================================================================== BUG: KMSAN: uninit-value in inet_gro_receive+0x166c/0x1950 net/ipv4/af_inet.c:1418 CPU: 0 PID: 4503 Comm: syz-executor6 Not tainted 4.17.0+ #9 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+0x185/0x1d0 lib/dump_stack.c:113 kmsan_report+0x188/0x2a0 mm/kmsan/kmsan.c:1125 __msan_warning_32+0x70/0xc0 mm/kmsan/kmsan_instr.c:620 inet_gro_receive+0x166c/0x1950 net/ipv4/af_inet.c:1418 dev_gro_receive+0x214c/0x32e0 net/core/dev.c:4989 napi_gro_receive+0x624/0xb60 net/core/dev.c:5124 gro_cell_poll+0x28e/0x410 net/core/gro_cells.c:46 napi_poll net/core/dev.c:5735 [inline] net_rx_action+0x766/0x1a80 net/core/dev.c:5801 __do_softirq+0x592/0x979 kernel/softirq.c:285 invoke_softirq kernel/softirq.c:365 [inline] irq_exit+0x202/0x240 kernel/softirq.c:405 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:525 smp_apic_timer_interrupt+0x64/0x90 arch/x86/kernel/apic/apic.c:1055 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:866 RIP: 0010:memset_erms+0xb/0x10 arch/x86/lib/memset_64.S:66 RSP: 0018:ffff880127e1fb18 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: ffff880127e2fbff RBX: ffff880127e1fbd8 RCX: 0000000000000000 RDX: 0000000000000008 RSI: 00000000ffffffff RDI: ffff880127e2fbe0 RBP: ffff880127e1fbc0 R08: 0000000001080020 R09: ffff880127e2fbd8 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000008 R13: ffffffff8ac80ca0 R14: 0000000000000008 R15: ffff880194deba80 _raw_spin_lock_irqsave+0x45/0xf0 kernel/locking/spinlock.c:150 lock_hrtimer_base kernel/time/hrtimer.c:174 [inline] hrtimer_start_range_ns+0x1f2/0x17a0 kernel/time/hrtimer.c:1113 hrtimer_start_expires include/linux/hrtimer.h:412 [inline] do_nanosleep+0x24b/0x9c0 kernel/time/hrtimer.c:1686 hrtimer_nanosleep kernel/time/hrtimer.c:1743 [inline] __do_sys_nanosleep kernel/time/hrtimer.c:1775 [inline] __se_sys_nanosleep+0x4b3/0x6a0 kernel/time/hrtimer.c:1762 __x64_sys_nanosleep+0x92/0xc0 kernel/time/hrtimer.c:1762 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x481230 RSP: 002b:0000000000a3ea98 EFLAGS: 00000246 ORIG_RAX: 0000000000000023 RAX: ffffffffffffffda RBX: 000000000000000d RCX: 0000000000481230 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000a3eaa0 RBP: 0000000000016f4d R08: 0000000000000001 R09: 0000000001751940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000007 R14: 0000000000000128 R15: 0000000000016ef4 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:282 [inline] kmsan_save_stack mm/kmsan/kmsan.c:297 [inline] kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:689 kmsan_memcpy_origins+0x11d/0x170 mm/kmsan/kmsan.c:530 __msan_memcpy+0x109/0x160 mm/kmsan/kmsan_instr.c:413 pskb_expand_head+0x3a6/0x1a70 net/core/skbuff.c:1470 __pskb_pull_tail+0x1d7/0x2310 net/core/skbuff.c:1881 __skb_linearize include/linux/skbuff.h:3029 [inline] skb_checksum_help+0x250/0xb40 net/core/dev.c:2686 skb_csum_hwoffload_help net/core/dev.c:3103 [inline] validate_xmit_skb+0x10fb/0x1320 net/core/dev.c:3142 __dev_queue_xmit+0x2370/0x3540 net/core/dev.c:3576 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3617 neigh_hh_output include/net/neighbour.h:472 [inline] neigh_output include/net/neighbour.h:480 [inline] ip_finish_output2+0x12a8/0x1480 net/ipv4/ip_output.c:229 ip_finish_output+0xcbc/0x1000 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:277 [inline] ip_output+0x505/0x5d0 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:444 [inline] ip_local_out+0x164/0x1d0 net/ipv4/ip_output.c:124 iptunnel_xmit+0x854/0xdb0 net/ipv4/ip_tunnel_core.c:91 ip_tunnel_xmit+0x3422/0x37c0 net/ipv4/ip_tunnel.c:778 ipip_tunnel_xmit+0x32b/0x4c0 net/ipv4/ipip.c:308 __netdev_start_xmit include/linux/netdevice.h:4087 [inline] netdev_start_xmit include/linux/netdevice.h:4096 [inline] xmit_one net/core/dev.c:3053 [inline] dev_hard_start_xmit+0x5f6/0xc80 net/core/dev.c:3069 __dev_queue_xmit+0x2ad2/0x3540 net/core/dev.c:3584 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3617 neigh_direct_output+0x42/0x50 net/core/neighbour.c:1398 neigh_output include/net/neighbour.h:482 [inline] ip_finish_output2+0x1354/0x1480 net/ipv4/ip_output.c:229 ip_finish_output+0xcbc/0x1000 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:277 [inline] ip_output+0x505/0x5d0 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:444 [inline] ip_local_out net/ipv4/ip_output.c:124 [inline] ip_queue_xmit+0x1b0f/0x1d00 net/ipv4/ip_output.c:504 tcp_transmit_skb+0x3db5/0x5350 net/ipv4/tcp_output.c:1176 __tcp_retransmit_skb+0x2fd6/0x4100 net/ipv4/tcp_output.c:2906 tcp_send_loss_probe+0xc79/0xf10 net/ipv4/tcp_output.c:2518 tcp_write_timer_handler+0x726/0xef0 net/ipv4/tcp_timer.c:569 tcp_write_timer+0x12b/0x280 net/ipv4/tcp_timer.c:593 call_timer_fn+0x280/0x5d0 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers+0xd96/0x11b0 kernel/time/timer.c:1666 run_timer_softirq+0x43/0x70 kernel/time/timer.c:1692 __do_softirq+0x592/0x979 kernel/softirq.c:285 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:282 [inline] kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:192 kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:318 kmsan_slab_alloc+0x10/0x20 mm/kmsan/kmsan.c:325 slab_post_alloc_hook mm/slab.h:446 [inline] slab_alloc_node mm/slub.c:2753 [inline] __kmalloc_node_track_caller+0xb35/0x11b0 mm/slub.c:4395 __kmalloc_reserve net/core/skbuff.c:138 [inline] __alloc_skb+0x2cb/0x9e0 net/core/skbuff.c:206 alloc_skb_fclone include/linux/skbuff.h:1030 [inline] sk_stream_alloc_skb+0x17c/0xcf0 net/ipv4/tcp.c:875 tcp_fragment+0x425/0x20e0 net/ipv4/tcp_output.c:1316 tcp_send_loss_probe+0xa73/0xf10 net/ipv4/tcp_output.c:2508 tcp_write_timer_handler+0x726/0xef0 net/ipv4/tcp_timer.c:569 tcp_write_timer+0x12b/0x280 net/ipv4/tcp_timer.c:593 call_timer_fn+0x280/0x5d0 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers+0xd96/0x11b0 kernel/time/timer.c:1666 run_timer_softirq+0x43/0x70 kernel/time/timer.c:1692 __do_softirq+0x592/0x979 kernel/softirq.c:285 ==================================================================