On 12.09.2017 06:35, Mark Johnston wrote: >> [...] >> FreeBSD/SMP: 2 package(s) x 14 core(s) x 2 hardware threads >> >> Also I determined that it can successfully boot with disabled >> hyper-threading. > > After the change to CACHE_LINE_SIZE, we have > sizeof(struct uma_zone) == 448 and sizeof(struct uma_cache) == 64. With > 56 CPUs, we therefore need 4032 bytes per UMA zone, plus 80 bytes for > the slab header - "internal" zones always keep the slab header in the > slab itself. That's slightly larger than one page, but the UMA zone > zone's keg will have uk_ppera == 1. So, when allocating slabzone, > keg_alloc_slab() will call startup_alloc(uk_ppera * PAGE_SIZE), which > will allocate 4096 bytes for a structure that is 4032 + 80 = 4112 bytes > in size. > > I think the bug is that keg_large_init() doesn't take > sizeof(struct uma_slab) into account when setting uk_ppera for the keg. > In particular, the bug isn't specific to the bootup process; it only > affects internal zones with an item size in the range [4016, 4096]. > > The patch below should fix this - could you give it a try? Hi Mark,
I can confirm that it fixes this panic. Thanks! -- WBR, Andrey V. Elsukov
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