IO#fsync doesn't trigger an fsync(2) syscall? #4073
Description
Hi there,
When I make a call to IO#fsync on an open file handle, I expected to
see an fsync(2) syscall triggered (as MRI Ruby does), but in the
current JRuby master branch I don't see that.
I'm testing on Linux thweeble 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt20-1+deb8u4 (2016-02-29) x86_64 GNU/Linux as follows:
# MRI Ruby
#
$ ruby --version
ruby 2.1.5p273 (2014-11-13) [x86_64-linux-gnu]
$ strace -qq -e fsync,fdatasync -f ruby -e 'File.open("/tmp/testfile", "w") do |fh| fh.write("test\n"); fh.fsync; end'
[pid 13600] fsync(7) = 0
# JRuby built from commit 0ebd63589cf430a171f4224da4226e8c86e52203
#
$ strace -qq -e fsync,fdatasync -f java -cp lib/jruby.jar org.jruby.Main -e 'File.open("/tmp/testfile", "w") do |fh| fh.write("test\n"); fh.fsync; end'
[pid 13702] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0} ---
[pid 13702] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0xc} ---
[pid 13722] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_ACCERR, si_addr=0x7ff5988cf700} ---
[pid 13708] <... futex resumed> ) = ? <unavailable>
Does this seem like a potential bug? I couldn't find any other issues
referencing this.
Thanks!
Mark