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BUG: KASAN: use-after-free in __rb_change_child include/linux/rbtree_augmented.h:173 [inline]
BUG: KASAN: use-after-free in __rb_erase_augmented include/linux/rbtree_augmented.h:227 [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 vma_interval_tree_remove+0x4f3/0xba0 mm/interval_tree.c:23
Read of size 8 at addr ffff8881c0000010 by task syz-executor.4/28817

CPU: 1 PID: 28817 Comm: syz-executor.4 Not tainted 5.15.122-syzkaller-00676-g1463976ddc64 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
 print_address_description+0x87/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:444
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309
 __rb_change_child include/linux/rbtree_augmented.h:173 [inline]
 __rb_erase_augmented include/linux/rbtree_augmented.h:227 [inline]
 rb_erase_augmented include/linux/rbtree_augmented.h:303 [inline]
 rb_erase_augmented_cached include/linux/rbtree_augmented.h:314 [inline]
 vma_interval_tree_remove+0x4f3/0xba0 mm/interval_tree.c:23
 __remove_shared_vm_struct mm/mmap.c:158 [inline]
 unlink_file_vma+0xd9/0xf0 mm/mmap.c:173
 free_pgtables+0x13f/0x280 mm/memory.c:486
 exit_mmap+0x3e7/0x6f0 mm/mmap.c:3210
 __mmput+0x95/0x310 kernel/fork.c:1171
 mmput+0x5b/0x170 kernel/fork.c:1194
 exit_mm kernel/exit.c:551 [inline]
 do_exit+0xbb4/0x2b60 kernel/exit.c:862
 __do_sys_exit kernel/exit.c:966 [inline]
 __se_sys_exit kernel/exit.c:964 [inline]
 __x64_sys_exit+0x40/0x40 kernel/exit.c:964
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f0dd4ed4ae9
Code: Unable to access opcode bytes at RIP 0x7f0dd4ed4abf.
RSP: 002b:00007f0dd3c57078 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
RAX: ffffffffffffffda RBX: 00007f0dd4ff3f80 RCX: 00007f0dd4ed4ae9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f0dd3c57120 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 000000000000000b R14: 00007f0dd4ff3f80 R15: 00007ffff9f01ac8
 </TASK>

The buggy address belongs to the page:
page:ffffea0007000000 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x0 pfn:0x1c0000
flags: 0x4000000000000000(zone=1)
raw: 4000000000000000 ffffea0007010008 ffffea0006ff0008 0000000000000000
raw: 0000000000000000 000000000000000a 00000000ffffff7f 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffff8881bfffff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881bfffff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881c0000000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                         ^
 ffff8881c0000080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881c0000100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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