===================================================== BUG: KMSAN: uninit-value in batadv_bla_tx+0x2675/0x3730 net/batman-adv/bridge_loop_avoidance.c:1960 CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.6.0-rc7-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+0x1c9/0x220 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 batadv_bla_tx+0x2675/0x3730 net/batman-adv/bridge_loop_avoidance.c:1960 batadv_interface_tx+0x67c/0x2450 net/batman-adv/soft-interface.c:239 __netdev_start_xmit include/linux/netdevice.h:4523 [inline] netdev_start_xmit include/linux/netdevice.h:4537 [inline] xmit_one net/core/dev.c:3477 [inline] dev_hard_start_xmit+0x531/0xab0 net/core/dev.c:3493 __dev_queue_xmit+0x2f8d/0x3b20 net/core/dev.c:4052 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4085 hsr_xmit net/hsr/hsr_forward.c:228 [inline] hsr_forward_do net/hsr/hsr_forward.c:285 [inline] hsr_forward_skb+0x2614/0x30d0 net/hsr/hsr_forward.c:361 hsr_handle_frame+0x3bc/0x4e0 net/hsr/hsr_slave.c:45 __netif_receive_skb_core+0x21de/0x5840 net/core/dev.c:5088 __netif_receive_skb_one_core net/core/dev.c:5185 [inline] __netif_receive_skb net/core/dev.c:5301 [inline] process_backlog+0x936/0x1410 net/core/dev.c:6133 napi_poll net/core/dev.c:6571 [inline] net_rx_action+0x786/0x1aa0 net/core/dev.c:6639 __do_softirq+0x311/0x83d kernel/softirq.c:293 run_ksoftirqd+0x25/0x40 kernel/softirq.c:607 smpboot_thread_fn+0x493/0x980 kernel/smpboot.c:165 kthread+0x4b5/0x4f0 kernel/kthread.c:256 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:353 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 kmsan_memcpy_memmove_metadata+0x272/0x2e0 mm/kmsan/kmsan.c:247 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267 __msan_memcpy+0x43/0x50 mm/kmsan/kmsan_instr.c:116 pskb_expand_head+0x38b/0x1b00 net/core/skbuff.c:1636 __skb_pad+0x47f/0x900 net/core/skbuff.c:1804 __skb_put_padto include/linux/skbuff.h:3242 [inline] skb_put_padto include/linux/skbuff.h:3261 [inline] send_hsr_supervision_frame+0x122d/0x1500 net/hsr/hsr_device.c:310 hsr_announce+0x1e2/0x370 net/hsr/hsr_device.c:341 call_timer_fn+0x218/0x510 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers+0xcff/0x1210 kernel/time/timer.c:1773 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786 __do_softirq+0x311/0x83d kernel/softirq.c:293 Uninit was created at: kmsan_save_stack_with_flags+0x3c/0x90 mm/kmsan/kmsan.c:144 kmsan_internal_alloc_meta_for_pages mm/kmsan/kmsan_shadow.c:307 [inline] kmsan_alloc_page+0x12a/0x310 mm/kmsan/kmsan_shadow.c:336 __alloc_pages_nodemask+0x5712/0x5e80 mm/page_alloc.c:4775 __alloc_pages include/linux/gfp.h:498 [inline] __alloc_pages_node include/linux/gfp.h:511 [inline] alloc_pages_node include/linux/gfp.h:525 [inline] __page_frag_cache_refill mm/page_alloc.c:4850 [inline] page_frag_alloc+0x3ae/0x910 mm/page_alloc.c:4880 __napi_alloc_skb+0x193/0xa60 net/core/skbuff.c:519 napi_alloc_skb include/linux/skbuff.h:2874 [inline] page_to_skb+0x19f/0x1100 drivers/net/virtio_net.c:384 receive_mergeable drivers/net/virtio_net.c:924 [inline] receive_buf+0xe79/0x8b30 drivers/net/virtio_net.c:1033 virtnet_receive drivers/net/virtio_net.c:1323 [inline] virtnet_poll+0x64b/0x19f0 drivers/net/virtio_net.c:1428 napi_poll net/core/dev.c:6571 [inline] net_rx_action+0x786/0x1aa0 net/core/dev.c:6639 __do_softirq+0x311/0x83d kernel/softirq.c:293 =====================================================