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Message-ID: <000000000000d1dd99061d4a0af4@google.com> Date: Mon, 15 Jul 2024 07:28:26 -0700 From: syzbot <syzbot+d1bff73460e33101f0e7@...kaller.appspotmail.com> To: davem@...emloft.net, edumazet@...gle.com, geliang@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org, martineau@...nel.org, matttbe@...nel.org, mptcp@...ts.linux.dev, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com Subject: [syzbot] [mptcp?] WARNING in __mptcp_move_skbs_from_subflow Hello, syzbot found the following issue on: HEAD commit: d0d0cd380055 Merge tag '6.10-rc7-smb3-client-fix' of git:/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1320b879980000 kernel config: https://syzkaller.appspot.com/x/.config?x=84344463c2ebf8a1 dashboard link: https://syzkaller.appspot.com/bug?extid=d1bff73460e33101f0e7 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-d0d0cd38.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/501bce8ef014/vmlinux-d0d0cd38.xz kernel image: https://storage.googleapis.com/syzbot-assets/8cca4ce21aed/bzImage-d0d0cd38.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d1bff73460e33101f0e7@...kaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 0 PID: 20604 at net/mptcp/protocol.c:693 __mptcp_move_skbs_from_subflow+0x1677/0x2500 net/mptcp/protocol.c:693 Modules linked in: CPU: 0 PID: 20604 Comm: syz.3.4228 Not tainted 6.10.0-rc7-syzkaller-00256-gd0d0cd380055 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:__mptcp_move_skbs_from_subflow+0x1677/0x2500 net/mptcp/protocol.c:693 Code: 85 04 0e 00 00 c6 43 7f 00 e9 fd ef ff ff e8 b0 e4 d0 f6 90 0f 0b 90 e9 d0 f0 ff ff 4c 8b ac 24 90 00 00 00 e8 9a e4 d0 f6 90 <0f> 0b 90 e9 ae f2 ff ff e8 8c e4 d0 f6 90 0f 0b 90 e9 28 eb ff ff RSP: 0018:ffffc90000007498 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 00000000000081e5 RCX: ffffffff8abd9c87 RDX: ffff88801ed74880 RSI: ffffffff8abdaa86 RDI: 0000000000000004 RBP: 00000000000055f0 R08: 0000000000000004 R09: 00000000000081e5 R10: 00000000000055f0 R11: 0000000000000007 R12: ffff88805b1ce2e8 R13: ffffc900000075c0 R14: ffff88805b1ce200 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88802c000000(0063) knlGS:00000000f5d5fb40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000020287000 CR3: 000000001c02c000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> move_skbs_to_msk net/mptcp/protocol.c:809 [inline] mptcp_data_ready+0x2c5/0x960 net/mptcp/protocol.c:854 subflow_data_ready+0x51d/0x7d0 net/mptcp/subflow.c:1465 tcp_data_ready+0x146/0x5b0 net/ipv4/tcp_input.c:5177 tcp_data_queue+0x1a6f/0x5270 net/ipv4/tcp_input.c:5267 tcp_rcv_established+0x8e9/0x21b0 net/ipv4/tcp_input.c:6210 tcp_v4_do_rcv+0x707/0xab0 net/ipv4/tcp_ipv4.c:1909 tcp_v4_rcv+0x2eb4/0x3c00 net/ipv4/tcp_ipv4.c:2345 ip_protocol_deliver_rcu+0xba/0x4e0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x316/0x570 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] ip_local_deliver+0x18e/0x1f0 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:460 [inline] ip_rcv_finish net/ipv4/ip_input.c:449 [inline] NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] ip_rcv+0x2c5/0x5d0 net/ipv4/ip_input.c:569 __netif_receive_skb_one_core+0x199/0x1e0 net/core/dev.c:5625 __netif_receive_skb+0x1d/0x160 net/core/dev.c:5739 process_backlog+0x133/0x760 net/core/dev.c:6068 __napi_poll.constprop.0+0xb7/0x550 net/core/dev.c:6722 napi_poll net/core/dev.c:6791 [inline] net_rx_action+0x9b6/0xf10 net/core/dev.c:6907 handle_softirqs+0x216/0x8f0 kernel/softirq.c:554 do_softirq kernel/softirq.c:455 [inline] do_softirq+0xb2/0xf0 kernel/softirq.c:442 </IRQ> <TASK> __local_bh_enable_ip+0x100/0x120 kernel/softirq.c:382 local_bh_enable include/linux/bottom_half.h:33 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:851 [inline] __dev_queue_xmit+0x872/0x4130 net/core/dev.c:4420 dev_queue_xmit include/linux/netdevice.h:3095 [inline] neigh_hh_output include/net/neighbour.h:526 [inline] neigh_output include/net/neighbour.h:540 [inline] ip_finish_output2+0x16bf/0x2590 net/ipv4/ip_output.c:235 __ip_finish_output net/ipv4/ip_output.c:313 [inline] __ip_finish_output+0x49e/0x950 net/ipv4/ip_output.c:295 ip_finish_output+0x31/0x310 net/ipv4/ip_output.c:323 NF_HOOK_COND include/linux/netfilter.h:303 [inline] ip_output+0x13b/0x2a0 net/ipv4/ip_output.c:433 dst_output include/net/dst.h:450 [inline] ip_local_out+0x33e/0x4a0 net/ipv4/ip_output.c:129 __ip_queue_xmit+0x747/0x1940 net/ipv4/ip_output.c:535 __tcp_transmit_skb+0x29c1/0x3da0 net/ipv4/tcp_output.c:1466 tcp_transmit_skb net/ipv4/tcp_output.c:1484 [inline] tcp_mtu_probe net/ipv4/tcp_output.c:2546 [inline] tcp_write_xmit+0x83f4/0x87e0 net/ipv4/tcp_output.c:2751 __tcp_push_pending_frames+0xaf/0x390 net/ipv4/tcp_output.c:3014 tcp_push_pending_frames include/net/tcp.h:2102 [inline] tcp_data_snd_check net/ipv4/tcp_input.c:5693 [inline] tcp_rcv_established+0x972/0x21b0 net/ipv4/tcp_input.c:6212 tcp_v4_do_rcv+0x707/0xab0 net/ipv4/tcp_ipv4.c:1909 sk_backlog_rcv include/net/sock.h:1106 [inline] __release_sock+0x31b/0x400 net/core/sock.c:2983 release_sock+0x5a/0x220 net/core/sock.c:3549 __mptcp_push_pending+0x400/0x560 net/mptcp/protocol.c:1623 mptcp_sendmsg+0xce5/0x1f20 net/mptcp/protocol.c:1901 inet_sendmsg+0x119/0x140 net/ipv4/af_inet.c:853 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] __sys_sendto+0x42c/0x4e0 net/socket.c:2192 __do_sys_sendto net/socket.c:2204 [inline] __se_sys_sendto net/socket.c:2200 [inline] __ia32_sys_sendto+0xdd/0x1b0 net/socket.c:2200 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7447579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f5d5f57c EFLAGS: 00000292 ORIG_RAX: 0000000000000171 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000200000c0 RDX: 00000000fffffe44 RSI: 0000000004000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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