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Peter Anvin" , Linus Torvalds , Andy Shevchenko , Matthew Wilcox , Sean Christopherson , Davide Ciminaghi , Paolo Bonzini , kvm@vger.kernel.org, Mike Rapoport References: <20241204103042.1904639-1-arnd@kernel.org> <20241204103042.1904639-6-arnd@kernel.org> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; keydata= xsFNBE6HMP0BEADIMA3XYkQfF3dwHlj58Yjsc4E5y5G67cfbt8dvaUq2fx1lR0K9h1bOI6fC oAiUXvGAOxPDsB/P6UEOISPpLl5IuYsSwAeZGkdQ5g6m1xq7AlDJQZddhr/1DC/nMVa/2BoY 2UnKuZuSBu7lgOE193+7Uks3416N2hTkyKUSNkduyoZ9F5twiBhxPJwPtn/wnch6n5RsoXsb ygOEDxLEsSk/7eyFycjE+btUtAWZtx+HseyaGfqkZK0Z9bT1lsaHecmB203xShwCPT49Blxz VOab8668QpaEOdLGhtvrVYVK7x4skyT3nGWcgDCl5/Vp3TWA4K+IofwvXzX2ON/Mj7aQwf5W iC+3nWC7q0uxKwwsddJ0Nu+dpA/UORQWa1NiAftEoSpk5+nUUi0WE+5DRm0H+TXKBWMGNCFn c6+EKg5zQaa8KqymHcOrSXNPmzJuXvDQ8uj2J8XuzCZfK4uy1+YdIr0yyEMI7mdh4KX50LO1 pmowEqDh7dLShTOif/7UtQYrzYq9cPnjU2ZW4qd5Qz2joSGTG9eCXLz5PRe5SqHxv6ljk8mb ApNuY7bOXO/A7T2j5RwXIlcmssqIjBcxsRRoIbpCwWWGjkYjzYCjgsNFL6rt4OL11OUF37wL QcTl7fbCGv53KfKPdYD5hcbguLKi/aCccJK18ZwNjFhqr4MliQARAQABzUVEYXZpZCBDaHJp c3RvcGhlciBIYW5zZW4gKEludGVsIFdvcmsgQWRkcmVzcykgPGRhdmUuaGFuc2VuQGludGVs LmNvbT7CwXgEEwECACIFAlQ+9J0CGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEGg1 lTBwyZKwLZUP/0dnbhDc229u2u6WtK1s1cSd9WsflGXGagkR6liJ4um3XCfYWDHvIdkHYC1t MNcVHFBwmQkawxsYvgO8kXT3SaFZe4ISfB4K4CL2qp4JO+nJdlFUbZI7cz/Td9z8nHjMcWYF IQuTsWOLs/LBMTs+ANumibtw6UkiGVD3dfHJAOPNApjVr+M0P/lVmTeP8w0uVcd2syiaU5jB aht9CYATn+ytFGWZnBEEQFnqcibIaOrmoBLu2b3fKJEd8Jp7NHDSIdrvrMjYynmc6sZKUqH2 I1qOevaa8jUg7wlLJAWGfIqnu85kkqrVOkbNbk4TPub7VOqA6qG5GCNEIv6ZY7HLYd/vAkVY E8Plzq/NwLAuOWxvGrOl7OPuwVeR4hBDfcrNb990MFPpjGgACzAZyjdmYoMu8j3/MAEW4P0z F5+EYJAOZ+z212y1pchNNauehORXgjrNKsZwxwKpPY9qb84E3O9KYpwfATsqOoQ6tTgr+1BR CCwP712H+E9U5HJ0iibN/CDZFVPL1bRerHziuwuQuvE0qWg0+0SChFe9oq0KAwEkVs6ZDMB2 P16MieEEQ6StQRlvy2YBv80L1TMl3T90Bo1UUn6ARXEpcbFE0/aORH/jEXcRteb+vuik5UGY 5TsyLYdPur3TXm7XDBdmmyQVJjnJKYK9AQxj95KlXLVO38lczsFNBFRjzmoBEACyAxbvUEhd GDGNg0JhDdezyTdN8C9BFsdxyTLnSH31NRiyp1QtuxvcqGZjb2trDVuCbIzRrgMZLVgo3upr MIOx1CXEgmn23Zhh0EpdVHM8IKx9Z7V0r+rrpRWFE8/wQZngKYVi49PGoZj50ZEifEJ5qn/H Nsp2+Y+bTUjDdgWMATg9DiFMyv8fvoqgNsNyrrZTnSgoLzdxr89FGHZCoSoAK8gfgFHuO54B lI8QOfPDG9WDPJ66HCodjTlBEr/Cwq6GruxS5i2Y33YVqxvFvDa1tUtl+iJ2SWKS9kCai2DR 3BwVONJEYSDQaven/EHMlY1q8Vln3lGPsS11vSUK3QcNJjmrgYxH5KsVsf6PNRj9mp8Z1kIG qjRx08+nnyStWC0gZH6NrYyS9rpqH3j+hA2WcI7De51L4Rv9pFwzp161mvtc6eC/GxaiUGuH BNAVP0PY0fqvIC68p3rLIAW3f97uv4ce2RSQ7LbsPsimOeCo/5vgS6YQsj83E+AipPr09Caj 0hloj+hFoqiticNpmsxdWKoOsV0PftcQvBCCYuhKbZV9s5hjt9qn8CE86A5g5KqDf83Fxqm/ vXKgHNFHE5zgXGZnrmaf6resQzbvJHO0Fb0CcIohzrpPaL3YepcLDoCCgElGMGQjdCcSQ+Ci FCRl0Bvyj1YZUql+ZkptgGjikQARAQABwsFfBBgBAgAJBQJUY85qAhsMAAoJEGg1lTBwyZKw l4IQAIKHs/9po4spZDFyfDjunimEhVHqlUt7ggR1Hsl/tkvTSze8pI1P6dGp2XW6AnH1iayn yRcoyT0ZJ+Zmm4xAH1zqKjWplzqdb/dO28qk0bPso8+1oPO8oDhLm1+tY+cOvufXkBTm+whm +AyNTjaCRt6aSMnA/QHVGSJ8grrTJCoACVNhnXg/R0g90g8iV8Q+IBZyDkG0tBThaDdw1B2l asInUTeb9EiVfL/Zjdg5VWiF9LL7iS+9hTeVdR09vThQ/DhVbCNxVk+DtyBHsjOKifrVsYep WpRGBIAu3bK8eXtyvrw1igWTNs2wazJ71+0z2jMzbclKAyRHKU9JdN6Hkkgr2nPb561yjcB8 sIq1pFXKyO+nKy6SZYxOvHxCcjk2fkw6UmPU6/j/nQlj2lfOAgNVKuDLothIxzi8pndB8Jju KktE5HJqUUMXePkAYIxEQ0mMc8Po7tuXdejgPMwgP7x65xtfEqI0RuzbUioFltsp1jUaRwQZ MTsCeQDdjpgHsj+P2ZDeEKCbma4m6Ez/YWs4+zDm1X8uZDkZcfQlD9NldbKDJEXLIjYWo1PH hYepSffIWPyvBMBTW2W5FRjJ4vLRrJSUoEfJuPQ3vW9Y73foyo/qFoURHO48AinGPZ7PC7TF vUaNOTjKedrqHkaOcqB185ahG2had0xnFsDPlx5y In-Reply-To: <20241204103042.1904639-6-arnd@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Has anyone run into any problems on 6.15-rc1 with this stuff? 0xf75fe000 is the mem_map[] entry for the first page >4GB. It obviously wasn't allocated, thus the oops. Looks like the memblock for the >4GB memory didn't get removed although the pgdats seem correct. I'll dig into it some more. Just wanted to make sure there wasn't a fix out there already. The way I'm triggering this is booting qemu with a 32-bit PAE kernel, and "-m 4096" (or more). > [ 0.003806] Warning: only 4GB will be used. Support for for CONFIG_HIGHMEM64G was removed! ... > [ 0.561310] BUG: unable to handle page fault for address: f75fe000 > [ 0.562226] #PF: supervisor write access in kernel mode > [ 0.562947] #PF: error_code(0x0002) - not-present page > [ 0.563653] *pdpt = 0000000002da2001 *pde = 000000000300c067 *pte = 0000000000000000 > [ 0.564728] Oops: Oops: 0002 [#1] SMP NOPTI > [ 0.565315] CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted 6.15.0-rc1-00288-ge618ee89561b-dirty #311 PREEMPT(undef) > [ 0.567428] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 > [ 0.568777] EIP: __free_pages_core+0x3c/0x74 > [ 0.569378] Code: c3 d3 e6 83 ec 10 89 44 24 08 89 74 24 04 c7 04 24 c6 32 3a c2 89 55 f4 e8 a9 11 45 fe 85 f6 8b 55 f4 74 19 89 d8 31 c9 66 90 <0f> ba 30 0d c7 40 1c 00 00 00 00 41 83 c0 28 39 ce 75 ed 8b 03 c1 > [ 0.571943] EAX: f75fe000 EBX: f75fe000 ECX: 00000000 EDX: 0000000a > [ 0.572806] ESI: 00000400 EDI: 00500000 EBP: c247becc ESP: c247beb4 > [ 0.573776] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00210046 > [ 0.574606] CR0: 80050033 CR2: f75fe000 CR3: 02da6000 CR4: 000000b0 > [ 0.575464] Call Trace: > [ 0.575816] memblock_free_pages+0x11/0x2c > [ 0.576392] memblock_free_all+0x2ce/0x3a0 > [ 0.576955] mm_core_init+0xf5/0x320 > [ 0.577423] start_kernel+0x296/0x79c > [ 0.577950] ? set_init_arg+0x70/0x70 > [ 0.578478] ? load_ucode_bsp+0x13c/0x1a8 > [ 0.579059] i386_start_kernel+0xad/0xb0 > [ 0.579614] startup_32_smp+0x151/0x154 > [ 0.580100] Modules linked in: > [ 0.580358] CR2: 00000000f75fe000 > [ 0.580630] ---[ end trace 0000000000000000 ]--- > [ 0.581111] EIP: __free_pages_core+0x3c/0x74 > [ 0.581455] Code: c3 d3 e6 83 ec 10 89 44 24 08 89 74 24 04 c7 04 24 c6 32 3a c2 89 55 f4 e8 a9 11 45 fe 85 f6 8b 55 f4 74 19 89 d8 31 c9 66 90 <0f> ba 30 0d c7 40 1c 00 00 00 00 41 83 c0 28 39 ce 75 ed 8b 03 c1 > [ 0.584767] EAX: f75fe000 EBX: f75fe000 ECX: 00000000 EDX: 0000000a > [ 0.585651] ESI: 00000400 EDI: 00500000 EBP: c247becc ESP: c247beb4 > [ 0.586530] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00210046 > [ 0.587480] CR0: 80050033 CR2: f75fe000 CR3: 02da6000 CR4: 000000b0 > [ 0.588344] Kernel panic - not syncing: Attempted to kill the idle task! > [ 0.589435] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]--- > [ 0.561310] BUG: unable to handle page fault for address: f75fe000 > [ 0.562226] #PF: supervisor write access in kernel mode > [ 0.562947] #PF: error_code(0x0002) - not-present page > [ 0.563653] *pdpt = 0000000002da2001 *pde = 000000000300c067 *pte = 0000000000000000 > [ 0.564728] Oops: Oops: 0002 [#1] SMP NOPTI > [ 0.565315] CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted 6.15.0-rc1-00288-ge618ee89561b-dirty #311 PREEMPT(undef) > [ 0.567428] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 > [ 0.568777] EIP: __free_pages_core+0x3c/0x74 > [ 0.569378] Code: c3 d3 e6 83 ec 10 89 44 24 08 89 74 24 04 c7 04 24 c6 32 3a c2 89 55 f4 e8 a9 11 45 fe 85 f6 8b 55 f4 74 19 89 d8 31 c9 66 90 <0f> ba 30 0d c7 40 1c 00 00 00 00 41 83 c0 28 39 ce 75 ed 8b 03 c1 > [ 0.571943] EAX: f75fe000 EBX: f75fe000 ECX: 00000000 EDX: 0000000a > [ 0.572806] ESI: 00000400 EDI: 00500000 EBP: c247becc ESP: c247beb4 > [ 0.573776] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00210046 > [ 0.574606] CR0: 80050033 CR2: f75fe000 CR3: 02da6000 CR4: 000000b0 > [ 0.575464] Call Trace: > [ 0.575816] memblock_free_pages+0x11/0x2c > [ 0.576392] memblock_free_all+0x2ce/0x3a0 > [ 0.576955] mm_core_init+0xf5/0x320 > [ 0.577423] start_kernel+0x296/0x79c > [ 0.577950] ? set_init_arg+0x70/0x70 > [ 0.578478] ? load_ucode_bsp+0x13c/0x1a8 > [ 0.579059] i386_start_kernel+0xad/0xb0 > [ 0.579614] startup_32_smp+0x151/0x154 > [ 0.580100] Modules linked in: > [ 0.580358] CR2: 00000000f75fe000 > [ 0.580630] ---[ end trace 0000000000000000 ]--- > [ 0.581111] EIP: __free_pages_core+0x3c/0x74 > [ 0.581455] Code: c3 d3 e6 83 ec 10 89 44 24 08 89 74 24 04 c7 04 24 c6 32 3a c2 89 55 f4 e8 a9 11 45 fe 85 f6 8b 55 f4 74 19 89 d8 31 c9 66 90 <0f> ba 30 0d c7 40 1c 00 00 00 00 41 83 c0 28 39 ce 75 ed 8b 03 c1 > [ 0.584767] EAX: f75fe000 EBX: f75fe000 ECX: 00000000 EDX: 0000000a > [ 0.585651] ESI: 00000400 EDI: 00500000 EBP: c247becc ESP: c247beb4 > [ 0.586530] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00210046 > [ 0.587480] CR0: 80050033 CR2: f75fe000 CR3: 02da6000 CR4: 000000b0 > [ 0.588344] Kernel panic - not syncing: Attempted to kill the idle task! > [ 0.589435] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]---