=============================== [ 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.2/6480: #0: (rcu_read_lock_bh){......}, at: [<0000000003cc1722>] ip_finish_output2+0x20b/0x1280 net/ipv4/ip_output.c:198 #1: (rcu_read_lock_bh){......}, at: [<00000000ea9914c5>] __dev_queue_xmit+0x1d4/0x1bd0 net/core/dev.c:3407 #2: (_xmit_TUNNEL6#2){+.-...}, at: [<00000000080c010f>] spin_lock include/linux/spinlock.h:302 [inline] #2: (_xmit_TUNNEL6#2){+.-...}, at: [<00000000080c010f>] __netif_tx_lock include/linux/netdevice.h:3573 [inline] #2: (_xmit_TUNNEL6#2){+.-...}, at: [<00000000080c010f>] __dev_queue_xmit+0x1116/0x1bd0 net/core/dev.c:3469 #3: (slock-AF_INET){+.-...}, at: [<000000007703bbb1>] spin_trylock include/linux/spinlock.h:312 [inline] #3: (slock-AF_INET){+.-...}, at: [<000000007703bbb1>] icmp_xmit_lock net/ipv4/icmp.c:220 [inline] #3: (slock-AF_INET){+.-...}, at: [<000000007703bbb1>] __icmp_send+0x48b/0x1420 net/ipv4/icmp.c:656 stack backtrace: CPU: 0 PID: 6480 Comm: syz-executor.2 Not tainted 4.9.205-syzkaller #0 ffff8801a475edd8 ffffffff81b55e6b ffff8801a87b9000 0000000000000000 0000000000000002 00000000000000cd ffff8801aa9f97c0 ffff8801a475ee08 ffffffff81406997 ffff8801a87b9058 ffff8801a475ef28 ffff8801c84d3300 Call Trace: [<000000001cab16b3>] __dump_stack lib/dump_stack.c:15 [inline] [<000000001cab16b3>] dump_stack+0xcb/0x130 lib/dump_stack.c:56 [<00000000da85b75b>] lockdep_rcu_suspicious.cold+0x10a/0x149 kernel/locking/lockdep.c:4458 [<00000000990ce290>] __in_dev_get_rcu include/linux/inetdevice.h:205 [inline] [<00000000990ce290>] fib_compute_spec_dst+0x6c4/0xcc0 net/ipv4/fib_frontend.c:284 [<0000000097fe69b0>] __ip_options_echo+0x4be/0x13e0 net/ipv4/ip_options.c:177 [<00000000b9d593b3>] __icmp_send+0x648/0x1420 net/ipv4/icmp.c:685 [<00000000a1de8ee2>] ipv4_send_dest_unreach net/ipv4/route.c:1203 [inline] [<00000000a1de8ee2>] ipv4_link_failure+0x460/0x850 net/ipv4/route.c:1210 [<000000003672d63b>] dst_link_failure include/net/dst.h:490 [inline] [<000000003672d63b>] vti6_xmit net/ipv6/ip6_vti.c:522 [inline] [<000000003672d63b>] vti6_tnl_xmit+0xb08/0x17f0 net/ipv6/ip6_vti.c:561 [<00000000e4e8738a>] __netdev_start_xmit include/linux/netdevice.h:4072 [inline] [<00000000e4e8738a>] netdev_start_xmit include/linux/netdevice.h:4081 [inline] [<00000000e4e8738a>] xmit_one net/core/dev.c:2977 [inline] [<00000000e4e8738a>] dev_hard_start_xmit+0x195/0x8b0 net/core/dev.c:2993 [<00000000cd2500f4>] __dev_queue_xmit+0x11a3/0x1bd0 net/core/dev.c:3473 [<00000000a8e507bd>] dev_queue_xmit+0x18/0x20 net/core/dev.c:3506 [<00000000ae40e93e>] neigh_direct_output+0x16/0x20 net/core/neighbour.c:1368 [<00000000671afb18>] dst_neigh_output include/net/dst.h:470 [inline] [<00000000671afb18>] ip_finish_output2+0x6a2/0x1280 net/ipv4/ip_output.c:225 [<00000000616f13a7>] ip_finish_output+0x3c4/0xce0 net/ipv4/ip_output.c:313 [<00000000be12256a>] NF_HOOK_COND include/linux/netfilter.h:246 [inline] [<00000000be12256a>] ip_output+0x1ec/0x5b0 net/ipv4/ip_output.c:401 [<00000000bd98dbcd>] dst_output include/net/dst.h:507 [inline] [<00000000bd98dbcd>] NF_HOOK_THRESH include/linux/netfilter.h:232 [inline] [<00000000bd98dbcd>] NF_HOOK include/linux/netfilter.h:255 [inline] [<00000000bd98dbcd>] raw_send_hdrinc net/ipv4/raw.c:421 [inline] [<00000000bd98dbcd>] raw_sendmsg+0x1c5c/0x23e0 net/ipv4/raw.c:643 [<000000000769be11>] inet_sendmsg+0x202/0x4d0 net/ipv4/af_inet.c:766 [<000000001bb99167>] sock_sendmsg_nosec net/socket.c:649 [inline] [<000000001bb99167>] sock_sendmsg+0xbe/0x110 net/socket.c:659 [<000000004bcfbe22>] sock_write_iter+0x235/0x3d0 net/socket.c:857 [<000000001109c4b0>] new_sync_write fs/read_write.c:498 [inline] [<000000001109c4b0>] __vfs_write+0x3c1/0x560 fs/read_write.c:511 [<00000000955b785c>] vfs_write+0x185/0x520 fs/read_write.c:559 [<0000000077666597>] SYSC_write fs/read_write.c:607 [inline] [<0000000077666597>] SyS_write+0x121/0x270 fs/read_write.c:599 [<0000000070c28a62>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<0000000093024bac>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb FAT-fs (loop2): codepage cp437 not found audit: type=1400 audit(2000000454.430:248): avc: denied { create } for pid=6870 comm="syz-executor.2" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=0 ip6_tunnel: „ xmit: Local address not yet configured! audit: type=1400 audit(2000000456.360:249): avc: denied { create } for pid=7685 comm="syz-executor.5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=0 ip6_tunnel:  xmit: Local address not yet configured! ip6_tunnel: ƒ xmit: Local address not yet configured! SELinux: unrecognized netlink message: protocol=6 nlmsg_type=166 sclass=netlink_xfrm_socket pig=7850 comm=syz-executor.5 audit: type=1400 audit(2000000457.100:250): avc: denied { create } for pid=7930 comm="syz-executor.3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=0 audit: type=1400 audit(2000000457.410:251): avc: denied { create } for pid=8044 comm="syz-executor.3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=0 audit: type=1400 audit(2000000457.720:252): avc: denied { create } for pid=8127 comm="syz-executor.3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=0 FAT-fs (loop3): Unrecognized mount option "obj_role=keyring" or missing value audit: type=1400 audit(2000000458.880:253): avc: denied { create } for pid=8310 comm="syz-executor.0" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_connector_socket permissive=0 audit: type=1400 audit(2000000459.000:254): avc: denied { create } for pid=8325 comm="syz-executor.3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=0 SELinux: unrecognized netlink message: protocol=6 nlmsg_type=21106 sclass=netlink_xfrm_socket pig=8384 comm=syz-executor.5 audit: type=1400 audit(2000000459.170:255): avc: denied { create } for pid=8412 comm="syz-executor.3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=0