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BUG: KCSAN: data-race in file_update_time / inode_update_timestamps

read to 0xffff888128fd86e0 of 8 bytes by task 13861 on cpu 1:
 inode_get_ctime include/linux/fs.h:1611 [inline]
 inode_needs_update_time fs/inode.c:2092 [inline]
 file_update_time+0x107/0x2c0 fs/inode.c:2135
 fault_dirty_shared_page+0xde/0x340 mm/memory.c:3135
 do_shared_fault mm/memory.c:5009 [inline]
 do_fault mm/memory.c:5055 [inline]
 do_pte_missing mm/memory.c:3897 [inline]
 handle_pte_fault mm/memory.c:5381 [inline]
 __handle_mm_fault mm/memory.c:5524 [inline]
 handle_mm_fault+0x1378/0x2a80 mm/memory.c:5689
 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
 rep_movs_alternative+0x4a/0x70 arch/x86/lib/copy_user_64.S:65
 copy_user_generic arch/x86/include/asm/uaccess_64.h:110 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:131 [inline]
 copy_to_user_iter lib/iov_iter.c:25 [inline]
 iterate_iovec include/linux/iov_iter.h:51 [inline]
 iterate_and_advance2 include/linux/iov_iter.h:247 [inline]
 iterate_and_advance include/linux/iov_iter.h:271 [inline]
 _copy_to_iter+0x2c5/0xaf0 lib/iov_iter.c:185
 copy_page_to_iter+0x171/0x2b0 lib/iov_iter.c:362
 process_vm_rw_pages mm/process_vm_access.c:45 [inline]
 process_vm_rw_single_vec mm/process_vm_access.c:118 [inline]
 process_vm_rw_core mm/process_vm_access.c:216 [inline]
 process_vm_rw+0x5f0/0x8c0 mm/process_vm_access.c:284
 __do_sys_process_vm_readv mm/process_vm_access.c:296 [inline]
 __se_sys_process_vm_readv mm/process_vm_access.c:292 [inline]
 __x64_sys_process_vm_readv+0x7a/0x90 mm/process_vm_access.c:292
 x64_sys_call+0x2597/0x2d70 arch/x86/include/generated/asm/syscalls_64.h:311
 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

write to 0xffff888128fd86e0 of 8 bytes by task 13864 on cpu 0:
 inode_set_ctime_to_ts include/linux/fs.h:1617 [inline]
 inode_set_ctime_current fs/inode.c:2515 [inline]
 inode_update_timestamps+0xb5/0x280 fs/inode.c:1861
 generic_update_time fs/inode.c:1900 [inline]
 inode_update_time fs/inode.c:1920 [inline]
 __file_update_time fs/inode.c:2109 [inline]
 file_update_time+0x22f/0x2c0 fs/inode.c:2139
 fault_dirty_shared_page+0xde/0x340 mm/memory.c:3135
 do_shared_fault mm/memory.c:5009 [inline]
 do_fault mm/memory.c:5055 [inline]
 do_pte_missing mm/memory.c:3897 [inline]
 handle_pte_fault mm/memory.c:5381 [inline]
 __handle_mm_fault mm/memory.c:5524 [inline]
 handle_mm_fault+0x1378/0x2a80 mm/memory.c:5689
 faultin_page mm/gup.c:1290 [inline]
 __get_user_pages+0x49d/0xf10 mm/gup.c:1589
 __get_user_pages_locked mm/gup.c:1857 [inline]
 faultin_page_range+0x352/0x5d0 mm/gup.c:2081
 madvise_populate mm/madvise.c:943 [inline]
 do_madvise+0x40d/0x2610 mm/madvise.c:1461
 __do_sys_madvise mm/madvise.c:1481 [inline]
 __se_sys_madvise mm/madvise.c:1479 [inline]
 __x64_sys_madvise+0x61/0x70 mm/madvise.c:1479
 x64_sys_call+0x285d/0x2d70 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: 0x00000000018bdcb0 -> 0x0000000002247330

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 13864 Comm: syz.4.3355 Not tainted 6.10.0-rc7-syzkaller-00003-g4376e966ecb7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
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