vfs_write+0x467/0x8c0 fs/read_write.c:549 ksys_write fs/read_write.c:598 [inline] __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x1bf/0x3e0 fs/read_write.c:607 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x44/0xa9 ================================================================== BUG: KMSAN: uninit-value in prefetch_freepointer mm/slub.c:276 [inline] BUG: KMSAN: uninit-value in slab_alloc_node mm/slub.c:2746 [inline] BUG: KMSAN: uninit-value in __kmalloc_node_track_caller+0xe71/0x11b0 mm/slub.c:4395 CPU: 0 PID: 9945 Comm: syz-executor0 Not tainted 4.17.0+ #9 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+0x185/0x1d0 lib/dump_stack.c:113 kmsan_report+0x188/0x2a0 mm/kmsan/kmsan.c:1125 __msan_warning_32+0x70/0xc0 mm/kmsan/kmsan_instr.c:620 prefetch_freepointer mm/slub.c:276 [inline] slab_alloc_node mm/slub.c:2746 [inline] __kmalloc_node_track_caller+0xe71/0x11b0 mm/slub.c:4395 __kmalloc_reserve net/core/skbuff.c:138 [inline] __alloc_skb+0x2cb/0x9e0 net/core/skbuff.c:206 alloc_skb_fclone include/linux/skbuff.h:1030 [inline] sk_stream_alloc_skb+0x17c/0xcf0 net/ipv4/tcp.c:875 tcp_sendmsg_locked+0x237e/0x6610 net/ipv4/tcp.c:1290 tcp_sendmsg+0xb2/0x100 net/ipv4/tcp.c:1447 inet_sendmsg+0x3fc/0x760 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:629 [inline] sock_sendmsg net/socket.c:639 [inline] sock_write_iter+0x3bc/0x470 net/socket.c:908 call_write_iter include/linux/fs.h:1784 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x808/0x9f0 fs/read_write.c:487 vfs_write+0x467/0x8c0 fs/read_write.c:549 ksys_write fs/read_write.c:598 [inline] __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x1bf/0x3e0 fs/read_write.c:607 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x455a99 RSP: 002b:00007f2cfea99c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f2cfea9a6d4 RCX: 0000000000455a99 RDX: 0000000000000002 RSI: 0000000020000400 RDI: 0000000000000004 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c2607 R14: 00000000004d3cb0 R15: 0000000000000000 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:282 [inline] kmsan_save_stack mm/kmsan/kmsan.c:297 [inline] kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:689 kmsan_memcpy_origins+0x11d/0x170 mm/kmsan/kmsan.c:530 __msan_memcpy+0x109/0x160 mm/kmsan/kmsan_instr.c:413 pskb_expand_head+0x3a6/0x1a70 net/core/skbuff.c:1470 __skb_cow include/linux/skbuff.h:2899 [inline] skb_cow_head include/linux/skbuff.h:2933 [inline] ip_tunnel_xmit+0x3117/0x37c0 net/ipv4/ip_tunnel.c:771 ipip_tunnel_xmit+0x32b/0x4c0 net/ipv4/ipip.c:308 __netdev_start_xmit include/linux/netdevice.h:4087 [inline] netdev_start_xmit include/linux/netdevice.h:4096 [inline] xmit_one net/core/dev.c:3053 [inline] dev_hard_start_xmit+0x5f6/0xc80 net/core/dev.c:3069 __dev_queue_xmit+0x2ad2/0x3540 net/core/dev.c:3584 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3617 neigh_direct_output+0x42/0x50 net/core/neighbour.c:1398 neigh_output include/net/neighbour.h:482 [inline] ip_finish_output2+0x1354/0x1480 net/ipv4/ip_output.c:229 ip_finish_output+0xcbc/0x1000 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:277 [inline] ip_output+0x505/0x5d0 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:444 [inline] ip_local_out net/ipv4/ip_output.c:124 [inline] ip_queue_xmit+0x1b0f/0x1d00 net/ipv4/ip_output.c:504 tcp_transmit_skb+0x3db5/0x5350 net/ipv4/tcp_output.c:1176 __tcp_retransmit_skb+0x2fd6/0x4100 net/ipv4/tcp_output.c:2906 tcp_retransmit_skb+0xa6/0x480 net/ipv4/tcp_output.c:2925 tcp_retransmit_timer+0x21f9/0x4280 net/ipv4/tcp_timer.c:488 tcp_write_timer_handler+0x5c2/0xef0 net/ipv4/tcp_timer.c:573 tcp_write_timer+0x12b/0x280 net/ipv4/tcp_timer.c:593 call_timer_fn+0x280/0x5d0 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers+0xd96/0x11b0 kernel/time/timer.c:1666 run_timer_softirq+0x43/0x70 kernel/time/timer.c:1692 __do_softirq+0x592/0x979 kernel/softirq.c:285 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:282 [inline] kmsan_save_stack mm/kmsan/kmsan.c:297 [inline] kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:689 kmsan_memcpy_origins+0x11d/0x170 mm/kmsan/kmsan.c:530 __msan_memcpy+0x109/0x160 mm/kmsan/kmsan_instr.c:413 pskb_expand_head+0x3a6/0x1a70 net/core/skbuff.c:1470 skb_unclone include/linux/skbuff.h:1441 [inline] __tcp_retransmit_skb+0xfdb/0x4100 net/ipv4/tcp_output.c:2864 tcp_retransmit_skb+0xa6/0x480 net/ipv4/tcp_output.c:2925 tcp_retransmit_timer+0x21f9/0x4280 net/ipv4/tcp_timer.c:488 tcp_write_timer_handler+0x5c2/0xef0 net/ipv4/tcp_timer.c:573 tcp_write_timer+0x12b/0x280 net/ipv4/tcp_timer.c:593 call_timer_fn+0x280/0x5d0 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers+0xd96/0x11b0 kernel/time/timer.c:1666 run_timer_softirq+0x43/0x70 kernel/time/timer.c:1692 __do_softirq+0x592/0x979 kernel/softirq.c:285 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:282 [inline] kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:192 kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:318 kmsan_slab_alloc+0x10/0x20 mm/kmsan/kmsan.c:325 slab_post_alloc_hook mm/slab.h:446 [inline] slab_alloc_node mm/slub.c:2753 [inline] __kmalloc_node_track_caller+0xb35/0x11b0 mm/slub.c:4395 __kmalloc_reserve net/core/skbuff.c:138 [inline] __alloc_skb+0x2cb/0x9e0 net/core/skbuff.c:206 alloc_skb_fclone include/linux/skbuff.h:1030 [inline] sk_stream_alloc_skb+0x17c/0xcf0 net/ipv4/tcp.c:875 tcp_sendmsg_locked+0x237e/0x6610 net/ipv4/tcp.c:1290 tcp_sendmsg+0xb2/0x100 net/ipv4/tcp.c:1447 inet_sendmsg+0x3fc/0x760 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:629 [inline] sock_sendmsg net/socket.c:639 [inline] sock_write_iter+0x3bc/0x470 net/socket.c:908 call_write_iter include/linux/fs.h:1784 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x808/0x9f0 fs/read_write.c:487 vfs_write+0x467/0x8c0 fs/read_write.c:549 ksys_write fs/read_write.c:598 [inline] __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x1bf/0x3e0 fs/read_write.c:607 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x44/0xa9 ==================================================================