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

read-write to 0xffff888104e89028 of 4 bytes by task 4301 on cpu 0:
 move_expired_inodes+0x17a/0x410 fs/fs-writeback.c:1457
 queue_io+0xe1/0x2e0 fs/fs-writeback.c:1509
 wb_writeback+0x237/0x640 fs/fs-writeback.c:2152
 wb_do_writeback fs/fs-writeback.c:2303 [inline]
 wb_workfn+0x1a8/0x940 fs/fs-writeback.c:2343
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x4db/0xa20 kernel/workqueue.c:3319
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3400
 kthread+0x4ae/0x520 kernel/kthread.c:464
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read to 0xffff888104e89028 of 4 bytes by task 9738 on cpu 1:
 __mark_inode_dirty+0x198/0x7e0 fs/fs-writeback.c:2537
 mark_buffer_dirty+0x149/0x230 fs/buffer.c:1199
 __block_commit_write fs/buffer.c:2189 [inline]
 block_write_end+0x123/0x210 fs/buffer.c:2265
 generic_write_end+0x5c/0x160 fs/buffer.c:2279
 fat_write_end+0x4e/0x160 fs/fat/inode.c:242
 generic_perform_write+0x33c/0x4a0 mm/filemap.c:4203
 __generic_file_write_iter+0xec/0x120 mm/filemap.c:4286
 generic_file_write_iter+0x8f/0x310 mm/filemap.c:4315
 do_iter_readv_writev+0x403/0x4b0
 vfs_writev+0x2d9/0x880 fs/read_write.c:1050
 do_pwritev fs/read_write.c:1146 [inline]
 __do_sys_pwritev2 fs/read_write.c:1204 [inline]
 __se_sys_pwritev2+0x100/0x1c0 fs/read_write.c:1195
 __x64_sys_pwritev2+0x78/0x90 fs/read_write.c:1195
 x64_sys_call+0x2afe/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:329
 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: 0x00000038 -> 0x0001003a

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 9738 Comm: syz.6.2222 Not tainted 6.14.0-rc6-syzkaller-00145-g695caca9345a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
==================================================================