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BUG: KCSAN: data-race in inode_update_timestamps / inode_update_timestamps

write to 0xffff888107e418d0 of 8 bytes by task 3463 on cpu 0:
 inode_set_mtime_to_ts include/linux/fs.h:1573 [inline]
 inode_update_timestamps+0x16f/0x280 fs/inode.c:1863
 generic_update_time fs/inode.c:1898 [inline]
 inode_update_time fs/inode.c:1918 [inline]
 __file_update_time fs/inode.c:2106 [inline]
 file_update_time+0x229/0x2b0 fs/inode.c:2136
 pipe_write+0xa81/0xd20 fs/pipe.c:617
 do_iter_readv_writev+0x2b0/0x330
 vfs_writev+0x2e9/0x860 fs/read_write.c:971
 do_writev+0xf8/0x220 fs/read_write.c:1018
 __do_sys_writev fs/read_write.c:1091 [inline]
 __se_sys_writev fs/read_write.c:1088 [inline]
 __x64_sys_writev+0x45/0x50 fs/read_write.c:1088
 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+0x63/0x6b

read to 0xffff888107e418d0 of 8 bytes by task 3450 on cpu 1:
 inode_get_mtime include/linux/fs.h:1567 [inline]
 inode_update_timestamps+0x8a/0x280 fs/inode.c:1857
 generic_update_time fs/inode.c:1898 [inline]
 inode_update_time fs/inode.c:1918 [inline]
 __file_update_time fs/inode.c:2106 [inline]
 file_update_time+0x229/0x2b0 fs/inode.c:2136
 pipe_write+0xa81/0xd20 fs/pipe.c:617
 call_write_iter include/linux/fs.h:2087 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x760/0x8d0 fs/read_write.c:590
 ksys_write+0xeb/0x1a0 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:652
 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+0x63/0x6b

value changed: 0x000000003229f116 -> 0x0000000000188f17

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3450 Comm: syz-executor.1 Not tainted 6.8.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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