syzbot

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BUG: KCSAN: data-race in __anon_vma_prepare / handle_mm_fault

write to 0xffff888109c7ece8 of 8 bytes by task 22538 on cpu 0:
 __anon_vma_prepare+0x180/0x310 mm/rmap.c:213
 __vmf_anon_prepare mm/memory.c:3321 [inline]
 vmf_anon_prepare mm/internal.h:372 [inline]
 do_anonymous_page mm/memory.c:4805 [inline]
 do_pte_missing mm/memory.c:3977 [inline]
 handle_pte_fault mm/memory.c:5801 [inline]
 __handle_mm_fault mm/memory.c:5944 [inline]
 handle_mm_fault+0x1c76/0x2ac0 mm/memory.c:6112
 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
 __put_user_4+0x11/0x20 arch/x86/lib/putuser.S:86
 __sys_socketpair+0xba/0x430 net/socket.c:1750
 __do_sys_socketpair net/socket.c:1816 [inline]
 __se_sys_socketpair net/socket.c:1813 [inline]
 __x64_sys_socketpair+0x52/0x60 net/socket.c:1813
 x64_sys_call+0x1cad/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:54
 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 0xffff888109c7ece8 of 8 bytes by task 22537 on cpu 1:
 __vmf_anon_prepare mm/memory.c:3315 [inline]
 vmf_anon_prepare mm/internal.h:372 [inline]
 do_anonymous_page mm/memory.c:4805 [inline]
 do_pte_missing mm/memory.c:3977 [inline]
 handle_pte_fault mm/memory.c:5801 [inline]
 __handle_mm_fault mm/memory.c:5944 [inline]
 handle_mm_fault+0xda3/0x2ac0 mm/memory.c:6112
 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
 __put_user_4+0x11/0x20 arch/x86/lib/putuser.S:86
 __sys_socketpair+0xba/0x430 net/socket.c:1750
 __do_sys_socketpair net/socket.c:1816 [inline]
 __se_sys_socketpair net/socket.c:1813 [inline]
 __x64_sys_socketpair+0x52/0x60 net/socket.c:1813
 x64_sys_call+0x1cad/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:54
 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: 0x0000000000000000 -> 0xffff88810358e4e0

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 22537 Comm: syz.8.6789 Not tainted 6.13.0-rc2-syzkaller-00130-g150b567e0d57 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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