Hi, I've got the following error report while running the syzkaller fuzzer:
------------[ cut here ]------------ WARNING: CPU: 1 PID: 9957 at net/ipv4/tcp.c:1766 tcp_recvmsg+0x19d7/0x26e0 net/ipv4/tcp.c:1765 Modules linked in: CPU: 1 PID: 9957 Comm: syz-executor Not tainted 4.9.0-rc4+ #352 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 ffff880065bd7788 ffffffff81b46a64 0000000000000000 0000000000000000 ffffffff8445f8e0 0000000000000000 ffff880065bd77d0 ffffffff81111387 ffff880068414980 00000000000006e6 ffffffff8445f8e0 00000000000006e6 Call Trace: [< inline >] __dump_stack lib/dump_stack.c:15 [<ffffffff81b46a64>] dump_stack+0xb3/0x10f lib/dump_stack.c:51 [<ffffffff81111387>] __warn+0x1a7/0x1f0 kernel/panic.c:550 [<ffffffff8111159c>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585 [<ffffffff830a95b7>] tcp_recvmsg+0x19d7/0x26e0 net/ipv4/tcp.c:1765 [<ffffffff83171e28>] inet_recvmsg+0x308/0x4b0 net/ipv4/af_inet.c:765 [< inline >] sock_recvmsg_nosec net/socket.c:708 [<ffffffff82b6fb29>] sock_recvmsg+0xd9/0x110 net/socket.c:715 [<ffffffff82b6fda7>] sock_read_iter+0x247/0x360 net/socket.c:792 [<ffffffff8151e2db>] do_iter_readv_writev+0x2bb/0x3f0 fs/read_write.c:695 [<ffffffff81520141>] do_readv_writev+0x431/0x730 fs/read_write.c:872 [<ffffffff815204cc>] vfs_readv+0x8c/0xc0 fs/read_write.c:898 [<ffffffff815205e1>] do_readv+0xe1/0x240 fs/read_write.c:924 [< inline >] SYSC_readv fs/read_write.c:1011 [<ffffffff815238b7>] SyS_readv+0x27/0x30 fs/read_write.c:1008 [<ffffffff83fc1501>] entry_SYSCALL_64_fastpath+0x1f/0xc2 arch/x86/entry/entry_64.S:209 ---[ end trace 8efae7c5dcb2bd76 ]--- On commit bc33b0ca11e3df467777a4fa7639ba488c9d4911 (Nov 5). Thanks!
