[....] Starting enhanced syslogd: rsyslogd[ 16.156754] audit: type=1400 audit(1519202552.644:5): avc: denied { syslog } for pid=4006 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 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. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.935817] audit: type=1400 audit(1519202558.423:6): avc: denied { map } for pid=4146 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 '10.128.15.214' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 [ 28.231073] audit: type=1400 audit(1519202564.718:7): avc: denied { map } for pid=4160 comm="syzkaller920382" path="/root/syzkaller920382134" 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 [ 28.612494] 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 [ 28.945745] [ 28.947409] ===================================== [ 28.952231] WARNING: bad unlock balance detected! [ 28.957057] 4.16.0-rc2+ #235 Not tainted [ 28.961100] ------------------------------------- [ 28.965924] kworker/0:1/23 is trying to release lock (rcu_read_lock_bh) at: [ 28.973023] [] hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 28.980019] but there are no more locks to release! [ 28.985013] [ 28.985013] other info that might help us debug this: [ 28.991658] 5 locks held by kworker/0:1/23: [ 28.995944] #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<00000000c6b5daeb>] process_one_work+0xaaf/0x1af0 [ 29.006758] #1: ((work_completion)(&(&ifa->dad_work)->work)){+.+.}, at: [<00000000de3cefe4>] process_one_work+0xb01/0x1af0 [ 29.018085] #2: (rtnl_mutex){+.+.}, at: [<00000000e2dd0976>] rtnl_lock+0x17/0x20 [ 29.025767] #3: (rcu_read_lock){....}, at: [<00000000289dfaac>] ndisc_send_skb+0x826/0x1370 [ 29.034402] #4: (rcu_read_lock){....}, at: [<000000009d5e71d9>] nf_hook.constprop.27+0x0/0x830 [ 29.043298] [ 29.043298] stack backtrace: [ 29.047765] CPU: 0 PID: 23 Comm: kworker/0:1 Not tainted 4.16.0-rc2+ #235 [ 29.054654] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.063981] Workqueue: ipv6_addrconf addrconf_dad_work [ 29.069225] Call Trace: [ 29.071784] dump_stack+0x194/0x257 [ 29.075381] ? arch_local_irq_restore+0x53/0x53 [ 29.080026] ? hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 29.085449] print_unlock_imbalance_bug+0x12f/0x140 [ 29.090433] lock_release+0x6fe/0xa40 [ 29.094201] ? hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 29.099619] ? lock_downgrade+0x980/0x980 [ 29.103734] ? lock_release+0xa40/0xa40 [ 29.107678] ? __raw_spin_lock_init+0x1c/0x100 [ 29.112227] ? do_raw_spin_trylock+0x190/0x190 [ 29.116780] hashlimit_mt_common.isra.10+0x1c08/0x2610 [ 29.122035] ? dsthash_find+0x5b0/0x5b0 [ 29.125986] ? __lock_acquire+0x664/0x3e00 [ 29.130192] ? ret_from_fork+0x3a/0x50 [ 29.134051] ? print_irqtrace_events+0x270/0x270 [ 29.138780] ? __unwind_start+0x169/0x330 [ 29.142897] hashlimit_mt+0x78/0x90 [ 29.146501] ? hashlimit_mt+0x78/0x90 [ 29.150276] ip6t_do_table+0x98d/0x1a30 [ 29.154221] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 29.159384] ? ip6t_error+0x60/0x60 [ 29.162983] ? check_noncircular+0x20/0x20 [ 29.167190] ? lock_acquire+0x1d5/0x580 [ 29.171131] ? lock_acquire+0x1d5/0x580 [ 29.175074] ? pndisc_destructor+0x340/0x340 [ 29.179452] ? lock_release+0xa40/0xa40 [ 29.183396] ip6table_raw_hook+0x65/0x80 [ 29.187426] nf_hook_slow+0xba/0x1a0 [ 29.191108] nf_hook.constprop.27+0x3f6/0x830 [ 29.195573] ? pndisc_destructor+0x340/0x340 [ 29.199952] ? find_held_lock+0x35/0x1d0 [ 29.203982] ? lock_acquire+0x1d5/0x580 [ 29.207934] ? lock_acquire+0x1d5/0x580 [ 29.211877] ? ndisc_send_skb+0x826/0x1370 [ 29.216088] ? lock_downgrade+0x980/0x980 [ 29.220211] ? lock_release+0xa40/0xa40 [ 29.224160] ? ndisc_error_report+0x180/0x180 [ 29.228623] ndisc_send_skb+0xa51/0x1370 [ 29.232655] ? nf_hook.constprop.27+0x830/0x830 [ 29.237291] ? check_noncircular+0x20/0x20 [ 29.241494] ? refcount_add_not_zero+0x133/0x200 [ 29.246221] ? refcount_dec_if_one+0x20/0x20 [ 29.250597] ? print_irqtrace_events+0x270/0x270 [ 29.255324] ndisc_send_ns+0x38a/0x870 [ 29.259180] ? ndisc_netdev_event+0x4a0/0x4a0 [ 29.263642] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.268625] ? addrconf_dad_work+0xa5e/0x1320 [ 29.273089] addrconf_dad_work+0xb9e/0x1320 [ 29.277378] ? addrconf_dad_work+0xb9e/0x1320 [ 29.281847] ? addrconf_ifdown+0x14f0/0x14f0 [ 29.286223] ? __lock_is_held+0xb6/0x140 [ 29.290252] process_one_work+0xbbf/0x1af0 [ 29.294454] ? process_one_work+0xbbf/0x1af0 [ 29.298830] ? pwq_dec_nr_in_flight+0x450/0x450 [ 29.303470] ? __schedule+0x90d/0x2070 [ 29.307326] ? __lock_acquire+0x664/0x3e00 [ 29.311529] ? check_noncircular+0x20/0x20 [ 29.315733] ? check_noncircular+0x20/0x20 [ 29.319937] ? lock_acquire+0x1d5/0x580 [ 29.323880] ? lock_acquire+0x1d5/0x580 [ 29.327823] ? worker_thread+0x4a3/0x1990 [ 29.331938] ? lock_downgrade+0x980/0x980 [ 29.336055] ? lock_release+0xa40/0xa40 [ 29.339998] ? retint_kernel+0x10/0x10 [ 29.343860] ? do_raw_spin_trylock+0x190/0x190 [ 29.348412] worker_thread+0x223/0x1990 [ 29.352359] ? finish_task_switch+0x1c0/0x860 [ 29.356828] ? process_one_work+0x1af0/0x1af0 [ 29.361289] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.366274] ? trace_hardirqs_on+0xd/0x10 [ 29.370388] ? mmdrop+0x18/0x30 [ 29.373634] ? finish_task_switch+0x279/0x860 [ 29.378095] ? copy_overflow+0x20/0x20 [ 29.381951] ? __schedule+0x90d/0x2070 [ 29.385807] ? check_noncircular+0x20/0x20 [ 29.390010] ? find_held_lock+0x35/0x1d0 [ 29.394052] ? find_held_lock+0x35/0x1d0 [ 29.398080] ? find_held_lock+0x35/0x1d0 [ 29.402111] ? complete+0x62/0x80 [ 29.405533] ? __schedule+0x2070/0x2070 [ 29.409478] ? do_wait_intr_irq+0x3e0/0x3e0 [ 29.413768] ? __lockdep_init_map+0xe4/0x650 [ 29.418142] ? do_raw_spin_trylock+0x190/0x190 [ 29.422692] ? lockdep_init_map+0x9/0x10 [ 29.426720] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 29.431792] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.436778] ? trace_hardirqs_on+0xd/0x10 [ 29.440905] ? __kthread_parkme+0x175/0x240 [ 29.445195] kthread+0x33c/0