================================================================== 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 ffff88807eec2a88 by task syz-executor.0/8789 CPU: 0 PID: 8789 Comm: syz-executor.0 Not tainted 5.19.0-rc4-next-20220628-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 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/0x719 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+0x1ec/0x720 mm/mmap.c:3210 __mmput+0x128/0x4c0 kernel/fork.c:1180 mmput+0x5c/0x70 kernel/fork.c:1201 exit_mm kernel/exit.c:510 [inline] do_exit+0xa09/0x29f0 kernel/exit.c:782 do_group_exit+0xd2/0x2f0 kernel/exit.c:925 __do_sys_exit_group kernel/exit.c:936 [inline] __se_sys_exit_group kernel/exit.c:934 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:934 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 RIP: 0033:0x7f62b1e89209 Code: Unable to access opcode bytes at RIP 0x7f62b1e891df. RSP: 002b:00007fffcd4fe1c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00007f62b1e89209 RDX: 00007f62b1e3be4b RSI: ffffffffffffffb8 RDI: 0000000000000000 RBP: 0000000000000000 R08: 00007f62b1fa01d0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007fffcd4fe2b0 Allocated by task 8790: 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+0x2d6/0x4c0 mm/slub.c:3268 vm_area_dup+0x81/0x380 kernel/fork.c:466 copy_vma+0x36f/0x890 mm/mmap.c:3325 move_vma+0x449/0xf60 mm/mremap.c:626 __do_sys_mremap+0x480/0x16a0 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 8790: 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+0xeb/0x5b0 mm/slub.c:3551 copy_vma+0x6ac/0x890 mm/mmap.c:3352 move_vma+0x449/0xf60 mm/mremap.c:626 __do_sys_mremap+0x480/0x16a0 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 ffff88807eec2a20 which belongs to the cache vm_area_struct of size 152 The buggy address is located 104 bytes inside of 152-byte region [ffff88807eec2a20, ffff88807eec2ab8) The buggy address belongs to the physical page: page:ffffea0001fbb080 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7eec2 memcg:ffff888021a01001 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 0000000000000000 dead000000000001 ffff8880119dbb40 raw: 0000000000000000 0000000080120012 00000001ffffffff ffff888021a01001 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 3630, tgid 3630 (syz-executor.5), ts 1563064176597, free_ts 1563054158506 prep_new_page mm/page_alloc.c:2535 [inline] get_page_from_freelist+0x210d/0x3a30 mm/page_alloc.c:4282 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5506 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2280 alloc_slab_page mm/slub.c:1824 [inline] allocate_slab+0x27e/0x3d0 mm/slub.c:1969 new_slab mm/slub.c:2029 [inline] ___slab_alloc+0x89d/0xef0 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+0x3fb/0x4c0 mm/slub.c:3268 vm_area_dup+0x81/0x380 kernel/fork.c:466 dup_mmap+0x642/0x1070 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:1453 [inline] free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1503 free_unref_page_prepare mm/page_alloc.c:3383 [inline] free_unref_page+0x19/0x4d0 mm/page_alloc.c:3479 __vunmap+0x85d/0xd30 mm/vmalloc.c:2696 free_work+0x58/0x70 mm/vmalloc.c:97 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 Memory state around the buggy address: ffff88807eec2980: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff88807eec2a00: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb >ffff88807eec2a80: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc 00 ^ ffff88807eec2b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807eec2b80: 00 00 fc fc fc fc fc fc fc fc 00 00 00 00 00 00 ==================================================================