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I bisected this between > v6.14-rc5 and next-20250307 and got this as the first bad commit: > > 7ffb791423c7c518269a9aad35039ef824a40adb is the first bad commit > commit 7ffb791423c7c518269a9aad35039ef824a40adb (HEAD) > Author: Balbir Singh > Date: Fri Feb 7 10:42:34 2025 +1100 > > x86/kaslr: Reduce KASLR entropy on most x86 systems > > Reverting commit 7ffb791423c7 in next-20250307 fixes the issue for me. > Thanks for the report! Could you also share the dmesg? Do you have any proprietary modules loaded? Could you also share the output of /proc/iomem (captured as sudo)? The lspci output is useful, lspci -vvv (captured with sudo) would help see where the BAR regions are, specifically before and after the patch. Could you also share the kernel config? I assume your config has CONFIG_PCI_P2PDMA enabled. Did the system ever work with nokaslr for you? I am a little surprised that reducing the entropy causes these issues and having a larger direct map causes these issues. Balbir Singh