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BUG: KCSAN: data-race in inode_needs_update_time / inode_update_timestamps

write to 0xffff88813d6e5cf8 of 8 bytes by task 16306 on cpu 1:
 inode_update_timestamps+0x24d/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]
 wp_page_shared mm/memory.c:3291 [inline]
 do_wp_page+0xcab/0x1ee0 mm/memory.c:3376
 handle_pte_fault mm/memory.c:4994 [inline]
 __handle_mm_fault mm/memory.c:5119 [inline]
 handle_mm_fault+0xe2a/0x2cc0 mm/memory.c:5284
 faultin_page mm/gup.c:956 [inline]
 __get_user_pages+0x402/0xe40 mm/gup.c:1239
 faultin_vma_page_range+0x7e/0xa0 mm/gup.c:1724
 madvise_populate mm/madvise.c:939 [inline]
 madvise_vma_behavior mm/madvise.c:1048 [inline]
 madvise_walk_vmas mm/madvise.c:1270 [inline]
 do_madvise+0x979/0x2970 mm/madvise.c:1450
 __do_sys_madvise mm/madvise.c:1463 [inline]
 __se_sys_madvise mm/madvise.c:1461 [inline]
 __x64_sys_madvise+0x60/0x70 mm/madvise.c:1461
 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 0xffff88813d6e5cf8 of 8 bytes by task 16305 on cpu 0:
 timespec64_equal include/linux/time64.h:49 [inline]
 inode_needs_update_time+0x1b4/0x370 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]
 wp_page_shared mm/memory.c:3291 [inline]
 do_wp_page+0xcab/0x1ee0 mm/memory.c:3376
 handle_pte_fault mm/memory.c:4994 [inline]
 __handle_mm_fault mm/memory.c:5119 [inline]
 handle_mm_fault+0xe2a/0x2cc0 mm/memory.c:5284
 faultin_page mm/gup.c:956 [inline]
 __get_user_pages+0x402/0xe40 mm/gup.c:1239
 faultin_vma_page_range+0x7e/0xa0 mm/gup.c:1724
 madvise_populate mm/madvise.c:939 [inline]
 madvise_vma_behavior mm/madvise.c:1048 [inline]
 madvise_walk_vmas mm/madvise.c:1270 [inline]
 do_madvise+0x979/0x2970 mm/madvise.c:1450
 __do_sys_madvise mm/madvise.c:1463 [inline]
 __se_sys_madvise mm/madvise.c:1461 [inline]
 __x64_sys_madvise+0x60/0x70 mm/madvise.c:1461
 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

value changed: 0x00000000233f936a -> 0x00000000250956e9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 16305 Comm: syz-executor.5 Not tainted 6.5.0-syzkaller-12145-g4a0fc73da97e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
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