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 GknvAf4o dob/xMvfH64vXZd0fN3UuIlaDkuiebC/JE3IHbnjqHUgLpCbT3R8T6KwqToTuQOMazhD1LttTpnAyFvPHR7oJ1aIxOA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Jan 19, 2026 at 11:39:51AM +0100, David Hildenbrand (Red Hat) wrote: > On > > $ uname -r > 6.18.4-200.fc43.x86_64 > > I am getting > > $ ./va_high_addr_switch > mmap(addr_switch_hint - pagesize, pagesize): 0x7fe7de6d7000 - OK > mmap(addr_switch_hint - pagesize, (2 * pagesize)): 0x7fe7de6d6000 - OK > mmap(addr_switch_hint, pagesize): 0x7fe7de6d7000 - OK > mmap(addr_switch_hint, 2 * pagesize, MAP_FIXED): 0xffffffffffffffff - FAILED > mmap(NULL): 0x7fe7de6d5000 - OK > mmap(low_addr): 0x40000000 - OK > mmap(high_addr): 0x7fe7de6d5000 - OK > mmap(high_addr) again: 0x7fe7de6d3000 - OK > mmap(high_addr, MAP_FIXED): 0xffffffffffffffff - FAILED > mmap(-1): 0x7fe7de6d1000 - OK > mmap(-1) again: 0x7fe7de6cf000 - OK > mmap(addr_switch_hint - pagesize, pagesize): 0x7fe7de6d0000 - OK > mmap(addr_switch_hint - pagesize, 2 * pagesize): 0x7fe7de6cf000 - OK > mmap(addr_switch_hint - pagesize/2 , 2 * pagesize): 0x7fe7de6cd000 - OK > mmap(addr_switch_hint, pagesize): 0x7fe7de6cc000 - OK > mmap(addr_switch_hint, 2 * pagesize, MAP_FIXED): 0xffffffffffffffff - FAILED > > > Are these the same issues you see? No, that's entirely separate bug it seems :) Seems to work locally for me on 6.18.3, and also in VM with tip mm-unstable, strange. The issue here is with virtual_address_space.c which seems to just to be generally broken, I couldn't even bisect to a working one, and I really did try. Actually hang on, isn't va_high_addr_space already then testing what virtual_address_space should be testing anyway if it were sensible?? That suggests then that just removing virtual_address_space without replacement (since this already exists) is the right way (...!) Thanks, Lorenzo