================================================================== BUG: KMSAN: uninit-value in __skb_checksum_complete+0x37f/0x550 net/core/skbuff.c:2683 CPU: 0 PID: 17462 Comm: blkid Not tainted 5.1.0-rc4+ #1 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+0x173/0x1d0 lib/dump_stack.c:113 kmsan_report+0x131/0x2a0 mm/kmsan/kmsan.c:619 __msan_warning+0x7a/0xf0 mm/kmsan/kmsan_instr.c:310 __skb_checksum_complete+0x37f/0x550 net/core/skbuff.c:2683 nf_ip_checksum+0x56b/0x710 net/netfilter/utils.c:35 nf_nat_icmp_reply_translation+0x287/0x9a0 net/netfilter/nf_nat_proto.c:570 nf_nat_ipv4_fn net/netfilter/nf_nat_proto.c:629 [inline] nf_nat_ipv4_local_fn+0x215/0x840 net/netfilter/nf_nat_proto.c:700 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline] nf_hook_slow+0x176/0x3d0 net/netfilter/core.c:511 nf_hook include/linux/netfilter.h:244 [inline] __ip_local_out+0x6dc/0x800 net/ipv4/ip_output.c:113 ip_local_out net/ipv4/ip_output.c:122 [inline] ip_send_skb net/ipv4/ip_output.c:1465 [inline] ip_push_pending_frames+0x16f/0x460 net/ipv4/ip_output.c:1485 icmp_push_reply+0x719/0x7e0 net/ipv4/icmp.c:394 __icmp_send+0x2ec5/0x3110 net/ipv4/icmp.c:737 icmp_send include/net/icmp.h:47 [inline] ipv4_link_failure+0x6d/0x230 net/ipv4/route.c:1190 dst_link_failure include/net/dst.h:427 [inline] arp_error_report+0x106/0x1a0 net/ipv4/arp.c:297 neigh_invalidate+0x359/0x8e0 net/core/neighbour.c:995 neigh_timer_handler+0xdb4/0x1490 net/core/neighbour.c:1081 call_timer_fn+0x285/0x600 kernel/time/timer.c:1325 expire_timers kernel/time/timer.c:1362 [inline] __run_timers+0xdb4/0x11d0 kernel/time/timer.c:1681 run_timer_softirq+0x2e/0x50 kernel/time/timer.c:1694 __do_softirq+0x53f/0x93a kernel/softirq.c:294 invoke_softirq kernel/softirq.c:376 [inline] irq_exit+0x241/0x290 kernel/softirq.c:417 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:536 smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1064 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:814 RIP: 0010:virt_to_page_or_null mm/kmsan/kmsan.c:557 [inline] RIP: 0010:kmsan_get_shadow_origin_ptr+0x2e9/0x480 mm/kmsan/kmsan.c:870 Code: 89 f1 48 c1 e9 22 48 8b 04 c8 48 85 c0 0f 84 7c fd ff ff 48 c1 ee 1b 83 e6 7f 48 c1 e6 05 48 01 f0 0f 84 68 fd ff ff f6 00 02 <0f> 84 5f fd ff ff 48 b8 ff ff ff 7f ff ff ff ff 49 39 c6 76 22 48 RSP: 0000:ffff8881c1b6f6c0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: ffff88812fffb020 RBX: ffffffff8c89c000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000020 RDI: ffffffff8b9fe945 RBP: ffff8881c1b6f6f8 R08: 000000000c2e27ec R09: 0000778000000001 R10: ffffd0ffffffffff R11: 0000100000000000 R12: ffff88812fffc000 R13: ffffffff8c2e27ec R14: ffffffff8c2e27ec R15: 0000000000000004 __msan_metadata_ptr_for_load_4+0x10/0x20 mm/kmsan/kmsan_instr.c:54 get_page_from_freelist+0x7ca/0x19e0 mm/page_alloc.c:3508 __alloc_pages_nodemask+0x705/0x5e90 mm/page_alloc.c:4613 alloc_pages_vma+0xd26/0x1970 mm/mempolicy.c:2096 do_cow_fault mm/memory.c:3471 [inline] do_fault mm/memory.c:3583 [inline] handle_pte_fault mm/memory.c:3812 [inline] __handle_mm_fault mm/memory.c:3936 [inline] handle_mm_fault+0x4591/0xa4d0 mm/memory.c:3973 do_user_addr_fault arch/x86/mm/fault.c:1495 [inline] __do_page_fault+0xdfd/0x1800 arch/x86/mm/fault.c:1561 do_page_fault+0xe9/0x5c0 arch/x86/mm/fault.c:1592 page_fault+0x3d/0x50 arch/x86/entry/entry_64.S:1156 RIP: 0033:0x7fd70e934556 Code: 8d 1d 98 00 00 00 48 8d 0d 87 23 00 00 4a 0f bf 0c 51 4e 8d 1c 19 41 ff e3 66 66 2e 0f 1f 84 00 00 00 00 00 88 57 f3 89 57 f4 <48> 89 57 f8 eb 6e 0f 1f 40 00 88 57 f7 48 89 57 f8 eb 61 0f 1f 80 RSP: 002b:00007ffd7ba28108 EFLAGS: 00010202 RAX: 00007fd70e6f0db8 RBX: 00007fd70eb3b9a8 RCX: ffffffffffffff8c RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007fd70e6f0dc0 RBP: 00007ffd7ba28460 R08: 0000000000000240 R09: 0000000000000008 R10: 0000000000000008 R11: 00007fd70e934556 R12: 00007ffd7ba28548 R13: 0000000000000002 R14: 00007ffd7ba28180 R15: 00007ffd7ba28150 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline] kmsan_save_stack mm/kmsan/kmsan.c:220 [inline] kmsan_internal_chain_origin+0x134/0x230 mm/kmsan/kmsan.c:426 kmsan_memcpy_memmove_metadata+0x989/0xd60 mm/kmsan/kmsan.c:304 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:324 __msan_memcpy+0x58/0x70 mm/kmsan/kmsan_instr.c:139 csum_partial_copy+0xbd/0x520 lib/checksum.c:178 skb_copy_and_csum_bits+0x214/0x10a0 net/core/skbuff.c:2570 icmp_glue_bits+0x16b/0x380 net/ipv4/icmp.c:357 __ip_append_data+0x3f20/0x5000 net/ipv4/ip_output.c:1040 ip_append_data+0x324/0x480 net/ipv4/ip_output.c:1220 icmp_push_reply+0x23d/0x7e0 net/ipv4/icmp.c:375 __icmp_send+0x2ec5/0x3110 net/ipv4/icmp.c:737 icmp_send include/net/icmp.h:47 [inline] ipv4_link_failure+0x6d/0x230 net/ipv4/route.c:1190 dst_link_failure include/net/dst.h:427 [inline] arp_error_report+0x106/0x1a0 net/ipv4/arp.c:297 neigh_invalidate+0x359/0x8e0 net/core/neighbour.c:995 neigh_timer_handler+0xdb4/0x1490 net/core/neighbour.c:1081 call_timer_fn+0x285/0x600 kernel/time/timer.c:1325 expire_timers kernel/time/timer.c:1362 [inline] __run_timers+0xdb4/0x11d0 kernel/time/timer.c:1681 run_timer_softirq+0x2e/0x50 kernel/time/timer.c:1694 __do_softirq+0x53f/0x93a kernel/softirq.c:294 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline] kmsan_save_stack mm/kmsan/kmsan.c:220 [inline] kmsan_internal_chain_origin+0x134/0x230 mm/kmsan/kmsan.c:426 kmsan_memcpy_memmove_metadata+0x989/0xd60 mm/kmsan/kmsan.c:304 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:324 __msan_memcpy+0x58/0x70 mm/kmsan/kmsan_instr.c:139 pskb_expand_head+0x3aa/0x1a30 net/core/skbuff.c:1478 skb_realloc_headroom+0x191/0x2d0 net/core/skbuff.c:1551 ip_finish_output2+0xd78/0x1930 net/ipv4/ip_output.c:202 ip_finish_output+0xd2b/0xfd0 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip_output+0x53f/0x610 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+0x1c1a/0x2140 net/ipv4/ip_output.c:505 ip_queue_xmit include/net/ip.h:198 [inline] l2tp_xmit_core net/l2tp/l2tp_core.c:1036 [inline] l2tp_xmit_skb+0x16d9/0x1cd0 net/l2tp/l2tp_core.c:1135 pppol2tp_sendmsg+0x760/0xae0 net/l2tp/l2tp_ppp.c:329 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:661 [inline] ___sys_sendmsg+0xdb3/0x1220 net/socket.c:2260 __sys_sendmmsg+0x580/0xad0 net/socket.c:2355 __do_sys_sendmmsg net/socket.c:2384 [inline] __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2381 __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2381 do_syscall_64+0xbc/0xf0 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:205 [inline] kmsan_save_stack mm/kmsan/kmsan.c:220 [inline] kmsan_internal_chain_origin+0x134/0x230 mm/kmsan/kmsan.c:426 kmsan_memcpy_memmove_metadata+0x989/0xd60 mm/kmsan/kmsan.c:304 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:324 __msan_memcpy+0x58/0x70 mm/kmsan/kmsan_instr.c:139 pskb_expand_head+0x3aa/0x1a30 net/core/skbuff.c:1478 __skb_cow include/linux/skbuff.h:3029 [inline] skb_cow_head include/linux/skbuff.h:3063 [inline] l2tp_xmit_skb+0x432/0x1cd0 net/l2tp/l2tp_core.c:1072 pppol2tp_sendmsg+0x760/0xae0 net/l2tp/l2tp_ppp.c:329 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:661 [inline] ___sys_sendmsg+0xdb3/0x1220 net/socket.c:2260 __sys_sendmmsg+0x580/0xad0 net/socket.c:2355 __do_sys_sendmmsg net/socket.c:2384 [inline] __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2381 __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2381 do_syscall_64+0xbc/0xf0 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:205 [inline] kmsan_internal_poison_shadow+0x92/0x150 mm/kmsan/kmsan.c:159 kmsan_kmalloc+0xa9/0x130 mm/kmsan/kmsan_hooks.c:174 kmsan_slab_alloc+0xe/0x10 mm/kmsan/kmsan_hooks.c:183 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc_node mm/slub.c:2771 [inline] __kmalloc_node_track_caller+0xead/0x1000 mm/slub.c:4399 __kmalloc_reserve net/core/skbuff.c:140 [inline] __alloc_skb+0x309/0xa20 net/core/skbuff.c:208 alloc_skb include/linux/skbuff.h:1059 [inline] sock_wmalloc+0x13e/0x650 net/core/sock.c:2072 pppol2tp_sendmsg+0x33b/0xae0 net/l2tp/l2tp_ppp.c:302 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:661 [inline] ___sys_sendmsg+0xdb3/0x1220 net/socket.c:2260 __sys_sendmmsg+0x580/0xad0 net/socket.c:2355 __do_sys_sendmmsg net/socket.c:2384 [inline] __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2381 __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2381 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 ==================================================================