netlink: 42 bytes leftover after parsing attributes in process `syz-executor2'. ================================================================== BUG: KMSAN: uninit-value in _decode_session6+0x635/0x1630 net/ipv6/xfrm6_policy.c:149 CPU: 1 PID: 8442 Comm: syz-executor5 Not tainted 4.19.0-rc8+ #70 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+0x306/0x460 lib/dump_stack.c:113 kmsan_report+0x1a2/0x2e0 mm/kmsan/kmsan.c:917 __msan_warning+0x7c/0xe0 mm/kmsan/kmsan_instr.c:500 _decode_session6+0x635/0x1630 net/ipv6/xfrm6_policy.c:149 __xfrm_decode_session+0x156/0x200 net/xfrm/xfrm_policy.c:2299 xfrm_decode_session_reverse include/net/xfrm.h:1239 [inline] icmpv6_route_lookup net/ipv6/icmp.c:372 [inline] icmp6_send+0x3037/0x3c50 net/ipv6/icmp.c:551 icmpv6_send+0xe5/0x110 net/ipv6/ip6_icmp.c:43 ip6_link_failure+0x5c/0x310 net/ipv6/route.c:2260 dst_link_failure include/net/dst.h:427 [inline] ndisc_error_report+0x106/0x1a0 net/ipv6/ndisc.c:695 neigh_invalidate+0x35a/0x900 net/core/neighbour.c:894 neigh_timer_handler+0xca1/0x12a0 net/core/neighbour.c:980 call_timer_fn+0x326/0x700 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers+0xe75/0x12e0 kernel/time/timer.c:1682 run_timer_softirq+0x2e/0x50 kernel/time/timer.c:1695 __do_softirq+0x601/0xa6d kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x247/0x280 kernel/softirq.c:414 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:536 smp_apic_timer_interrupt+0x64/0x90 arch/x86/kernel/apic/apic.c:1059 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:869 RIP: 0010:memset_erms+0xb/0x10 arch/x86/lib/memset_64.S:66 Code: 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 f3 aa <4c> 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 01 01 RSP: 0018:ffff88012bfbf798 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: ffff88017f60f8ff RBX: 0000000000000008 RCX: 0000000000000000 RDX: 0000000000000008 RSI: 00000000ffffffff RDI: ffff88017f60f8c0 RBP: ffff88012bfbf840 R08: ffffffff7fffffff R09: ffff88017f60f8b8 R10: 00000000801e001c R11: ffffffff85c21ac0 R12: 0000000000000008 R13: ffff88012bfbf8b8 R14: ffff880183dd1e00 R15: 0000000000000008 __kernfs_remove+0xb6/0x15e0 fs/kernfs/dir.c:1278 kernfs_remove_by_name_ns+0x115/0x1f0 fs/kernfs/dir.c:1512 kernfs_remove_by_name include/linux/kernfs.h:538 [inline] remove_files fs/sysfs/group.c:27 [inline] sysfs_remove_group+0x34f/0x5f0 fs/sysfs/group.c:263 sysfs_remove_groups+0xe1/0x190 fs/sysfs/group.c:287 device_remove_groups drivers/base/core.c:1117 [inline] device_remove_attrs drivers/base/core.c:1305 [inline] device_del+0xd7b/0x2060 drivers/base/core.c:2076 device team0 entered promiscuous mode device_unregister+0x37/0x90 drivers/base/core.c:2113 device team_slave_0 entered promiscuous mode bdi_unregister+0x8af/0xa80 mm/backing-dev.c:948 del_gendisk+0xa3b/0x10b0 block/genhd.c:764 loop_remove drivers/block/loop.c:1927 [inline] loop_control_ioctl+0x964/0xaa0 drivers/block/loop.c:2028 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0xf28/0x2ca0 fs/ioctl.c:687 device team_slave_1 entered promiscuous mode ksys_ioctl fs/ioctl.c:702 [inline] __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl+0x1da/0x270 fs/ioctl.c:707 __x64_sys_ioctl+0x4a/0x70 fs/ioctl.c:707 do_syscall_64+0xbe/0x100 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x457569 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4667c9cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569 RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000004 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4667c9d6d4 R13: 00000000004c03ca R14: 00000000004d0570 R15: 00000000ffffffff Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:255 [inline] kmsan_internal_poison_shadow+0xc8/0x1d0 mm/kmsan/kmsan.c:180 kmsan_kmalloc+0xa4/0x120 mm/kmsan/kmsan_hooks.c:104 kmsan_slab_alloc+0x10/0x20 mm/kmsan/kmsan_hooks.c:113 slab_post_alloc_hook mm/slab.h:446 [inline] slab_alloc_node mm/slub.c:2727 [inline] __kmalloc_node_track_caller+0xb43/0x1400 mm/slub.c:4360 __kmalloc_reserve net/core/skbuff.c:138 [inline] __alloc_skb+0x422/0xe90 net/core/skbuff.c:206 alloc_skb include/linux/skbuff.h:996 [inline] __ip6_append_data+0x3bf8/0x5170 net/ipv6/ip6_output.c:1425 ip6_append_data+0x3d8/0x670 net/ipv6/ip6_output.c:1587 rawv6_sendmsg+0x26c2/0x54d0 net/ipv6/raw.c:937 inet_sendmsg+0x4d8/0x7f0 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg net/socket.c:631 [inline] ___sys_sendmsg+0xe47/0x1200 net/socket.c:2116 __sys_sendmsg net/socket.c:2154 [inline] __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg+0x307/0x460 net/socket.c:2161 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2161 do_syscall_64+0xbe/0x100 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 ==================================================================