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Wed, 18 Mar 2026 03:42:59 -0700 (PDT) MIME-Version: 1.0 From: Jiakai Xu Date: Wed, 18 Mar 2026 18:42:49 +0800 X-Gm-Features: AaiRm50KzGeGk4U1ssZVimavxVmOrvZRNHAY-bomh3FvQZNpLi6C2Zya0jD92cM Message-ID: Subject: [BUG] WARNING in unlink_anon_vmas() To: LKML , linux-mm@kvack.org Cc: Liam.Howlett@oracle.com, akpm@linux-foundation.org, david@kernel.org, harry.yoo@oracle.com, jannh@google.com, lorenzo.stoakes@oracle.com, riel@surriel.com, vbabka@kernel.org Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Stat-Signature: 6ztbg9adtngo1oj9b8i5cksg7yxpp8sj X-Rspamd-Queue-Id: BC3284000B X-Rspamd-Server: rspam03 X-HE-Tag: 1773830580-369463 X-HE-Meta: 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 Dig9a+/Q 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hi all, While fuzzing the KVM subsystem on RISC-V, I stumbled upon a kernel WARNING that triggers in unlink_anon_vmas(). WARNING: mm/rmap.c:528 at unlink_anon_vmas+0x562/0x768 mm/rmap.c:528 unlink_anon_vmas+0x562/0x768 mm/rmap.c:528 free_pgtables+0x2a0/0x860 mm/memory.c:427 exit_mmap+0x406/0xd14 mm/mmap.c:1314 __mmput+0x114/0x3d4 kernel/fork.c:1174 mmput+0x74/0x88 kernel/fork.c:1197 exit_mm kernel/exit.c:581 [inline] do_exit+0x7de/0x2adc kernel/exit.c:959 do_group_exit+0xd4/0x26c kernel/exit.c:1112 __do_sys_exit_group kernel/exit.c:1123 [inline] __se_sys_exit_group kernel/exit.c:1121 [inline] __riscv_sys_exit_group+0x4a/0x54 kernel/exit.c:1121 syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:112 do_trap_ecall_u+0x39e/0x62e arch/riscv/kernel/traps.c:344 handle_exception+0x15e/0x16a arch/riscv/kernel/entry.S:232 I am not an expert in this area and have not done a deep manual analysis. The full crash log, a reproducer, the kernel .config, and the relevant source/commit info are available in my GitHub repository: https://github.com/j1akai/temp/tree/main/20260318 If this turns out to be a real bug and there is anything I can do to help with fixing or testing, I am happy to do so. I hope this report is useful and sorry for any noise if it has already been addressed. Thanks, Jiakai