On Mon, 11 Mar 2024 at 17:59, Brian Inglis via Cygwin <cygwin@cygwin.com> wrote: > > On 2024-03-11 04:27, Roland Mainz via Cygwin wrote: > > On Mon, Mar 11, 2024 at 8:01 AM Cedric Blancher via Cygwin > > <cygwin@cygwin.com> wrote: > >> On Fri, 8 Mar 2024 at 03:25, Dan Shelton via Cygwin <cygwin@cygwin.com> > >> wrote: > >>> I've run into a problem with clang on Cygwin 3.5.1 and 3.6. My machine > >>> does not have much disk space left, so I switched TMPDIR to the > >>> network drive. But clang then failed, like this: > >>> > >>> $ cat x.c > >>> #include <stdio.h> > >>> int main(int ac, char *av[]) { puts("hello world"); return 0 ; } > >>> $ mkdir /cygdrive/t/tmpdir > >>> $ TMPDIR=/cygdrive/t/tmpdir clang x.c > >>> error: unable to open output file '/cygdrive/t/tmpdir/x-01564d.o': > >>> 'Operation not permitted' > >>> 1 error generated. > >>> > >>> /cygdrive/t/tmpdir/ is a clean dir. > >>> /usr/bin/touch /cygdrive/t/tmpdir/dummy works without problems > >> > >> I can confirm the bug, but only for the clang version linked to > >> Cygwin. clang version of MinGW does not show that error, so this looks > >> like a Cygwin bug. > > > > I can reproduce the bug on Cygwin "CYGWIN_NT-10.0-19045 > > 3.6.0-0.73.gc2310061c66a.x86_64": > > ---- snip ---- > > $ cat x.c > > #include <stdio.h> > > int main(int ac, char *av[]) { puts("hello world"); return 0 ; } > > > > $ TMPDIR=/cygdrive/t/tmpdir/ strace -o clang_tmpdir_on_nfs41fs.log > > "C:\cygwin64\bin\clang-8.exe" x.c > > error: unable to open output file '/cygdrive/t/tmpdir/x-8cb6f7.o': > > 'Operation not permitted' > > 1 error generated. > > ---- snip ---- > > > > Full strace log is at https://nrubsig.kpaste.net/ff6248c25 (I use the > > line numbers from that site below). > > > > It seems starting with line 2949 this goes wrong: > > ---- snip ---- > > 505 5069822 [main] clang-8 40295 symlink_info::check: 0x0 = > > NtCreateFile (\??\T:\tmpdir\x-8cb6f7.o) > > 3645 5073467 [main] clang-8 40295 symlink_info::check: not a symlink > > 266 5073733 [main] clang-8 40295 symlink_info::check: 0 = > > symlink.check(T:\tmpdir\x-8cb6f7.o, 0x7FFFF96E0) (mount_flags 0x4020, > > path_flags 0x0) > > 310 5074043 [main] clang-8 40295 path_conv::check: > > this->path(T:\tmpdir\x-8cb6f7.o), has_acls(1) > > 305 5074348 [main] clang-8 40295 build_fh_pc: fh 0x800027A30, dev > > 000000C3 > > 1441 5075789 [main] clang-8 40295 __set_errno: int > > check_access(security_descriptor&, GENERIC_MAPPING&, ACCESS_MASK, int, > > bool):600 setting errno 13 > > 257 5076046 [main] clang-8 40295 check_file_access: flags 0x2, ret -1 > > ---- snip ---- > > > > So |build_fh_pc()| somehow fails with error 13... but I don't understand > > why... > > > > And then there is this weird ACL: > > ---- snip ----- > > $ ls -l /cygdrive/t/tmpdir/x-8cb6f7.o > > -rw------- 1 Unix_User+197608 Unix_Group+197121 0 Mar 11 11:00 > > /cygdrive/t/tmpdir/x-8cb6f7.o > > $ getfacl /cygdrive/t/tmpdir/x-8cb6f7.o > > # file: /cygdrive/t/tmpdir/x-8cb6f7.o > > # owner: Unix_User+197608 > > # group: Unix_Group+197121 > > user::--- > > group::--- > > other::--- > > ---- snip ---- > > > > /usr/bin/file, echo&&/&/usr/bin/cat can read/write that file > > ---- snip ---- > > $ file /cygdrive/t/tmpdir/x-8cb6f7.o > > /cygdrive/t/tmpdir/x-8cb6f7.o: empty > > $ echo "foo" >>/cygdrive/t/tmpdir/x-8cb6f7.o > > $ cat /cygdrive/t/tmpdir/x-8cb6f7.o > > foo > > ---- snip ---- > > > > I have no idea why clang fails in this case... I need help with this one... > > For normal temp space behaviour under Cygwin, I found you have to: > > chmod -c a+rwxt /cygdrive/t/tmpdir/ > setfacl -m u::rwx,g::rwx,o::rwx,d:u::rwx,d:g::rwx,d:o::rwx /cygdrive/t/tmpdir/ > > to set the DACLs to rwx and avoid any problems.
That does not work either. Dan -- Dan Shelton - Cluster Specialist Win/Lin/Bsd -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple