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BUG: KMSAN: uninit-value in slab_alloc_node mm/slub.c:2705 [inline]
BUG: KMSAN: uninit-value in __kmalloc_node+0xb2d/0x1220 mm/slub.c:3823
CPU: 1 PID: 16075 Comm: syz-executor7 Not tainted 4.18.0-rc8+ #34
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+0x17c/0x1c0 lib/dump_stack.c:113
 kmsan_report+0x188/0x2a0 mm/kmsan/kmsan.c:982
 __msan_warning+0x70/0xc0 mm/kmsan/kmsan_instr.c:645
 slab_alloc_node mm/slub.c:2705 [inline]
 __kmalloc_node+0xb2d/0x1220 mm/slub.c:3823
 kmalloc_node include/linux/slab.h:555 [inline]
 kvmalloc_node+0x19d/0x370 mm/util.c:423
 kvmalloc include/linux/mm.h:576 [inline]
 kvzalloc include/linux/mm.h:584 [inline]
 bucket_table_alloc+0xdb/0xb20 lib/rhashtable.c:181
 rhashtable_init+0x9d2/0xc30 lib/rhashtable.c:1076
 tcf_action_net_init+0xa4/0xd0 net/sched/act_api.c:1523
 ops_init+0x59f/0x730 net/core/net_namespace.c:128
 setup_net+0x263/0xf30 net/core/net_namespace.c:313
 copy_net_ns+0x585/0x860 net/core/net_namespace.c:436
 create_new_namespaces+0x891/0xdd0 kernel/nsproxy.c:107
 copy_namespaces+0x2af/0x370 kernel/nsproxy.c:165
 copy_process+0x3d13/0xa0e0 kernel/fork.c:1830
 _do_fork+0x339/0xfb0 kernel/fork.c:2123
 __do_sys_clone kernel/fork.c:2230 [inline]
 __se_sys_clone kernel/fork.c:2224 [inline]
 __x64_sys_clone+0x15e/0x1b0 kernel/fork.c:2224
 do_syscall_64+0x15b/0x220 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x457089
Code: fd b4 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 b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f46c93c5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f46c93c66d4 RCX: 0000000000457089
RDX: 0000000020000080 RSI: 0000000020000180 RDI: 0000000070024000
RBP: 00000000009300a0 R08: 0000000020000240 R09: 0000000000000000
R10: 0000000020000440 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004cb448 R14: 00000000004c3092 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline]
 kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:181
 kmsan_kmalloc+0x98/0x100 mm/kmsan/kmsan_hooks.c:91
 kmsan_slab_alloc+0x10/0x20 mm/kmsan/kmsan_hooks.c:100
 slab_post_alloc_hook mm/slab.h:446 [inline]
 slab_alloc_node mm/slub.c:2720 [inline]
 __kmalloc_node_track_caller+0xb4c/0x11d0 mm/slub.c:4353
 __kmalloc_reserve net/core/skbuff.c:138 [inline]
 __alloc_skb+0x2ce/0x9b0 net/core/skbuff.c:206
 alloc_skb_fclone include/linux/skbuff.h:1030 [inline]
 sk_stream_alloc_skb+0x172/0xc90 net/ipv4/tcp.c:875
 tso_fragment net/ipv4/tcp_output.c:1873 [inline]
 tcp_write_xmit+0x2637/0xa4e0 net/ipv4/tcp_output.c:2367
 tcp_tsq_write+0x3ec/0x440 net/ipv4/tcp_output.c:801
 tcp_tsq_handler net/ipv4/tcp_output.c:810 [inline]
 tcp_pace_kick+0x115/0x270 net/ipv4/tcp_output.c:974
 __run_hrtimer kernel/time/hrtimer.c:1398 [inline]
 __hrtimer_run_queues+0xbfc/0x15b0 kernel/time/hrtimer.c:1460
 hrtimer_run_softirq+0x1b3/0x2b0 kernel/time/hrtimer.c:1474
 __do_softirq+0x582/0x969 kernel/softirq.c:292
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