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BUG: KCSAN: data-race in inode_needs_update_time / inode_update_timestamps

write to 0xffff8881062cc190 of 8 bytes by task 21183 on cpu 1:
 inode_update_timestamps+0x240/0x3e0 fs/inode.c:1896
 generic_update_time fs/inode.c:1929 [inline]
 inode_update_time fs/inode.c:1949 [inline]
 __file_update_time fs/inode.c:2177 [inline]
 file_update_time+0xba/0x140 fs/inode.c:2207
 ext4_page_mkwrite+0x1a4/0xb70 fs/ext4/inode.c:6074
 do_page_mkwrite mm/memory.c:2931 [inline]
 do_shared_fault mm/memory.c:4647 [inline]
 do_fault mm/memory.c:4709 [inline]
 do_pte_missing mm/memory.c:3669 [inline]
 handle_pte_fault mm/memory.c:4978 [inline]
 __handle_mm_fault mm/memory.c:5119 [inline]
 handle_mm_fault+0x1874/0x2cc0 mm/memory.c:5284
 do_user_addr_fault arch/x86/mm/fault.c:1413 [inline]
 handle_page_fault arch/x86/mm/fault.c:1505 [inline]
 exc_page_fault+0x2f7/0x6c0 arch/x86/mm/fault.c:1561
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
 __put_user_4+0x11/0x20 arch/x86/lib/putuser.S:89
 __sys_sendmmsg+0x38b/0x500 net/socket.c:2685
 __do_sys_sendmmsg net/socket.c:2709 [inline]
 __se_sys_sendmmsg net/socket.c:2706 [inline]
 __x64_sys_sendmmsg+0x57/0x60 net/socket.c:2706
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff8881062cc190 of 8 bytes by task 21179 on cpu 0:
 timespec64_equal include/linux/time64.h:49 [inline]
 inode_needs_update_time+0x197/0x370 fs/inode.c:2157
 file_update_time+0x2d/0x140 fs/inode.c:2203
 ext4_page_mkwrite+0x1a4/0xb70 fs/ext4/inode.c:6074
 do_page_mkwrite mm/memory.c:2931 [inline]
 do_shared_fault mm/memory.c:4647 [inline]
 do_fault mm/memory.c:4709 [inline]
 do_pte_missing mm/memory.c:3669 [inline]
 handle_pte_fault mm/memory.c:4978 [inline]
 __handle_mm_fault mm/memory.c:5119 [inline]
 handle_mm_fault+0x1874/0x2cc0 mm/memory.c:5284
 do_user_addr_fault arch/x86/mm/fault.c:1413 [inline]
 handle_page_fault arch/x86/mm/fault.c:1505 [inline]
 exc_page_fault+0x2f7/0x6c0 arch/x86/mm/fault.c:1561
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

value changed: 0x0000000000000537 -> 0x0000000000000538

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 21179 Comm: syz-executor.3 Tainted: G        W          6.5.0-syzkaller-11191-g6e32dfcccfcc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
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