====================================================== WARNING: possible circular locking dependency detected 4.15.0+ #292 Not tainted ------------------------------------------------------ syz-executor5/5678 is trying to acquire lock: (sk_lock-AF_INET){+.+.}, at: [<000000001806fe5b>] lock_sock include/net/sock.h:1461 [inline] (sk_lock-AF_INET){+.+.}, at: [<000000001806fe5b>] do_ip_setsockopt.isra.12+0x1d9/0x3210 net/ipv4/ip_sockglue.c:646 but task is already holding lock: (rtnl_mutex){+.+.}, at: [<000000002e42e17c>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 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:74 register_netdevice_notifier+0xad/0x860 net/core/dev.c:1607 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:1141 [inline] do_ipt_set_ctl+0x370/0x5f0 net/ipv4/netfilter/ip_tables.c:1675 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:1260 sctp_setsockopt+0x2b6/0x61d0 net/sctp/socket.c:4104 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2978 SYSC_setsockopt net/socket.c:1849 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1828 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:2780 lock_sock include/net/sock.h:1461 [inline] do_ip_setsockopt.isra.12+0x1d9/0x3210 net/ipv4/ip_sockglue.c:646 ip_setsockopt+0x3a/0xb0 net/ipv4/ip_sockglue.c:1252 tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2905 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2978 SYSC_setsockopt net/socket.c:1849 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1828 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-executor5/5678: #0: (rtnl_mutex){+.+.}, at: [<000000002e42e17c>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74 stack backtrace: CPU: 0 PID: 5678 Comm: syz-executor5 Not tainted 4.15.0+ #292 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:2780 lock_sock include/net/sock.h:1461 [inline] do_ip_setsockopt.isra.12+0x1d9/0x3210 net/ipv4/ip_sockglue.c:646 ip_setsockopt+0x3a/0xb0 net/ipv4/ip_sockglue.c:1252 tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2905 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2978 SYSC_setsockopt net/socket.c:1849 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1828 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x453299 RSP: 002b:00007f72e8df5c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299 RDX: 000000000000002a RSI: 0000000000000000 RDI: 0000000000000013 RBP: 0000000000000427 R08: 0000000000000090 R09: 0000000000000000 R10: 0000000020139f70 R11: 0000000000000212 R12: 00000000006f5448 R13: 00000000ffffffff R14: 00007f72e8df66d4 R15: 0000000000000000 capability: warning: `syz-executor2' uses 32-bit capabilities (legacy support in use) sg_write: data in/out 700410/58 bytes for SCSI command 0xe2-- guessing data in; program syz-executor0 not setting count and/or reply_len properly syz-executor5 (5783): /proc/5775/oom_adj is deprecated, please use /proc/5775/oom_score_adj instead. QAT: Invalid ioctl QAT: Invalid ioctl mmap: syz-executor0 (5934) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.txt. QAT: failed to copy from user. QAT: failed to copy from user. QAT: Invalid ioctl QAT: Invalid ioctl dccp_v4_rcv: dropped packet with invalid checksum ip6t_REJECT: TCP_RESET illegal for non-tcp ip6t_REJECT: TCP_RESET illegal for non-tcp dccp_invalid_packet: P.Data Offset(4) too small dccp_invalid_packet: P.Data Offset(4) too small netlink: 3 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor2'. Cannot find add_set index 0 as target Cannot find add_set index 0 as target encrypted_key: insufficient parameters specified encrypted_key: insufficient parameters specified QAT: failed to copy from user. QAT: failed to copy from user. QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl netlink: 'syz-executor2': attribute type 3 has an invalid length. netlink: 'syz-executor2': attribute type 3 has an invalid length. QAT: Invalid ioctl QAT: Invalid ioctl xt_l2tp: unknown flags: c2 xt_l2tp: unknown flags: c2 syz-executor0 uses obsolete (PF_INET,SOCK_PACKET) binder: 6996:6997 ioctl c0306201 20013fd0 returned -14 binder: 6996:6997 BC_CLEAR_DEATH_NOTIFICATION death notification not active binder: 6997 RLIMIT_NICE not set binder: 6996:7009 BC_DEAD_BINDER_DONE 0000000000000000 not found binder: 6996:7009 got transaction to invalid handle binder: 6996:7009 transaction failed 29201/-22, size 0-0 line 2842 binder: BINDER_SET_CONTEXT_MGR already set binder: 6996:7033 ioctl c0306201 20013fd0 returned -14 binder: 6996:7023 ioctl 40046207 0 returned -16 binder: 6996:7009 BC_CLEAR_DEATH_NOTIFICATION death notification not active binder: undelivered TRANSACTION_ERROR: 29201 capability: warning: `syz-executor6' uses deprecated v2 capabilities in a way that may be insecure kauditd_printk_skb: 108 callbacks suppressed audit: type=1326 audit(1517575791.778:142): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=7166 comm="syz-executor4" exe="/root/syz-executor4" sig=9 arch=c000003e syscall=202 compat=0 ip=0x453299 code=0x0 audit: type=1400 audit(1517575791.830:143): avc: denied { ioctl } for pid=7189 comm="syz-executor5" path="socket:[18770]" dev="sockfs" ino=18770 ioctlcmd=0x6415 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=1 audit: type=1326 audit(1517575791.836:144): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=7166 comm="syz-executor4" exe="/root/syz-executor4" sig=9 arch=c000003e syscall=202 compat=0 ip=0x453299 code=0x0 TCP: request_sock_TCPv6: Possible SYN flooding on port 20030. Sending cookies. Check SNMP counters. xt_cgroup: both path and classid specified xt_cgroup: both path and classid specified