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BUG: KASAN: use-after-free in alloc_branch fs/minix/itree_common.c:92 [inline]
BUG: KASAN: use-after-free in get_block+0xbaa/0x1600 fs/minix/itree_common.c:191
Write of size 2 at addr ffff88808aace7b8 by task syz-executor790/6997

CPU: 1 PID: 6997 Comm: syz-executor790 Not tainted 5.7.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1e9/0x30e lib/dump_stack.c:118
 print_address_description+0x74/0x5c0 mm/kasan/report.c:382
 __kasan_report+0x103/0x1a0 mm/kasan/report.c:511
 kasan_report+0x4d/0x80 mm/kasan/common.c:625

The buggy address belongs to the page:
page:ffffea00022ab380 refcount:0 mapcount:0 mapping:0000000062ebaeff index:0x1
flags: 0xfffe0000000000()
raw: 00fffe0000000000 ffffea0002343488 ffffea00022ab3c8 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88808aace680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88808aace700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88808aace780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                        ^
 ffff88808aace800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88808aace880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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