syzbot

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BUG: KCSAN: data-race in __anon_vma_prepare / handle_mm_fault

write to 0xffff888115ef7748 of 8 bytes by task 15774 on cpu 1:
 __anon_vma_prepare+0x180/0x310 mm/rmap.c:214
 __vmf_anon_prepare mm/memory.c:3307 [inline]
 vmf_anon_prepare mm/internal.h:371 [inline]
 do_anonymous_page mm/memory.c:4780 [inline]
 do_pte_missing mm/memory.c:3963 [inline]
 handle_pte_fault mm/memory.c:5766 [inline]
 __handle_mm_fault mm/memory.c:5909 [inline]
 handle_mm_fault+0x1c5d/0x2aa0 mm/memory.c:6077
 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+0x33/0x70 arch/x86/lib/copy_user_64.S:57
 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:147 [inline]
 _inline_copy_to_user include/linux/uaccess.h:197 [inline]
 _copy_to_user+0x7c/0xa0 lib/usercopy.c:26
 copy_to_user include/linux/uaccess.h:225 [inline]
 put_timespec64+0x64/0xb0 kernel/time/time.c:910
 __do_sys_clock_getres kernel/time/posix-timers.c:1279 [inline]
 __se_sys_clock_getres kernel/time/posix-timers.c:1267 [inline]
 __x64_sys_clock_getres+0x143/0x190 kernel/time/posix-timers.c:1267
 x64_sys_call+0x12a5/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:230
 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 0xffff888115ef7748 of 8 bytes by task 15773 on cpu 0:
 __vmf_anon_prepare mm/memory.c:3301 [inline]
 vmf_anon_prepare mm/internal.h:371 [inline]
 do_anonymous_page mm/memory.c:4780 [inline]
 do_pte_missing mm/memory.c:3963 [inline]
 handle_pte_fault mm/memory.c:5766 [inline]
 __handle_mm_fault mm/memory.c:5909 [inline]
 handle_mm_fault+0xd87/0x2aa0 mm/memory.c:6077
 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x3b9/0x650 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

value changed: 0x0000000000000000 -> 0xffff888114d60138

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 15773 Comm: syz.0.4489 Not tainted 6.12.0-syzkaller-00171-g23acd177540d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
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