syzbot

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BUG: KCSAN: data-race in __se_sys_mremap / vma_complete

read-write to 0xffff88810411b0c8 of 4 bytes by task 8190 on cpu 0:
 vma_complete+0x13f/0x580 mm/vma.c:349
 __split_vma+0x59b/0x660 mm/vma.c:561
 split_vma mm/vma.c:591 [inline]
 vma_modify+0xb53/0xd50 mm/vma.c:1626
 vma_modify_policy+0x101/0x130 mm/vma.c:1689
 mbind_range+0x1b8/0x440 mm/mempolicy.c:1053
 do_mbind mm/mempolicy.c:1555 [inline]
 kernel_mbind mm/mempolicy.c:1752 [inline]
 __do_sys_mbind mm/mempolicy.c:1826 [inline]
 __se_sys_mbind+0x648/0xac0 mm/mempolicy.c:1822
 __x64_sys_mbind+0x78/0x90 mm/mempolicy.c:1822
 x64_sys_call+0x2a2b/0x3000 arch/x86/include/generated/asm/syscalls_64.h:238
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88810411b0c8 of 4 bytes by task 8192 on cpu 1:
 check_mremap_params mm/mremap.c:1820 [inline]
 do_mremap mm/mremap.c:1924 [inline]
 __do_sys_mremap mm/mremap.c:1997 [inline]
 __se_sys_mremap+0x420/0xb30 mm/mremap.c:1965
 __x64_sys_mremap+0x67/0x80 mm/mremap.c:1965
 x64_sys_call+0x2944/0x3000 arch/x86/include/generated/asm/syscalls_64.h:26
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000025 -> 0x00000026

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 8192 Comm: syz.3.1158 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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