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AJvYcCXSdUEC9yqDN19yuxE2yi/1r61HVZa+SdkHDGV6OQj56OG9D8Dl9BRkMX1dCLac2qay8/RyWTg8kg==@kvack.org X-Gm-Message-State: AOJu0Yy5mLAiPn31f1oHYEidO+Nt6CPNQtAFih2oueeoHfYH35Q8TDKP viEVS59u2+q9tVAQc4vjMav+y4vssalSNKZ3rlvnIsElqcMZbCEiVrAhBXpdGmORzlU8OETgySN ESuUPl44ZxpgF9IKdO9JJ3xFZl4zfbPM= X-Gm-Gg: ASbGncslho3cifvNs+lawAIR1AexglR0cbHXBPxvSylLNTt2qxHbwYfNRH33iJVbvxP kvKZ1Zk0fQP7XkNdcBfROSF9C61uvvDTt3AWBU4hr4xK7Vlswk7z5/9IqlijJBVCQSOQCG31a2q D552ks1ZZreBAuz76rLjErN0kkBXd+I9qzeBIZhe8d9oRhsXxiAJm7ueqQMrtWLq/WSpQz06SYR o6WRB38QlPB/5iI7A== X-Google-Smtp-Source: AGHT+IGlyAM97ITpXb+I4johYOiMqVNP/L/7mRsJVUyDhylX/Qc4TcOFu2s16cKEM7TqfM8PRN+irC2YyyNEyde29l8= X-Received: by 2002:a05:6102:6894:b0:4e9:8f71:bd4f with SMTP id ada2fe7eead31-4fdc1b4fc32mr3381516137.3.1754301862193; Mon, 04 Aug 2025 03:04:22 -0700 (PDT) MIME-Version: 1.0 References: <20250607220150.2980-1-21cnbao@gmail.com> <1d1d97f9-2a67-4920-850e-accf4c82440e@redhat.com> <4fa8f492-c7ef-451c-8dc7-38b031c8a092@bytedance.com> <7d92ec18-ff8e-4929-8b9a-f0bf5c6d249f@bytedance.com> In-Reply-To: From: Barry Song <21cnbao@gmail.com> Date: Mon, 4 Aug 2025 22:04:11 +1200 X-Gm-Features: Ac12FXwcnY8-s17fkhP2BhhtZchoFsWJziPluE5wP1XYtcDSgD7prKLao16EDn0 Message-ID: Subject: Re: [PATCH v4] mm: use per_vma lock for MADV_DONTNEED To: Qi Zheng Cc: David Hildenbrand , akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Barry Song , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Jann Horn , Suren Baghdasaryan , Lokesh Gidra , Tangquan Zheng , yi1.lai@intel.com, "Lai, Yi" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 51018160003 X-Rspam-User: X-Rspamd-Server: rspam09 X-Stat-Signature: r7bh6omf91tewcsyd96xgfnuwmbh74hc X-HE-Tag: 1754301863-32107 X-HE-Meta: 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 zttsbwkG 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Aug 4, 2025 at 9:54=E2=80=AFPM Qi Zheng wrote: [...] > >>>> > >>> My kernel compiling steps: > >>> 1. copy kconfig_origin to kernel_source_folder/.config > >>> 2. make olddefconfig > >>> 3. make bzImage -jx > >>> > >>> I have also uploaded the actual .config during compiling. > >>> [2] https://github.com/laifryiee/syzkaller_logs/blob/ > >>> main/250803_193026___pte_offset_map_lock/.config > >>> CONFIG_ARCH_SUPPORTS_PT_RECLAIM=3Dy > >>> CONFIG_PT_RECLAIM=3Dy > >> > >> Thanks! I can reproduce the issue within one second. > > > > I also reproduced it locally. > > Hi Barry, can you reproduce this problem stably? I can't reproduce it > again after reproducing it once. :( > Yes, the issue reliably reproduces within a short time after every reboot. [root@test ~]# ./repro [ 18.189594] loop0: detected capacity change from 0 to 65536 [ 18.339652] loop0: detected capacity change from 0 to 65536 [ 18.488875] loop0: detected capacity change from 0 to 65536 [ 18.658206] loop0: detected capacity change from 0 to 65536 [ 18.793696] loop0: detected capacity change from 0 to 65536 [ 18.796660] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] SMP KASAN NOPTI [ 18.797417] KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] [ 18.797926] CPU: 0 UID: 0 PID: 635 Comm: repro Not tainted 6.16.0-next-20250801-kvm+ #3 PREEMPT(voluntary) [ 18.798568] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 [ 18.799324] RIP: 0010:kasan_byte_accessible+0x15/0x30 [ 18.799685] Code: cc 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ef 03 48 01 c7 <0f> b6 07 3c 07 0f 96 c0 c3 cc cc cc cc 66 66 2e 0f 1f 0 [ 18.800906] RSP: 0018:ffff8880136df678 EFLAGS: 00010286 [ 18.801265] RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 1ffffffff0d= de60c [ 18.801742] RDX: 0000000000000000 RSI: ffffffff85da2e18 RDI: dffffc00000= 00003 [ 18.802224] RBP: ffff8880136df698 R08: 0000000000000001 R09: 00000000000= 00000 [ 18.802702] R10: 0000000000000000 R11: ffff8880123558d8 R12: 00000000000= 00018 [ 18.803181] R13: 0000000000000018 R14: ffffffff85da2e18 R15: 00000000000= 00000 [ 18.803659] FS: 0000000000000000(0000) GS:ffff8880e3b40000(0000) knlGS:0000000000000000 [ 18.804199] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 18.804588] CR2: 00007f52bf71ffc0 CR3: 00000000119eb000 CR4: 00000000007= 50ef0 [ 18.805066] PKRU: 55555554 [ 18.805260] Call Trace: Thanks Barry