------------[ cut here ]------------ kernel BUG at mm/kmsan/kmsan_instr.c:183! invalid opcode: 0000 [#1] SMP CPU: 1 PID: 8315 Comm: loop5 Not tainted 4.20.0-rc7+ #9 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__msan_chain_origin+0xa6/0xb0 mm/kmsan/kmsan_instr.c:181 Code: c8 ff 75 c8 9d 65 48 8b 04 25 28 00 00 00 48 3b 45 d8 75 0f 89 d8 48 83 c4 18 5b 41 5c 41 5e 41 5f 5d c3 e8 2c 0f 59 ff 0f 0b <0f> 0b 0f 1f 84 00 00 00 00 00 40 f6 c7 03 75 28 40 f6 c6 03 75 24 RSP: 0018:ffff88821fd0efb0 EFLAGS: 00010096 RAX: 00000000bd600109 RBX: 0000000000000000 RCX: 72985b45f1944e00 RDX: 0000000000000003 RSI: 0000000000480020 RDI: 00000000b6a00109 RBP: ffff88821fd0efe8 R08: 0000000000000003 R09: ffff88821fd0ed6c R10: ffffffff8ac01788 R11: 0000000000000000 R12: 0000000000000246 R13: ffff88812f021209 R14: 00000000b6a00109 R15: ffff8881531ada00 FS: 0000000000000000(0000) GS:ffff88821fd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f39ea4bfdb8 CR3: 000000012b95f000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __skb_clone+0x78a/0x990 net/core/skbuff.c:860 skb_clone+0x3e8/0x580 net/core/skbuff.c:1287 __tcp_transmit_skb+0x393/0x5ba0 net/ipv4/tcp_output.c:1041 tcp_transmit_skb net/ipv4/tcp_output.c:1176 [inline] tcp_write_xmit+0x31dd/0xa840 net/ipv4/tcp_output.c:2395 __tcp_push_pending_frames+0x124/0x4e0 net/ipv4/tcp_output.c:2571 tcp_push_pending_frames include/net/tcp.h:1775 [inline] tcp_data_snd_check+0x182/0xa20 net/ipv4/tcp_input.c:5158 tcp_rcv_established+0x1ac0/0x2850 net/ipv4/tcp_input.c:5650 tcp_v4_do_rcv+0x686/0xd70 net/ipv4/tcp_ipv4.c:1534 tcp_v4_rcv+0x6948/0x6f30 net/ipv4/tcp_ipv4.c:1826 ip_local_deliver_finish+0x7a2/0xea0 net/ipv4/ip_input.c:215 NF_HOOK include/linux/netfilter.h:289 [inline] ip_local_deliver+0x44b/0x510 net/ipv4/ip_input.c:256 dst_input include/net/dst.h:450 [inline] ip_rcv_finish net/ipv4/ip_input.c:415 [inline] NF_HOOK include/linux/netfilter.h:289 [inline] ip_rcv+0x6b6/0x740 net/ipv4/ip_input.c:524 __netif_receive_skb_one_core net/core/dev.c:4946 [inline] __netif_receive_skb net/core/dev.c:5056 [inline] process_backlog+0x766/0x10f0 net/core/dev.c:5864 napi_poll net/core/dev.c:6287 [inline] net_rx_action+0x816/0x1aa0 net/core/dev.c:6353 __do_softirq+0x53f/0x93a kernel/softirq.c:293 invoke_softirq kernel/softirq.c:375 [inline] irq_exit+0x214/0x250 kernel/softirq.c:416 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:536 smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1063 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:814 RIP: 0010:_raw_spin_unlock_irqrestore+0x4b/0x70 kernel/locking/spinlock.c:185 Code: 00 8b b8 88 0c 00 00 48 8b 00 48 85 c0 75 28 48 89 df e8 48 68 4a f7 c6 00 00 c6 03 00 4d 85 e4 75 1c 4c 89 7d d8 ff 75 d8 9d <48> 83 c4 08 5b 41 5c 41 5e 41 5f 5d c3 e8 33 71 4a f7 eb d1 44 89 RSP: 0018:ffff88812a83fe30 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: ffff88812c7bf698 RBX: ffff88812da3f698 RCX: ffff88812c7bf698 RDX: ffff88812b86f698 RSI: 0000160000000000 RDI: ccccccccccccd000 RBP: ffff88812a83fe58 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: ffffffff81494230 R12: 0000000000000000 R13: ffff88812da3f690 R14: 0000000000000000 R15: 0000000000000286 spin_unlock_irqrestore include/linux/spinlock.h:384 [inline] complete+0x10e/0x170 kernel/sched/completion.c:37 kthread+0x3c6/0x4e0 kernel/kthread.c:240 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355 Modules linked in: ---[ end trace 761a820478f656e9 ]--- RIP: 0010:__msan_chain_origin+0xa6/0xb0 mm/kmsan/kmsan_instr.c:181 Code: c8 ff 75 c8 9d 65 48 8b 04 25 28 00 00 00 48 3b 45 d8 75 0f 89 d8 48 83 c4 18 5b 41 5c 41 5e 41 5f 5d c3 e8 2c 0f 59 ff 0f 0b <0f> 0b 0f 1f 84 00 00 00 00 00 40 f6 c7 03 75 28 40 f6 c6 03 75 24 RSP: 0018:ffff88821fd0efb0 EFLAGS: 00010096 RAX: 00000000bd600109 RBX: 0000000000000000 RCX: 72985b45f1944e00 RDX: 0000000000000003 RSI: 0000000000480020 RDI: 00000000b6a00109 RBP: ffff88821fd0efe8 R08: 0000000000000003 R09: ffff88821fd0ed6c R10: ffffffff8ac01788 R11: 0000000000000000 R12: 0000000000000246 R13: ffff88812f021209 R14: 00000000b6a00109 R15: ffff8881531ada00 FS: 0000000000000000(0000) GS:ffff88821fd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f39ea4bfdb8 CR3: 000000012b95f000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400