[....] Starting enhanced syslogd: rsyslogd[ 16.251169] audit: type=1400 audit(1519129532.331:5): avc: denied { syslog } for pid=3974 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [?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. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.125427] audit: type=1400 audit(1519129538.206:6): avc: denied { map } for pid=4114 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 Warning: Permanently added '10.128.0.19' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 [ 28.505335] audit: type=1400 audit(1519129544.586:7): avc: denied { map } for pid=4128 comm="syzkaller188337" path="/root/syzkaller188337458" 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 RTNETLINK answers: Operation not supported [ 28.881861] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument executing program [ 29.216734] [ 29.218401] ===================================== [ 29.223226] WARNING: bad unlock balance detected! [ 29.228056] 4.16.0-rc2+ #234 Not tainted [ 29.232097] ------------------------------------- [ 29.236910] kworker/0:2/1830 is trying to release lock (rcu_read_lock_bh) at: [ 29.244169] [] hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 29.251152] but there are no more locks to release! [ 29.256139] [ 29.256139] other info that might help us debug this: [ 29.262778] 5 locks held by kworker/0:2/1830: [ 29.267242] #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<000000009257fd38>] process_one_work+0xaaf/0x1af0 [ 29.278064] #1: ((work_completion)(&(&ifa->dad_work)->work)){+.+.}, at: [<00000000fb04a1b3>] process_one_work+0xb01/0x1af0 [ 29.289401] #2: (rtnl_mutex){+.+.}, at: [<00000000d21c0050>] rtnl_lock+0x17/0x20 [ 29.297089] #3: (rcu_read_lock){....}, at: [<00000000dcb7ed4e>] ndisc_send_skb+0x826/0x1370 [ 29.305764] #4: (rcu_read_lock){....}, at: [<00000000498b1d3d>] nf_hook.constprop.27+0x0/0x830 [ 29.314668] [ 29.314668] stack backtrace: [ 29.319151] CPU: 0 PID: 1830 Comm: kworker/0:2 Not tainted 4.16.0-rc2+ #234 [ 29.326222] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.335559] Workqueue: ipv6_addrconf addrconf_dad_work [ 29.340807] Call Trace: [ 29.343369] dump_stack+0x194/0x257 [ 29.346970] ? arch_local_irq_restore+0x53/0x53 [ 29.351618] ? hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 29.357043] print_unlock_imbalance_bug+0x12f/0x140 [ 29.362034] lock_release+0x6fe/0xa40 [ 29.365811] ? hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 29.371236] ? lock_downgrade+0x980/0x980 [ 29.375358] ? lock_release+0xa40/0xa40 [ 29.379305] ? __raw_spin_lock_init+0x1c/0x100 [ 29.383860] ? do_raw_spin_trylock+0x190/0x190 [ 29.388429] hashlimit_mt_common.isra.10+0x1c08/0x2610 [ 29.393684] ? dsthash_find+0x5b0/0x5b0 [ 29.397633] ? __lock_acquire+0x664/0x3e00 [ 29.401843] ? ret_from_fork+0x3a/0x50 [ 29.405713] ? print_irqtrace_events+0x270/0x270 [ 29.410447] ? __unwind_start+0x169/0x330 [ 29.414574] hashlimit_mt+0x78/0x90 [ 29.418175] ? hashlimit_mt+0x78/0x90 [ 29.422736] ip6t_do_table+0x98d/0x1a30 [ 29.426694] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 29.431860] ? ip6t_error+0x60/0x60 [ 29.435462] ? check_noncircular+0x20/0x20 [ 29.439671] ? lock_acquire+0x1d5/0x580 [ 29.443617] ? lock_acquire+0x1d5/0x580 [ 29.447566] ? pndisc_destructor+0x340/0x340 [ 29.451952] ? lock_release+0xa40/0xa40 [ 29.455903] ip6table_raw_hook+0x65/0x80 [ 29.459939] nf_hook_slow+0xba/0x1a0 [ 29.463639] nf_hook.constprop.27+0x3f6/0x830 [ 29.468108] ? pndisc_destructor+0x340/0x340 [ 29.472489] ? find_held_lock+0x35/0x1d0 [ 29.476525] ? lock_acquire+0x1d5/0x580 [ 29.480472] ? lock_acquire+0x1d5/0x580 [ 29.484420] ? ndisc_send_skb+0x826/0x1370 [ 29.488628] ? lock_downgrade+0x980/0x980 [ 29.492750] ? lock_release+0xa40/0xa40 [ 29.496703] ? ndisc_error_report+0x180/0x180 [ 29.501174] ndisc_send_skb+0xa51/0x1370 [ 29.505212] ? nf_hook.constprop.27+0x830/0x830 [ 29.509855] ? check_noncircular+0x20/0x20 [ 29.514069] ? refcount_add_not_zero+0x133/0x200 [ 29.518799] ? refcount_dec_if_one+0x20/0x20 [ 29.523183] ? print_irqtrace_events+0x270/0x270 [ 29.527930] ndisc_send_ns+0x38a/0x870 [ 29.531794] ? ndisc_netdev_event+0x4a0/0x4a0 [ 29.536284] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.541290] ? addrconf_dad_work+0xa5e/0x1320 [ 29.545764] addrconf_dad_work+0xb9e/0x1320 [ 29.550060] ? addrconf_dad_work+0xb9e/0x1320 [ 29.554539] ? addrconf_ifdown+0x14f0/0x14f0 [ 29.558925] ? __lock_is_held+0xb6/0x140 [ 29.562976] process_one_work+0xbbf/0x1af0 [ 29.567187] ? process_one_work+0xbbf/0x1af0 [ 29.571572] ? pwq_dec_nr_in_flight+0x450/0x450 [ 29.576220] ? __schedule+0x90d/0x2070 [ 29.580089] ? __lock_acquire+0x664/0x3e00 [ 29.584302] ? __lock_is_held+0xb6/0x140 [ 29.588339] ? check_noncircular+0x20/0x20 [ 29.592559] ? check_noncircular+0x20/0x20 [ 29.596773] ? lock_acquire+0x1d5/0x580 [ 29.600722] ? lock_acquire+0x1d5/0x580 [ 29.604673] ? worker_thread+0x4a3/0x1990 [ 29.608796] ? lock_downgrade+0x980/0x980 [ 29.612919] ? lock_release+0xa40/0xa40 [ 29.616881] ? retint_kernel+0x10/0x10 [ 29.620755] ? do_raw_spin_trylock+0x190/0x190 [ 29.625318] worker_thread+0x223/0x1990 [ 29.629299] ? finish_task_switch+0x1c0/0x860 [ 29.633784] ? process_one_work+0x1af0/0x1af0 [ 29.638254] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.643249] ? trace_hardirqs_on+0xd/0x10 [ 29.647376] ? mmdrop+0x18/0x30 [ 29.650630] ? finish_task_switch+0x279/0x860 [ 29.655100] ? copy_overflow+0x20/0x20 [ 29.658967] ? __schedule+0x90d/0x2070 [ 29.662831] ? check_noncircular+0x20/0x20 [ 29.667040] ? do_raw_spin_trylock+0x190/0x190 [ 29.671599] ? find_held_lock+0x35/0x1d0 [ 29.675638] ? find_held_lock+0x35/0x1d0 [ 29.679686] ? complete+0x62/0x80 [ 29.683114] ? __schedule+0x2070/0x2070 [ 29.687072] ? do_wait_intr_irq+0x3e0/0x3e0 [ 29.691368] ? __lockdep_init_map+0xe4/0x650 [ 29.695751] ? do_raw_spin_trylock+0x190/0x190 [ 29.700310] ? lockdep_init_map+0x9/0x10 [ 29.704345] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 29.709422] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.714413] ? trace_hardirqs_on+0xd/0x10 [ 29