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In #2433, I inadvertently introduced a regression which causes the use of
uninitialized data. Namely, the control path I added for the safety
check in `arena_prof_info_get` neglected to set `prof_info->alloc_tctx`
when the check fails, resulting in `prof_info.alloc_tctx` being
uninitialized [when it is read at the end of
`prof_free`](
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