[?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. [ 18.071158] audit: type=1400 audit(1519100177.004:6): avc: denied { map } for pid=4116 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 '10.128.15.228' (ECDSA) to the list of known hosts. syzkaller login: [ 24.325453] audit: type=1400 audit(1519100183.259:7): avc: denied { map } for pid=4130 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 04:16:23 parsed 1 programs 2018/02/20 04:16:23 executed programs: 0 [ 24.589600] audit: type=1400 audit(1519100183.523:8): avc: denied { map } for pid=4130 comm="syz-execprog" path="/root/syzkaller-shm725407022" 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 [ 24.605448] IPVS: ftp: loaded support on port[0] = 21 [ 24.615251] audit: type=1400 audit(1519100183.531:9): avc: denied { sys_admin } for pid=4135 comm="syz-executor0" capability=21 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 [ 24.650790] audit: type=1400 audit(1519100183.584:10): avc: denied { net_admin } for pid=4137 comm="syz-executor0" capability=12 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 [ 24.849767] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 25.182488] audit: type=1400 audit(1519100184.116:11): avc: denied { sys_chroot } for pid=4137 comm="syz-executor0" capability=18 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 [ 25.209407] audit: type=1400 audit(1519100184.143:12): avc: denied { net_raw } for pid=4265 comm="syz-executor0" capability=13 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 [ 25.212694] [ 25.235149] ===================================== [ 25.239957] WARNING: bad unlock balance detected! [ 25.244770] 4.16.0-rc1+ #232 Not tainted [ 25.248795] ------------------------------------- [ 25.253605] syz-executor0/4265 is trying to release lock (rcu_read_lock_bh) at: [ 25.261032] [] hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 25.268015] but there are no more locks to release! [ 25.273004] [ 25.273004] other info that might help us debug this: [ 25.279644] 2 locks held by syz-executor0/4265: [ 25.284278] #0: (rcu_read_lock){....}, at: [<0000000006cd9db9>] netif_receive_skb_internal+0xa2/0x670 [ 25.293788] #1: (rcu_read_lock){....}, at: [<0000000022cbb4de>] ipv6_rcv+0x1446/0x1fa0 [ 25.301990] [ 25.301990] stack backtrace: [ 25.306458] CPU: 0 PID: 4265 Comm: syz-executor0 Not tainted 4.16.0-rc1+ #232 [ 25.313697] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.323022] Call Trace: [ 25.325584] dump_stack+0x194/0x257 [ 25.329181] ? arch_local_irq_restore+0x53/0x53 [ 25.333822] ? hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 25.339243] print_unlock_imbalance_bug+0x12f/0x140 [ 25.344229] lock_release+0x6fe/0xa40 [ 25.348002] ? hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 25.353433] ? lock_downgrade+0x980/0x980 [ 25.357549] ? lock_release+0xa40/0xa40 [ 25.361495] ? __raw_spin_lock_init+0x1c/0x100 [ 25.366045] ? do_raw_spin_trylock+0x190/0x190 [ 25.370602] hashlimit_mt_common.isra.10+0x1c08/0x2610 [ 25.375850] ? dsthash_find+0x5b0/0x5b0 [ 25.379795] ? __lock_acquire+0x664/0x3e00 [ 25.383996] ? __lock_acquire+0x664/0x3e00 [ 25.388205] ? lock_release+0xa40/0xa40 [ 25.392153] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.397314] ? __lock_acquire+0x664/0x3e00 [ 25.401518] ? get_page_from_freelist+0x2deb/0x52d0 [ 25.406509] hashlimit_mt+0x78/0x90 [ 25.410107] ? hashlimit_mt+0x78/0x90 [ 25.413877] ip6t_do_table+0x98d/0x1a30 [ 25.417824] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.422982] ? check_noncircular+0x20/0x20 [ 25.427188] ? ip6t_error+0x60/0x60 [ 25.430783] ? find_held_lock+0x35/0x1d0 [ 25.434815] ? check_noncircular+0x20/0x20 [ 25.439022] ? lock_acquire+0x1d5/0x580 [ 25.442966] ? lock_acquire+0x1d5/0x580 [ 25.446910] ? ipv6_rcv+0x1446/0x1fa0 [ 25.450679] ? lock_release+0xa40/0xa40 [ 25.454624] ip6table_raw_hook+0x65/0x80 [ 25.458656] nf_hook_slow+0xba/0x1a0 [ 25.462339] ipv6_rcv+0x1687/0x1fa0 [ 25.465937] ? ip6_rcv_finish+0x8c0/0x8c0 [ 25.470052] ? lock_downgrade+0x980/0x980 [ 25.474169] ? lock_release+0xa40/0xa40 [ 25.478113] ? is_bpf_text_address+0xa4/0x120 [ 25.482578] ? ip6_input+0x560/0x560 [ 25.486260] ? ip6_rcv_finish+0x8c0/0x8c0 [ 25.490378] __netif_receive_skb_core+0x1a41/0x3460 [ 25.495364] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.500545] ? nf_ingress+0x9f0/0x9f0 [ 25.504327] ? __skb_flow_dissect+0x4ce/0x3f00 [ 25.508877] ? do_syscall_64+0x282/0x940 [ 25.512906] ? entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 25.518241] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.523401] ? __skb_flow_get_ports+0x420/0x420 [ 25.528045] ? check_noncircular+0x20/0x20 [ 25.532250] ? __lock_is_held+0xb6/0x140 [ 25.536280] ? print_irqtrace_events+0x270/0x270 [ 25.541010] ? find_held_lock+0x35/0x1d0 [ 25.545046] ? lock_downgrade+0x980/0x980 [ 25.549165] ? tun_build_skb.isra.50+0xb81/0x1850 [ 25.553979] ? pvclock_read_flags+0x160/0x160 [ 25.558444] ? lock_acquire+0x1d5/0x580 [ 25.562385] ? lock_acquire+0x1d5/0x580 [ 25.566328] ? netif_receive_skb_internal+0xa2/0x670 [ 25.571401] ? ktime_get_with_offset+0x2c1/0x420 [ 25.576125] ? lock_release+0xa40/0xa40 [ 25.580069] ? do_gettimeofday+0x190/0x190 [ 25.584273] ? tun_build_skb.isra.50+0x397/0x1850 [ 25.589088] __netif_receive_skb+0x2c/0x1b0 [ 25.593379] ? __netif_receive_skb+0x2c/0x1b0 [ 25.597843] netif_receive_skb_internal+0x10b/0x670 [ 25.602826] ? dev_cpu_dead+0xb00/0xb00 [ 25.606772] ? rcu_pm_notify+0xc0/0xc0 [ 25.610629] netif_receive_skb+0xae/0x390 [ 25.614748] ? print_irqtrace_events+0x270/0x270 [ 25.619479] ? netif_receive_skb_internal+0x670/0x670 [ 25.624645] ? find_held_lock+0x35/0x1d0 [ 25.628675] ? tun_rx_batched.isra.52+0x5c4/0x870 [ 25.633490] tun_rx_batched.isra.52+0x5ee/0x870 [ 25.638126] ? skb_probe_transport_header.constprop.68+0x14a/0x2f0 [ 25.644414] ? tun_sock_write_space+0x370/0x370 [ 25.649055] tun_get_user+0x25de/0x3940 [ 25.653005] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 25.658171] ? find_held_lock+0x35/0x1d0 [ 25.662202] ? futex_wake+0x566/0x680 [ 25.665972] ? tun_build_skb.isra.50+0x1850/0x1850 [ 25.670870] ? lock_release+0xa40/0xa40 [ 25.674820] ? clear_huge_page+0x309/0x730 [ 25.679031] ? mmdrop+0x18/0x30 [ 25.682282] ? drop_futex_key_refs.isra.13+0x63/0xa0 [ 25.687355] ? find_held_lock+0x35/0x1d0 [ 25.691387] ? tun_get+0x1ab/0x2e0 [ 25.694896] ? lock_release+0xa40/0xa40 [ 25.698839] ? __lock_is_held+0xb6/0x140 [ 25.702871] ? tun_get+0x1d4/0x2e0 [ 25.706378] ? tun_do_read+0x26c0/0x26c0 [ 25.710409] ? __check_object_size+0x8b/0x530 [ 25.714875] ? rcu_note_context_switch+0x710/0x710 [ 25.719775] tun_chr_write_iter+0xbd/0x1c0 [ 25.723978] do_iter_readv_writev+0x55c/0x830 [ 25.728442] ? vfs_dedupe_file_range+0x8f0/0x8f0 [ 25.733171] ? rw_verify_area+0xe5/0x2b0 [ 25.737200] do_iter_write+0x154/0x540 [ 25.741056] ? dup_iter+0x260/0x260 [ 25.744652] vfs_writev+0x18a/0x340 [ 25.748248] ? vfs_iter_write+0xb0/0xb0 [ 25.752193] ? __fdget_pos+0x130/0x190 [ 25.756051] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 25.760600] ? __fdget_raw+0x20/0x20 [ 25.764285] do_writev+0xfc/0x2a0 [ 25.767705] ? do_writev+0xfc/0x2a0 [ 25.771301] ? vfs_writev+0x340/0x340 [ 25.775070] ? mm_fault_error+0x2c0/0x2c0 [ 25.779188] ? move_addr_to_kernel+0x60/0x60 [ 25.783565] SyS_writev+0x27/0x30 [ 25.786983] ? SyS_readv+0x30/0x30 [ 25.790494] do_syscall_64+0x282/0x940 [ 25.794347] ? __do_page_fault+0xc90/0xc90 [ 25.798553] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.804057] ? syscall_return_slowpath+0x550/0x550 [ 25.808961] ? syscall_return_slowpath+0x2ac/0x550 [ 25.813860] ? entry_SYSCALL_64_after_hwframe+0x36/0x9b [ 25.819190] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.824001] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 25.829171] RIP: 0033:0x453c60 [ 25.832329] RSP: 002b:0000000000a