================================================================== BUG: KASAN: use-after-free in vma_last_pgoff mm/interval_tree.c:20 [inline] BUG: KASAN: use-after-free in avc_last_pgoff mm/interval_tree.c:68 [inline] BUG: KASAN: use-after-free in __anon_vma_interval_tree_augment_compute_max mm/interval_tree.c:71 [inline] BUG: KASAN: use-after-free in __anon_vma_interval_tree_augment_propagate mm/interval_tree.c:71 [inline] BUG: KASAN: use-after-free in __rb_erase_augmented include/linux/rbtree_augmented.h:295 [inline] BUG: KASAN: use-after-free in rb_erase_augmented include/linux/rbtree_augmented.h:303 [inline] BUG: KASAN: use-after-free in rb_erase_augmented_cached include/linux/rbtree_augmented.h:314 [inline] BUG: KASAN: use-after-free in __anon_vma_interval_tree_remove mm/interval_tree.c:71 [inline] BUG: KASAN: use-after-free in anon_vma_interval_tree_remove+0xc7d/0xf30 mm/interval_tree.c:88 Read of size 8 at addr ffff88807ddb9728 by task syz-executor.0/6196 CPU: 1 PID: 6196 Comm: syz-executor.0 Not tainted 5.19.0-rc3-next-20220621-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x726 mm/kasan/report.c:433 kasan_report+0xbe/0x1f0 mm/kasan/report.c:495 vma_last_pgoff mm/interval_tree.c:20 [inline] avc_last_pgoff mm/interval_tree.c:68 [inline] __anon_vma_interval_tree_augment_compute_max mm/interval_tree.c:71 [inline] __anon_vma_interval_tree_augment_propagate mm/interval_tree.c:71 [inline] __rb_erase_augmented include/linux/rbtree_augmented.h:295 [inline] rb_erase_augmented include/linux/rbtree_augmented.h:303 [inline] rb_erase_augmented_cached include/linux/rbtree_augmented.h:314 [inline] __anon_vma_interval_tree_remove mm/interval_tree.c:71 [inline] anon_vma_interval_tree_remove+0xc7d/0xf30 mm/interval_tree.c:88 unlink_anon_vmas+0x218/0x840 mm/rmap.c:406 free_pgtables+0x24d/0x420 mm/memory.c:439 exit_mmap+0x205/0x750 mm/mmap.c:3209 __mmput+0x128/0x4c0 kernel/fork.c:1180 mmput+0x5c/0x70 kernel/fork.c:1201 exit_mm kernel/exit.c:510 [inline] do_exit+0xa18/0x2a00 kernel/exit.c:782 do_group_exit+0xd2/0x2f0 kernel/exit.c:925 get_signal+0x2542/0x2600 kernel/signal.c:2857 arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop kernel/entry/common.c:166 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7fec32c89109 Code: Unable to access opcode bytes at RIP 0x7fec32c890df. RSP: 002b:00007fec33d7b218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 00007fec32d9bf68 RCX: 00007fec32c89109 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fec32d9bf6c RBP: 00007fec32d9bf60 R08: 00007ffd03b2c080 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 00007fec32d9bf6c R13: 00007ffd03b04a8f R14: 00007fec33d7b300 R15: 0000000000022000 Allocated by task 6196: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:736 [inline] slab_alloc_node mm/slub.c:3243 [inline] slab_alloc mm/slub.c:3251 [inline] __kmem_cache_alloc_lru mm/slub.c:3258 [inline] kmem_cache_alloc+0x280/0x4d0 mm/slub.c:3268 vm_area_dup+0x81/0x380 kernel/fork.c:466 copy_vma+0x36f/0x890 mm/mmap.c:3324 move_vma+0x449/0xf60 mm/mremap.c:626 __do_sys_mremap+0x48a/0x16b0 mm/mremap.c:1075 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Freed by task 6196: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x166/0x1c0 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1754 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1780 slab_free mm/slub.c:3534 [inline] kmem_cache_free+0xed/0x5b0 mm/slub.c:3551 copy_vma+0x6ac/0x890 mm/mmap.c:3351 move_vma+0x449/0xf60 mm/mremap.c:626 __do_sys_mremap+0x48a/0x16b0 mm/mremap.c:1075 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 The buggy address belongs to the object at ffff88807ddb96c0 which belongs to the cache vm_area_struct of size 152 The buggy address is located 104 bytes inside of 152-byte region [ffff88807ddb96c0, ffff88807ddb9758) The buggy address belongs to the physical page: page:ffffea0001f76e40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7ddb9 memcg:ffff88805c84a801 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea000170e800 dead000000000002 ffff888140006b40 raw: 0000000000000000 0000000000120012 00000001ffffffff ffff88805c84a801 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 3614, tgid 3614 (syz-executor.1), ts 2446832490257, free_ts 2446751849178 prep_new_page mm/page_alloc.c:2460 [inline] get_page_from_freelist+0x2043/0x3cf0 mm/page_alloc.c:4275 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5496 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2279 alloc_slab_page mm/slub.c:1824 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1969 new_slab mm/slub.c:2029 [inline] ___slab_alloc+0x99f/0xe10 mm/slub.c:3031 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3118 slab_alloc_node mm/slub.c:3209 [inline] slab_alloc mm/slub.c:3251 [inline] __kmem_cache_alloc_lru mm/slub.c:3258 [inline] kmem_cache_alloc+0x3e6/0x4d0 mm/slub.c:3268 vm_area_dup+0x81/0x380 kernel/fork.c:466 dup_mmap+0x656/0x1090 kernel/fork.c:640 dup_mm+0x91/0x370 kernel/fork.c:1520 copy_mm kernel/fork.c:1569 [inline] copy_process+0x3ca8/0x7080 kernel/fork.c:2237 kernel_clone+0xe7/0xab0 kernel/fork.c:2652 __do_sys_clone+0xba/0x100 kernel/fork.c:2786 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1375 [inline] free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1425 free_unref_page_prepare mm/page_alloc.c:3311 [inline] free_unref_page_list+0x17e/0x14f0 mm/page_alloc.c:3475 release_pages+0xbe3/0x13d0 mm/swap.c:1012 tlb_batch_pages_flush+0xa8/0x1a0 mm/mmu_gather.c:58 tlb_flush_mmu_free mm/mmu_gather.c:255 [inline] tlb_flush_mmu mm/mmu_gather.c:262 [inline] tlb_finish_mmu+0x147/0x7e0 mm/mmu_gather.c:353 exit_mmap+0x217/0x750 mm/mmap.c:3211 __mmput+0x128/0x4c0 kernel/fork.c:1180 mmput+0x5c/0x70 kernel/fork.c:1201 exit_mm kernel/exit.c:510 [inline] do_exit+0xa18/0x2a00 kernel/exit.c:782 do_group_exit+0xd2/0x2f0 kernel/exit.c:925 get_signal+0x2542/0x2600 kernel/signal.c:2857 arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop kernel/entry/common.c:166 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Memory state around the buggy address: ffff88807ddb9600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807ddb9680: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb >ffff88807ddb9700: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc ^ ffff88807ddb9780: fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807ddb9800: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc 00 00 ==================================================================