syzbot

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BUG: KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode

write to 0xffff8881367bb2c0 of 8 bytes by task 8 on cpu 1:
 __writeback_single_inode+0x1f6/0x590 fs/fs-writeback.c:1623
 writeback_sb_inodes+0x6a0/0xdd0 fs/fs-writeback.c:1865
 wb_writeback+0x26b/0x650 fs/fs-writeback.c:2039
 wb_do_writeback+0x101/0x600 fs/fs-writeback.c:2182
 wb_workfn+0x88/0x260 fs/fs-writeback.c:2222
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

read to 0xffff8881367bb2c0 of 8 bytes by task 5793 on cpu 0:
 __mark_inode_dirty+0xd5/0x620 fs/fs-writeback.c:2402
 mark_inode_dirty include/linux/fs.h:2462 [inline]
 generic_write_end+0x175/0x350 fs/buffer.c:2199
 ext4_da_write_end+0x26c/0x620 fs/ext4/inode.c:3089
 generic_perform_write+0x264/0x3f0 mm/filemap.c:3749
 ext4_buffered_write_iter+0x235/0x3e0 fs/ext4/file.c:270
 ext4_file_write_iter+0x2e3/0x1210
 call_write_iter include/linux/fs.h:2187 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x468/0x760 fs/read_write.c:584
 ksys_write+0xe8/0x1a0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:646
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000020087 -> 0x0000000000020084

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 5793 Comm: syz-executor.1 Not tainted 6.0.0-rc7-syzkaller-00180-g70575e77839f-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
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