==================================================================
BUG: KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes

read to 0xffff88812b4391f0 of 8 bytes by task 31110 on cpu 0:
 __mark_inode_dirty+0xb8/0x940 fs/fs-writeback.c:2269
 mark_buffer_dirty+0x29c/0x2c0 fs/buffer.c:1116
 __ext4_handle_dirty_metadata+0x284/0x350 fs/ext4/ext4_jbd2.c:298
 ext4_do_update_inode fs/ext4/inode.c:5334 [inline]
 ext4_mark_iloc_dirty+0xdb3/0x1580 fs/ext4/inode.c:5876
 ext4_mark_inode_dirty+0xe9/0x420 fs/ext4/inode.c:6055
 ext4_ext_tree_init+0x92/0xb0 fs/ext4/extents.c:860
 __ext4_new_inode+0x2de5/0x3070 fs/ext4/ialloc.c:1169
 ext4_symlink+0x30e/0x970 fs/ext4/namei.c:3262
 vfs_symlink fs/namei.c:4119 [inline]
 vfs_symlink+0x218/0x310 fs/namei.c:4105
 do_symlinkat+0x1a5/0x1e0 fs/namei.c:4146
 __do_sys_symlink fs/namei.c:4165 [inline]
 __se_sys_symlink fs/namei.c:4163 [inline]
 __x64_sys_symlink+0x3f/0x50 fs/namei.c:4163
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff88812b4391f0 of 8 bytes by task 21 on cpu 1:
 writeback_sb_inodes+0x38d/0xa50 fs/fs-writeback.c:1702
 __writeback_inodes_wb+0xe8/0x1b0 fs/fs-writeback.c:1782
 wb_writeback+0x557/0x6a0 fs/fs-writeback.c:1891
 wb_check_start_all fs/fs-writeback.c:2015 [inline]
 wb_do_writeback fs/fs-writeback.c:2041 [inline]
 wb_workfn+0x748/0x970 fs/fs-writeback.c:2075
 process_one_work+0x3d4/0x890 kernel/workqueue.c:2269
 worker_thread+0xa0/0x800 kernel/workqueue.c:2415
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 21 Comm: kworker/u4:1 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-8:0)
==================================================================