From mboxrd@z Thu Jan  1 00:00:00 1970
Content-Type: multipart/mixed; boundary="===============6791825583879689293=="
MIME-Version: 1.0
From: Christoph Paasch <cpaasch at apple.com>
To: mptcp at lists.01.org
Subject: [MPTCP] [syzkaller] WARNING: CPU: 0 PID: 9 at
 net/mptcp/protocol.c:200 __mptcp_move_skbs_from_subflow+0x371/0x4a0
 net/mptcp/protocol.c:200
Date: Tue, 24 Mar 2020 18:39:43 -0700
Message-ID: <20200325013943.GC3854@MacBook-Pro-64.local>
X-Status: 
X-Keywords:                  
X-UID: 4061

--===============6791825583879689293==
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MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable

Hello,

yet another one:

------------[ cut here ]------------
WARNING: CPU: 0 PID: 9 at net/mptcp/protocol.c:200 __mptcp_move_skbs_from_s=
ubflow+0x371/0x4a0 net/mptcp/protocol.c:200
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.6.0-rc5 #62
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga=
5cab58e9a3f-prebuilt.qemu.org 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xda/0x116 lib/dump_stack.c:118
 panic+0x1ae/0x509 kernel/panic.c:221
 __warn.cold+0x2a/0x2e kernel/panic.c:582
 report_bug+0x1a9/0x1e0 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 fixup_bug arch/x86/kernel/traps.c:169 [inline]
 do_error_trap+0x97/0xc0 arch/x86/kernel/traps.c:267
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:286
 invalid_op+0x1e/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:__mptcp_move_skbs_from_subflow+0x371/0x4a0 net/mptcp/protocol.c:2=
00
Code: 00 01 41 89 44 24 28 8b 45 b8 03 45 a8 41 01 c7 44 2b 7d ac 44 89 fe =
e8 ad d5 2e ff 44 39 fb 0f 86 0c fe ff ff e8 9f d4 2e ff <0f> 0b e9 51 fe f=
f ff e8 93 d4 2e ff 49 83 be c8 00 00 00 00 0f 85
RSP: 0018:ffffc900000679e0 EFLAGS: 00010206
RAX: ffff88807d525040 RBX: 0000000000007fc9 RCX: ffffffff81faa183
RDX: 0000000000000100 RSI: ffffffff81faa191 RDI: 0000000000000004
RBP: ffffc90000067a48 R08: ffff88807d525040 R09: 000000006215a4a4
R10: 0000000036cc3e18 R11: 00000000f697ff28 R12: ffff888052c6ad18
R13: ffff8880539a06c0 R14: ffff888055e98080 R15: 0000000000007fc8
 move_skbs_to_msk+0xe6/0xf0 net/mptcp/protocol.c:238
 mptcp_data_ready+0xa8/0x150 net/mptcp/protocol.c:252
 subflow_data_ready+0x8a/0xa0 net/mptcp/subflow.c:774
 tcp_data_ready net/ipv4/tcp_input.c:4767 [inline]
 tcp_data_queue+0x692/0x15b0 net/ipv4/tcp_input.c:4833
 tcp_rcv_established+0x302/0xae0 net/ipv4/tcp_input.c:5727
 tcp_v4_do_rcv+0x231/0x350 net/ipv4/tcp_ipv4.c:1621
 tcp_v4_rcv+0x10da/0x1220 net/ipv4/tcp_ipv4.c:2003
 ip_protocol_deliver_rcu+0x20/0x130 net/ipv4/ip_input.c:204
 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline]
 NF_HOOK include/linux/netfilter.h:421 [inline]
 ip_local_deliver+0xe0/0x100 net/ipv4/ip_input.c:252
 dst_input include/net/dst.h:442 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:428 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:414 [inline]
 NF_HOOK include/linux/netfilter.h:421 [inline]
 ip_rcv+0x70/0xa0 net/ipv4/ip_input.c:538
 __netif_receive_skb_one_core+0x68/0xa0 net/core/dev.c:5187
 __netif_receive_skb+0x2a/0xa0 net/core/dev.c:5301
 process_backlog+0x104/0x250 net/core/dev.c:6133
 napi_poll net/core/dev.c:6571 [inline]
 net_rx_action+0x14a/0x520 net/core/dev.c:6639
 __do_softirq+0x115/0x33f kernel/softirq.c:292
 run_ksoftirqd+0x46/0x60 kernel/softirq.c:603
 smpboot_thread_fn+0x297/0x390 kernel/smpboot.c:165
 kthread+0x153/0x180 kernel/kthread.c:255
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 1 seconds..


On top of 402d1b0dc2e1 ("mptcp: re-check dsn before reading from subflow")

syzkaller-repro:
# {Threaded:true Collide:false Repeat:true RepeatTimes:0 Procs:1 Sandbox:no=
ne Fault:false FaultCall:-1 FaultNth:0 Leak:false NetInjection:true NetDevi=
ces:true NetReset:false Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:fa=
lse DevlinkPCI:false UseTmpDir:true HandleSegv:false Repro:false Trace:fals=
e}
r0 =3D socket$inet_mptcp(0x2, 0x1, 0x106)
r1 =3D socket$inet_mptcp(0x2, 0x1, 0x106)
bind$inet(r1, &(0x7f00000013c0)=3D{0x2, 0x4e20, @multicast2}, 0x10)
connect$inet(r1, &(0x7f0000000040)=3D{0x2, 0x0, @loopback}, 0x10)
listen(r1, 0x3)
r2 =3D socket$inet6_tcp(0xa, 0x1, 0x0)
ioctl$sock_SIOCGIFVLAN_SET_VLAN_NAME_TYPE_CMD(r2, 0x8982, 0x0)
connect$inet(r0, &(0x7f0000000040)=3D{0x2, 0x4e20, @loopback}, 0x4d)
sendmsg$inet(r0, &(0x7f0000000280)=3D{0x0, 0x0, &(0x7f0000000000)=3D[{&(0x7=
f0000000080)=3D"ff", 0xff3e}], 0x1}, 0x0)


C-repro is attached.


Christoph





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--===============6791825583879689293==--