===================================================== BUG: KMSAN: uninit-value in dev_gro_receive+0x26e6/0x32e0 net/core/dev.c:5577 CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-rc2+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x191/0x1f0 lib/dump_stack.c:113 kmsan_report+0x153/0x2c0 mm/kmsan/kmsan_report.c:113 __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:250 pskb_may_pull include/linux/skbuff.h:2269 [inline] skb_gro_header_slow include/linux/netdevice.h:2696 [inline] inet_gro_receive+0x448/0x1a40 net/ipv4/af_inet.c:1423 dev_gro_receive+0x26e6/0x32e0 net/core/dev.c:5577 napi_gro_receive+0x5fc/0xbb0 net/core/dev.c:5710 gro_cell_poll+0x25c/0x3f0 net/core/gro_cells.c:60 napi_poll net/core/dev.c:6392 [inline] net_rx_action+0x7a6/0x1aa0 net/core/dev.c:6460 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 run_ksoftirqd+0x25/0x40 kernel/softirq.c:607 smpboot_thread_fn+0x4a3/0x990 kernel/smpboot.c:165 kthread+0x4b5/0x4f0 kernel/kthread.c:256 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:154 [inline] kmsan_internal_chain_origin+0xde/0x190 mm/kmsan/kmsan.c:329 __msan_chain_origin+0x6b/0xe0 mm/kmsan/kmsan_instr.c:184 __skb_pull include/linux/skbuff.h:2241 [inline] skb_pull_inline include/linux/skbuff.h:2248 [inline] eth_type_trans+0x683/0xa90 net/ethernet/eth.c:165 ip_tunnel_rcv+0xf47/0x1be0 net/ipv4/ip_tunnel.c:416 erspan_rcv net/ipv4/ip_gre.c:321 [inline] gre_rcv+0x1526/0x1900 net/ipv4/ip_gre.c:415 gre_rcv+0x2dd/0x3c0 net/ipv4/gre_demux.c:155 ip_protocol_deliver_rcu+0x70f/0xbd0 net/ipv4/ip_input.c:204 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] ip_local_deliver+0x62a/0x7c0 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish net/ipv4/ip_input.c:413 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] ip_rcv+0x6c5/0x740 net/ipv4/ip_input.c:523 __netif_receive_skb_one_core net/core/dev.c:5010 [inline] __netif_receive_skb net/core/dev.c:5124 [inline] process_backlog+0xef5/0x1410 net/core/dev.c:5955 napi_poll net/core/dev.c:6392 [inline] net_rx_action+0x7a6/0x1aa0 net/core/dev.c:6460 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 do_softirq_own_stack+0x49/0x80 arch/x86/entry/entry_64.S:1093 do_softirq kernel/softirq.c:338 [inline] __local_bh_enable_ip+0x184/0x1d0 kernel/softirq.c:190 local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32 rcu_read_unlock_bh include/linux/rcupdate.h:688 [inline] ip_finish_output2+0x20ec/0x25d0 net/ipv4/ip_output.c:229 ip_do_fragment+0x2d6e/0x35f0 net/ipv4/ip_output.c:849 ip_fragment+0x246/0x410 net/ipv4/ip_output.c:587 __ip_finish_output+0xd8b/0xda0 net/ipv4/ip_output.c:306 ip_finish_output+0x2db/0x420 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip_output+0x541/0x610 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:436 [inline] ip_local_out net/ipv4/ip_output.c:125 [inline] ip_send_skb+0x179/0x360 net/ipv4/ip_output.c:1555 udp_send_skb+0x13fe/0x1910 net/ipv4/udp.c:891 udp_push_pending_frames net/ipv4/udp.c:919 [inline] udp_sendmsg+0x925/0x4190 net/ipv4/udp.c:1210 inet_sendmsg+0x276/0x2e0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg net/socket.c:657 [inline] sock_write_iter+0x599/0x650 net/socket.c:989 call_write_iter include/linux/fs.h:1895 [inline] new_sync_write fs/read_write.c:483 [inline] __vfs_write+0xa2c/0xcb0 fs/read_write.c:496 vfs_write+0x481/0x920 fs/read_write.c:558 ksys_write+0x265/0x430 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write+0x92/0xb0 fs/read_write.c:620 __x64_sys_write+0x4a/0x70 fs/read_write.c:620 do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:154 [inline] kmsan_internal_chain_origin+0xde/0x190 mm/kmsan/kmsan.c:329 __msan_chain_origin+0x6b/0xe0 mm/kmsan/kmsan_instr.c:184 __skb_pull include/linux/skbuff.h:2241 [inline] skb_pull_rcsum+0x2d4/0x500 net/core/skbuff.c:3622 __iptunnel_pull_header+0x14d/0xbc0 net/ipv4/ip_tunnel_core.c:94 erspan_rcv net/ipv4/ip_gre.c:279 [inline] gre_rcv+0x6d9/0x1900 net/ipv4/ip_gre.c:415 gre_rcv+0x2dd/0x3c0 net/ipv4/gre_demux.c:155 ip_protocol_deliver_rcu+0x70f/0xbd0 net/ipv4/ip_input.c:204 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] ip_local_deliver+0x62a/0x7c0 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish net/ipv4/ip_input.c:413 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] ip_rcv+0x6c5/0x740 net/ipv4/ip_input.c:523 __netif_receive_skb_one_core net/core/dev.c:5010 [inline] __netif_receive_skb net/core/dev.c:5124 [inline] process_backlog+0xef5/0x1410 net/core/dev.c:5955 napi_poll net/core/dev.c:6392 [inline] net_rx_action+0x7a6/0x1aa0 net/core/dev.c:6460 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 do_softirq_own_stack+0x49/0x80 arch/x86/entry/entry_64.S:1093 do_softirq kernel/softirq.c:338 [inline] __local_bh_enable_ip+0x184/0x1d0 kernel/softirq.c:190 local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32 rcu_read_unlock_bh include/linux/rcupdate.h:688 [inline] ip_finish_output2+0x20ec/0x25d0 net/ipv4/ip_output.c:229 ip_do_fragment+0x2d6e/0x35f0 net/ipv4/ip_output.c:849 ip_fragment+0x246/0x410 net/ipv4/ip_output.c:587 __ip_finish_output+0xd8b/0xda0 net/ipv4/ip_output.c:306 ip_finish_output+0x2db/0x420 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip_output+0x541/0x610 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:436 [inline] ip_local_out net/ipv4/ip_output.c:125 [inline] ip_send_skb+0x179/0x360 net/ipv4/ip_output.c:1555 udp_send_skb+0x13fe/0x1910 net/ipv4/udp.c:891 udp_push_pending_frames net/ipv4/udp.c:919 [inline] udp_sendmsg+0x925/0x4190 net/ipv4/udp.c:1210 inet_sendmsg+0x276/0x2e0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg net/socket.c:657 [inline] sock_write_iter+0x599/0x650 net/socket.c:989 call_write_iter include/linux/fs.h:1895 [inline] new_sync_write fs/read_write.c:483 [inline] __vfs_write+0xa2c/0xcb0 fs/read_write.c:496 vfs_write+0x481/0x920 fs/read_write.c:558 ksys_write+0x265/0x430 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write+0x92/0xb0 fs/read_write.c:620 __x64_sys_write+0x4a/0x70 fs/read_write.c:620 do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:154 [inline] kmsan_internal_chain_origin+0xde/0x190 mm/kmsan/kmsan.c:329 kmsan_memcpy_memmove_metadata+0x25c/0x2e0 mm/kmsan/kmsan.c:255 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:275 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:129 pskb_expand_head+0x38a/0x19f0 net/core/skbuff.c:1637 __skb_cow include/linux/skbuff.h:3105 [inline] skb_cow_head include/linux/skbuff.h:3139 [inline] ip_tunnel_xmit+0x2974/0x3320 net/ipv4/ip_tunnel.c:811 __gre_xmit net/ipv4/ip_gre.c:444 [inline] erspan_xmit+0x1ef8/0x35c0 net/ipv4/ip_gre.c:679 __netdev_start_xmit include/linux/netdevice.h:4420 [inline] netdev_start_xmit include/linux/netdevice.h:4434 [inline] xmit_one net/core/dev.c:3280 [inline] dev_hard_start_xmit+0x51a/0xab0 net/core/dev.c:3296 sch_direct_xmit+0x56c/0x18c0 net/sched/sch_generic.c:314 __dev_xmit_skb net/core/dev.c:3481 [inline] __dev_queue_xmit+0x212d/0x4200 net/core/dev.c:3842 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3906 neigh_resolve_output+0xab7/0xb50 net/core/neighbour.c:1490 neigh_output include/net/neighbour.h:511 [inline] ip_finish_output2+0x1a9c/0x25d0 net/ipv4/ip_output.c:228 ip_do_fragment+0x2d6e/0x35f0 net/ipv4/ip_output.c:849 ip_fragment+0x246/0x410 net/ipv4/ip_output.c:587 __ip_finish_output+0xd8b/0xda0 net/ipv4/ip_output.c:306 ip_finish_output+0x2db/0x420 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip_output+0x541/0x610 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:436 [inline] ip_local_out net/ipv4/ip_output.c:125 [inline] ip_send_skb+0x179/0x360 net/ipv4/ip_output.c:1555 udp_send_skb+0x13fe/0x1910 net/ipv4/udp.c:891 udp_push_pending_frames net/ipv4/udp.c:919 [inline] udp_sendmsg+0x925/0x4190 net/ipv4/udp.c:1210 inet_sendmsg+0x276/0x2e0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg net/socket.c:657 [inline] sock_write_iter+0x599/0x650 net/socket.c:989 call_write_iter include/linux/fs.h:1895 [inline] new_sync_write fs/read_write.c:483 [inline] __vfs_write+0xa2c/0xcb0 fs/read_write.c:496 vfs_write+0x481/0x920 fs/read_write.c:558 ksys_write+0x265/0x430 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write+0x92/0xb0 fs/read_write.c:620 __x64_sys_write+0x4a/0x70 fs/read_write.c:620 do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:154 [inline] kmsan_internal_poison_shadow+0x60/0x120 mm/kmsan/kmsan.c:137 kmsan_slab_alloc+0xaa/0x120 mm/kmsan/kmsan_hooks.c:103 slab_alloc_node mm/slub.c:2792 [inline] __kmalloc_node_track_caller+0xb55/0x1320 mm/slub.c:4390 __kmalloc_reserve net/core/skbuff.c:141 [inline] __alloc_skb+0x306/0xa10 net/core/skbuff.c:209 alloc_skb include/linux/skbuff.h:1050 [inline] alloc_skb_with_frags+0x18c/0xa80 net/core/skbuff.c:5659 sock_alloc_send_pskb+0xafd/0x10a0 net/core/sock.c:2240 sock_alloc_send_skb+0xca/0xe0 net/core/sock.c:2257 __ip_append_data+0x375d/0x52c0 net/ipv4/ip_output.c:1087 ip_append_data+0x324/0x480 net/ipv4/ip_output.c:1310 udp_sendmsg+0x6d2/0x4190 net/ipv4/udp.c:1204 inet_sendmsg+0x276/0x2e0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg net/socket.c:657 [inline] ___sys_sendmsg+0x12c4/0x1590 net/socket.c:2311 __sys_sendmsg net/socket.c:2356 [inline] __do_sys_sendmsg net/socket.c:2365 [inline] __se_sys_sendmsg+0x305/0x460 net/socket.c:2363 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2363 do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 =====================================================