===================================================== BUG: KMSAN: uninit-value in geneve_xmit_skb drivers/net/geneve.c:909 [inline] BUG: KMSAN: uninit-value in geneve_xmit+0x300c/0x3200 drivers/net/geneve.c:1005 CPU: 1 PID: 9049 Comm: systemd-cgroups Not tainted 5.8.0-rc5-syzkaller #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+0x21c/0x280 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 geneve_xmit_skb drivers/net/geneve.c:909 [inline] geneve_xmit+0x300c/0x3200 drivers/net/geneve.c:1005 __netdev_start_xmit include/linux/netdevice.h:4611 [inline] netdev_start_xmit include/linux/netdevice.h:4625 [inline] xmit_one+0x3cf/0x750 net/core/dev.c:3556 dev_hard_start_xmit net/core/dev.c:3572 [inline] __dev_queue_xmit+0x3aad/0x4470 net/core/dev.c:4131 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4164 neigh_hh_output include/net/neighbour.h:498 [inline] neigh_output include/net/neighbour.h:507 [inline] ip6_finish_output2+0x23f1/0x2a70 net/ipv6/ip6_output.c:117 __ip6_finish_output+0x9c0/0xa90 net/ipv6/ip6_output.c:143 ip6_finish_output+0x14b/0x4b0 net/ipv6/ip6_output.c:153 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x68d/0x7f0 net/ipv6/ip6_output.c:176 dst_output include/net/dst.h:443 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] mld_sendpack+0xf6c/0x1470 net/ipv6/mcast.c:1679 mld_send_cr net/ipv6/mcast.c:1975 [inline] mld_ifc_timer_expire+0x13b8/0x1b50 net/ipv6/mcast.c:2474 call_timer_fn+0x226/0x550 kernel/time/timer.c:1404 expire_timers+0x4fc/0x780 kernel/time/timer.c:1449 __run_timers+0xaf4/0xd30 kernel/time/timer.c:1773 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786 __do_softirq+0x2ea/0x7f5 kernel/softirq.c:293 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711 __run_on_irqstack arch/x86/include/asm/irq_stack.h:23 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline] do_softirq_own_stack+0x7c/0xa0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:390 [inline] __irq_exit_rcu+0x226/0x270 kernel/softirq.c:420 irq_exit_rcu+0xe/0x10 kernel/softirq.c:432 sysvec_apic_timer_interrupt+0x107/0x130 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:593 RIP: 0010:kmsan_task_context_state+0x4/0x90 mm/kmsan/kmsan.c:66 Code: f2 15 00 00 e9 ab fd ff ff 49 89 d6 8b 7d d0 e8 92 13 00 00 41 89 06 e9 ae fd ff ff cc cc cc cc cc cc cc cc cc cc 55 48 89 e5 <53> 65 8b 05 2c 83 ca 7d 65 8b 0d dd f2 cb 7d 80 3d 96 a7 c8 10 00 RSP: 0000:ffff8880409c77b8 EFLAGS: 00000296 RAX: ffffffff821e515c RBX: ffff888040bc5f00 RCX: ffff888040bc5b80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffea00056bd5a0 RBP: ffff8880409c77b8 R08: ffffea000000000f R09: ffff88812fffa000 R10: 0000000000000002 R11: ffff888040bc5b80 R12: ffff888040bc6558 R13: ffffea00056bd5a0 R14: 0000000000000000 R15: 0000000000000000 __msan_get_context_state+0x9/0x20 mm/kmsan/kmsan_instr.c:225 lock_page_memcg+0x19/0x310 mm/memcontrol.c:1961 page_add_file_rmap+0x64/0xc10 mm/rmap.c:1206 alloc_set_pte+0x966/0x1e80 mm/memory.c:3677 filemap_map_pages+0x1c11/0x1f60 mm/filemap.c:2655 do_fault_around mm/memory.c:3820 [inline] do_read_fault+0x7fd/0x1950 mm/memory.c:3854 do_fault mm/memory.c:3987 [inline] handle_pte_fault mm/memory.c:4227 [inline] __handle_mm_fault mm/memory.c:4359 [inline] handle_mm_fault+0x3445/0x4940 mm/memory.c:4396 do_user_addr_fault+0xe09/0x19d0 arch/x86/mm/fault.c:1308 handle_page_fault arch/x86/mm/fault.c:1378 [inline] __exc_page_fault+0x308/0x450 arch/x86/mm/fault.c:1431 exc_page_fault+0x45/0x50 arch/x86/mm/fault.c:1390 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:550 RIP: 0033:0x7fc52545ad30 Code: Bad RIP value. RSP: 002b:00007ffea6d520a8 EFLAGS: 00010202 RAX: 00000000fbad8001 RBX: 000000000000001b RCX: 0000000000000000 RDX: 00007ffea6d521e8 RSI: 00007fc525b0c092 RDI: 00007ffea6d520b0 RBP: 00007ffea6d522c0 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000080000 R11: 0000000000000246 R12: 00007ffea6d520b0 R13: 00007fc525b0c092 R14: 00007ffea6d521e8 R15: 0000000000000001 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310 __msan_chain_origin+0x50/0x90 mm/kmsan/kmsan_instr.c:165 geneve_changelink+0xdb2/0x10f0 drivers/net/geneve.c:1652 __rtnl_newlink net/core/rtnetlink.c:3255 [inline] rtnl_newlink+0x3384/0x3ed0 net/core/rtnetlink.c:3397 rtnetlink_rcv_msg+0x142b/0x18c0 net/core/rtnetlink.c:5460 netlink_rcv_skb+0x6d7/0x7e0 net/netlink/af_netlink.c:2469 rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:5478 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x11c8/0x1490 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x173a/0x1840 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0xc82/0x1240 net/socket.c:2352 ___sys_sendmsg net/socket.c:2406 [inline] __sys_sendmsg+0x6d1/0x840 net/socket.c:2439 __do_sys_sendmsg net/socket.c:2448 [inline] __se_sys_sendmsg+0x97/0xb0 net/socket.c:2446 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2446 do_syscall_64+0xad/0x160 arch/x86/entry/common.c:386 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Local variable ----df@geneve_changelink created at: geneve_changelink+0x101/0x10f0 drivers/net/geneve.c:1622 geneve_changelink+0x101/0x10f0 drivers/net/geneve.c:1622 =====================================================