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BUG: KCSAN: data-race in generic_update_time / generic_update_time

write to 0xffff88821af38178 of 16 bytes by task 4611 on cpu 1:
 generic_update_time+0xc2/0x270 fs/inode.c:1673
 update_time+0x7d/0x90 fs/inode.c:1695
 file_update_time+0x205/0x2d0 fs/inode.c:1910
 fault_dirty_shared_page+0x183/0x1c0 mm/memory.c:2571
 wp_page_shared mm/memory.c:2872 [inline]
 do_wp_page+0xa71/0xca0 mm/memory.c:2973
 handle_pte_fault mm/memory.c:4231 [inline]
 __handle_mm_fault+0x2a65/0x2ec0 mm/memory.c:4345
 handle_mm_fault+0x21c/0x540 mm/memory.c:4382
 do_user_addr_fault arch/x86/mm/fault.c:1464 [inline]
 do_page_fault+0x48a/0xa96 arch/x86/mm/fault.c:1535
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1203

write to 0xffff88821af38178 of 16 bytes by task 4608 on cpu 0:
 generic_update_time+0xc2/0x270 fs/inode.c:1673
 update_time+0x7d/0x90 fs/inode.c:1695
 file_update_time+0x205/0x2d0 fs/inode.c:1910
 fault_dirty_shared_page+0x183/0x1c0 mm/memory.c:2571
 wp_page_shared mm/memory.c:2872 [inline]
 do_wp_page+0xa71/0xca0 mm/memory.c:2973
 handle_pte_fault mm/memory.c:4231 [inline]
 __handle_mm_fault+0x2a65/0x2ec0 mm/memory.c:4345
 handle_mm_fault+0x21c/0x540 mm/memory.c:4382
 do_user_addr_fault arch/x86/mm/fault.c:1464 [inline]
 do_page_fault+0x48a/0xa96 arch/x86/mm/fault.c:1535
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1203

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 4608 Comm: syz-executor.5 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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