================================================================== BUG: KASAN: slab-use-after-free in __lock_acquire+0x78/0x2100 kernel/locking/lockdep.c:5089 Read of size 8 at addr ffff8880304e63d8 by task syz.3.42/6057 CPU: 1 UID: 0 PID: 6057 Comm: syz.3.42 Not tainted 6.13.0-rc1-next-20241205-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x169/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 __lock_acquire+0x78/0x2100 kernel/locking/lockdep.c:5089 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] move_pages_pte+0x8aa/0x3400 mm/userfaultfd.c:1248 move_pages+0xe75/0x16a0 mm/userfaultfd.c:1754 userfaultfd_move fs/userfaultfd.c:1899 [inline] userfaultfd_ioctl+0x5221/0x6840 fs/userfaultfd.c:2022 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1041f7ff19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1042e2a058 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f1042145fa0 RCX: 00007f1041f7ff19 RDX: 0000000020000080 RSI: 00000000c028aa05 RDI: 0000000000000003 RBP: 00007f1041ff3986 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f1042145fa0 R15: 00007ffd83ea4978 Allocated by task 6056: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4104 [inline] slab_alloc_node mm/slub.c:4153 [inline] kmem_cache_alloc_noprof+0x1d9/0x380 mm/slub.c:4160 ptlock_alloc+0x20/0x70 mm/memory.c:7026 ptlock_init include/linux/mm.h:2971 [inline] pagetable_pte_ctor include/linux/mm.h:2998 [inline] __pte_alloc_one_noprof include/asm-generic/pgalloc.h:73 [inline] pte_alloc_one+0xd3/0x510 arch/x86/mm/pgtable.c:41 __do_huge_pmd_anonymous_page mm/huge_memory.c:1229 [inline] do_huge_pmd_anonymous_page+0x2fb/0xb30 mm/huge_memory.c:1374 create_huge_pmd mm/memory.c:5737 [inline] __handle_mm_fault mm/memory.c:5986 [inline] handle_mm_fault+0x15a7/0x1bb0 mm/memory.c:6183 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x459/0x8b0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 Freed by task 6063: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2338 [inline] slab_free mm/slub.c:4598 [inline] kmem_cache_free+0x195/0x410 mm/slub.c:4700 pagetable_pte_dtor include/linux/mm.h:3009 [inline] ___pte_free_tlb+0x2b/0x140 arch/x86/mm/pgtable.c:63 __pte_free_tlb arch/x86/include/asm/pgalloc.h:61 [inline] free_pte+0x142/0x190 mm/pt_reclaim.c:31 zap_pte_range mm/memory.c:1780 [inline] zap_pmd_range mm/memory.c:1822 [inline] zap_pud_range mm/memory.c:1851 [inline] zap_p4d_range mm/memory.c:1872 [inline] unmap_page_range+0x4062/0x48d0 mm/memory.c:1893 zap_page_range_single+0x45c/0x630 mm/memory.c:2018 madvise_dontneed_single_vma mm/madvise.c:859 [inline] madvise_dontneed_free mm/madvise.c:940 [inline] madvise_vma_behavior mm/madvise.c:1270 [inline] madvise_walk_vmas mm/madvise.c:1502 [inline] do_madvise+0x2774/0x4d90 mm/madvise.c:1689 __do_sys_madvise mm/madvise.c:1705 [inline] __se_sys_madvise mm/madvise.c:1703 [inline] __x64_sys_madvise+0xa6/0xc0 mm/madvise.c:1703 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880304e63c0 which belongs to the cache page->ptl of size 64 The buggy address is located 24 bytes inside of freed 64-byte region [ffff8880304e63c0, ffff8880304e6400) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x304e6 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801ac4f780 ffffea0000d04c80 dead000000000004 raw: 0000000000000000 00000000802a002a 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5186, tgid 5186 (start-stop-daem), ts 24058641646, free_ts 22826393913 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1549 prep_new_page mm/page_alloc.c:1557 [inline] get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3475 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4752 alloc_pages_mpol+0x30e/0x550 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:2408 [inline] allocate_slab+0x8f/0x3a0 mm/slub.c:2574 new_slab mm/slub.c:2627 [inline] ___slab_alloc+0xc27/0x14a0 mm/slub.c:3815 __slab_alloc+0x58/0xa0 mm/slub.c:3905 __slab_alloc_node mm/slub.c:3980 [inline] slab_alloc_node mm/slub.c:4141 [inline] kmem_cache_alloc_noprof+0x268/0x380 mm/slub.c:4160 ptlock_alloc mm/memory.c:7026 [inline] ptlock_init include/linux/mm.h:2971 [inline] pmd_ptlock_init include/linux/mm.h:3078 [inline] pagetable_pmd_ctor include/linux/mm.h:3116 [inline] pmd_alloc_one_noprof include/asm-generic/pgalloc.h:141 [inline] __pmd_alloc+0x10b/0x670 mm/memory.c:6436 pmd_alloc include/linux/mm.h:2862 [inline] __handle_mm_fault mm/memory.c:5975 [inline] handle_mm_fault+0xf76/0x1bb0 mm/memory.c:6183 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x459/0x8b0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0xe0d/0x10e0 mm/page_alloc.c:2658 kasan_depopulate_vmalloc_pte+0x74/0x90 mm/kasan/shadow.c:408 apply_to_pte_range mm/memory.c:2900 [inline] apply_to_pmd_range mm/memory.c:2944 [inline] apply_to_pud_range mm/memory.c:2980 [inline] apply_to_p4d_range mm/memory.c:3016 [inline] __apply_to_page_range+0x806/0xde0 mm/memory.c:3050 kasan_release_vmalloc+0xa5/0xd0 mm/kasan/shadow.c:529 kasan_release_vmalloc_node mm/vmalloc.c:2196 [inline] purge_vmap_node+0x22f/0x8d0 mm/vmalloc.c:2213 __purge_vmap_area_lazy+0x708/0xae0 mm/vmalloc.c:2304 _vm_unmap_aliases+0x79d/0x840 mm/vmalloc.c:2899 change_page_attr_set_clr+0x2fe/0xdb0 arch/x86/mm/pat/set_memory.c:1881 change_page_attr_set arch/x86/mm/pat/set_memory.c:1922 [inline] set_memory_nx+0xf2/0x130 arch/x86/mm/pat/set_memory.c:2110 free_init_pages arch/x86/mm/init.c:929 [inline] free_kernel_image_pages arch/x86/mm/init.c:948 [inline] free_initmem+0x79/0x110 arch/x86/mm/init.c:975 kernel_init+0x31/0x2b0 init/main.c:1475 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff8880304e6280: fc fc fc fc 00 00 00 00 00 00 00 00 fc fc fc fc ffff8880304e6300: fa fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb >ffff8880304e6380: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb ^ ffff8880304e6400: fc fc fc fc fa fb fb fb fb fb fb fb fc fc fc fc ffff8880304e6480: 00 00 00 00 00 00 00 00 fc fc fc fc 00 00 00 00 ==================================================================