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BUG: KCSAN: data-race in file_update_time / inode_update_timestamps

read to 0xffff88812269ae9c of 4 bytes by task 23514 on cpu 0:
 inode_get_mtime_nsec include/linux/fs.h:1634 [inline]
 inode_get_mtime include/linux/fs.h:1640 [inline]
 inode_needs_update_time fs/inode.c:2332 [inline]
 file_update_time+0x8b/0x2b0 fs/inode.c:2379
 ext4_page_mkwrite+0x19e/0xb70 fs/ext4/inode.c:6159
 do_page_mkwrite mm/memory.c:3176 [inline]
 wp_page_shared mm/memory.c:3577 [inline]
 do_wp_page+0xca1/0x2340 mm/memory.c:3727
 handle_pte_fault mm/memory.c:5817 [inline]
 __handle_mm_fault mm/memory.c:5944 [inline]
 handle_mm_fault+0xc63/0x2ac0 mm/memory.c:6112
 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x3b9/0x650 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

write to 0xffff88812269ae9c of 4 bytes by task 23516 on cpu 1:
 inode_set_mtime_to_ts include/linux/fs.h:1648 [inline]
 inode_update_timestamps+0x139/0x250 fs/inode.c:2070
 generic_update_time fs/inode.c:2105 [inline]
 inode_update_time fs/inode.c:2125 [inline]
 __file_update_time fs/inode.c:2353 [inline]
 file_update_time+0x219/0x2b0 fs/inode.c:2383
 ext4_page_mkwrite+0x19e/0xb70 fs/ext4/inode.c:6159
 do_page_mkwrite mm/memory.c:3176 [inline]
 wp_page_shared mm/memory.c:3577 [inline]
 do_wp_page+0xca1/0x2340 mm/memory.c:3727
 handle_pte_fault mm/memory.c:5817 [inline]
 __handle_mm_fault mm/memory.c:5944 [inline]
 handle_mm_fault+0xc63/0x2ac0 mm/memory.c:6112
 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x296/0x650 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
 __put_user_8+0x11/0x20 arch/x86/lib/putuser.S:105
 __do_sys_io_setup fs/aio.c:1402 [inline]
 __se_sys_io_setup+0x95/0x1b0 fs/aio.c:1382
 __x64_sys_io_setup+0x31/0x40 fs/aio.c:1382
 x64_sys_call+0x160f/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:207
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x2e7ddef6 -> 0x07bfa87c

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 23516 Comm: syz.6.7168 Not tainted 6.13.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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