[....] Starting enhanced syslogd: rsyslogd[ 16.739166] audit: type=1400 audit(1519160256.358:5): avc: denied { syslog } for pid=4031 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: [ 22.845689] audit: type=1400 audit(1519160262.464:6): avc: denied { map } for pid=4169 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 '10.128.0.54' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 [ 29.167164] audit: type=1400 audit(1519160268.785:7): avc: denied { map } for pid=4183 comm="syzkaller381941" path="/root/syzkaller381941542" 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 [ 29.556570] 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 [ 29.930210] [ 29.931879] ===================================== [ 29.936707] WARNING: bad unlock balance detected! [ 29.941538] 4.16.0-rc2+ #234 Not tainted [ 29.945583] ------------------------------------- [ 29.950403] kworker/0:1/24 is trying to release lock (rcu_read_lock_bh) at: [ 29.957500] [] hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 29.964492] but there are no more locks to release! [ 29.969489] [ 29.969489] other info that might help us debug this: [ 29.976143] 5 locks held by kworker/0:1/24: [ 29.980432] #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<000000004ea0d2f7>] process_one_work+0xaaf/0x1af0 [ 29.991244] #1: ((work_completion)(&(&ifa->dad_work)->work)){+.+.}, at: [<000000005dbc46b3>] process_one_work+0xb01/0x1af0 [ 30.002571] #2: (rtnl_mutex){+.+.}, at: [<00000000d0b61eb3>] rtnl_lock+0x17/0x20 [ 30.010259] #3: (rcu_read_lock){....}, at: [<000000000cb2ff51>] ndisc_send_skb+0x826/0x1370 [ 30.018894] #4: (rcu_read_lock){....}, at: [<00000000b581e7f3>] nf_hook.constprop.27+0x0/0x830 [ 30.027789] [ 30.027789] stack backtrace: [ 30.032254] CPU: 0 PID: 24 Comm: kworker/0:1 Not tainted 4.16.0-rc2+ #234 [ 30.039144] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.048477] Workqueue: ipv6_addrconf addrconf_dad_work [ 30.053721] Call Trace: [ 30.056278] dump_stack+0x194/0x257 [ 30.059875] ? arch_local_irq_restore+0x53/0x53 [ 30.064516] ? hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 30.069935] print_unlock_imbalance_bug+0x12f/0x140 [ 30.074932] lock_release+0x6fe/0xa40 [ 30.078708] ? hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 30.084128] ? lock_downgrade+0x980/0x980 [ 30.088243] ? lock_release+0xa40/0xa40 [ 30.092184] ? __raw_spin_lock_init+0x1c/0x100 [ 30.096746] ? do_raw_spin_trylock+0x190/0x190 [ 30.101300] hashlimit_mt_common.isra.10+0x1c08/0x2610 [ 30.106548] ? dsthash_find+0x5b0/0x5b0 [ 30.110491] ? __lock_acquire+0x664/0x3e00 [ 30.114701] ? ret_from_fork+0x3a/0x50 [ 30.118569] ? print_irqtrace_events+0x270/0x270 [ 30.123301] ? __unwind_start+0x169/0x330 [ 30.127418] hashlimit_mt+0x78/0x90 [ 30.131015] ? hashlimit_mt+0x78/0x90 [ 30.134790] ip6t_do_table+0x98d/0x1a30 [ 30.138734] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 30.143893] ? ip6t_error+0x60/0x60 [ 30.147492] ? check_noncircular+0x20/0x20 [ 30.151694] ? lock_acquire+0x1d5/0x580 [ 30.155636] ? lock_acquire+0x1d5/0x580 [ 30.159585] ? pndisc_destructor+0x340/0x340 [ 30.163963] ? lock_release+0xa40/0xa40 [ 30.167913] ip6table_raw_hook+0x65/0x80 [ 30.171947] nf_hook_slow+0xba/0x1a0 [ 30.175630] nf_hook.constprop.27+0x3f6/0x830 [ 30.180092] ? pndisc_destructor+0x340/0x340 [ 30.184469] ? find_held_lock+0x35/0x1d0 [ 30.188499] ? lock_acquire+0x1d5/0x580 [ 30.192439] ? lock_acquire+0x1d5/0x580 [ 30.196379] ? ndisc_send_skb+0x826/0x1370 [ 30.200582] ? lock_downgrade+0x980/0x980 [ 30.204697] ? lock_release+0xa40/0xa40 [ 30.208641] ? ndisc_error_report+0x180/0x180 [ 30.213106] ndisc_send_skb+0xa51/0x1370 [ 30.217136] ? nf_hook.constprop.27+0x830/0x830 [ 30.221774] ? check_noncircular+0x20/0x20 [ 30.225978] ? refcount_add_not_zero+0x133/0x200 [ 30.230701] ? refcount_dec_if_one+0x20/0x20 [ 30.235078] ? print_irqtrace_events+0x270/0x270 [ 30.239806] ndisc_send_ns+0x38a/0x870 [ 30.243662] ? ndisc_netdev_event+0x4a0/0x4a0 [ 30.248128] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.253115] ? addrconf_dad_work+0xa5e/0x1320 [ 30.257581] addrconf_dad_work+0xb9e/0x1320 [ 30.261876] ? addrconf_dad_work+0xb9e/0x1320 [ 30.266340] ? addrconf_ifdown+0x14f0/0x14f0 [ 30.270715] ? __lock_is_held+0xb6/0x140 [ 30.274747] process_one_work+0xbbf/0x1af0 [ 30.278948] ? process_one_work+0xbbf/0x1af0 [ 30.283329] ? pwq_dec_nr_in_flight+0x450/0x450 [ 30.287977] ? __schedule+0x90d/0x2070 [ 30.291836] ? __lock_acquire+0x664/0x3e00 [ 30.296040] ? retint_kernel+0x10/0x10 [ 30.299895] ? check_noncircular+0x20/0x20 [ 30.304102] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 30.308831] ? lock_acquire+0x1d5/0x580 [ 30.312773] ? lock_acquire+0x1d5/0x580 [ 30.316714] ? worker_thread+0x4a3/0x1990 [ 30.320829] ? lock_downgrade+0x980/0x980 [ 30.324953] ? lock_release+0xa40/0xa40 [ 30.328897] ? check_noncircular+0x20/0x20 [ 30.333103] ? do_raw_spin_trylock+0x190/0x190 [ 30.337678] worker_thread+0x223/0x1990 [ 30.341622] ? finish_task_switch+0x1c0/0x860 [ 30.346091] ? process_one_work+0x1af0/0x1af0 [ 30.350555] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.355540] ? trace_hardirqs_on+0xd/0x10 [ 30.359657] ? mmdrop+0x18/0x30 [ 30.362906] ? finish_task_switch+0x279/0x860 [ 30.367372] ? copy_overflow+0x20/0x20 [ 30.371232] ? __schedule+0x90d/0x2070 [ 30.375091] ? check_noncircular+0x20/0x20 [ 30.379297] ? find_held_lock+0x35/0x1d0 [ 30.383325] ? find_held_lock+0x35/0x1d0 [ 30.387357] ? find_held_lock+0x35/0x1d0 [ 30.391389] ? complete+0x62/0x80 [ 30.394813] ? __schedule+0x2070/0x2070 [ 30.398757] ? do_wait_intr_irq+0x3e0/0x3e0 [ 30.403062] ? __lockdep_init_map+0xe4/0x650 [ 30.407437] ? do_raw_spin_trylock+0x190/0x190 [ 30.411987] ? lockdep_init_map+0x9/0x10 [ 30.416029] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 30.421100] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.426083] ? trace_hardirqs_on+0xd/0x10 [ 30.430202] ? __kthrea