syzbot

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BUG: KCSAN: data-race in do_sync_mmap_readahead / do_sync_mmap_readahead

write to 0xffff88813a2f17a4 of 4 bytes by task 28594 on cpu 0:
 do_sync_mmap_readahead+0x342/0x3a0 mm/filemap.c:3188
 filemap_fault+0x3c1/0xb20 mm/filemap.c:3282
 __do_fault mm/memory.c:4141 [inline]
 do_read_fault mm/memory.c:4492 [inline]
 do_fault mm/memory.c:4621 [inline]
 handle_pte_fault mm/memory.c:4909 [inline]
 __handle_mm_fault mm/memory.c:5051 [inline]
 handle_mm_fault+0x115d/0x21d0 mm/memory.c:5197
 do_user_addr_fault arch/x86/mm/fault.c:1407 [inline]
 handle_page_fault arch/x86/mm/fault.c:1498 [inline]
 exc_page_fault+0x45f/0x640 arch/x86/mm/fault.c:1554
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
 copy_user_short_string+0xa/0x40 arch/x86/lib/copy_user_64.S:231
 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
 raw_copy_from_user arch/x86/include/asm/uaccess_64.h:52 [inline]
 _copy_from_user+0x7f/0xd0 lib/usercopy.c:23
 copy_from_user include/linux/uaccess.h:161 [inline]
 move_addr_to_kernel+0x82/0x110 net/socket.c:250
 __sys_connect+0x74/0x1b0 net/socket.c:2016
 __do_sys_connect net/socket.c:2028 [inline]
 __se_sys_connect net/socket.c:2025 [inline]
 __x64_sys_connect+0x41/0x50 net/socket.c:2025
 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 0xffff88813a2f17a4 of 4 bytes by task 28600 on cpu 1:
 do_sync_mmap_readahead+0x342/0x3a0 mm/filemap.c:3188
 filemap_fault+0x3c1/0xb20 mm/filemap.c:3282
 __do_fault mm/memory.c:4141 [inline]
 do_read_fault mm/memory.c:4492 [inline]
 do_fault mm/memory.c:4621 [inline]
 handle_pte_fault mm/memory.c:4909 [inline]
 __handle_mm_fault mm/memory.c:5051 [inline]
 handle_mm_fault+0x115d/0x21d0 mm/memory.c:5197
 do_user_addr_fault arch/x86/mm/fault.c:1407 [inline]
 handle_page_fault arch/x86/mm/fault.c:1498 [inline]
 exc_page_fault+0x45f/0x640 arch/x86/mm/fault.c:1554
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
 copy_user_short_string+0xa/0x40 arch/x86/lib/copy_user_64.S:231
 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
 raw_copy_from_user arch/x86/include/asm/uaccess_64.h:52 [inline]
 _copy_from_user+0x7f/0xd0 lib/usercopy.c:23
 copy_from_user include/linux/uaccess.h:161 [inline]
 move_addr_to_kernel+0x82/0x110 net/socket.c:250
 __sys_connect+0x74/0x1b0 net/socket.c:2016
 __do_sys_connect net/socket.c:2028 [inline]
 __se_sys_connect net/socket.c:2025 [inline]
 __x64_sys_connect+0x41/0x50 net/socket.c:2025
 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: 28600 Comm: syz-executor.1 Not tainted 6.3.0-rc3-syzkaller-00016-g2faac9a98f01 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
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