[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 17.981829] audit: type=1400 audit(1519293336.997:6): avc: denied { map } for pid=4147 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 '10.128.15.223' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 syzkaller login: [ 35.210027] audit: type=1400 audit(1519293354.225:7): avc: denied { map } for pid=4165 comm="syzkaller220561" path="/root/syzkaller220561513" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported [ 35.492796] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument executing program [ 35.869539] [ 35.871210] ===================================== [ 35.876019] WARNING: bad unlock balance detected! [ 35.880832] 4.16.0-rc2+ #323 Not tainted [ 35.884861] ------------------------------------- [ 35.889673] syzkaller220561/4165 is trying to release lock (rcu_read_lock_bh) at: [ 35.897709] [] hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 35.904687] but there are no more locks to release! [ 35.909668] [ 35.909668] other info that might help us debug this: [ 35.916302] 3 locks held by syzkaller220561/4165: [ 35.921118] #0: (&tfile->napi_mutex){+.+.}, at: [<0000000024cfc7be>] tun_get_user+0xe93/0x3810 [ 35.930022] #1: (rcu_read_lock){....}, at: [<00000000fb09a5ed>] netif_receive_skb_internal+0xa2/0x670 [ 35.939529] #2: (rcu_read_lock){....}, at: [<00000000c1eae54e>] ipv6_rcv+0x1446/0x1fa0 [ 35.947736] [ 35.947736] stack backtrace: [ 35.952208] CPU: 1 PID: 4165 Comm: syzkaller220561 Not tainted 4.16.0-rc2+ #323 [ 35.959623] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.968947] Call Trace: [ 35.971506] dump_stack+0x194/0x257 [ 35.975103] ? arch_local_irq_restore+0x53/0x53 [ 35.979747] ? hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 35.985167] print_unlock_imbalance_bug+0x12f/0x140 [ 35.990152] lock_release+0x6fe/0xa40 [ 35.993924] ? hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 35.999341] ? lock_downgrade+0x980/0x980 [ 36.003466] ? lock_release+0xa40/0xa40 [ 36.007413] ? __raw_spin_lock_init+0x1c/0x100 [ 36.011965] ? do_raw_spin_trylock+0x190/0x190 [ 36.016520] hashlimit_mt_common.isra.10+0x1c08/0x2610 [ 36.021771] ? dsthash_find+0x5b0/0x5b0 [ 36.025715] ? __lock_acquire+0x664/0x3e00 [ 36.029920] ? check_noncircular+0x20/0x20 [ 36.034125] ? __put_compound_page+0xc0/0xc0 [ 36.038506] ? lock_release+0xa40/0xa40 [ 36.042448] ? __bfs+0xaa/0x750 [ 36.045698] ? bpf_prog_kallsyms_find+0xbd/0x440 [ 36.050425] ? lock_downgrade+0x980/0x980 [ 36.054544] hashlimit_mt+0x78/0x90 [ 36.058141] ? hashlimit_mt+0x78/0x90 [ 36.061915] ip6t_do_table+0x98d/0x1a30 [ 36.065861] ? is_bpf_text_address+0x7b/0x120 [ 36.070324] ? lock_downgrade+0x980/0x980 [ 36.074443] ? check_noncircular+0x20/0x20 [ 36.078647] ? ip6t_error+0x60/0x60 [ 36.082244] ? find_held_lock+0x35/0x1d0 [ 36.086274] ? check_noncircular+0x20/0x20 [ 36.090493] ? lock_acquire+0x1d5/0x580 [ 36.094434] ? lock_acquire+0x1d5/0x580 [ 36.098376] ? ipv6_rcv+0x1446/0x1fa0 [ 36.102145] ? lock_release+0xa40/0xa40 [ 36.106100] ip6table_raw_hook+0x65/0x80 [ 36.110134] nf_hook_slow+0xba/0x1a0 [ 36.113817] ipv6_rcv+0x1687/0x1fa0 [ 36.117414] ? ip6_rcv_finish+0x8c0/0x8c0 [ 36.121533] ? __lock_acquire+0x664/0x3e00 [ 36.125748] ? ip6_input+0x560/0x560 [ 36.129434] ? ip6_rcv_finish+0x8c0/0x8c0 [ 36.133553] __netif_receive_skb_core+0x1a41/0x3460 [ 36.138541] ? nf_ingress+0x9f0/0x9f0 [ 36.142313] ? __skb_flow_get_ports+0x3b0/0x420 [ 36.146955] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 36.152114] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 36.157275] ? print_irqtrace_events+0x270/0x270 [ 36.162000] ? check_noncircular+0x20/0x20 [ 36.166213] ? check_noncircular+0x20/0x20 [ 36.170420] ? lock_downgrade+0x980/0x980 [ 36.174538] ? check_noncircular+0x20/0x20 [ 36.178741] ? lock_release+0xa40/0xa40 [ 36.182682] ? is_bpf_text_address+0xa4/0x120 [ 36.187147] ? find_held_lock+0x35/0x1d0 [ 36.191178] ? print_irqtrace_events+0x270/0x270 [ 36.195907] ? netif_receive_skb_internal+0x1d7/0x670 [ 36.201065] ? lock_downgrade+0x980/0x980 [ 36.205182] ? pvclock_read_flags+0x160/0x160 [ 36.209646] ? mark_held_locks+0xaf/0x100 [ 36.213763] ? lock_acquire+0x1d5/0x580 [ 36.217706] ? lock_acquire+0x1d5/0x580 [ 36.221649] ? netif_receive_skb_internal+0xa2/0x670 [ 36.226723] ? ktime_get_with_offset+0x2c1/0x420 [ 36.231450] ? lock_release+0xa40/0xa40 [ 36.235392] ? do_gettimeofday+0x190/0x190 [ 36.239612] ? lock_release+0xa40/0xa40 [ 36.243556] __netif_receive_skb+0x2c/0x1b0 [ 36.247847] ? __netif_receive_skb+0x2c/0x1b0 [ 36.252312] netif_receive_skb_internal+0x10b/0x670 [ 36.257296] ? dev_cpu_dead+0xb00/0xb00 [ 36.261243] ? net_rx_action+0x1910/0x1910 [ 36.265449] ? eth_type_trans+0x2b2/0x710 [ 36.269568] ? eth_gro_receive+0x820/0x820 [ 36.273774] napi_gro_frags+0x58a/0xaf0 [ 36.277718] ? napi_gro_receive+0x500/0x500 [ 36.282011] ? tun_get_user+0x26f7/0x3810 [ 36.286129] tun_get_user+0x2720/0x3810 [ 36.290819] ? kernel_text_address+0x102/0x140 [ 36.295400] ? tun_build_skb.isra.50+0x1850/0x1850 [ 36.300303] ? xt_table_unlock+0x52/0x60 [ 36.304336] ? lock_downgrade+0x980/0x980 [ 36.308455] ? rawv6_setsockopt+0x4a/0xf0 [ 36.312572] ? SyS_setsockopt+0x189/0x360 [ 36.316690] ? do_syscall_64+0x280/0x940 [ 36.320722] ? tun_get+0x1ab/0x2e0 [ 36.324232] ? lock_release+0xa40/0xa40 [ 36.328178] ? __lock_is_held+0xb6/0x140 [ 36.332212] ? tun_get+0x1d4/0x2e0 [ 36.335718] ? tun_do_read+0x26c0/0x26c0 [ 36.339748] ? __check_object_size+0x8b/0x530 [ 36.344215] ? rcu_note_context_switch+0x710/0x710 [ 36.349116] tun_chr_write_iter+0xbd/0x1c0 [ 36.353323] do_iter_readv_writev+0x55c/0x830 [ 36.357788] ? vfs_dedupe_file_range+0x8f0/0x8f0 [ 36.362515] ? rw_verify_area+0xe5/0x2b0 [ 36.366544] do_iter_write+0x154/0x540 [ 36.370404] ? dup_iter+0x260/0x260 [ 36.374000] ? do_ip6t_set_ctl+0x104/0x5f0 [ 36.378206] vfs_writev+0x18a/0x340 [ 36.381801] ? vfs_iter_write+0xb0/0xb0 [ 36.385759] ? nf_setsockopt+0x93/0xc0 [ 36.389620] ? __fdget_pos+0x130/0x190 [ 36.393479] ? __fdget_raw+0x20/0x20 [ 36.397162] ? sock_common_setsockopt+0x95/0xd0 [ 36.401800] do_writev+0xfc/0x2a0 [ 36.405224] ? do_writev+0xfc/0x2a0 [ 36.408820] ? vfs_writev+0x340/0x340 [ 36.412591] ? mm_fault_error+0x2c0/0x2c0 [ 36.416710] ? move_addr_to_kernel+0x60/0x60 [ 36.421089] ? SyS_readv+0x30/0x30 [ 36.424596] SyS_writev+0x27/0x30 [ 36.428021] do_syscall_64+0x280/0x940 [ 36.431877] ? __do_page_fault+0xc90/0xc90 [ 36.436084] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 36.440809] ? syscall_return_slowpath+0x550/0x550 [ 36.445707] ? syscall_return_slowpath+0x2ac/0x550 [ 36.450607] ? prepare_exit_to_usermode+0x350/0x350 [ 36.455596] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 36.460929] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.465741] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 36.470899] R