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BUG: KCSAN: data-race in file_update_time / inode_update_timestamps

read to 0xffff888107eba188 of 8 bytes by task 5613 on cpu 0:
 inode_get_mtime include/linux/fs.h:1590 [inline]
 inode_needs_update_time fs/inode.c:2088 [inline]
 file_update_time+0x98/0x2c0 fs/inode.c:2135
 ext4_page_mkwrite+0x1a4/0xb70 fs/ext4/inode.c:6060
 do_page_mkwrite mm/memory.c:3091 [inline]
 do_shared_fault mm/memory.c:4966 [inline]
 do_fault mm/memory.c:5028 [inline]
 do_pte_missing mm/memory.c:3880 [inline]
 handle_pte_fault mm/memory.c:5300 [inline]
 __handle_mm_fault mm/memory.c:5441 [inline]
 handle_mm_fault+0x12a8/0x27e0 mm/memory.c:5606
 do_user_addr_fault arch/x86/mm/fault.c:1382 [inline]
 handle_page_fault arch/x86/mm/fault.c:1474 [inline]
 exc_page_fault+0x2f5/0x690 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
 rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:57
 copy_user_generic arch/x86/include/asm/uaccess_64.h:110 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:131 [inline]
 __copy_to_user include/linux/uaccess.h:138 [inline]
 set_fd_set+0x70/0x90 fs/select.c:404
 core_sys_select+0x3ff/0x530 fs/select.c:692
 kern_select fs/select.c:722 [inline]
 __do_sys_select fs/select.c:729 [inline]
 __se_sys_select+0x1c7/0x210 fs/select.c:726
 __x64_sys_select+0x67/0x80 fs/select.c:726
 x64_sys_call+0x1ac0/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:24
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

write to 0xffff888107eba188 of 8 bytes by task 5612 on cpu 1:
 inode_set_mtime_to_ts include/linux/fs.h:1596 [inline]
 inode_update_timestamps+0x16f/0x280 fs/inode.c:1865
 generic_update_time fs/inode.c:1900 [inline]
 inode_update_time fs/inode.c:1920 [inline]
 __file_update_time fs/inode.c:2109 [inline]
 file_update_time+0x22f/0x2c0 fs/inode.c:2139
 ext4_page_mkwrite+0x1a4/0xb70 fs/ext4/inode.c:6060
 do_page_mkwrite mm/memory.c:3091 [inline]
 do_shared_fault mm/memory.c:4966 [inline]
 do_fault mm/memory.c:5028 [inline]
 do_pte_missing mm/memory.c:3880 [inline]
 handle_pte_fault mm/memory.c:5300 [inline]
 __handle_mm_fault mm/memory.c:5441 [inline]
 handle_mm_fault+0x12a8/0x27e0 mm/memory.c:5606
 do_user_addr_fault arch/x86/mm/fault.c:1331 [inline]
 handle_page_fault arch/x86/mm/fault.c:1474 [inline]
 exc_page_fault+0x3eb/0x690 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

value changed: 0x000000002af17039 -> 0x000000002e84f73a

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 5612 Comm: syz-executor.4 Tainted: G        W          6.9.0-rc7-syzkaller-00188-gba16c1cf11c9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
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