syzbot

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BUG: KMSAN: use-after-free in __skb_unlink include/linux/skbuff.h:2010 [inline]
BUG: KMSAN: use-after-free in __skb_dequeue include/linux/skbuff.h:2025 [inline]
BUG: KMSAN: use-after-free in neigh_invalidate+0x45e/0x8e0 net/core/neighbour.c:994
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc5+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x191/0x1f0 lib/dump_stack.c:113
 kmsan_report+0x128/0x220 mm/kmsan/kmsan_report.c:108
 __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:245
 __skb_unlink include/linux/skbuff.h:2010 [inline]
 __skb_dequeue include/linux/skbuff.h:2025 [inline]
 neigh_invalidate+0x45e/0x8e0 net/core/neighbour.c:994
 neigh_timer_handler+0xda4/0x1450 net/core/neighbour.c:1082
 call_timer_fn+0x232/0x530 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers+0xd60/0x1270 kernel/time/timer.c:1773
 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786
 __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:536
 smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1139
 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:837
 </IRQ>
RIP: 0010:default_idle+0x53/0x90 arch/x86/kernel/process.c:581
Code: f3 14 ec f2 44 8b 35 44 74 cf 01 48 c7 c7 88 e5 23 90 e8 b0 95 b2 f3 83 38 00 75 31 45 85 f6 7e 07 0f 00 2d e7 ed 4c 00 fb f4 <65> 8b 35 ce 41 ae 71 c7 03 00 00 00 00 c7 43 08 00 00 00 00 bf ff
RSP: 0018:ffffffff8f60fda0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffff888217c37588 RBX: ffffffff8f638b68 RCX: ccccccccccccd000
RDX: ffff888207e30588 RSI: ffffea000a76d130 RDI: 000000001023e588
RBP: ffffffff8f60fdb0 R08: 0000000000000000 R09: ffff88821f4a21c2
R10: 0000000000000004 R11: ffffffff8e547110 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff8f638b68
 arch_cpu_idle+0x25/0x30 arch/x86/kernel/process.c:571
 default_idle_call kernel/sched/idle.c:94 [inline]
 cpuidle_idle_call kernel/sched/idle.c:154 [inline]
 do_idle+0x1d5/0x780 kernel/sched/idle.c:263
 cpu_startup_entry+0x45/0x50 kernel/sched/idle.c:355
 rest_init+0x1be/0x1f0 init/main.c:452
 arch_call_rest_init+0x13/0x15
 start_kernel+0x987/0xb57 init/main.c:787
 x86_64_start_reservations+0x18/0x2e arch/x86/kernel/head64.c:490
 x86_64_start_kernel+0x81/0x84 arch/x86/kernel/head64.c:471
 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:151 [inline]
 kmsan_internal_poison_shadow+0x60/0x120 mm/kmsan/kmsan.c:134
 kmsan_slab_free+0x8d/0xf0 mm/kmsan/kmsan_hooks.c:108
 slab_free_freelist_hook mm/slub.c:1473 [inline]
 slab_free mm/slub.c:3046 [inline]
 kmem_cache_free+0x2d1/0x2b70 mm/slub.c:3062
 kfree_skbmem net/core/skbuff.c:644 [inline]
 __kfree_skb net/core/skbuff.c:680 [inline]
 kfree_skb+0x473/0x4c0 net/core/skbuff.c:697
 kfree_skb_list+0x9d/0xe0 net/core/skbuff.c:706
 __dev_xmit_skb net/core/dev.c:3543 [inline]
 __dev_queue_xmit+0x396f/0x4200 net/core/dev.c:3842
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3906
 tx+0xe2/0x2f0 drivers/block/aoe/aoenet.c:63
 kthread+0x1f6/0x470 drivers/block/aoe/aoecmd.c:1239
 kthread+0x4b5/0x4f0 kernel/kthread.c:256
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355
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