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BUG: KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode

read-write to 0xffff8881004c1d40 of 8 bytes by task 40 on cpu 1:
 __writeback_single_inode+0x201/0x870 fs/fs-writeback.c:1687
 writeback_sb_inodes+0x559/0xb20 fs/fs-writeback.c:1947
 __writeback_inodes_wb+0x9a/0x1a0 fs/fs-writeback.c:2018
 wb_writeback+0x270/0x720 fs/fs-writeback.c:2129
 wb_check_background_flush fs/fs-writeback.c:2199 [inline]
 wb_do_writeback fs/fs-writeback.c:2287 [inline]
 wb_workfn+0x67f/0x940 fs/fs-writeback.c:2314
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3312
 worker_thread+0x526/0x730 kernel/workqueue.c:3393
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read to 0xffff8881004c1d40 of 8 bytes by task 10444 on cpu 0:
 __mark_inode_dirty+0x19f/0x7e0 fs/fs-writeback.c:2508
 mark_buffer_dirty+0x165/0x250 fs/buffer.c:1211
 __ext4_handle_dirty_metadata+0x1fa/0x470 fs/ext4/ext4_jbd2.c:384
 ext4_do_update_inode fs/ext4/inode.c:5084 [inline]
 ext4_mark_iloc_dirty+0xaa4/0xe10 fs/ext4/inode.c:5702
 __ext4_mark_inode_dirty+0x314/0x440 fs/ext4/inode.c:5906
 ext4_dirty_inode+0x91/0xb0 fs/ext4/inode.c:5935
 __mark_inode_dirty+0x16d/0x7e0 fs/fs-writeback.c:2486
 mark_inode_dirty include/linux/fs.h:2404 [inline]
 dquot_alloc_space include/linux/quotaops.h:319 [inline]
 dquot_alloc_block include/linux/quotaops.h:336 [inline]
 ext4_xattr_block_set+0xbe3/0x1ca0 fs/ext4/xattr.c:2050
 ext4_xattr_set_handle+0x8ac/0xbf0 fs/ext4/xattr.c:2452
 ext4_initxattrs+0x60/0xb0 fs/ext4/xattr_security.c:44
 security_inode_init_security+0x19d/0x290 security/security.c:1744
 ext4_init_security+0x34/0x40 fs/ext4/xattr_security.c:58
 __ext4_new_inode+0x2009/0x2270 fs/ext4/ialloc.c:1326
 ext4_create+0x172/0x2f0 fs/ext4/namei.c:2830
 lookup_open fs/namei.c:3505 [inline]
 open_last_lookups fs/namei.c:3574 [inline]
 path_openat+0xdde/0x1da0 fs/namei.c:3804
 do_filp_open+0xf7/0x200 fs/namei.c:3834
 do_sys_openat2+0xab/0x120 fs/open.c:1405
 do_sys_open fs/open.c:1420 [inline]
 __do_sys_openat fs/open.c:1436 [inline]
 __se_sys_openat fs/open.c:1431 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1431
 x64_sys_call+0x1057/0x2d70 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000020084 -> 0x0000000000000004

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 10444 Comm: syz-executor.3 Not tainted 6.10.0-rc3-syzkaller-00164-g44ef20baed8e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
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