====================================================== audit: type=1400 audit(1517280765.412:28): avc: denied { map } for pid=5704 comm="syz-executor1" path="/18/file0/bus" dev="ramfs" ino=15654 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:ramfs_t:s0 tclass=file permissive=1 WARNING: possible circular locking dependency detected 4.15.0+ #285 Not tainted ------------------------------------------------------ syz-executor7/5709 is trying to acquire lock: (sk_lock-AF_INET){+.+.}, at: [<0000000028e1e4d0>] lock_sock include/net/sock.h:1461 [inline] (sk_lock-AF_INET){+.+.}, at: [<0000000028e1e4d0>] do_ip_getsockopt+0x1b3/0x2170 net/ipv4/ip_sockglue.c:1331 but task is already holding lock: (rtnl_mutex){+.+.}, at: [<00000000a1ce37d9>] 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:518 [inline] find_check_entry.isra.8+0x8c8/0xcb0 net/ipv4/netfilter/ip_tables.c:559 translate_table+0xed1/0x1610 net/ipv4/netfilter/ip_tables.c:730 do_replace net/ipv4/netfilter/ip_tables.c:1148 [inline] do_ipt_set_ctl+0x370/0x5f0 net/ipv4/netfilter/ip_tables.c:1682 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:3915 lock_sock_nested+0xc2/0x110 net/core/sock.c:2770 lock_sock include/net/sock.h:1461 [inline] do_ip_getsockopt+0x1b3/0x2170 net/ipv4/ip_sockglue.c:1331 ip_getsockopt+0x90/0x220 net/ipv4/ip_sockglue.c:1562 tcp_getsockopt+0x82/0xd0 net/ipv4/tcp.c:3329 sock_common_getsockopt+0x95/0xd0 net/core/sock.c:2927 SYSC_getsockopt net/socket.c:1862 [inline] SyS_getsockopt+0x178/0x340 net/socket.c:1844 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-executor7/5709: #0: (rtnl_mutex){+.+.}, at: [<00000000a1ce37d9>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72 stack backtrace: CPU: 0 PID: 5709 Comm: syz-executor7 Not tainted 4.15.0+ #285 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.37+0x2cd/0x2dc kernel/locking/lockdep.c:1219 check_prev_add kernel/locking/lockdep.c:1859 [inline] check_prevs_add kernel/locking/lockdep.c:1972 [inline] validate_chain kernel/locking/lockdep.c:2413 [inline] __lock_acquire+0x30a8/0x3e00 kernel/locking/lockdep.c:3427 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3915 lock_sock_nested+0xc2/0x110 net/core/sock.c:2770 lock_sock include/net/sock.h:1461 [inline] do_ip_getsockopt+0x1b3/0x2170 net/ipv4/ip_sockglue.c:1331 ip_getsockopt+0x90/0x220 net/ipv4/ip_sockglue.c:1562 tcp_getsockopt+0x82/0xd0 net/ipv4/tcp.c:3329 sock_common_getsockopt+0x95/0xd0 net/core/sock.c:2927 SYSC_getsockopt net/socket.c:1862 [inline] SyS_getsockopt+0x178/0x340 net/socket.c:1844 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x453299 RSP: 002b:00007f3ea231cc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299 RDX: 0000000000000029 RSI: 0000000000000000 RDI: 0000000000000013 RBP: 00000000000003fb R08: 0000000020745000 R09: 0000000000000000 R10: 0000000020000000 R11: 0000000000000212 R12: 00000000006f5028 R13: 00000000ffffffff R14: 00007f3ea231d6d4 R15: 0000000000000000 IPv6: NLM_F_REPLACE set, but no existing node found! binder_alloc: binder_alloc_mmap_handler: 5759 20000000-20002000 already mapped failed -16 binder: BINDER_SET_CONTEXT_MGR already set binder: 5759:5760 ioctl 40046207 0 returned -16 binder: 5759:5766 BC_ACQUIRE_DONE uffffffffffffffff no match binder_alloc: 5759: binder_alloc_buf, no vma binder: 5759:5762 transaction failed 29189/-3, size 40-8 line 2903 binder: release 5759:5760 transaction 2 out, still active binder: undelivered TRANSACTION_COMPLETE binder: send failed reply for transaction 2, target dead device eql entered promiscuous mode