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BUG: KCSAN: data-race in inode_update_timestamps / inode_update_timestamps

write to 0xffff888106967cf8 of 8 bytes by task 4103 on cpu 1:
 inode_set_ctime_to_ts include/linux/fs.h:1601 [inline]
 inode_set_ctime include/linux/fs.h:1619 [inline]
 inode_set_ctime_current fs/inode.c:2512 [inline]
 inode_update_timestamps+0xb5/0x280 fs/inode.c:1859
 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
 ext4_page_mkwrite+0x1a4/0xb70 fs/ext4/inode.c:6060
 do_page_mkwrite mm/memory.c:2966 [inline]
 wp_page_shared mm/memory.c:3353 [inline]
 do_wp_page+0xae9/0x1f20 mm/memory.c:3493
 handle_pte_fault mm/memory.c:5160 [inline]
 __handle_mm_fault mm/memory.c:5285 [inline]
 handle_mm_fault+0xb80/0x27c0 mm/memory.c:5450
 do_user_addr_fault arch/x86/mm/fault.c:1364 [inline]
 handle_page_fault arch/x86/mm/fault.c:1507 [inline]
 exc_page_fault+0x401/0x6d0 arch/x86/mm/fault.c:1563
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

read to 0xffff888106967cf8 of 8 bytes by task 4105 on cpu 0:
 inode_get_ctime include/linux/fs.h:1595 [inline]
 inode_update_timestamps+0x59/0x280 fs/inode.c:1856
 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_modified_flags+0x29c/0x330 fs/inode.c:2177
 file_modified+0x17/0x20 fs/inode.c:2193
 ext4_write_checks fs/ext4/file.c:279 [inline]
 ext4_buffered_write_iter+0x1d8/0x370 fs/ext4/file.c:295
 ext4_file_write_iter+0x297/0xe10
 call_write_iter include/linux/fs.h:2085 [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: 0x00000000186fb6f5 -> 0x000000001b6aa775

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 4105 Comm: syz-executor.3 Not tainted 6.8.0-rc4-syzkaller-00267-g0f1dd5e91e2b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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