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Thu, 27 Nov 2025 00:03:01 -0800 (PST) Date: Thu, 27 Nov 2025 00:03:01 -0800 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <692805b5.a70a0220.d98e3.00f8.GAE@google.com> Subject: Re: [syzbot] [mptcp?] WARNING in subflow_data_ready (4) From: syzbot To: linux-kernel@vger.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: WARNING in subflow_data_ready MPTCP: fallaback under lock 0 req mpc 1 req mpj 0 state 16 parent state 7 send 0 received 0 ------------[ cut here ]------------ WARNING: CPU: 1 PID: 23 at net/mptcp/subflow.c:1527 subflow_data_ready+0x59d/0x980 net/mptcp/subflow.c:1527 Modules linked in: CPU: 1 UID: 0 PID: 23 Comm: ksoftirqd/1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:subflow_data_ready+0x59d/0x980 net/mptcp/subflow.c:1527 Code: e0 48 c7 c7 c0 71 ee 8c 44 89 f9 8b 54 24 1c 48 c1 ee 02 45 0f b7 c0 83 e6 01 e8 2e 6c 51 f6 48 8b 7c 24 10 e8 44 ee 16 00 90 <0f> 0b 90 58 5a e8 e9 fb 72 f6 48 89 df e8 51 ac ff ff 31 ff 89 c5 RSP: 0018:ffffc900001d7348 EFLAGS: 00010202 RAX: 0000000000000101 RBX: ffff8880343cd940 RCX: 0000000000000002 RDX: 0000000000000000 RSI: ffffffff8da29344 RDI: ffffffff8bf078c0 RBP: ffff8880312b1538 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff90824bd7 R11: 0000000000000001 R12: ffff8880312b0c00 R13: 1ffff9200003ae70 R14: 0000000000000004 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888124b0d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6ced887d58 CR3: 0000000064f00000 CR4: 00000000003526f0 Call Trace: tcp_data_ready+0x110/0x550 net/ipv4/tcp_input.c:5355 tcp_data_queue+0x1aa6/0x5000 net/ipv4/tcp_input.c:5445 tcp_rcv_state_process+0xfb6/0x6490 net/ipv4/tcp_input.c:7159 tcp_v4_do_rcv+0x68e/0x10a0 net/ipv4/tcp_ipv4.c:1954 tcp_v4_rcv+0x3077/0x4db0 net/ipv4/tcp_ipv4.c:2374 ip_protocol_deliver_rcu+0xba/0x4c0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x3f2/0x720 net/ipv4/ip_input.c:239 NF_HOOK include/linux/netfilter.h:318 [inline] NF_HOOK include/linux/netfilter.h:312 [inline] ip_local_deliver+0x18e/0x1f0 net/ipv4/ip_input.c:260 dst_input include/net/dst.h:474 [inline] ip_rcv_finish net/ipv4/ip_input.c:453 [inline] NF_HOOK include/linux/netfilter.h:318 [inline] NF_HOOK include/linux/netfilter.h:312 [inline] ip_rcv+0x2e0/0x600 net/ipv4/ip_input.c:573 __netif_receive_skb_one_core+0x197/0x1e0 net/core/dev.c:6079 __netif_receive_skb+0x1d/0x160 net/core/dev.c:6192 process_backlog+0x439/0x15e0 net/core/dev.c:6544 __napi_poll.constprop.0+0xba/0x550 net/core/dev.c:7594 napi_poll net/core/dev.c:7657 [inline] net_rx_action+0x97f/0xef0 net/core/dev.c:7784 handle_softirqs+0x219/0x8e0 kernel/softirq.c:622 run_ksoftirqd kernel/softirq.c:1063 [inline] run_ksoftirqd+0x3a/0x60 kernel/softirq.c:1055 smpboot_thread_fn+0x3f7/0xae0 kernel/smpboot.c:160 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Tested on: commit: 8e621c9a Merge tag 'net-6.18-rc7' of git://git.kernel... git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=14916f42580000 kernel config: https://syzkaller.appspot.com/x/.config?x=1cd7f786c0f5182f dashboard link: https://syzkaller.appspot.com/bug?extid=0ff6b771b4f7a5bce83b compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=158f657c580000