[....] Starting enhanced syslogd: rsyslogd[ 15.943162] audit: type=1400 audit(1519139860.706:5): avc: denied { syslog } for pid=3864 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: [ 22.204584] audit: type=1400 audit(1519139866.967:6): avc: denied { map } for pid=4003 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 '10.128.15.205' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 [ 28.535310] audit: type=1400 audit(1519139873.298:7): avc: denied { map } for pid=4017 comm="syzkaller065665" path="/root/syzkaller065665659" 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 [ 28.929528] 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 [ 29.272519] [ 29.274206] ===================================== [ 29.279039] WARNING: bad unlock balance detected! [ 29.283859] 4.16.0-rc2+ #234 Not tainted [ 29.287894] ------------------------------------- [ 29.292705] kworker/1:1/23 is trying to release lock (rcu_read_lock_bh) at: [ 29.299792] [] hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 29.306789] but there are no more locks to release! [ 29.311778] [ 29.311778] other info that might help us debug this: [ 29.318433] 5 locks held by kworker/1:1/23: [ 29.322729] #0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<00000000ff4ad303>] process_one_work+0xaaf/0x1af0 [ 29.333550] #1: ((work_completion)(&(&ifa->dad_work)->work)){+.+.}, at: [<0000000063e7f7d9>] process_one_work+0xb01/0x1af0 [ 29.344900] #2: (rtnl_mutex){+.+.}, at: [<000000009508579e>] rtnl_lock+0x17/0x20 [ 29.352595] #3: (rcu_read_lock){....}, at: [<000000003b1a8436>] ndisc_send_skb+0x826/0x1370 [ 29.361256] #4: (rcu_read_lock){....}, at: [<0000000059d63c4a>] nf_hook.constprop.27+0x0/0x830 [ 29.370180] [ 29.370180] stack backtrace: [ 29.374657] CPU: 1 PID: 23 Comm: kworker/1:1 Not tainted 4.16.0-rc2+ #234 [ 29.381566] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.390910] Workqueue: ipv6_addrconf addrconf_dad_work [ 29.396161] Call Trace: [ 29.398731] dump_stack+0x194/0x257 [ 29.402335] ? arch_local_irq_restore+0x53/0x53 [ 29.406986] ? hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 29.412412] print_unlock_imbalance_bug+0x12f/0x140 [ 29.417409] lock_release+0x6fe/0xa40 [ 29.421189] ? hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 29.426614] ? lock_downgrade+0x980/0x980 [ 29.430743] ? lock_release+0xa40/0xa40 [ 29.434696] ? __raw_spin_lock_init+0x1c/0x100 [ 29.439250] ? do_raw_spin_trylock+0x190/0x190 [ 29.443816] hashlimit_mt_common.isra.10+0x1c08/0x2610 [ 29.449078] ? dsthash_find+0x5b0/0x5b0 [ 29.453027] ? __lock_acquire+0x664/0x3e00 [ 29.457241] ? ret_from_fork+0x3a/0x50 [ 29.461113] ? print_irqtrace_events+0x270/0x270 [ 29.465851] ? __unwind_start+0x169/0x330 [ 29.469981] hashlimit_mt+0x78/0x90 [ 29.473584] ? hashlimit_mt+0x78/0x90 [ 29.477364] ip6t_do_table+0x98d/0x1a30 [ 29.481312] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 29.486485] ? ip6t_error+0x60/0x60 [ 29.490091] ? check_noncircular+0x20/0x20 [ 29.494304] ? lock_acquire+0x1d5/0x580 [ 29.498270] ? lock_acquire+0x1d5/0x580 [ 29.502216] ? pndisc_destructor+0x340/0x340 [ 29.506606] ? lock_release+0xa40/0xa40 [ 29.510562] ip6table_raw_hook+0x65/0x80 [ 29.514602] nf_hook_slow+0xba/0x1a0 [ 29.518298] nf_hook.constprop.27+0x3f6/0x830 [ 29.522767] ? pndisc_destructor+0x340/0x340 [ 29.527151] ? find_held_lock+0x35/0x1d0 [ 29.531194] ? lock_acquire+0x1d5/0x580 [ 29.535144] ? lock_acquire+0x1d5/0x580 [ 29.539107] ? ndisc_send_skb+0x826/0x1370 [ 29.543320] ? lock_downgrade+0x980/0x980 [ 29.547447] ? lock_release+0xa40/0xa40 [ 29.551397] ? ndisc_error_report+0x180/0x180 [ 29.555873] ndisc_send_skb+0xa51/0x1370 [ 29.559917] ? nf_hook.constprop.27+0x830/0x830 [ 29.564565] ? check_noncircular+0x20/0x20 [ 29.569721] ? refcount_add_not_zero+0x133/0x200 [ 29.574459] ? refcount_dec_if_one+0x20/0x20 [ 29.578842] ? print_irqtrace_events+0x270/0x270 [ 29.583584] ndisc_send_ns+0x38a/0x870 [ 29.587453] ? ndisc_netdev_event+0x4a0/0x4a0 [ 29.591926] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.596921] ? addrconf_dad_work+0xa5e/0x1320 [ 29.601393] addrconf_dad_work+0xb9e/0x1320 [ 29.605693] ? addrconf_dad_work+0xb9e/0x1320 [ 29.610178] ? addrconf_ifdown+0x14f0/0x14f0 [ 29.614560] ? __lock_is_held+0xb6/0x140 [ 29.618605] process_one_work+0xbbf/0x1af0 [ 29.622818] ? process_one_work+0xbbf/0x1af0 [ 29.628081] ? pwq_dec_nr_in_flight+0x450/0x450 [ 29.632730] ? __schedule+0x90d/0x2070 [ 29.636613] ? __lock_acquire+0x664/0x3e00 [ 29.640829] ? check_noncircular+0x20/0x20 [ 29.645050] ? check_noncircular+0x20/0x20 [ 29.649266] ? lock_acquire+0x1d5/0x580 [ 29.653216] ? lock_acquire+0x1d5/0x580 [ 29.657170] ? worker_thread+0x4a3/0x1990 [ 29.661298] ? lock_downgrade+0x980/0x980 [ 29.665423] ? lock_release+0xa40/0xa40 [ 29.669377] ? check_noncircular+0x20/0x20 [ 29.673589] ? do_raw_spin_trylock+0x190/0x190 [ 29.678148] worker_thread+0x223/0x1990 [ 29.682100] ? finish_task_switch+0x1c0/0x860 [ 29.686581] ? process_one_work+0x1af0/0x1af0 [ 29.691059] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.696060] ? trace_hardirqs_on+0xd/0x10 [ 29.700193] ? mmdrop+0x18/0x30 [ 29.703450] ? finish_task_switch+0x279/0x860 [ 29.707946] ? copy_overflow+0x20/0x20 [ 29.711811] ? __schedule+0x90d/0x2070 [ 29.715674] ? check_noncircular+0x20/0x20 [ 29.719882] ? find_held_lock+0x35/0x1d0 [ 29.723925] ? find_held_lock+0x35/0x1d0 [ 29.727963] ? find_held_lock+0x35/0x1d0 [ 29.732007] ? complete+0x62/0x80 [ 29.735453] ? __schedule+0x2070/0x2070 [ 29.739405] ? do_wait_intr_irq+0x3e0/0x3e0 [ 29.743748] ? __lockdep_init_map+0xe4/0x650 [ 29.748131] ? do_raw_spin_trylock+0x190/0x190 [ 29.752692] ? lockdep_init_map+0x9/0x10 [ 29.756733] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 29.761810] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.766807] ? trace_hardirqs_on+0xd/0x10 [ 29.770933] ? __kthread_parkme+0x175/0x240