syzbot

------------[ cut here ]------------
WARNING: CPU: 0 PID: 2076 at net/packet/af_packet.c:4167 packet_set_ring+0x13f1/0x1940 net/packet/af_packet.c:4167()
Tx-ring is not supported.
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 2076 Comm: syz-executor764 Not tainted 4.4.174+ #4
 0000000000000000 70ae5d9f4aa68229 ffff8800b6ecf988 ffffffff81aad1a1
 ffff8800b6ecfad8 ffffffff82835ee0 ffffffff82ab2b80 0000000000001047
 ffffffff826d3941 ffff8800b6ecfa68 ffffffff813a48c2 0000000041b58ab3
Call Trace:
 [<ffffffff81aad1a1>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81aad1a1>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<ffffffff813a48c2>] panic+0x1b9/0x37b kernel/panic.c:112
 [<ffffffff813a4ab9>] warn_slowpath_common kernel/panic.c:455 [inline]
 [<ffffffff813a4ab9>] warn_slowpath_common.cold+0x20/0x20 kernel/panic.c:435
 [<ffffffff810d394f>] warn_slowpath_fmt+0xbf/0x100 kernel/panic.c:471
 [<ffffffff826d3941>] packet_set_ring+0x13f1/0x1940 net/packet/af_packet.c:4167
 [<ffffffff826d4cdf>] packet_setsockopt+0x2af/0x26c0 net/packet/af_packet.c:3610
 [<ffffffff821dcb59>] SYSC_setsockopt net/socket.c:1780 [inline]
 [<ffffffff821dcb59>] SyS_setsockopt+0x159/0x240 net/socket.c:1759
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
Kernel Offset: disabled
Rebooting in 86400 seconds..