tarantool / luajit / 11368712946

93%

Build Type

push

github

Committed by Buristan

Commit Message

Fix stack allocation after on-trace stack check.

(cherry picked from commit 204cee2c9)

It is possible that a snapshot topslot is less than the possible topslot
of the Lua stack. In that case, if the Lua stack overflows in
`lj_vmevent_prepare()`, the error is raised inside
`lj_vm_exit_handler()`, which has no corresponding DWARF eh_frame [1],
so it leads to the crash.

This patch fix-ups the topslot of the snapshot on trace exit to the
maximum possible one.

Sergey Kaplun:
* added the description and the test for the problem

[1]: https://refspecs.linuxfoundation.org/LSB_3.0.0/LSB-Core-generic/LSB-Core-generic/ehframechpt.html

Part of tarantool/tarantool#10199

Reviewed-by: Sergey Bronnikov <sergeyb@tarantool.org>
Reviewed-by: Maxim Kokryashkin <m.kokryashkin@tarantool.org>
Signed-off-by: Sergey Kaplun <skaplun@tarantool.org>

Run Details

5695 of 6029 branches covered (94.46%)

Branch coverage included in aggregate %.

3 of 3 new or added lines in 1 file covered. (100.0%)

1 existing line in 1 file now uncovered.

21711 of 23435 relevant lines covered (92.64%)

2942270.77 hits per line