==================================================================
BUG: KASAN: slab-out-of-bounds in crc16+0x235/0x2d0 lib/crc16.c:58
Read of size 1 at addr ffff888111ea9040 by task syz-executor.3/20360

CPU: 1 PID: 20360 Comm: syz-executor.3 Not tainted 5.10.161-syzkaller-00019-g416c4356f372 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
 print_address_description+0x81/0x3c0 mm/kasan/report.c:233
 __kasan_report mm/kasan/report.c:419 [inline]
 kasan_report+0x1a4/0x1f0 mm/kasan/report.c:436
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306
 crc16+0x235/0x2d0 lib/crc16.c:58
 ext4_group_desc_csum+0x851/0xb50 fs/ext4/super.c:2850
 ext4_group_desc_csum_set+0x1d6/0x270 fs/ext4/super.c:2873
 ext4_free_blocks+0x1b9e/0x2ad0 fs/ext4/mballoc.c:5527
 ext4_remove_blocks+0xaf1/0x1180 fs/ext4/extents.c:2520
 ext4_ext_rm_leaf+0xaa8/0x18c0 fs/ext4/extents.c:2704
 ext4_ext_remove_space+0xf25/0x22a0 fs/ext4/extents.c:2952
 ext4_ext_truncate+0x18a/0x210 fs/ext4/extents.c:4413
 ext4_truncate+0xba0/0x1270 fs/ext4/inode.c:4356
 ext4_evict_inode+0xf1e/0x1730 fs/ext4/inode.c:288
 evict+0x2a3/0x6c0 fs/inode.c:577
 iput_final fs/inode.c:1655 [inline]
 iput+0x61f/0x7d0 fs/inode.c:1681
 do_unlinkat+0x51a/0x920 fs/namei.c:3982
 __do_sys_unlink fs/namei.c:4022 [inline]
 __se_sys_unlink fs/namei.c:4020 [inline]
 __x64_sys_unlink+0x49/0x50 fs/namei.c:4020
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7fcf6945e0f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcf68fd1168 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 00007fcf6957df80 RCX: 00007fcf6945e0f9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000000
RBP: 00007fcf694b9ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffce4ffd77f R14: 00007fcf68fd1300 R15: 0000000000022000

Allocated by task 160:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:428 [inline]
 __kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:461
 kasan_slab_alloc include/linux/kasan.h:259 [inline]
 slab_post_alloc_hook include/../mm/slab.h:583 [inline]
 slab_alloc_node mm/slub.c:2956 [inline]
 slab_alloc mm/slub.c:2964 [inline]
 kmem_cache_alloc+0x16c/0x300 mm/slub.c:2969
 anon_vma_chain_alloc mm/rmap.c:138 [inline]
 anon_vma_fork+0x1b9/0x4f0 mm/rmap.c:359
 dup_mmap+0x7b1/0xf60 kernel/fork.c:558
 dup_mm+0x91/0x320 kernel/fork.c:1412
 copy_mm+0x108/0x1b0 kernel/fork.c:1468
 copy_process+0x133a/0x33a0 kernel/fork.c:2152
 kernel_clone+0x22d/0x900 kernel/fork.c:2524
 __do_sys_clone kernel/fork.c:2643 [inline]
 __se_sys_clone kernel/fork.c:2627 [inline]
 __x64_sys_clone+0x271/0x2e0 kernel/fork.c:2627
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xc6

The buggy address belongs to the object at ffff888111ea9000
 which belongs to the cache anon_vma_chain of size 64
The buggy address is located 0 bytes to the right of
 64-byte region [ffff888111ea9000, ffff888111ea9040)
The buggy address belongs to the page:
page:ffffea000447aa40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x111ea9
flags: 0x8000000000000200(slab)
raw: 8000000000000200 ffffea000447a900 0000001000000010 ffff888100066d80
raw: 0000000000000000 00000000002a002a 00000001ffffffff 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 0x12800(GFP_NOWAIT|__GFP_NOWARN|__GFP_NORETRY), pid 170, ts 3686170709, free_ts 0
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2386 [inline]
 prep_new_page mm/page_alloc.c:2392 [inline]
 get_page_from_freelist+0x755/0x810 mm/page_alloc.c:4073
 __alloc_pages_nodemask+0x3b6/0x890 mm/page_alloc.c:5160
 alloc_slab_page mm/slub.c:1815 [inline]
 allocate_slab+0x78/0x540 mm/slub.c:1817
 new_slab mm/slub.c:1878 [inline]
 new_slab_objects mm/slub.c:2636 [inline]
 ___slab_alloc+0x131/0x2e0 mm/slub.c:2800
 __slab_alloc+0x63/0xa0 mm/slub.c:2840
 slab_alloc_node mm/slub.c:2922 [inline]
 slab_alloc mm/slub.c:2964 [inline]
 kmem_cache_alloc+0x1ef/0x300 mm/slub.c:2969
 anon_vma_chain_alloc mm/rmap.c:138 [inline]
 anon_vma_clone+0xa1/0x4f0 mm/rmap.c:284
 anon_vma_fork+0x91/0x4f0 mm/rmap.c:347
 dup_mmap+0x7b1/0xf60 kernel/fork.c:558
 dup_mm+0x91/0x320 kernel/fork.c:1412
 copy_mm+0x108/0x1b0 kernel/fork.c:1468
 copy_process+0x133a/0x33a0 kernel/fork.c:2152
 kernel_clone+0x22d/0x900 kernel/fork.c:2524
 __do_sys_clone kernel/fork.c:2643 [inline]
 __se_sys_clone kernel/fork.c:2627 [inline]
 __x64_sys_clone+0x271/0x2e0 kernel/fork.c:2627
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xc6
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888111ea8f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888111ea8f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888111ea9000: 00 00 00 00 00 00 00 00 fc fc fc fc 00 00 00 00
                                           ^
 ffff888111ea9080: 00 00 00 00 fc fc fc fc 00 00 00 00 00 00 00 00
 ffff888111ea9100: fc fc fc fc 00 00 00 00 00 00 00 00 fc fc fc fc
==================================================================