Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: BUG: Bad page map BUG: Bad page map in process syz-executor.0 pte:fffff9b7dc120 pmd:1ce8f067 page:ffffea00019208c0 refcount:9 mapcount:-1 mapping:ffff8880766e5190 index:0x3 pfn:0x64823 head:ffffea0001920800 order:2 entire_mapcount:0 nr_pages_mapped:8388607 pincount:0 memcg:ffff88801d8b4000 aops:xfs_address_space_operations ino:244a dentry name:"bus" flags: 0xfff0000000816c(referenced|uptodate|lru|active|private|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000000 ffffea0001920801 dead000000000122 dead000000000400 raw: 0000000000000001 0000000000000000 00000000fffffffe 0000000000000000 head: 00fff0000000816c ffffea0001a08288 ffff88807acd1030 ffff8880766e5190 head: 0000000000000000 ffff888019789200 00000009ffffffff ffff88801d8b4000 page dumped because: bad pte page_owner tracks the page as allocated page last allocated via order 2, migratetype Movable, gfp_mask 0x152c4a(GFP_NOFS|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE), pid 5453, tgid 5452 (syz-executor.0), ts 76204282340, free_ts 15924727179 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1536 prep_new_page mm/page_alloc.c:1543 [inline] get_page_from_freelist+0x31db/0x3360 mm/page_alloc.c:3170 __alloc_pages+0x255/0x670 mm/page_alloc.c:4426 folio_alloc+0x1e/0x60 mm/mempolicy.c:2308 filemap_alloc_folio+0xde/0x500 mm/filemap.c:976 ra_alloc_folio mm/readahead.c:468 [inline] page_cache_ra_order+0x423/0xcc0 mm/readahead.c:524 do_sync_mmap_readahead+0x444/0x850 filemap_fault+0x7d3/0x1710 mm/filemap.c:3291 __xfs_filemap_fault+0x286/0x960 fs/xfs/xfs_file.c:1354 __do_fault+0x133/0x4e0 mm/memory.c:4204 do_read_fault mm/memory.c:4568 [inline] do_fault mm/memory.c:4705 [inline] do_pte_missing mm/memory.c:3669 [inline] handle_pte_fault mm/memory.c:4978 [inline] __handle_mm_fault mm/memory.c:5119 [inline] handle_mm_fault+0x48d2/0x6200 mm/memory.c:5284 faultin_page mm/gup.c:956 [inline] __get_user_pages+0x6bd/0x15e0 mm/gup.c:1239 __get_user_pages_locked mm/gup.c:1504 [inline] get_dump_page+0x146/0x2b0 mm/gup.c:2018 dump_user_range+0x126/0x910 fs/coredump.c:913 elf_core_dump+0x3b75/0x4490 fs/binfmt_elf.c:2142 do_coredump+0x1b73/0x2ab0 fs/coredump.c:764 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1136 [inline] free_unref_page_prepare+0x8c3/0x9f0 mm/page_alloc.c:2312 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2405 free_contig_range+0x9e/0x150 mm/page_alloc.c:6342 destroy_args+0x95/0x7c0 mm/debug_vm_pgtable.c:1028 debug_vm_pgtable+0x4ac/0x540 mm/debug_vm_pgtable.c:1408 do_one_initcall+0x23d/0x7d0 init/main.c:1232 do_initcall_level+0x157/0x210 init/main.c:1294 do_initcalls+0x3f/0x80 init/main.c:1310 kernel_init_freeable+0x440/0x5d0 init/main.c:1547 kernel_init+0x1d/0x2a0 init/main.c:1437 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 addr:0000000020006000 vm_flags:080000d0 anon_vma:0000000000000000 mapping:ffff8880766e5190 index:5 file:bus fault:xfs_filemap_fault mmap:xfs_file_mmap read_folio:xfs_vm_read_folio CPU: 1 PID: 5453 Comm: syz-executor.0 Not tainted 6.5.0-syzkaller-12921-ga3c57ab79a06-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_bad_pte+0x581/0x5c0 mm/memory.c:535 zap_pte_range mm/memory.c:1458 [inline] zap_pmd_range mm/memory.c:1573 [inline] zap_pud_range mm/memory.c:1602 [inline] zap_p4d_range mm/memory.c:1623 [inline] unmap_page_range+0x1a76/0x3300 mm/memory.c:1644 unmap_vmas+0x209/0x3a0 mm/memory.c:1731 exit_mmap+0x297/0xc50 mm/mmap.c:3210 __mmput+0x115/0x3c0 kernel/fork.c:1349 exit_mm+0x21f/0x300 kernel/exit.c:567 do_exit+0x612/0x2290 kernel/exit.c:861 do_group_exit+0x206/0x2c0 kernel/exit.c:1024 get_signal+0x175d/0x1840 kernel/signal.c:2892 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:296 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f4cbf47cae9 Code: Unable to access opcode bytes at 0x7f4cbf47cabf. RSP: 002b:00007f4cc01920c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffe5 RBX: 00007f4cbf59bf80 RCX: 00007f4cbf47cae9 RDX: 0000000000000002 RSI: 0000000020000300 RDI: 0000000000000007 RBP: 00007f4cbf4c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000008800000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f4cbf59bf80 R15: 00007fff582f4a98 </TASK> BUG: Bad page map in process syz-executor.0 pte:fffff9b7dd120 pmd:1ce8f067 page:ffffea0001920880 refcount:9 mapcount:-1 mapping:ffff8880766e5190 index:0x2 pfn:0x64822 head:ffffea0001920800 order:2 entire_mapcount:0 nr_pages_mapped:8388606 pincount:0 memcg:ffff88801d8b4000 aops:xfs_address_space_operations ino:244a dentry name:"bus" flags: 0xfff0000000816c(referenced|uptodate|lru|active|private|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000000 ffffea0001920801 ffffea0001920890 ffffea0001920890 raw: 0000000000000001 0000000000000000 00000000fffffffe 0000000000000000 head: 00fff0000000816c ffffea0001a08288 ffff88807acd1030 ffff8880766e5190 head: 0000000000000000 ffff888019789200 00000009ffffffff ffff88801d8b4000 page dumped because: bad pte page_owner tracks the page as allocated page last allocated via order 2, migratetype Movable, gfp_mask 0x152c4a(GFP_NOFS|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE), pid 5453, tgid 5452 (syz-executor.0), ts 76204282340, free_ts 15924721374 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1536 prep_new_page mm/page_alloc.c:1543 [inline] get_page_from_freelist+0x31db/0x3360 mm/page_alloc.c:3170 __alloc_pages+0x255/0x670 mm/page_alloc.c:4426 folio_alloc+0x1e/0x60 mm/mempolicy.c:2308 filemap_alloc_folio+0xde/0x500 mm/filemap.c:976 ra_alloc_folio mm/readahead.c:468 [inline] page_cache_ra_order+0x423/0xcc0 mm/readahead.c:524 do_sync_mmap_readahead+0x444/0x850 filemap_fault+0x7d3/0x1710 mm/filemap.c:3291 __xfs_filemap_fault+0x286/0x960 fs/xfs/xfs_file.c:1354 __do_fault+0x133/0x4e0 mm/memory.c:4204 do_read_fault mm/memory.c:4568 [inline] do_fault mm/memory.c:4705 [inline] do_pte_missing mm/memory.c:3669 [inline] handle_pte_fault mm/memory.c:4978 [inline] __handle_mm_fault mm/memory.c:5119 [inline] handle_mm_fault+0x48d2/0x6200 mm/memory.c:5284 faultin_page mm/gup.c:956 [inline] __get_user_pages+0x6bd/0x15e0 mm/gup.c:1239 __get_user_pages_locked mm/gup.c:1504 [inline] get_dump_page+0x146/0x2b0 mm/gup.c:2018 dump_user_range+0x126/0x910 fs/coredump.c:913 elf_core_dump+0x3b75/0x4490 fs/binfmt_elf.c:2142 do_coredump+0x1b73/0x2ab0 fs/coredump.c:764 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1136 [inline] free_unref_page_prepare+0x8c3/0x9f0 mm/page_alloc.c:2312 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2405 free_contig_range+0x9e/0x150 mm/page_alloc.c:6342 destroy_args+0x95/0x7c0 mm/debug_vm_pgtable.c:1028 debug_vm_pgtable+0x4ac/0x540 mm/debug_vm_pgtable.c:1408 do_one_initcall+0x23d/0x7d0 init/main.c:1232 do_initcall_level+0x157/0x210 init/main.c:1294 do_initcalls+0x3f/0x80 init/main.c:1310 kernel_init_freeable+0x440/0x5d0 init/main.c:1547 kernel_init+0x1d/0x2a0 init/main.c:1437 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 addr:0000000020007000 vm_flags:080000d0 anon_vma:0000000000000000 mapping:ffff8880766e5190 index:6 file:bus fault:xfs_filemap_fault mmap:xfs_file_mmap read_folio:xfs_vm_read_folio CPU: 0 PID: 5453 Comm: syz-executor.0 Tainted: G B 6.5.0-syzkaller-12921-ga3c57ab79a06-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_bad_pte+0x581/0x5c0 mm/memory.c:535 zap_pte_range mm/memory.c:1458 [inline] zap_pmd_range mm/memory.c:1573 [inline] zap_pud_range mm/memory.c:1602 [inline] zap_p4d_range mm/memory.c:1623 [inline] unmap_page_range+0x1a76/0x3300 mm/memory.c:1644 unmap_vmas+0x209/0x3a0 mm/memory.c:1731 exit_mmap+0x297/0xc50 mm/mmap.c:3210 __mmput+0x115/0x3c0 kernel/fork.c:1349 exit_mm+0x21f/0x300 kernel/exit.c:567 do_exit+0x612/0x2290 kernel/exit.c:861 do_group_exit+0x206/0x2c0 kernel/exit.c:1024 get_signal+0x175d/0x1840 kernel/signal.c:2892 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:296 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f4cbf47cae9 Code: Unable to access opcode bytes at 0x7f4cbf47cabf. RSP: 002b:00007f4cc01920c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffe5 RBX: 00007f4cbf59bf80 RCX: 00007f4cbf47cae9 RDX: 0000000000000002 RSI: 0000000020000300 RDI: 0000000000000007 RBP: 00007f4cbf4c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000008800000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f4cbf59bf80 R15: 00007fff582f4a98 </TASK> BUG: Bad page map in process syz-executor.0 pte:fffff9b7de120 pmd:1ce8f067 page:ffffea0001920840 refcount:9 mapcount:-1 mapping:ffff8880766e5190 index:0x1 pfn:0x64821 head:ffffea0001920800 order:2 entire_mapcount:0 nr_pages_mapped:8388605 pincount:0 memcg:ffff88801d8b4000 aops:xfs_address_space_operations ino:244a dentry name:"bus" flags: 0xfff0000000816c(referenced|uptodate|lru|active|private|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000202 ffffea0001920801 dead000000000122 fffffffdffffffff raw: 0000000400000000 0000000000000000 00000000fffffffe 0000000000000000 head: 00fff0000000816c ffffea0001a08288 ffff88807acd1030 ffff8880766e5190 head: 0000000000000000 ffff888019789200 00000009ffffffff ffff88801d8b4000 page dumped because: bad pte page_owner tracks the page as allocated page last allocated via order 2, migratetype Movable, gfp_mask 0x152c4a(GFP_NOFS|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE), pid 5453, tgid 5452 (syz-executor.0), ts 76204282340, free_ts 15924715505 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1536 prep_new_page mm/page_alloc.c:1543 [inline] get_page_from_freelist+0x31db/0x3360 mm/page_alloc.c:3170 __alloc_pages+0x255/0x670 mm/page_alloc.c:4426 folio_alloc+0x1e/0x60 mm/mempolicy.c:2308 filemap_alloc_folio+0xde/0x500 mm/filemap.c:976 ra_alloc_folio mm/readahead.c:468 [inline] page_cache_ra_order+0x423/0xcc0 mm/readahead.c:524 do_sync_mmap_readahead+0x444/0x850 filemap_fault+0x7d3/0x1710 mm/filemap.c:3291 __xfs_filemap_fault+0x286/0x960 fs/xfs/xfs_file.c:1354 __do_fault+0x133/0x4e0 mm/memory.c:4204 do_read_fault mm/memory.c:4568 [inline] do_fault mm/memory.c:4705 [inline] do_pte_missing mm/memory.c:3669 [inline] handle_pte_fault mm/memory.c:4978 [inline] __handle_mm_fault mm/memory.c:5119 [inline] handle_mm_fault+0x48d2/0x6200 mm/memory.c:5284 faultin_page mm/gup.c:956 [inline] __get_user_pages+0x6bd/0x15e0 mm/gup.c:1239 __get_user_pages_locked mm/gup.c:1504 [inline] get_dump_page+0x146/0x2b0 mm/gup.c:2018 dump_user_range+0x126/0x910 fs/coredump.c:913 elf_core_dump+0x3b75/0x4490 fs/binfmt_elf.c:2142 do_coredump+0x1b73/0x2ab0 fs/coredump.c:764 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1136 [inline] free_unref_page_prepare+0x8c3/0x9f0 mm/page_alloc.c:2312 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2405 free_contig_range+0x9e/0x150 mm/page_alloc.c:6342 destroy_args+0x95/0x7c0 mm/debug_vm_pgtable.c:1028 debug_vm_pgtable+0x4ac/0x540 mm/debug_vm_pgtable.c:1408 do_one_initcall+0x23d/0x7d0 init/main.c:1232 do_initcall_level+0x157/0x210 init/main.c:1294 do_initcalls+0x3f/0x80 init/main.c:1310 kernel_init_freeable+0x440/0x5d0 init/main.c:1547 kernel_init+0x1d/0x2a0 init/main.c:1437 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 addr:0000000020008000 vm_flags:080000d0 anon_vma:0000000000000000 mapping:ffff8880766e5190 index:7 file:bus fault:xfs_filemap_fault mmap:xfs_file_mmap read_folio:xfs_vm_read_folio CPU: 1 PID: 5453 Comm: syz-executor.0 Tainted: G B 6.5.0-syzkaller-12921-ga3c57ab79a06-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_bad_pte+0x581/0x5c0 mm/memory.c:535 zap_pte_range mm/memory.c:1458 [inline] zap_pmd_range mm/memory.c:1573 [inline] zap_pud_range mm/memory.c:1602 [inline] zap_p4d_range mm/memory.c:1623 [inline] unmap_page_range+0x1a76/0x3300 mm/memory.c:1644 unmap_vmas+0x209/0x3a0 mm/memory.c:1731 exit_mmap+0x297/0xc50 mm/mmap.c:3210 __mmput+0x115/0x3c0 kernel/fork.c:1349 exit_mm+0x21f/0x300 kernel/exit.c:567 do_exit+0x612/0x2290 kernel/exit.c:861 do_group_exit+0x206/0x2c0 kernel/exit.c:1024 get_signal+0x175d/0x1840 kernel/signal.c:2892 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:296 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f4cbf47cae9 Code: Unable to access opcode bytes at 0x7f4cbf47cabf. RSP: 002b:00007f4cc01920c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffe5 RBX: 00007f4cbf59bf80 RCX: 00007f4cbf47cae9 RDX: 0000000000000002 RSI: 0000000020000300 RDI: 0000000000000007 RBP: 00007f4cbf4c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000008800000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f4cbf59bf80 R15: 00007fff582f4a98 </TASK> Tested on: commit: a3c57ab7 iov_iter: Kunit tests for page extraction git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16a308d8680000 kernel config: https://syzkaller.appspot.com/x/.config?x=50ac7dadde9e1c0e dashboard link: https://syzkaller.appspot.com/bug?extid=55cc72f8cc3a549119df compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=1037a92c680000
