syzbot

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BUG: KCSAN: data-race in __mark_inode_dirty / redirty_tail_locked

read-write to 0xffff88810a956650 of 8 bytes by task 25 on cpu 0:
 redirty_tail_locked+0x56/0x270 fs/fs-writeback.c:1300
 requeue_inode fs/fs-writeback.c:1556 [inline]
 writeback_sb_inodes+0x890/0xa30 fs/fs-writeback.c:1918
 wb_writeback+0x26b/0x650 fs/fs-writeback.c:2063
 wb_do_writeback+0x101/0x600 fs/fs-writeback.c:2206
 wb_workfn+0x88/0x260 fs/fs-writeback.c:2246
 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:308

read to 0xffff88810a956650 of 8 bytes by task 5237 on cpu 1:
 __mark_inode_dirty+0x4f/0x730 fs/fs-writeback.c:2401
 mark_inode_dirty include/linux/fs.h:2465 [inline]
 generic_write_end+0x175/0x350 fs/buffer.c:2184
 ext4_da_write_end+0x26c/0x620 fs/ext4/inode.c:3175
 generic_perform_write+0x264/0x3f0 mm/filemap.c:3783
 ext4_buffered_write_iter+0x235/0x3e0 fs/ext4/file.c:285
 ext4_file_write_iter+0x2bb/0x11b0
 call_write_iter include/linux/fs.h:2189 [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 -> 0x0000000000000007

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 5237 Comm: syz-executor.2 Not tainted 6.2.0-rc6-syzkaller-00083-ge7368fd30165-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
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