====================================================== WARNING: possible circular locking dependency detected 4.15.0+ #288 Not tainted ------------------------------------------------------ syz-executor3/5845 is trying to acquire lock: (sk_lock-AF_INET){+.+.}, at: [<00000000301f0511>] lock_sock include/net/sock.h:1459 [inline] (sk_lock-AF_INET){+.+.}, at: [<00000000301f0511>] do_ip_setsockopt.isra.12+0x1d9/0x32e0 net/ipv4/ip_sockglue.c:646 but task is already holding lock: (rtnl_mutex){+.+.}, at: [<000000008d6faa4e>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (rtnl_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72 register_netdevice_notifier+0xad/0x860 net/core/dev.c:1590 tee_tg_check+0x1a0/0x280 net/netfilter/xt_TEE.c:106 xt_check_target+0x22c/0x7d0 net/netfilter/x_tables.c:845 check_target net/ipv4/netfilter/ip_tables.c:513 [inline] find_check_entry.isra.8+0x8c8/0xcb0 net/ipv4/netfilter/ip_tables.c:554 translate_table+0xed1/0x1610 net/ipv4/netfilter/ip_tables.c:725 do_replace net/ipv4/netfilter/ip_tables.c:1143 [inline] do_ipt_set_ctl+0x370/0x5f0 net/ipv4/netfilter/ip_tables.c:1677 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 ip_setsockopt+0xa1/0xb0 net/ipv4/ip_sockglue.c:1256 raw_setsockopt+0xb7/0xd0 net/ipv4/raw.c:857 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2968 SYSC_setsockopt net/socket.c:1831 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1810 entry_SYSCALL_64_fastpath+0x29/0xa0 -> #0 (sk_lock-AF_INET){+.+.}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920 lock_sock_nested+0xc2/0x110 net/core/sock.c:2770 lock_sock include/net/sock.h:1459 [inline] do_ip_setsockopt.isra.12+0x1d9/0x32e0 net/ipv4/ip_sockglue.c:646 ip_setsockopt+0x3a/0xb0 net/ipv4/ip_sockglue.c:1248 sctp_setsockopt+0x2a0/0x5de0 net/sctp/socket.c:4074 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2968 SYSC_setsockopt net/socket.c:1831 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1810 entry_SYSCALL_64_fastpath+0x29/0xa0 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(rtnl_mutex); lock(sk_lock-AF_INET); lock(rtnl_mutex); lock(sk_lock-AF_INET); *** DEADLOCK *** 1 lock held by syz-executor3/5845: #0: (rtnl_mutex){+.+.}, at: [<000000008d6faa4e>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72 stack backtrace: CPU: 0 PID: 5845 Comm: syz-executor3 Not tainted 4.15.0+ #288 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 print_circular_bug.isra.38+0x2cd/0x2dc kernel/locking/lockdep.c:1223 check_prev_add kernel/locking/lockdep.c:1863 [inline] check_prevs_add kernel/locking/lockdep.c:1976 [inline] validate_chain kernel/locking/lockdep.c:2417 [inline] __lock_acquire+0x30a8/0x3e00 kernel/locking/lockdep.c:3431 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920 lock_sock_nested+0xc2/0x110 net/core/sock.c:2770 lock_sock include/net/sock.h:1459 [inline] do_ip_setsockopt.isra.12+0x1d9/0x32e0 net/ipv4/ip_sockglue.c:646 ip_setsockopt+0x3a/0xb0 net/ipv4/ip_sockglue.c:1248 sctp_setsockopt+0x2a0/0x5de0 net/sctp/socket.c:4074 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2968 SYSC_setsockopt net/socket.c:1831 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1810 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x453299 RSP: 002b:00007f24a4a0ac58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000453299 RDX: 000000000000002a RSI: 0000000000000000 RDI: 0000000000000013 RBP: 00000000000003bf R08: 0000000000000090 R09: 0000000000000000 R10: 0000000020125000 R11: 0000000000000212 R12: 00000000006f4a88 R13: 00000000ffffffff R14: 00007f24a4a0b6d4 R15: 0000000000000003 netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. mmap: syz-executor4 (5904) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.txt. netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium sctp: [Deprecated]: syz-executor1 (pid 5955) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor1 (pid 5961) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead netlink: 'syz-executor7': attribute type 16 has an invalid length. syz-executor6 (6051) used greatest stack depth: 15600 bytes left netlink: 2 bytes leftover after parsing attributes in process `syz-executor7'. netlink: 2 bytes leftover after parsing attributes in process `syz-executor7'. 9pnet_virtio: no channels available for device ./file0 netlink: 2 bytes leftover after parsing attributes in process `syz-executor7'. 9pnet_virtio: no channels available for device ./file0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=60928 sclass=netlink_route_socket pig=6173 comm=syz-executor4 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=60928 sclass=netlink_route_socket pig=6173 comm=syz-executor4 syz-executor4 uses obsolete (PF_INET,SOCK_PACKET) kauditd_printk_skb: 35 callbacks suppressed audit: type=1326 audit(1517451276.663:61): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=6213 comm="syz-executor1" exe="/root/syz-executor1" sig=9 arch=c000003e syscall=202 compat=0 ip=0x453299 code=0x0 device syz4 entered promiscuous mode device syz4 left promiscuous mode device syz4 entered promiscuous mode audit: type=1326 audit(1517451276.776:62): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=6213 comm="syz-executor1" exe="/root/syz-executor1" sig=9 arch=c000003e syscall=202 compat=0 ip=0x453299 code=0x0 audit: type=1326 audit(1517451276.851:63): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=6242 comm="syz-executor6" exe="/root/syz-executor6" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453299 code=0x7ffc0000 audit: type=1326 audit(1517451276.883:64): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=6242 comm="syz-executor6" exe="/root/syz-executor6" sig=0 arch=c000003e syscall=79 compat=0 ip=0x453299 code=0x7ffc0000 audit: type=1326 audit(1517451276.887:65): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=6242 comm="syz-executor6" exe="/root/syz-executor6" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453299 code=0x7ffc0000 audit: type=1326 audit(1517451276.891:66): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=6242 comm="syz-executor6" exe="/root/syz-executor6" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453299 code=0x7ffc0000 audit: type=1326 audit(1517451276.892:67): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=6242 comm="syz-executor6" exe="/root/syz-executor6" sig=0 arch=c000003e syscall=9 compat=0 ip=0x453299 code=0x7ffc0000 audit: type=1326 audit(1517451276.902:68): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=6242 comm="syz-executor6" exe="/root/syz-executor6" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453299 code=0x7ffc0000 audit: type=1326 audit(1517451276.902:69): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=6242 comm="syz-executor6" exe="/root/syz-executor6" sig=0 arch=c000003e syscall=202 compat=0 ip=0x453299 code=0x7ffc0000 audit: type=1326 audit(1517451276.909:70): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=6242 comm="syz-executor6" exe="/root/syz-executor6" sig=0 arch=c000003e syscall=257 compat=0 ip=0x453299 code=0x7ffc0000 Cannot find add_set index 0 as target Cannot find add_set index 0 as target device syz5 entered promiscuous mode Cannot find add_set index 0 as target device syz5 left promiscuous mode syz-executor6 (6389) used greatest stack depth: 15296 bytes left device eql entered promiscuous mode syz-executor5 (6634): attempted to duplicate a private mapping with mremap. This is not supported.