[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 18.457827] audit: type=1400 audit(1519109834.433:6): avc: denied { map } for pid=4167 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.63' (ECDSA) to the list of known hosts. syzkaller login: [ 24.749640] audit: type=1400 audit(1519109840.725:7): avc: denied { map } for pid=4181 comm="syz-execprog" path="/root/syz-execprog" dev="sda1" ino=16479 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 2018/02/20 06:57:20 parsed 1 programs 2018/02/20 06:57:20 executed programs: 0 [ 25.011211] audit: type=1400 audit(1519109840.986:8): avc: denied { map } for pid=4181 comm="syz-execprog" path="/root/syzkaller-shm939904495" dev="sda1" ino=16482 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:file_t:s0 tclass=file permissive=1 [ 25.025633] IPVS: ftp: loaded support on port[0] = 21 [ 25.254475] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 25.584264] [ 25.585915] ===================================== [ 25.590722] WARNING: bad unlock balance detected! [ 25.595543] 4.16.0-rc2+ #320 Not tainted [ 25.599571] ------------------------------------- [ 25.604382] syz-executor0/4316 is trying to release lock (rcu_read_lock_bh) at: [ 25.611811] [] hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 25.618791] but there are no more locks to release! [ 25.623782] [ 25.623782] other info that might help us debug this: [ 25.630418] 3 locks held by syz-executor0/4316: [ 25.635054] #0: (&tfile->napi_mutex){+.+.}, at: [<00000000995aba20>] tun_get_user+0xe6c/0x3940 [ 25.643957] #1: (rcu_read_lock){....}, at: [<00000000130ec3a4>] netif_receive_skb_internal+0xa2/0x670 [ 25.653477] #2: (rcu_read_lock){....}, at: [<000000007ed959fc>] ipv6_rcv+0x1446/0x1fa0 [ 25.661681] [ 25.661681] stack backtrace: [ 25.666159] CPU: 0 PID: 4316 Comm: syz-executor0 Not tainted 4.16.0-rc2+ #320 [ 25.673403] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.682728] Call Trace: [ 25.685288] dump_stack+0x194/0x257 [ 25.688891] ? arch_local_irq_restore+0x53/0x53 [ 25.693534] ? hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 25.698955] print_unlock_imbalance_bug+0x12f/0x140 [ 25.703943] lock_release+0x6fe/0xa40 [ 25.707713] ? hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 25.713143] ? lock_downgrade+0x980/0x980 [ 25.717264] ? lock_release+0xa40/0xa40 [ 25.721208] ? __raw_spin_lock_init+0x1c/0x100 [ 25.725759] ? do_raw_spin_trylock+0x190/0x190 [ 25.730315] hashlimit_mt_common.isra.10+0x1c08/0x2610 [ 25.735568] ? lockdep_on+0x50/0x50 [ 25.739166] ? dsthash_find+0x5b0/0x5b0 [ 25.743109] ? __lock_acquire+0x664/0x3e00 [ 25.747314] ? check_noncircular+0x20/0x20 [ 25.751522] ? lock_release+0xa40/0xa40 [ 25.755466] ? __bfs+0xaa/0x750 [ 25.758717] ? bpf_prog_kallsyms_find+0xbd/0x440 [ 25.763448] ? lock_downgrade+0x980/0x980 [ 25.767572] hashlimit_mt+0x78/0x90 [ 25.771168] ? hashlimit_mt+0x78/0x90 [ 25.774938] ip6t_do_table+0x98d/0x1a30 [ 25.778883] ? is_bpf_text_address+0x7b/0x120 [ 25.783347] ? lock_downgrade+0x980/0x980 [ 25.787467] ? __bfs+0xaa/0x750 [ 25.790718] ? check_noncircular+0x20/0x20 [ 25.794927] ? ip6t_error+0x60/0x60 [ 25.798525] ? find_held_lock+0x35/0x1d0 [ 25.802559] ? check_noncircular+0x20/0x20 [ 25.806774] ? lock_acquire+0x1d5/0x580 [ 25.810716] ? lock_acquire+0x1d5/0x580 [ 25.814659] ? ipv6_rcv+0x1446/0x1fa0 [ 25.818433] ? lock_release+0xa40/0xa40 [ 25.822390] ip6table_raw_hook+0x65/0x80 [ 25.826424] nf_hook_slow+0xba/0x1a0 [ 25.830108] ipv6_rcv+0x1687/0x1fa0 [ 25.833716] ? ip6_rcv_finish+0x8c0/0x8c0 [ 25.837837] ? __lock_acquire+0x664/0x3e00 [ 25.842052] ? ip6_input+0x560/0x560 [ 25.845743] ? ip6_rcv_finish+0x8c0/0x8c0 [ 25.849861] __netif_receive_skb_core+0x1a41/0x3460 [ 25.854846] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.860023] ? nf_ingress+0x9f0/0x9f0 [ 25.863801] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.868960] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.874120] ? print_irqtrace_events+0x270/0x270 [ 25.878844] ? check_noncircular+0x20/0x20 [ 25.883048] ? lock_downgrade+0x980/0x980 [ 25.887166] ? check_noncircular+0x20/0x20 [ 25.891370] ? lock_release+0xa40/0xa40 [ 25.895317] ? find_held_lock+0x35/0x1d0 [ 25.899358] ? print_irqtrace_events+0x270/0x270 [ 25.904087] ? lock_downgrade+0x980/0x980 [ 25.908208] ? pvclock_read_flags+0x160/0x160 [ 25.912674] ? mark_held_locks+0xaf/0x100 [ 25.916793] ? lock_acquire+0x1d5/0x580 [ 25.920735] ? lock_acquire+0x1d5/0x580 [ 25.924680] ? netif_receive_skb_internal+0xa2/0x670 [ 25.929755] ? ktime_get_with_offset+0x2c1/0x420 [ 25.934488] ? lock_release+0xa40/0xa40 [ 25.938434] ? do_gettimeofday+0x190/0x190 [ 25.942640] ? lock_release+0xa40/0xa40 [ 25.946587] __netif_receive_skb+0x2c/0x1b0 [ 25.950878] ? __netif_receive_skb+0x2c/0x1b0 [ 25.955355] netif_receive_skb_internal+0x10b/0x670 [ 25.960344] ? dev_cpu_dead+0xb00/0xb00 [ 25.964290] ? net_rx_action+0x1910/0x1910 [ 25.968495] ? eth_type_trans+0x2b2/0x710 [ 25.972616] ? eth_gro_receive+0x820/0x820 [ 25.976823] napi_gro_frags+0x58a/0xaf0 [ 25.980769] ? napi_gro_receive+0x500/0x500 [ 25.985073] ? tun_get_user+0x2737/0x3940 [ 25.989190] tun_get_user+0x2760/0x3940 [ 25.993136] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.998296] ? is_bpf_text_address+0xa4/0x120 [ 26.002767] ? tun_build_skb.isra.50+0x1850/0x1850 [ 26.007668] ? find_held_lock+0x35/0x1d0 [ 26.011702] ? xt_table_unlock+0x52/0x60 [ 26.015736] ? mmdrop+0x18/0x30 [ 26.018987] ? drop_futex_key_refs.isra.13+0x63/0xa0 [ 26.024075] ? find_held_lock+0x35/0x1d0 [ 26.028108] ? tun_get+0x1ab/0x2e0 [ 26.031621] ? lock_release+0xa40/0xa40 [ 26.035564] ? __lock_is_held+0xb6/0x140 [ 26.039597] ? tun_get+0x1d4/0x2e0 [ 26.043119] ? tun_do_read+0x26c0/0x26c0 [ 26.047165] ? __check_object_size+0x8b/0x530 [ 26.051636] ? rcu_note_context_switch+0x710/0x710 [ 26.056572] tun_chr_write_iter+0xbd/0x1c0 [ 26.060787] do_iter_readv_writev+0x55c/0x830 [ 26.065264] ? vfs_dedupe_file_range+0x8f0/0x8f0 [ 26.069997] ? rw_verify_area+0xe5/0x2b0 [ 26.074029] do_iter_write+0x154/0x540 [ 26.077899] ? dup_iter+0x260/0x260 [ 26.081499] ? do_ip6t_set_ctl+0x104/0x5f0 [ 26.085710] vfs_writev+0x18a/0x340 [ 26.089310] ? vfs_iter_write+0xb0/0xb0 [ 26.093261] ? nf_setsockopt+0x93/0xc0 [ 26.097122] ? __fdget_pos+0x130/0x190 [ 26.100977] ? __fdget_raw+0x20/0x20 [ 26.104659] do_writev+0xfc/0x2a0 [ 26.108094] ? do_writev+0xfc/0x2a0 [ 26.111689] ? vfs_writev+0x340/0x340 [ 26.115462] ? mm_fault_error+0x2c0/0x2c0 [ 26.119581] ? move_addr_to_kernel+0x60/0x60 [ 26.123961] ? SyS_readv+0x30/0x30 [ 26.127471] SyS_writev+0x27/0x30 [ 26.130900] do_syscall_64+0x280/0x940 [ 26.134758] ? __do_page_fault+0xc90/0xc90 [ 26.138961] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.143689] ? syscall_return_slowpath+0x550/0x550 [ 26.148588] ? syscall_return_slowpath+0x2ac/0x550 [ 26.153486] ? prepare_exit_to_usermode+0x350/0x350 [ 26.158472] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 26.163806] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.168621] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 26.173792] RIP: 0033:0x453c60 [ 26.176958] RSP: 002b:00007ffee3086778 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 [ 26.184636] RAX: fffffff