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BUG: KCSAN: data-race in file_update_time / inode_update_timestamps

write to 0xffff888106ac2f48 of 8 bytes by task 21555 on cpu 1:
 inode_set_ctime_to_ts include/linux/fs.h:1617 [inline]
 inode_set_ctime_current fs/inode.c:2515 [inline]
 inode_update_timestamps+0xb5/0x280 fs/inode.c:1861
 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:6053
 do_page_mkwrite mm/memory.c:3093 [inline]
 do_shared_fault mm/memory.c:4992 [inline]
 do_fault mm/memory.c:5054 [inline]
 do_pte_missing mm/memory.c:3897 [inline]
 handle_pte_fault mm/memory.c:5380 [inline]
 __handle_mm_fault mm/memory.c:5523 [inline]
 handle_mm_fault+0x12e4/0x2a80 mm/memory.c:5688
 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x296/0x650 arch/x86/mm/fault.c:1539
 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_iter lib/iov_iter.c:25 [inline]
 iterate_ubuf include/linux/iov_iter.h:29 [inline]
 iterate_and_advance2 include/linux/iov_iter.h:245 [inline]
 iterate_and_advance include/linux/iov_iter.h:271 [inline]
 _copy_to_iter+0x137/0xaf0 lib/iov_iter.c:185
 copy_to_iter include/linux/uio.h:196 [inline]
 eventfd_read+0x2a9/0x3f0 fs/eventfd.c:241
 aio_read+0x1e4/0x2f0 fs/aio.c:1611
 io_submit_one+0xaea/0x1240 fs/aio.c:2061
 __do_sys_io_submit fs/aio.c:2120 [inline]
 __se_sys_io_submit+0xf5/0x280 fs/aio.c:2090
 __x64_sys_io_submit+0x43/0x50 fs/aio.c:2090
 x64_sys_call+0x2ab5/0x2d70 arch/x86/include/generated/asm/syscalls_64.h:210
 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

read to 0xffff888106ac2f48 of 8 bytes by task 21554 on cpu 0:
 inode_get_ctime include/linux/fs.h:1611 [inline]
 inode_needs_update_time fs/inode.c:2092 [inline]
 file_update_time+0x107/0x2c0 fs/inode.c:2135
 ext4_page_mkwrite+0x1a4/0xb70 fs/ext4/inode.c:6053
 do_page_mkwrite mm/memory.c:3093 [inline]
 do_shared_fault mm/memory.c:4992 [inline]
 do_fault mm/memory.c:5054 [inline]
 do_pte_missing mm/memory.c:3897 [inline]
 handle_pte_fault mm/memory.c:5380 [inline]
 __handle_mm_fault mm/memory.c:5523 [inline]
 handle_mm_fault+0x12e4/0x2a80 mm/memory.c:5688
 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x296/0x650 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

value changed: 0x00000000364b7eb9 -> 0x0000000036e41539

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 21554 Comm: syz-executor.2 Tainted: G        W          6.10.0-rc4-syzkaller-00052-ge5b3efbe1ab1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
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