The value of variable key2 should be "bar". This way, when nil is assigned to val1 and garbage collection occurs, the output of m.keys will then be ["bar"].
In https://bugs.ruby-lang.org/issues/20693, I'd like to have Dir.tmpdir
call `File.writable?` instead of `Stat#writable?`. However, that causes
this test to break in bundler because it's using RSpec to stub
`File.writable?`.
We can fix this by allowing the real `File.writable?` to be called for
all files except the directory we're trying to stub.
https://github.com/rubygems/rubygems/commit/0fa6657293
When running as UID 0 but without CAP_DAC_OVERRIDE (for example, in a
docker container running with --uid 0 but --cap-drop=all), these tests
won't work because of hard-coded assumptions about what uid 0 can and
can't do.
Using gc_impl.h inside of gc/gc.h will cause gc/gc.h to use the functions
in gc/default.c when builing with shared GC support because gc/gc.h is
included into gc.c before the rb_gc_impl functions are overridden by the
preprocessor.
[Bug #20688]
We cannot free the key before the ST_DELETE because it could hash the
key which would read the key and would cause a use-after-free. Instead,
we store the key and free it on the next iteration.
[Bug #20688]
We cannot free the weakmap_entry before the ST_DELETE because it could
hash the key which would read the weakmap_entry and would cause a
use-after-free. Instead, we store the entry and free it on the next
iteration.
For example, the following script triggers a use-after-free in Valgrind:
weakmap = ObjectSpace::WeakMap.new
10_000.times { weakmap[Object.new] = Object.new }
==25795== Invalid read of size 8
==25795== at 0x462297: wmap_cmp (weakmap.c:165)
==25795== by 0x3A2B1C: find_table_bin_ind (st.c:930)
==25795== by 0x3A5EAA: st_general_foreach (st.c:1599)
==25795== by 0x3A5EAA: rb_st_foreach (st.c:1640)
==25795== by 0x25C991: gc_mark_children (default.c:4870)
==25795== by 0x25C991: gc_marks_wb_unprotected_objects_plane (default.c:5565)
==25795== by 0x25C991: rgengc_rememberset_mark_plane (default.c:5557)
==25795== by 0x25C991: rgengc_rememberset_mark (default.c:6233)
==25795== by 0x25C991: gc_marks_start (default.c:6057)
==25795== by 0x25C991: gc_marks (default.c:6077)
==25795== by 0x25C991: gc_start (default.c:6723)
==25795== by 0x260F96: heap_prepare (default.c:2282)
==25795== by 0x260F96: heap_next_free_page (default.c:2489)
==25795== by 0x260F96: newobj_cache_miss (default.c:2598)
==25795== by 0x26197F: newobj_alloc (default.c:2622)
==25795== by 0x26197F: rb_gc_impl_new_obj (default.c:2701)
==25795== by 0x26197F: newobj_of (gc.c:890)
==25795== by 0x26197F: rb_wb_protected_newobj_of (gc.c:917)
==25795== by 0x2DEA88: rb_class_allocate_instance (object.c:131)
==25795== by 0x2E3B18: class_call_alloc_func (object.c:2141)
==25795== by 0x2E3B18: rb_class_alloc (object.c:2113)
==25795== by 0x2E3B18: rb_class_new_instance_pass_kw (object.c:2172)
==25795== by 0x429DDC: vm_call_cfunc_with_frame_ (vm_insnhelper.c:3786)
==25795== by 0x44B08D: vm_sendish (vm_insnhelper.c:5953)
==25795== by 0x44B08D: vm_exec_core (insns.def:898)
==25795== by 0x43A7A4: rb_vm_exec (vm.c:2564)
==25795== by 0x234914: rb_ec_exec_node (eval.c:281)
==25795== Address 0x21603710 is 0 bytes inside a block of size 16 free'd
==25795== at 0x4849B2C: free (vg_replace_malloc.c:989)
==25795== by 0x249651: rb_gc_impl_free (default.c:8527)
==25795== by 0x249651: rb_gc_impl_free (default.c:8508)
==25795== by 0x249651: ruby_sized_xfree.constprop.0 (gc.c:4178)
==25795== by 0x4626EC: ruby_sized_xfree_inlined (gc.h:277)
==25795== by 0x4626EC: wmap_free_entry (weakmap.c:45)
==25795== by 0x4626EC: wmap_mark_weak_table_i (weakmap.c:61)
==25795== by 0x3A5CEF: apply_functor (st.c:1633)
==25795== by 0x3A5CEF: st_general_foreach (st.c:1543)
==25795== by 0x3A5CEF: rb_st_foreach (st.c:1640)
==25795== by 0x25C991: gc_mark_children (default.c:4870)
==25795== by 0x25C991: gc_marks_wb_unprotected_objects_plane (default.c:5565)
==25795== by 0x25C991: rgengc_rememberset_mark_plane (default.c:5557)
==25795== by 0x25C991: rgengc_rememberset_mark (default.c:6233)
==25795== by 0x25C991: gc_marks_start (default.c:6057)
==25795== by 0x25C991: gc_marks (default.c:6077)
==25795== by 0x25C991: gc_start (default.c:6723)
==25795== by 0x260F96: heap_prepare (default.c:2282)
==25795== by 0x260F96: heap_next_free_page (default.c:2489)
==25795== by 0x260F96: newobj_cache_miss (default.c:2598)
==25795== by 0x26197F: newobj_alloc (default.c:2622)
==25795== by 0x26197F: rb_gc_impl_new_obj (default.c:2701)
==25795== by 0x26197F: newobj_of (gc.c:890)
==25795== by 0x26197F: rb_wb_protected_newobj_of (gc.c:917)
==25795== by 0x2DEA88: rb_class_allocate_instance (object.c:131)
==25795== by 0x2E3B18: class_call_alloc_func (object.c:2141)
==25795== by 0x2E3B18: rb_class_alloc (object.c:2113)
==25795== by 0x2E3B18: rb_class_new_instance_pass_kw (object.c:2172)
==25795== by 0x429DDC: vm_call_cfunc_with_frame_ (vm_insnhelper.c:3786)
==25795== by 0x44B08D: vm_sendish (vm_insnhelper.c:5953)
==25795== by 0x44B08D: vm_exec_core (insns.def:898)
==25795== by 0x43A7A4: rb_vm_exec (vm.c:2564)
==25795== Block was alloc'd at
==25795== at 0x484680F: malloc (vg_replace_malloc.c:446)
==25795== by 0x25CE9E: rb_gc_impl_malloc (default.c:8542)
==25795== by 0x462A39: wmap_aset_replace (weakmap.c:423)
==25795== by 0x3A5542: rb_st_update (st.c:1487)
==25795== by 0x462B8E: wmap_aset (weakmap.c:452)
==25795== by 0x429DDC: vm_call_cfunc_with_frame_ (vm_insnhelper.c:3786)
==25795== by 0x44B08D: vm_sendish (vm_insnhelper.c:5953)
==25795== by 0x44B08D: vm_exec_core (insns.def:898)
==25795== by 0x43A7A4: rb_vm_exec (vm.c:2564)
==25795== by 0x234914: rb_ec_exec_node (eval.c:281)
==25795== by 0x2369B8: ruby_run_node (eval.c:319)
==25795== by 0x15D675: rb_main (main.c:43)
==25795== by 0x15D675: main (main.c:62)
The original implementation of this flag was too naive and all it did
was restricting gems to locally installed versions if there are any
local versions installed.
However, it should be much smarter. For example:
* It should fallback to remote versions if locally installed version
don't satisfy the requirements.
* It should pick locally installed versions even for subdependencies not
yet discovered.
This commit fixes both issues by using a smarter approach similar to how
we resolve prereleases:
* First resolve optimistically using only locally installed gems.
* If any conflicts are found, scan those conflicts, allow remote
versions for the specific gems that run into conflicts, and
re-resolve.
https://github.com/rubygems/rubygems/commit/607a3bf479
Co-authored-by: Gourav Khunger <gouravkhunger18@gmail.com>
These apparently break compilation on old MacOS toolchains, because the
MachO section name is capped to 16 chars (although, on my MacOS, at
least, the section name just gets truncated). Nevertheless, these serve
no purpose on non-ELF platforms (they're part of the LSB Linux ABI).
[Bug #20677]
This wasn't looking at the right macro name for pac-ret support, so if
Ruby was compiled with pac-ret but NOT BTI, then the ELF note would not
be emitted.
It is expected that reading from command with offset fails by ESPIPE
and the pipe will be closed immediately. While this causes the child
process to terminate by SIGPIPE usually, cmd.exe yields the message
bellow.
```
The process tried to write to a nonexistent pipe.
```
getlogin is only called if USER environment variable is not set,
but if getlogin returns NULL in that case, then do not call
getpwnam, and assume /bin/sh as shell.
Mentioned in comment to bug 20586.
We don't need to build a linked list from the finalizer table and
instead we can just run the finalizers by iterating the ST table.
This also improves the performance at shutdown, for example:
1_000_000.times.map do
o = Object.new
ObjectSpace.define_finalizer(o, proc { })
o
end
Before:
Time (mean ± σ): 1.722 s ± 0.056 s [User: 1.597 s, System: 0.113 s]
Range (min … max): 1.676 s … 1.863 s 10 runs
After:
Time (mean ± σ): 1.538 s ± 0.025 s [User: 1.437 s, System: 0.093 s]
Range (min … max): 1.510 s … 1.586 s 10 runs
