[Tarantool-patches] [PATCH luajit v3] sysprof: fix crash during FFUNC stream

[Igor Munkin]

Max,

I've checked the patchset into all long-term branches in
tarantool/luajit and bumped a new version in master, release/2.11 and
release/2.10.

On 10.07.23, Maxim Kokryashkin via Tarantool-patches wrote:
> Sometimes, the Lua stack can be inconsistent during
> the FFUNC execution, which may lead to a sysprof
> crash during the stack unwinding.
> 
> This patch replaces the `top_frame` property of `global_State`
> with `lj_sysprof_topframe` structure, which contains `top_frame`
> and `ffid` properties. `ffid` property makes sense only when the
> LuaJIT VM state is set to `FFUNC`. That property is set to the
> ffid of the fast function that VM is about to execute.
> In the same time, `top_frame` property is not updated now, so
> the top frame of the Lua stack can be streamed based on the ffid,
> and the rest of the Lua stack can be streamed as usual.
> 
> Also, this patch fixes build with plain makefile, by adding
> the `LJ_HASSYSPROF` flag support to it.
> 
> Resolves tarantool/tarantool#8594
> ---
> Changes in v3:
> - Fixed comments as per review by Sergey
> 
> Branch: https://github.com/tarantool/luajit/tree/fckxorg/gh-8594-sysprof-ffunc-crash
> PR: https://github.com/tarantool/tarantool/pull/8737
>  src/Makefile.original                         |  3 ++
>  src/lj_obj.h                                  |  7 +++-
>  src/lj_sysprof.c                              | 26 ++++++++++++---
>  src/vm_x64.dasc                               | 22 +++++++++++--
>  src/vm_x86.dasc                               | 31 ++++++++++++++---
>  .../gh-8594-sysprof-ffunc-crash.test.lua      | 33 +++++++++++++++++++
>  6 files changed, 109 insertions(+), 13 deletions(-)
>  create mode 100644 test/tarantool-tests/gh-8594-sysprof-ffunc-crash.test.lua
> 

<snipped>

> -- 
> 2.40.1
> 

-- 
Best regards,
IM