=============================== [ INFO: suspicious RCU usage. ] 4.9.205-syzkaller #0 Not tainted ------------------------------- include/linux/inetdevice.h:205 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 0 4 locks held by syz-executor.2/13836: #0: (rcu_read_lock_bh){......}, at: [<000000004579aab7>] ip_finish_output2+0x20b/0x1280 net/ipv4/ip_output.c:198 #1: (rcu_read_lock_bh){......}, at: [<000000005a239c51>] __dev_queue_xmit+0x1d4/0x1bd0 net/core/dev.c:3407 #2: (_xmit_TUNNEL6#2){+.-...}, at: [<0000000077051fa7>] spin_lock include/linux/spinlock.h:302 [inline] #2: (_xmit_TUNNEL6#2){+.-...}, at: [<0000000077051fa7>] __netif_tx_lock include/linux/netdevice.h:3573 [inline] #2: (_xmit_TUNNEL6#2){+.-...}, at: [<0000000077051fa7>] __dev_queue_xmit+0x1116/0x1bd0 net/core/dev.c:3469 #3: (slock-AF_INET){+.-...}, at: [<00000000e4e092ce>] spin_trylock include/linux/spinlock.h:312 [inline] #3: (slock-AF_INET){+.-...}, at: [<00000000e4e092ce>] icmp_xmit_lock net/ipv4/icmp.c:220 [inline] #3: (slock-AF_INET){+.-...}, at: [<00000000e4e092ce>] __icmp_send+0x48b/0x1420 net/ipv4/icmp.c:656 stack backtrace: CPU: 1 PID: 13836 Comm: syz-executor.2 Not tainted 4.9.205-syzkaller #0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=15 sclass=netlink_route_socket pig=13843 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=13843 comm=syz-executor.1 ffff8801d8696dd8 ffffffff81b55e6b ffff8801c9733780 0000000000000000 0000000000000002 00000000000000cd ffff8801a0285f00 ffff8801d8696e08 ffffffff81406997 ffff8801c97337d8 ffff8801d8696f28 ffff8801ce5fa200 Call Trace: [<000000006db1fc52>] __dump_stack lib/dump_stack.c:15 [inline] [<000000006db1fc52>] dump_stack+0xcb/0x130 lib/dump_stack.c:56 ip6_tunnel: ip6tnl1 xmit: Local address not yet configured! [<0000000050424a08>] lockdep_rcu_suspicious.cold+0x10a/0x149 kernel/locking/lockdep.c:4458 [<0000000017005fd3>] __in_dev_get_rcu include/linux/inetdevice.h:205 [inline] [<0000000017005fd3>] fib_compute_spec_dst+0x6c4/0xcc0 net/ipv4/fib_frontend.c:284 [<000000005e739fb2>] __ip_options_echo+0x4be/0x13e0 net/ipv4/ip_options.c:177 [<0000000003007df6>] __icmp_send+0x648/0x1420 net/ipv4/icmp.c:685 [<00000000bb676941>] ipv4_send_dest_unreach net/ipv4/route.c:1203 [inline] [<00000000bb676941>] ipv4_link_failure+0x460/0x850 net/ipv4/route.c:1210 [<00000000715fbd1a>] dst_link_failure include/net/dst.h:490 [inline] [<00000000715fbd1a>] vti6_xmit net/ipv6/ip6_vti.c:522 [inline] [<00000000715fbd1a>] vti6_tnl_xmit+0xb08/0x17f0 net/ipv6/ip6_vti.c:561 [<00000000061d2196>] __netdev_start_xmit include/linux/netdevice.h:4072 [inline] [<00000000061d2196>] netdev_start_xmit include/linux/netdevice.h:4081 [inline] [<00000000061d2196>] xmit_one net/core/dev.c:2977 [inline] [<00000000061d2196>] dev_hard_start_xmit+0x195/0x8b0 net/core/dev.c:2993 [<00000000264a29b3>] __dev_queue_xmit+0x11a3/0x1bd0 net/core/dev.c:3473 [<000000005d3ab252>] dev_queue_xmit+0x18/0x20 net/core/dev.c:3506 [<00000000b5fd6390>] neigh_direct_output+0x16/0x20 net/core/neighbour.c:1368 [<00000000018eb2a5>] dst_neigh_output include/net/dst.h:470 [inline] [<00000000018eb2a5>] ip_finish_output2+0x6a2/0x1280 net/ipv4/ip_output.c:225 ip6_tunnel: ´ xmit: Local address not yet configured! [<00000000bf7c55c9>] ip_finish_output+0x3c4/0xce0 net/ipv4/ip_output.c:313 [<000000003b6c3a20>] NF_HOOK_COND include/linux/netfilter.h:246 [inline] [<000000003b6c3a20>] ip_output+0x1ec/0x5b0 net/ipv4/ip_output.c:401 [<0000000088516e51>] dst_output include/net/dst.h:507 [inline] [<0000000088516e51>] NF_HOOK_THRESH include/linux/netfilter.h:232 [inline] [<0000000088516e51>] NF_HOOK include/linux/netfilter.h:255 [inline] [<0000000088516e51>] raw_send_hdrinc net/ipv4/raw.c:421 [inline] [<0000000088516e51>] raw_sendmsg+0x1c5c/0x23e0 net/ipv4/raw.c:643 [<000000003f1b0228>] inet_sendmsg+0x202/0x4d0 net/ipv4/af_inet.c:766 [<00000000ee7c9a64>] sock_sendmsg_nosec net/socket.c:649 [inline] [<00000000ee7c9a64>] sock_sendmsg+0xbe/0x110 net/socket.c:659 [<000000009f80c1c6>] sock_write_iter+0x235/0x3d0 net/socket.c:857 [<000000009d2f4779>] new_sync_write fs/read_write.c:498 [inline] [<000000009d2f4779>] __vfs_write+0x3c1/0x560 fs/read_write.c:511 [<00000000a390c0d3>] vfs_write+0x185/0x520 fs/read_write.c:559 [<0000000073ff1807>] SYSC_write fs/read_write.c:607 [inline] [<0000000073ff1807>] SyS_write+0x121/0x270 fs/read_write.c:599 [<00000000ffa8e071>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<000000000b84073f>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=13843 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=15 sclass=netlink_route_socket pig=13841 comm=syz-executor.1 EXT4-fs warning: 13 callbacks suppressed EXT4-fs warning (device sda1): ext4_group_extend:1738: can't shrink FS - resize aborted SELinux: unrecognized netlink message: protocol=0 nlmsg_type=15 sclass=netlink_route_socket pig=13862 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=13862 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=46977 sclass=netlink_route_socket pig=13863 comm=syz-executor.2 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=46977 sclass=netlink_route_socket pig=13912 comm=syz-executor.2 selinux_nlmsg_perm: 1 callbacks suppressed SELinux: unrecognized netlink message: protocol=0 nlmsg_type=15 sclass=netlink_route_socket pig=13958 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=13958 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=46977 sclass=netlink_route_socket pig=13949 comm=syz-executor.2 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=15 sclass=netlink_route_socket pig=14008 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=14008 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=15 sclass=netlink_route_socket pig=14020 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=14020 comm=syz-executor.1 EXT4-fs warning (device sda1): ext4_group_extend:1738: can't shrink FS - resize aborted EXT4-fs warning (device sda1): ext4_group_extend:1738: can't shrink FS - resize aborted EXT4-fs warning (device sda1): ext4_group_extend:1738: can't shrink FS - resize aborted EXT4-fs warning (device sda1): ext4_group_extend:1738: can't shrink FS - resize aborted SELinux: unrecognized netlink message: protocol=0 nlmsg_type=46977 sclass=netlink_route_socket pig=14021 comm=syz-executor.2 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=15 sclass=netlink_route_socket pig=14084 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=14084 comm=syz-executor.1 EXT4-fs warning (device sda1): ext4_group_extend:1738: can't shrink FS - resize aborted EXT4-fs warning (device sda1): ext4_group_extend:1738: can't shrink FS - resize aborted EXT4-fs warning (device sda1): ext4_group_extend:1738: can't shrink FS - resize aborted EXT4-fs warning (device sda1): ext4_group_extend:1738: can't shrink FS - resize aborted EXT4-fs warning (device sda1): ext4_group_extend:1738: can't shrink FS - resize aborted EXT4-fs warning (device sda1): ext4_group_extend:1738: can't shrink FS - resize aborted selinux_nlmsg_perm: 9 callbacks suppressed SELinux: unrecognized netlink message: protocol=0 nlmsg_type=46977 sclass=netlink_route_socket pig=14147 comm=syz-executor.2 ip6_tunnel: ´ xmit: Local address not yet configured! ip6_tunnel: ip6tnl1 xmit: Local address not yet configured! SELinux: unrecognized netlink message: protocol=0 nlmsg_type=15 sclass=netlink_route_socket pig=14206 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=14206 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=46977 sclass=netlink_route_socket pig=14209 comm=syz-executor.2 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=15 sclass=netlink_route_socket pig=14244 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=14253 comm=syz-executor.1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=46977 sclass=netlink_route_socket pig=14227 comm=syz-executor.2