===================================================== 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: 20054 Comm: syz-executor.2 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_resolve_output+0xbb0/0xc90 net/core/neighbour.c:1489 neigh_output include/net/neighbour.h:509 [inline] ip6_finish_output2+0x249c/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_unpoison_shadow+0x74/0x90 mm/kmsan/kmsan_hooks.c:401 Code: 89 df 4c 89 f6 31 d2 e8 2a e1 ff ff be ff ff ff ff 65 0f c1 35 dd 19 cc 7d ff ce 75 1a e8 a4 c5 14 ff 4c 89 7d e0 ff 75 e0 9d <48> 83 c4 10 5b 41 5e 41 5f 5d c3 0f 0b 48 c7 c7 f0 64 e1 91 31 c0 RSP: 0000:ffff88810ca476a8 EFLAGS: 00000246 RAX: ffff88802c004000 RBX: ffff88802c404000 RCX: 0000000000000401 RDX: 0000000000000400 RSI: 0000000000000000 RDI: ffff88802c404000 RBP: ffff88810ca476d0 R08: ffffea000000000f R09: ffff88812fffa000 R10: 0000000000000004 R11: ffff88810a79bd00 R12: 0000000000000001 R13: 0000000000000005 R14: 0000000000001000 R15: 0000000000000246 clear_page+0x34/0x40 arch/x86/include/asm/page_64.h:66 clear_highpage include/linux/highmem.h:285 [inline] kernel_init_free_pages mm/page_alloc.c:1170 [inline] prep_new_page+0x341/0xb40 mm/page_alloc.c:2233 get_page_from_freelist+0x1137/0x19b0 mm/page_alloc.c:3808 __alloc_pages_nodemask+0x8f4/0x1030 mm/page_alloc.c:4858 __alloc_pages include/linux/gfp.h:509 [inline] __alloc_pages_node include/linux/gfp.h:522 [inline] alloc_pages_vma+0x19c3/0x1ec0 mm/mempolicy.c:2236 do_huge_pmd_anonymous_page+0x1431/0x1ac0 mm/huge_memory.c:769 create_huge_pmd mm/memory.c:4109 [inline] __handle_mm_fault mm/memory.c:4330 [inline] handle_mm_fault+0x3d2c/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: 0023:0x8070ee6 Code: Bad RIP value. RSP: 002b:00000000ffa28b98 EFLAGS: 00010202 RAX: 0000000000000002 RBX: 0000000000000000 RCX: 0000000000000002 RDX: 0000000000000000 RSI: 0000000008ba00f8 RDI: 0000000020000080 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 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 __compat_sys_sendmsg net/compat.c:466 [inline] __do_compat_sys_sendmsg net/compat.c:473 [inline] __se_compat_sys_sendmsg+0xa7/0xc0 net/compat.c:470 __ia32_compat_sys_sendmsg+0x4a/0x70 net/compat.c:470 do_syscall_32_irqs_on arch/x86/entry/common.c:430 [inline] __do_fast_syscall_32+0x2af/0x480 arch/x86/entry/common.c:477 do_fast_syscall_32+0x6b/0xd0 arch/x86/entry/common.c:505 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:554 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c 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 =====================================================