EXT4-fs error (device loop0): ext4_check_bdev_write_error:235: comm syz.0.0: Error while async write back metadata
==================================================================
BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x92b/0x1ed0 fs/ext4/xattr.c:1767
Read of size 18446744073709551600 at addr ffff88804f01feb8 by task syz.0.0/5323

CPU: 0 UID: 0 PID: 5323 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200
 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94
 ext4_xattr_set_entry+0x92b/0x1ed0 fs/ext4/xattr.c:1767
 ext4_xattr_ibody_set+0x262/0x710 fs/ext4/xattr.c:2277
 ext4_destroy_inline_data_nolock+0x23a/0x5f0 fs/ext4/inline.c:471
 ext4_destroy_inline_data+0x83/0xe0 fs/ext4/inline.c:1824
 ext4_do_writepages+0x50a/0x4770 fs/ext4/inode.c:2817
 ext4_writepages+0x241/0x3b0 fs/ext4/inode.c:3032
 do_writepages+0x338/0x560 mm/page-writeback.c:2560
 filemap_writeback mm/filemap.c:387 [inline]
 filemap_flush_range mm/filemap.c:436 [inline]
 filemap_flush+0x1e1/0x2e0 mm/filemap.c:451
 ext4_release_file+0x82/0x310 fs/ext4/file.c:171
 __fput+0x418/0xa50 fs/file_table.c:512
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
 exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
 do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fce7f59e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc1cb35f58 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffc1cb36040 RCX: 00007fce7f59e159
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 0000000000016f27 R08: 0000000000000001 R09: 0000000000000000
R10: 00007fce7f3ff030 R11: 0000000000000246 R12: 00007ffc1cb36080
R13: 00007fce7f825fac R14: 000000000001707d R15: 00007fce7f825fa0
 </TASK>

The buggy address belongs to the physical page:
page: refcount:3 mapcount:0 mapping:ffff88801d025940 index:0x2 pfn:0x4f01f
memcg:ffff88803c59d300
aops:def_blk_aops ino:700000 dentry name(?):""
flags: 0x4fff18000004004(referenced|private|node=1|zone=1|lastcpupid=0x7ff)
raw: 04fff18000004004 0000000000000000 dead000000000122 ffff88801d025940
raw: 0000000000000002 ffff888013005540 00000003ffffffff ffff88803c59d300
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Movable, gfp_mask 0x148c48(GFP_NOFS|__GFP_MOVABLE|__GFP_NOFAIL|__GFP_COMP|__GFP_HARDWALL), pid 5323, tgid 5323 (syz.0.0), ts 94456415670
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871
 prep_new_page mm/page_alloc.c:1879 [inline]
 get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943
 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436
 alloc_pages_mpol+0x21e/0x390 mm/mempolicy.c:2486
 alloc_frozen_pages_noprof mm/mempolicy.c:2557 [inline]
 alloc_pages_noprof+0xb1/0x2b0 mm/mempolicy.c:2577
 folio_alloc_noprof+0x1e/0x30 mm/mempolicy.c:2587
 filemap_alloc_folio_noprof+0x111/0x460 mm/filemap.c:1019
 __filemap_get_folio_mpol+0x402/0x1000 mm/filemap.c:2018
 __filemap_get_folio include/linux/pagemap.h:761 [inline]
 grow_dev_folio fs/buffer.c:858 [inline]
 grow_buffers fs/buffer.c:924 [inline]
 __getblk_slow fs/buffer.c:942 [inline]
 bdev_getblk+0x1f4/0x6e0 fs/buffer.c:1346
 __getblk include/linux/buffer_head.h:378 [inline]
 sb_getblk include/linux/buffer_head.h:384 [inline]
 __ext4_get_inode_loc+0x56c/0xf40 fs/ext4/inode.c:4921
 ext4_get_inode_loc+0x81/0xf0 fs/ext4/inode.c:5049
 ext4_destroy_inline_data_nolock+0x140/0x5f0 fs/ext4/inline.c:455
 ext4_destroy_inline_data+0x83/0xe0 fs/ext4/inline.c:1824
 ext4_do_writepages+0x50a/0x4770 fs/ext4/inode.c:2817
 ext4_writepages+0x241/0x3b0 fs/ext4/inode.c:3032
 do_writepages+0x338/0x560 mm/page-writeback.c:2560
page last free pid 5324 tgid 5323 ts 94439065704 stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1418 [inline]
 free_unref_folios+0xdc2/0x14e0 mm/page_alloc.c:3022
 folios_put_refs+0x9e9/0xb30 mm/folio.c:1036
 folio_batch_release include/linux/folio_batch.h:101 [inline]
 mapping_try_invalidate+0x3b7/0x4b0 mm/truncate.c:579
 loop_set_status+0x25d/0xd50 drivers/block/loop.c:1266
 loop_set_status_old drivers/block/loop.c:1382 [inline]
 lo_ioctl+0xd1c/0x2010 drivers/block/loop.c:1575
 blkdev_ioctl+0x5e3/0x740 block/ioctl.c:798
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88804f01fd80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88804f01fe00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88804f01fe80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                        ^
 ffff88804f01ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88804f01ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================