tarantool / luajit / 11367162229

93%

tarantool/master: 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

Run Details

5688 of 6029 branches covered (94.34%)

Branch coverage included in aggregate %.

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

4 existing lines in 1 file now uncovered.

21685 of 23435 relevant lines covered (92.53%)

2956158.41 hits per line