1716603 - [meta] Track results of adding new macOS compact unwinding information to the symbol server

Status: RESOLVED FIXED

(Toolkit :: Crash Reporting, task)

Description

[Steven Michaud [:smichaud] (Retired)]

As of around 15:40 UTC on 2021-06-14, symbol files containing a new kind of compact unwinding information were uploaded to the Mozilla symbol server. These are for system calls on macOS.

They should improve the quality of macOS crash reports. But there may be side effects. And macOS crash reports may still sometimes be of insufficient quality. This bug is for keeping track of these problems.

I generated these symbol files by manual scraping. So far I've only done this for the latest builds of macOS 11 (11.4, build 20F71), 10.15.7 (build 19H1217) and 10.14.6 (build 18G9216). I used the latest version of Mozilla's Rust-based dump_syms, but only after one of its dependencies, Sentry's Symbolic had been updated to add support for Apple's new "compact unwinding" information.

Comment 1

[Steven Michaud [:smichaud] (Retired)]

Here's a current list of crash reports generated using the new compact unwinding information:

https://crash-stats.mozilla.org/search/?platform_version=~19H1217&platform_version=~20F71&platform_version=~18G9216&version=91.0a1&date=%3E%3D2021-06-14T15%3A40%3A00.000Z&date=%3C2021-06-15T17%3A04%3A00.000Z&_facets=signature&_sort=-date&_columns=date&_columns=signature&_columns=product&_columns=version&_columns=build_id&_columns=platform#facet-signature

Note that only on the current nightly branch (91) do Mozilla's own symbol files also have the new unwinding information. So only for the list above are all the elements of each crash stack generated using this information. In the list below, only the elements corresponding to macOS system calls are generated using the new information:

https://crash-stats.mozilla.org/search/?platform_version=~19H1217&platform_version=~20F71&platform_version=~18G9216&date=%3E%3D2021-06-14T15%3A40%3A00.000Z&date=%3C2021-06-15T17%3A10%3A00.000Z&_facets=signature&_sort=-date&_columns=date&_columns=signature&_columns=product&_columns=version&_columns=build_id&_columns=platform#facet-signature

Comment 2

[Steven Michaud [:smichaud] (Retired)]

Here's a current list of crash reports generated using the new compact unwinding information:

Oops, I was wrong. Support on Mozilla trunk for the Apple's new compact unwinding information was only landed yesterday (at bug 1691022)! Apparently the only change needed was to make Mozilla's toolkit use a newer version of Rust (as also now required by Sentry's Symbolic). The following list takes account of this:

https://crash-stats.mozilla.org/search/?platform_version=~19H1217&platform_version=~20F71&platform_version=~18G9216&build_id=%3E%3D20210614215408&version=91.0a1&date=%3E%3D2021-06-14T15%3A40%3A00.000Z&date=%3C2021-06-15T19%3A43%3A00.000Z&_facets=signature&_sort=-date&_columns=date&_columns=signature&_columns=product&_columns=version&_columns=build_id&_columns=platform#facet-signature

Comment 3

[Gabriele Svelto [:gsvelto]]

All the dependencies have been closed, can we close this bug Steven?

Comment 4

[Steven Michaud [:smichaud] (Retired)]

That's fine with me.