tarantool / luajit / 10792163058

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

5685 of 6027 branches covered (94.33%)

Branch coverage included in aggregate %.

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

14 existing lines in 4 files now uncovered.

21668 of 23435 relevant lines covered (92.46%)

2940210.56 hits per line