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* [merge to stable-22-2] Fix a segfault in debug mode when the allocated ↵sharpeye2022-04-181-3/+8
| | | | | | | | | | | | | memory accidentally contains 0xF0000000 Наш сервис при сборке с `ALLOCATOR(LF_DBG)` на старте падает [в этой строчке](https://a.yandex-team.ru/arc_vcs/commit/r7923656#file-library/cpp/lfalloc/lf_allocX64.h:R1901) при попытке разыменовать очевидно невалидный указатель. В gdb видно, что мы при попытке определить координаты фиктивного заголовка в `GetAllocHeader()` прочитали какие-то левые 32 бита в качестве `header->Tag`, и они по стечению обстоятельств оказались равны `0xF0000000` в нашем случае (просто не повезло). После этого мы решаем, что в `header->Size` лежит настоящий указатель на заголовок, хотя на самом деле там лежит тоже что-то рандомное. Решение, вроде бы, простое — когда формируем фиктивный заголовок, надо не обращать внимания на теги (потому что к этому моменту их ещё некому было записать). REVIEW: 2408267 REVIEW: 2438642 x-ydb-stable-ref: 02ccf11b927a06e81b968e8b45c287957b8e1d60
* intermediate changesarcadia-devtools2022-02-182-0/+20
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