[....] Starting enhanced syslogd: rsyslogd[ 16.645611] audit: type=1400 audit(1519171328.237:5): avc: denied { syslog } for pid=4018 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 OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.979346] audit: type=1400 audit(1519171330.571:6): avc: denied { map } for pid=4157 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 '10.128.15.225' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 [ 25.324164] audit: type=1400 audit(1519171336.915:7): avc: denied { map } for pid=4170 comm="syzkaller496082" path="/root/syzkaller496082878" 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 [ 25.700587] 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 [ 26.036744] [ 26.038409] ===================================== [ 26.043232] WARNING: bad unlock balance detected! [ 26.048062] 4.16.0-rc2+ #235 Not tainted [ 26.052106] ------------------------------------- [ 26.056935] kworker/1:1/24 is trying to release lock (rcu_read_lock_bh) at: [ 26.064028] [] hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 26.071017] but there are no more locks to release! [ 26.076009] [ 26.076009] other info that might help us debug this: [ 26.082658] 5 locks held by kworker/1:1/24: [ 26.086947] #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<00000000f0ecc3c0>] process_one_work+0xaaf/0x1af0 [ 26.097759] #1: ((work_completion)(&(&ifa->dad_work)->work)){+.+.}, at: [<00000000e9ff7718>] process_one_work+0xb01/0x1af0 [ 26.109103] #2: (rtnl_mutex){+.+.}, at: [<00000000ccd405c8>] rtnl_lock+0x17/0x20 [ 26.116789] #3: (rcu_read_lock){....}, at: [<00000000e659e519>] ndisc_send_skb+0x826/0x1370 [ 26.125425] #4: (rcu_read_lock){....}, at: [<00000000bc0716a4>] nf_hook.constprop.27+0x0/0x830 [ 26.134320] [ 26.134320] stack backtrace: [ 26.138784] CPU: 1 PID: 24 Comm: kworker/1:1 Not tainted 4.16.0-rc2+ #235 [ 26.145674] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.155004] Workqueue: ipv6_addrconf addrconf_dad_work [ 26.160254] Call Trace: [ 26.162811] dump_stack+0x194/0x257 [ 26.166407] ? arch_local_irq_restore+0x53/0x53 [ 26.171047] ? hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 26.176471] print_unlock_imbalance_bug+0x12f/0x140 [ 26.181457] lock_release+0x6fe/0xa40 [ 26.185233] ? hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 26.190650] ? lock_downgrade+0x980/0x980 [ 26.194767] ? lock_release+0xa40/0xa40 [ 26.198710] ? __raw_spin_lock_init+0x1c/0x100 [ 26.203262] ? do_raw_spin_trylock+0x190/0x190 [ 26.207813] hashlimit_mt_common.isra.10+0x1c08/0x2610 [ 26.213062] ? dsthash_find+0x5b0/0x5b0 [ 26.217004] ? __lock_acquire+0x664/0x3e00 [ 26.221213] ? ret_from_fork+0x3a/0x50 [ 26.225071] ? print_irqtrace_events+0x270/0x270 [ 26.229797] ? __unwind_start+0x169/0x330 [ 26.233913] hashlimit_mt+0x78/0x90 [ 26.237509] ? hashlimit_mt+0x78/0x90 [ 26.241375] ip6t_do_table+0x98d/0x1a30 [ 26.245319] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 26.250480] ? ip6t_error+0x60/0x60 [ 26.254075] ? check_noncircular+0x20/0x20 [ 26.258277] ? lock_acquire+0x1d5/0x580 [ 26.262218] ? lock_acquire+0x1d5/0x580 [ 26.266162] ? pndisc_destructor+0x340/0x340 [ 26.270540] ? lock_release+0xa40/0xa40 [ 26.274488] ip6table_raw_hook+0x65/0x80 [ 26.278518] nf_hook_slow+0xba/0x1a0 [ 26.282203] nf_hook.constprop.27+0x3f6/0x830 [ 26.286676] ? pndisc_destructor+0x340/0x340 [ 26.291054] ? find_held_lock+0x35/0x1d0 [ 26.295087] ? lock_acquire+0x1d5/0x580 [ 26.299035] ? lock_acquire+0x1d5/0x580 [ 26.302983] ? ndisc_send_skb+0x826/0x1370 [ 26.307186] ? lock_downgrade+0x980/0x980 [ 26.311302] ? lock_release+0xa40/0xa40 [ 26.315245] ? ndisc_error_report+0x180/0x180 [ 26.319710] ndisc_send_skb+0xa51/0x1370 [ 26.323739] ? nf_hook.constprop.27+0x830/0x830 [ 26.328378] ? check_noncircular+0x20/0x20 [ 26.332582] ? refcount_add_not_zero+0x133/0x200 [ 26.337304] ? refcount_dec_if_one+0x20/0x20 [ 26.341681] ? print_irqtrace_events+0x270/0x270 [ 26.346410] ndisc_send_ns+0x38a/0x870 [ 26.350269] ? ndisc_netdev_event+0x4a0/0x4a0 [ 26.354732] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.359717] ? addrconf_dad_work+0xa5e/0x1320 [ 26.364184] addrconf_dad_work+0xb9e/0x1320 [ 26.368475] ? addrconf_dad_work+0xb9e/0x1320 [ 26.372939] ? addrconf_ifdown+0x14f0/0x14f0 [ 26.377320] ? __lock_is_held+0xb6/0x140 [ 26.381358] process_one_work+0xbbf/0x1af0 [ 26.385561] ? process_one_work+0xbbf/0x1af0 [ 26.389939] ? pwq_dec_nr_in_flight+0x450/0x450 [ 26.394577] ? __schedule+0x90d/0x2070 [ 26.398435] ? __lock_acquire+0x664/0x3e00 [ 26.402640] ? check_noncircular+0x20/0x20 [ 26.406848] ? check_noncircular+0x20/0x20 [ 26.411052] ? lock_acquire+0x1d5/0x580 [ 26.414994] ? lock_acquire+0x1d5/0x580 [ 26.418943] ? worker_thread+0x4a3/0x1990 [ 26.423062] ? lock_downgrade+0x980/0x980 [ 26.427186] ? lock_release+0xa40/0xa40 [ 26.431128] ? check_noncircular+0x20/0x20 [ 26.435334] ? do_raw_spin_trylock+0x190/0x190 [ 26.439887] worker_thread+0x223/0x1990 [ 26.443839] ? finish_task_switch+0x1c0/0x860 [ 26.448306] ? process_one_work+0x1af0/0x1af0 [ 26.453333] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.458325] ? trace_hardirqs_on+0xd/0x10 [ 26.462446] ? mmdrop+0x18/0x30 [ 26.465695] ? finish_task_switch+0x279/0x860 [ 26.470158] ? copy_overflow+0x20/0x20 [ 26.474025] ? __schedule+0x90d/0x2070 [ 26.477896] ? check_noncircular+0x20/0x20 [ 26.482282] ? find_held_lock+0x35/0x1d0 [ 26.486312] ? find_held_lock+0x35/0x1d0 [ 26.490345] ? find_held_lock+0x35/0x1d0 [ 26.494376] ? complete+0x62/0x80 [ 26.497800] ? __schedule+0x2070/0x2070 [ 26.501745] ? do_wait_intr_irq+0x3e0/0x3e0 [ 26.506038] ? __lockdep_init_map+0xe4/0x650 [ 26.510425] ? do_raw_spin_trylock+0x190/0x190 [ 26.514979] ? lockdep_init_map+0x9/0x10 [ 26.519018] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 26.524097] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.529083] ? trace_hardirqs_on+0xd/0x10 [ 26.533198] ? __kthread_parkme+0x175/0x240 [ 26.537488] k