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BUG: KCSAN: data-race in file_update_time / inode_update_timestamps

write to 0xffff888103c0bb18 of 4 bytes by task 7891 on cpu 0:
 inode_set_ctime_to_ts include/linux/fs.h:1637 [inline]
 inode_set_ctime_current fs/inode.c:2591 [inline]
 inode_update_timestamps+0xaf/0x280 fs/inode.c:1923
 generic_update_time fs/inode.c:1962 [inline]
 inode_update_time fs/inode.c:1982 [inline]
 __file_update_time fs/inode.c:2171 [inline]
 file_update_time+0x229/0x2c0 fs/inode.c:2201
 fault_dirty_shared_page+0xde/0x340 mm/memory.c:3184
 do_shared_fault mm/memory.c:5149 [inline]
 do_fault mm/memory.c:5195 [inline]
 do_pte_missing mm/memory.c:3947 [inline]
 handle_pte_fault mm/memory.c:5522 [inline]
 __handle_mm_fault mm/memory.c:5665 [inline]
 handle_mm_fault+0x1399/0x2940 mm/memory.c:5833
 faultin_page mm/gup.c:1194 [inline]
 __get_user_pages+0x499/0x10d0 mm/gup.c:1493
 __get_user_pages_locked mm/gup.c:1760 [inline]
 faultin_page_range+0x101/0x5d0 mm/gup.c:1984
 madvise_populate mm/madvise.c:943 [inline]
 do_madvise+0x404/0x2620 mm/madvise.c:1464
 __do_sys_madvise mm/madvise.c:1484 [inline]
 __se_sys_madvise mm/madvise.c:1482 [inline]
 __x64_sys_madvise+0x61/0x70 mm/madvise.c:1482
 x64_sys_call+0x2320/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:29
 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

read to 0xffff888103c0bb18 of 4 bytes by task 7890 on cpu 1:
 inode_get_ctime_nsec include/linux/fs.h:1622 [inline]
 inode_get_ctime include/linux/fs.h:1628 [inline]
 inode_needs_update_time fs/inode.c:2154 [inline]
 file_update_time+0x104/0x2c0 fs/inode.c:2197
 fault_dirty_shared_page+0xde/0x340 mm/memory.c:3184
 do_shared_fault mm/memory.c:5149 [inline]
 do_fault mm/memory.c:5195 [inline]
 do_pte_missing mm/memory.c:3947 [inline]
 handle_pte_fault mm/memory.c:5522 [inline]
 __handle_mm_fault mm/memory.c:5665 [inline]
 handle_mm_fault+0x1399/0x2940 mm/memory.c:5833
 faultin_page mm/gup.c:1194 [inline]
 __get_user_pages+0x499/0x10d0 mm/gup.c:1493
 __get_user_pages_locked mm/gup.c:1760 [inline]
 faultin_page_range+0x101/0x5d0 mm/gup.c:1984
 madvise_populate mm/madvise.c:943 [inline]
 do_madvise+0x404/0x2620 mm/madvise.c:1464
 __do_sys_madvise mm/madvise.c:1484 [inline]
 __se_sys_madvise mm/madvise.c:1482 [inline]
 __x64_sys_madvise+0x61/0x70 mm/madvise.c:1482
 x64_sys_call+0x2320/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:29
 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: 0x07571c78 -> 0x07efb2f9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 7890 Comm: syz.4.681 Not tainted 6.11.0-rc1-syzkaller-00256-g1c4246294c98 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
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