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BUG: KCSAN: data-race in do_sync_mmap_readahead / do_sync_mmap_readahead

write to 0xffff8881018aaa84 of 4 bytes by task 21498 on cpu 0:
 do_sync_mmap_readahead+0x3f5/0x450 mm/filemap.c:3197
 filemap_fault+0x3e6/0xbf0 mm/filemap.c:3291
 __do_fault mm/memory.c:4204 [inline]
 do_read_fault mm/memory.c:4568 [inline]
 do_fault mm/memory.c:4705 [inline]
 do_pte_missing mm/memory.c:3669 [inline]
 handle_pte_fault mm/memory.c:4978 [inline]
 __handle_mm_fault mm/memory.c:5119 [inline]
 handle_mm_fault+0x15e2/0x2cc0 mm/memory.c:5284
 do_user_addr_fault arch/x86/mm/fault.c:1413 [inline]
 handle_page_fault arch/x86/mm/fault.c:1505 [inline]
 exc_page_fault+0x2f7/0x6c0 arch/x86/mm/fault.c:1561
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
 __get_user_4+0x11/0x20 arch/x86/lib/getuser.S:75
 sg_ioctl_common drivers/scsi/sg.c:995 [inline]
 sg_ioctl+0x1fd/0x1870 drivers/scsi/sg.c:1160
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl+0xcf/0x140 fs/ioctl.c:857
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

write to 0xffff8881018aaa84 of 4 bytes by task 21503 on cpu 1:
 do_sync_mmap_readahead+0x3f5/0x450 mm/filemap.c:3197
 filemap_fault+0x3e6/0xbf0 mm/filemap.c:3291
 __do_fault mm/memory.c:4204 [inline]
 do_read_fault mm/memory.c:4568 [inline]
 do_fault mm/memory.c:4705 [inline]
 do_pte_missing mm/memory.c:3669 [inline]
 handle_pte_fault mm/memory.c:4978 [inline]
 __handle_mm_fault mm/memory.c:5119 [inline]
 handle_mm_fault+0x15e2/0x2cc0 mm/memory.c:5284
 do_user_addr_fault arch/x86/mm/fault.c:1413 [inline]
 handle_page_fault arch/x86/mm/fault.c:1505 [inline]
 exc_page_fault+0x2f7/0x6c0 arch/x86/mm/fault.c:1561
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
 strncpy_from_user+0xe5/0x270 lib/strncpy_from_user.c:139
 getname_flags+0xb3/0x360 fs/namei.c:151
 getname+0x19/0x20 fs/namei.c:219
 do_sys_openat2+0x67/0x110 fs/open.c:1416
 do_sys_open fs/open.c:1437 [inline]
 __do_sys_open fs/open.c:1445 [inline]
 __se_sys_open fs/open.c:1441 [inline]
 __x64_sys_open+0xe6/0x110 fs/open.c:1441
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000000 -> 0x00000008

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 21503 Comm: syz-executor.1 Tainted: G        W          6.5.0-syzkaller-13150-g535a265d7f0d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
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