audit: type=1804 audit(1577316109.872:144): pid=11110 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="invalid_pcr" cause="ToMToU" comm="syz-executor.3" name="/root/syzkaller-testdir758230053/syzkaller.UQqYoy/25/file0/bus" dev="ramfs" ino=44121 res=1 ip_tables: iptables: counters copy to user failed while replacing table : caps=(0x0000000000000000, 0x00000144401d7c69) len=432 data_len=0 gso_size=92 gso_type=1 ip_summed=3 ------------[ cut here ]------------ WARNING: CPU: 1 PID: 11113 at net/core/dev.c:2613 skb_warn_bad_offload.cold+0x1d7/0x454 net/core/dev.c:2613 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 11113 Comm: syz-executor.4 Not tainted 4.14.160-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 panic+0x1f9/0x42d kernel/panic.c:183 __warn.cold+0x2f/0x2f kernel/panic.c:547 report_bug+0x216/0x254 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:177 [inline] fixup_bug arch/x86/kernel/traps.c:172 [inline] do_error_trap+0x1bb/0x310 arch/x86/kernel/traps.c:295 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:963 RIP: 0010:skb_warn_bad_offload.cold+0x1d7/0x454 net/core/dev.c:2613 RSP: 0018:ffff88804f2ff0c8 EFLAGS: 00010282 RAX: 0000000000000065 RBX: ffff88804b032da8 RCX: 0000000000000000 RDX: 000000000002689c RSI: ffffffff814b9365 RDI: ffffed1009e5fe0f RBP: ffff88804f2ff118 R08: 0000000000000065 R09: ffff8880808f4c60 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff875893e0 R13: ffffffff875876e0 R14: 0000000000000000 R15: 00000000000001b0 skb_checksum_help+0x61b/0x850 net/core/dev.c:2634 checksum_tg+0x5c/0x71 net/netfilter/xt_CHECKSUM.c:29 ipt_do_table+0xafd/0x1770 net/ipv4/netfilter/ip_tables.c:353 ipt_mangle_out net/ipv4/netfilter/iptable_mangle.c:64 [inline] iptable_mangle_hook+0x2dc/0x570 net/ipv4/netfilter/iptable_mangle.c:89 nf_hook_entry_hookfn include/linux/netfilter.h:108 [inline] nf_hook_slow+0xaf/0x1b0 net/netfilter/core.c:467 nf_hook include/linux/netfilter.h:205 [inline] __ip_local_out+0x38c/0x820 net/ipv4/ip_output.c:113 ip_local_out+0x29/0x170 net/ipv4/ip_output.c:122 ip_queue_xmit+0x7d7/0x1b10 net/ipv4/ip_output.c:504 __tcp_transmit_skb+0x1721/0x2fd0 net/ipv4/tcp_output.c:1131 tcp_transmit_skb net/ipv4/tcp_output.c:1147 [inline] tcp_write_xmit+0x523/0x49b0 net/ipv4/tcp_output.c:2383 __tcp_push_pending_frames+0xa6/0x260 net/ipv4/tcp_output.c:2564 tcp_push_pending_frames include/net/tcp.h:1778 [inline] tcp_data_snd_check net/ipv4/tcp_input.c:5119 [inline] tcp_rcv_established+0x628/0x1650 net/ipv4/tcp_input.c:5566 tcp_v4_do_rcv+0x56c/0x7f0 net/ipv4/tcp_ipv4.c:1467 sk_backlog_rcv include/net/sock.h:912 [inline] __release_sock+0x12d/0x350 net/core/sock.c:2264 release_sock+0x59/0x1b0 net/core/sock.c:2779 sk_stream_wait_memory+0x4d3/0xce0 net/core/stream.c:145 tcp_sendmsg_locked+0x11e1/0x31c0 net/ipv4/tcp.c:1416 tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1457 inet_sendmsg+0x122/0x500 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xce/0x110 net/socket.c:656 SYSC_sendto+0x206/0x310 net/socket.c:1763 SyS_sendto+0x40/0x50 net/socket.c:1731 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a919 RSP: 002b:00007f1de1d80c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 000000000045a919 RDX: 0000000000008293 RSI: 0000000020000180 RDI: 0000000000000005 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000027 R10: 0000000004000002 R11: 0000000000000246 R12: 00007f1de1d816d4 R13: 00000000004c9ab3 R14: 00000000004e1a20 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds..