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BUG: KCSAN: data-race in inode_update_timestamps / inode_update_timestamps

write to 0xffff8881061653d8 of 8 bytes by task 23311 on cpu 0:
 inode_set_mtime_to_ts include/linux/fs.h:1567 [inline]
 inode_update_timestamps+0x3a6/0x560 fs/inode.c:1901
 generic_update_time fs/inode.c:1936 [inline]
 inode_update_time fs/inode.c:1956 [inline]
 __file_update_time fs/inode.c:2144 [inline]
 file_update_time+0xba/0x140 fs/inode.c:2174
 ext4_page_mkwrite+0x1a4/0xb70 fs/ext4/inode.c:6083
 do_page_mkwrite mm/memory.c:2944 [inline]
 do_shared_fault mm/memory.c:4705 [inline]
 do_fault mm/memory.c:4767 [inline]
 do_pte_missing mm/memory.c:3731 [inline]
 handle_pte_fault mm/memory.c:5039 [inline]
 __handle_mm_fault mm/memory.c:5180 [inline]
 handle_mm_fault+0x193a/0x2dd0 mm/memory.c:5345
 faultin_page mm/gup.c:956 [inline]
 __get_user_pages+0x402/0xe40 mm/gup.c:1239
 __get_user_pages_locked mm/gup.c:1507 [inline]
 __gup_longterm_locked+0x1219/0x14f0 mm/gup.c:2209
 pin_user_pages_remote+0x114/0x170 mm/gup.c:3356
 process_vm_rw_single_vec mm/process_vm_access.c:105 [inline]
 process_vm_rw_core mm/process_vm_access.c:215 [inline]
 process_vm_rw+0x4f4/0x8c0 mm/process_vm_access.c:283
 __do_sys_process_vm_writev mm/process_vm_access.c:303 [inline]
 __se_sys_process_vm_writev mm/process_vm_access.c:298 [inline]
 __x64_sys_process_vm_writev+0x7a/0x90 mm/process_vm_access.c:298
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

write to 0xffff8881061653d8 of 8 bytes by task 23287 on cpu 1:
 inode_set_mtime_to_ts include/linux/fs.h:1567 [inline]
 inode_update_timestamps+0x3a6/0x560 fs/inode.c:1901
 generic_update_time fs/inode.c:1936 [inline]
 inode_update_time fs/inode.c:1956 [inline]
 __file_update_time fs/inode.c:2144 [inline]
 file_modified_flags+0x144/0x1d0 fs/inode.c:2215
 file_modified+0x17/0x20 fs/inode.c:2231
 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
 do_iter_write+0x4ad/0x770 fs/read_write.c:860
 vfs_iter_write+0x56/0x70 fs/read_write.c:901
 iter_file_splice_write+0x462/0x7e0 fs/splice.c:736
 do_splice_from fs/splice.c:933 [inline]
 direct_splice_actor+0x8a/0xb0 fs/splice.c:1142
 splice_direct_to_actor+0x31d/0x690 fs/splice.c:1088
 do_splice_direct+0x10d/0x190 fs/splice.c:1194
 do_sendfile+0x3c4/0x980 fs/read_write.c:1254
 __do_sys_sendfile64 fs/read_write.c:1322 [inline]
 __se_sys_sendfile64 fs/read_write.c:1308 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1308
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x000000001c03a776 -> 0x000000001c9c3df6

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 23287 Comm: syz-executor.2 Not tainted 6.7.0-rc6-syzkaller-00078-ga4aebe936554 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
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