weird thing is i can only reproduce it with large files. My test files are CD sized, created with "dd if=/dev/random of=test.dat bs=65536 count=10000" I know calling read(nil) twice on a file doesn't make much sense, but reading the docs leads me to believe it should just return "" (http ://ruby-doc.org/core/classes/IO.html) -- Ticket URL: <http://www.macruby.org/trac/ticket/577> MacRuby <http://macruby.org/>