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AFNElJ8njIYoOAAa+LJwykJCHaRCPxpl+uimhSX+k/JZ3vjaEueNXplBZnjZx1YaaUtOHA4TYUiqNTh7Y2Tp5oc=@vger.kernel.org X-Gm-Message-State: AOJu0YxZ8/AsfkuDqIKpYzB9JeAJIUuYzIeAgA2QFcruRSI7LKU1GDDz OrJQk+hke9dzAm/oWKMt/571sTvFxoXsN0swWR/L+M89/EcTwlVfbNB6ICY+4nN68P0cNdPMV2G ZTj5+tJnVdxOXnPpoNQQfhpb+R6ZyG8qqmZ4WsNoxXk7DdSOO4v+CdWJzR0M= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:c0c2:20b0:69b:4bff:d0a9 with SMTP id 006d021491bc7-69b4bffd90emr3707222eaf.44.1778580482795; Tue, 12 May 2026 03:08:02 -0700 (PDT) Date: Tue, 12 May 2026 03:08:02 -0700 In-Reply-To: <88d94464-9391-49f4-848f-f359b09b0500@kernel.org> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a02fc02.050a0220.12f528.0142.GAE@google.com> Subject: Re: [syzbot] [mptcp?] KMSAN: uninit-value in mptcp_established_options From: syzbot To: glider@google.com, kuniyu@google.com, linux-kernel@vger.kernel.org, matttbe@kernel.org, mptcp@lists.linux.dev, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KMSAN: uninit-value in irqentry_exit_to_kernel_mode_preempt ===================================================== BUG: KMSAN: uninit-value in irqentry_exit_to_kernel_mode_preempt+0xb0/0xc0 include/linux/irq-entry-common.h:474 irqentry_exit_to_kernel_mode_preempt+0xb0/0xc0 include/linux/irq-entry-common.h:474 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:549 [inline] irqentry_exit+0x7b/0x820 kernel/entry/common.c:164 sysvec_apic_timer_interrupt+0x52/0x90 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:697 __msan_metadata_ptr_for_load_4+0x5/0x40 mm/kmsan/instrumentation.c:93 tcp_rcv_established+0x19bb/0x3200 net/ipv4/tcp_input.c:6656 tcp_v4_do_rcv+0xc5b/0x1b70 net/ipv4/tcp_ipv4.c:1851 sk_backlog_rcv include/net/sock.h:1190 [inline] __release_sock+0x360/0x7d0 net/core/sock.c:3216 release_sock+0x22d/0x300 net/core/sock.c:3815 mptcp_subflow_shutdown+0x358/0x690 net/mptcp/protocol.c:3144 mptcp_check_send_data_fin+0x31b/0x3d0 net/mptcp/protocol.c:3218 __mptcp_wr_shutdown net/mptcp/protocol.c:3234 [inline] __mptcp_close+0x860/0x1360 net/mptcp/protocol.c:3313 mptcp_close+0x42/0x260 net/mptcp/protocol.c:3367 inet_release+0x1ee/0x2a0 net/ipv4/af_inet.c:442 __sock_release net/socket.c:722 [inline] sock_close+0xd6/0x2f0 net/socket.c:1514 __fput+0x60e/0x1010 fs/file_table.c:510 ____fput+0x25/0x30 fs/file_table.c:538 task_work_run+0x208/0x2b0 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:67 [inline] exit_to_user_mode_loop+0x306/0x1ea0 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline] do_syscall_64+0x236/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f Local variable mp_opt created at: mptcp_incoming_options+0x11d/0x43b0 net/mptcp/options.c:1171 tcp_data_queue+0x80/0x7c90 net/ipv4/tcp_input.c:5584 CPU: 0 UID: 0 PID: 10313 Comm: syz.0.1815 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 ===================================================== Tested on: commit: 50897c95 Merge tag 'linux_kselftest-kunit-fixes-7.1-rc.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=121c20c8580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a9f364ffbbe4c1e9 dashboard link: https://syzkaller.appspot.com/bug?extid=ff020673c5e3d94d9478 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 patch: https://syzkaller.appspot.com/x/patch.diff?x=1555c7ce580000