================================================================== BUG: KMSAN: uninit-value in slab_alloc_node mm/slub.c:2749 [inline] BUG: KMSAN: uninit-value in kmem_cache_alloc_node+0x5d0/0xe70 mm/slub.c:2828 CPU: 0 PID: 11073 Comm: syz-fuzzer Not tainted 5.3.0-rc7+ #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+0x191/0x1f0 lib/dump_stack.c:113 kmsan_report+0x162/0x2d0 mm/kmsan/kmsan_report.c:109 __msan_warning+0x75/0xe0 mm/kmsan/kmsan_instr.c:294 slab_alloc_node mm/slub.c:2749 [inline] kmem_cache_alloc_node+0x5d0/0xe70 mm/slub.c:2828 __alloc_skb+0x215/0xa10 net/core/skbuff.c:197 alloc_skb include/linux/skbuff.h:1056 [inline] ndisc_alloc_skb+0x1ba/0x5b0 net/ipv6/ndisc.c:416 ndisc_send_rs+0x488/0xb90 net/ipv6/ndisc.c:682 addrconf_rs_timer+0x847/0xc20 net/ipv6/addrconf.c:3879 call_timer_fn+0x232/0x530 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers+0xcdc/0x11a0 kernel/time/timer.c:1685 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1698 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 invoke_softirq kernel/softirq.c:375 [inline] irq_exit+0x230/0x280 kernel/softirq.c:416 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:537 smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:837 RIP: 0033:0x413453 Code: 04 10 48 01 f0 48 89 44 24 10 c3 48 89 f0 eb f5 cc cc cc cc cc cc cc 64 48 8b 0c 25 f8 ff ff ff 48 3b 61 10 0f 86 0d 06 00 00 <48> 83 ec 50 48 89 6c 24 48 48 8d 6c 24 48 48 8b 54 24 60 48 83 fa RSP: 002b:000000c43031af88 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 RAX: 000000c42f3e4e60 RBX: 00007fbef4b8f6c8 RCX: 000000c420156c00 RDX: 0000000000000020 RSI: 00000000008769c0 RDI: 000000c42f3e4e60 RBP: 000000c43031b028 R08: 0000000000000100 R09: 0000000000000006 R10: 0000000000c0de00 R11: 0000000000000004 R12: 0000000000000000 R13: 0000000000000020 R14: 0000000000000013 R15: 0000000000000028 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:189 [inline] kmsan_internal_chain_origin+0xcc/0x150 mm/kmsan/kmsan.c:347 __msan_chain_origin+0x6b/0xe0 mm/kmsan/kmsan_instr.c:190 ___slab_alloc+0x1dbc/0x1fb0 mm/slub.c:2634 __slab_alloc mm/slub.c:2687 [inline] slab_alloc_node mm/slub.c:2750 [inline] kmem_cache_alloc_node+0x769/0xe70 mm/slub.c:2828 __alloc_skb+0x215/0xa10 net/core/skbuff.c:197 __pskb_copy_fclone+0x178/0x1670 net/core/skbuff.c:1553 __pskb_copy include/linux/skbuff.h:1120 [inline] create_tagged_skb net/hsr/hsr_forward.c:158 [inline] frame_get_tagged_skb net/hsr/hsr_forward.c:194 [inline] hsr_forward_do net/hsr/hsr_forward.c:273 [inline] hsr_forward_skb+0x1a7d/0x3070 net/hsr/hsr_forward.c:361 hsr_dev_xmit+0xf8/0x160 net/hsr/hsr_device.c:231 __netdev_start_xmit include/linux/netdevice.h:4406 [inline] netdev_start_xmit include/linux/netdevice.h:4420 [inline] xmit_one net/core/dev.c:3280 [inline] dev_hard_start_xmit+0x51a/0xab0 net/core/dev.c:3296 __dev_queue_xmit+0x394d/0x4270 net/core/dev.c:3869 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3902 neigh_connected_output+0x66f/0x6f0 net/core/neighbour.c:1519 neigh_output include/net/neighbour.h:511 [inline] ip6_finish_output2+0x2129/0x2670 net/ipv6/ip6_output.c:116 __ip6_finish_output+0x83d/0x8f0 net/ipv6/ip6_output.c:142 ip6_finish_output+0x2db/0x420 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip6_output+0x5d3/0x720 net/ipv6/ip6_output.c:175 dst_output include/net/dst.h:436 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] ndisc_send_skb+0x1083/0x15e0 net/ipv6/ndisc.c:504 ndisc_send_rs+0xb5d/0xb90 net/ipv6/ndisc.c:698 addrconf_rs_timer+0x847/0xc20 net/ipv6/addrconf.c:3879 call_timer_fn+0x232/0x530 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers+0xcdc/0x11a0 kernel/time/timer.c:1685 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1698 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 invoke_softirq kernel/softirq.c:375 [inline] irq_exit+0x230/0x280 kernel/softirq.c:416 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:537 smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:837 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:189 [inline] kmsan_internal_poison_shadow+0x58/0xb0 mm/kmsan/kmsan.c:148 kmsan_slab_free+0x8d/0x100 mm/kmsan/kmsan_hooks.c:195 slab_free_freelist_hook mm/slub.c:1472 [inline] slab_free mm/slub.c:3038 [inline] kmem_cache_free_bulk+0x3ad9/0x3f50 mm/slub.c:3163 __kfree_skb_flush+0xb0/0x100 net/core/skbuff.c:862 net_rx_action+0x1908/0x1950 net/core/dev.c:6441 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 run_ksoftirqd+0x25/0x40 kernel/softirq.c:607 smpboot_thread_fn+0x4a3/0x990 kernel/smpboot.c:165 kthread+0x4b5/0x4f0 kernel/kthread.c:256 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355 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