loop5: detected capacity change from 0 to 2048
EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 without journal. Quota mode: none.
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BUG: KCSAN: data-race in __mark_inode_dirty / writeback_single_inode

write to 0xffff88810a5c7b60 of 8 bytes by task 27549 on cpu 1:
 writeback_single_inode+0x10e/0x4a0 fs/fs-writeback.c:1718
 sync_inode_metadata+0x56/0x80 fs/fs-writeback.c:2777
 ext4_fsync_nojournal fs/ext4/fsync.c:92 [inline]
 ext4_sync_file+0x356/0x720 fs/ext4/fsync.c:170
 vfs_fsync_range+0x10b/0x120 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2452 [inline]
 ext4_buffered_write_iter+0x397/0x3e0 fs/ext4/file.c:296
 ext4_file_write_iter+0xd7/0x10e0
 do_iter_write+0x418/0x700 fs/read_write.c:861
 vfs_iter_write+0x50/0x70 fs/read_write.c:902
 iter_file_splice_write+0x456/0x7d0 fs/splice.c:778
 do_splice_from fs/splice.c:856 [inline]
 direct_splice_actor+0x84/0xa0 fs/splice.c:1022
 splice_direct_to_actor+0x2ee/0x5f0 fs/splice.c:977
 do_splice_direct+0x104/0x180 fs/splice.c:1065
 do_sendfile+0x3b8/0x950 fs/read_write.c:1255
 __do_sys_sendfile64 fs/read_write.c:1323 [inline]
 __se_sys_sendfile64 fs/read_write.c:1309 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1309
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88810a5c7b60 of 8 bytes by task 27529 on cpu 0:
 __mark_inode_dirty+0x199/0x7d0 fs/fs-writeback.c:2443
 mark_inode_dirty include/linux/fs.h:2127 [inline]
 ext4_write_inline_data_end+0x6b3/0xad0 fs/ext4/inline.c:792
 ext4_write_end+0x3ca/0x7f0 fs/ext4/inode.c:1320
 ext4_da_write_end+0x6e/0x630 fs/ext4/inode.c:3141
 generic_perform_write+0x253/0x3d0 mm/filemap.c:3937
 ext4_buffered_write_iter+0x234/0x3e0 fs/ext4/file.c:289
 ext4_file_write_iter+0xd7/0x10e0
 do_iter_write+0x418/0x700 fs/read_write.c:861
 vfs_iter_write+0x50/0x70 fs/read_write.c:902
 iter_file_splice_write+0x456/0x7d0 fs/splice.c:778
 do_splice_from fs/splice.c:856 [inline]
 direct_splice_actor+0x84/0xa0 fs/splice.c:1022
 splice_direct_to_actor+0x2ee/0x5f0 fs/splice.c:977
 do_splice_direct+0x104/0x180 fs/splice.c:1065
 do_sendfile+0x3b8/0x950 fs/read_write.c:1255
 __do_sys_sendfile64 fs/read_write.c:1323 [inline]
 __se_sys_sendfile64 fs/read_write.c:1309 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1309
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000000007 -> 0x0000000000000080

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 27529 Comm: syz-executor.5 Not tainted 6.3.0-rc7-syzkaller-00043-gaf67688dca57 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
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