[....] Starting enhanced syslogd: rsyslogd[ 15.730961] audit: type=1400 audit(1519202556.552:5): avc: denied { syslog } for pid=3969 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: [ 18.769057] audit: type=1400 audit(1519202559.590:6): avc: denied { map } for pid=4108 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 '10.128.15.208' (ECDSA) to the list of known hosts. [ 31.926221] audit: type=1400 audit(1519202572.748:7): avc: denied { map } for pid=4124 comm="syzkaller434684" path="/root/syzkaller434684387" 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 [ 31.935239] IPVS: ftp: loaded support on port[0] = 21 net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 [ 31.952173] audit: type=1400 audit(1519202572.748:8): avc: denied { sys_admin } for pid=4124 comm="syzkaller434684" capability=21 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 [ 31.981787] audit: type=1400 audit(1519202572.780:9): avc: denied { net_admin } for pid=4125 comm="syzkaller434684" capability=12 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported [ 32.149705] 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 [ 32.453391] audit: type=1400 audit(1519202573.275:10): avc: denied { sys_chroot } for pid=4125 comm="syzkaller434684" capability=18 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 [ 32.456240] [ 32.478073] audit: type=1400 audit(1519202573.276:11): avc: denied { net_raw } for pid=4125 comm="syzkaller434684" capability=13 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 [ 32.479589] ===================================== [ 32.479590] WARNING: bad unlock balance detected! [ 32.479594] 4.16.0-rc2+ #323 Not tainted [ 32.479595] ------------------------------------- [ 32.479597] syzkaller434684/4125 is trying to release lock (rcu_read_lock_bh) at: [ 32.529903] [] hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 32.536878] but there are no more locks to release! [ 32.541859] [ 32.541859] other info that might help us debug this: [ 32.548493] 2 locks held by syzkaller434684/4125: [ 32.553298] #0: (rcu_read_lock){....}, at: [<00000000b454c4d4>] netif_receive_skb_internal+0xa2/0x670 [ 32.562801] #1: (rcu_read_lock){....}, at: [<000000001ecf1515>] ipv6_rcv+0x1446/0x1fa0 [ 32.571002] [ 32.571002] stack backtrace: [ 32.575468] CPU: 0 PID: 4125 Comm: syzkaller434684 Not tainted 4.16.0-rc2+ #323 [ 32.582879] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.592198] Call Trace: [ 32.594756] dump_stack+0x194/0x257 [ 32.598356] ? arch_local_irq_restore+0x53/0x53 [ 32.602994] ? hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 32.608412] print_unlock_imbalance_bug+0x12f/0x140 [ 32.613393] lock_release+0x6fe/0xa40 [ 32.617160] ? hashlimit_mt_common.isra.10+0x1beb/0x2610 [ 32.622577] ? lock_downgrade+0x980/0x980 [ 32.626692] ? lock_release+0xa40/0xa40 [ 32.630630] ? __raw_spin_lock_init+0x1c/0x100 [ 32.635178] ? do_raw_spin_trylock+0x190/0x190 [ 32.639728] hashlimit_mt_common.isra.10+0x1c08/0x2610 [ 32.644971] ? dsthash_find+0x5b0/0x5b0 [ 32.648910] ? __lock_acquire+0x664/0x3e00 [ 32.653121] ? __lock_acquire+0x664/0x3e00 [ 32.657322] ? lockdep_on+0x50/0x50 [ 32.660921] ? __lock_acquire+0x664/0x3e00 [ 32.665123] hashlimit_mt+0x78/0x90 [ 32.668715] ? hashlimit_mt+0x78/0x90 [ 32.672487] ip6t_do_table+0x98d/0x1a30 [ 32.676429] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 32.681585] ? check_noncircular+0x20/0x20 [ 32.685787] ? ip6t_error+0x60/0x60 [ 32.689380] ? find_held_lock+0x35/0x1d0 [ 32.693410] ? check_noncircular+0x20/0x20 [ 32.697613] ? lock_acquire+0x1d5/0x580 [ 32.701553] ? lock_acquire+0x1d5/0x580 [ 32.705497] ? ipv6_rcv+0x1446/0x1fa0 [ 32.709277] ? lock_release+0xa40/0xa40 [ 32.713218] ip6table_raw_hook+0x65/0x80 [ 32.717245] nf_hook_slow+0xba/0x1a0 [ 32.720925] ipv6_rcv+0x1687/0x1fa0 [ 32.724528] ? ip6_rcv_finish+0x8c0/0x8c0 [ 32.728642] ? lock_downgrade+0x980/0x980 [ 32.732757] ? lock_release+0xa40/0xa40 [ 32.736697] ? is_bpf_text_address+0xa4/0x120 [ 32.741162] ? ip6_input+0x560/0x560 [ 32.744840] ? ip6_rcv_finish+0x8c0/0x8c0 [ 32.748954] __netif_receive_skb_core+0x1a41/0x3460 [ 32.753935] ? nf_ingress+0x9f0/0x9f0 [ 32.757702] ? __skb_flow_dissect+0x4ce/0x3f00 [ 32.762252] ? SyS_writev+0x27/0x30 [ 32.765848] ? do_syscall_64+0x280/0x940 [ 32.769876] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 32.775031] ? __skb_flow_get_ports+0x420/0x420 [ 32.779667] ? __skb_flow_get_ports+0x420/0x420 [ 32.784301] ? check_noncircular+0x20/0x20 [ 32.788501] ? __lock_is_held+0xb6/0x140 [ 32.792528] ? print_irqtrace_events+0x270/0x270 [ 32.797252] ? find_held_lock+0x35/0x1d0 [ 32.801281] ? netif_receive_skb_internal+0x1d7/0x670 [ 32.806438] ? lock_downgrade+0x980/0x980 [ 32.810554] ? pvclock_read_flags+0x160/0x160 [ 32.815019] ? lock_acquire+0x1d5/0x580 [ 32.818958] ? lock_acquire+0x1d5/0x580 [ 32.822907] ? netif_receive_skb_internal+0xa2/0x670 [ 32.827978] ? ktime_get_with_offset+0x2c1/0x420 [ 32.832703] ? lock_release+0xa40/0xa40 [ 32.836646] ? do_gettimeofday+0x190/0x190 [ 32.840848] ? tun_build_skb.isra.50+0x397/0x1850 [ 32.845656] __netif_receive_skb+0x2c/0x1b0 [ 32.849944] ? __netif_receive_skb+0x2c/0x1b0 [ 32.854405] netif_receive_skb_internal+0x10b/0x670 [ 32.859388] ? dev_cpu_dead+0xb00/0xb00 [ 32.863331] ? rcu_pm_notify+0xc0/0xc0 [ 32.867189] netif_receive_skb+0xae/0x390 [ 32.871303] ? netif_receive_skb_internal+0x670/0x670 [ 32.876458] ? find_held_lock+0x35/0x1d0 [ 32.880489] ? tun_rx_batched.isra.52+0x5c4/0x870 [ 32.885312] tun_rx_batched.isra.52+0x5ee/0x870 [ 32.889947] ? tun_sock_write_space+0x370/0x370 [ 32.894586] tun_get_user+0x25a5/0x3810 [ 32.898529] ? kernel_text_address+0x102/0x140 [ 32.903079] ? check_noncircular+0x20/0x20 [ 32.907284] ? tun_build_skb.isra.50+0x1850/0x1850 [ 32.912189] ? xt_table_unlock+0x52/0x60 [ 32.916216] ? lock_downgrade+0x980/0x980 [ 32.920329] ? rawv6_setsockopt+0x4a/0xf0 [ 32.924444] ? SyS_setsockopt+0x189/0x360 [ 32.928559] ? do_syscall_64+0x280/0x940 [ 32.932587] ? tun_get+0x1ab/0x2e0 [ 32.936098] ? lock_release+0xa40/0xa40 [ 32.940041] ? __lock_is_held+0xb6/0x140 [ 32.944071] ? tun_get+0x1d4/0x2e0 [ 32.947578] ? tun_do_read+0x26c0/0x26c0 [ 32.951610] ? __check_object_size+0x8b/0x530 [ 32.956082] ? rcu_note_context_switch+0x710/0x710 [ 32.960982] tun_chr_write_iter+0xbd/0x1c0 [ 32.965196] do_iter_readv_writev+0x55c/0x830 [ 32.969661] ? vfs_dedupe_file_range+0x8f0/0x8f0 [ 32.974384] ? rw_verify_area+0xe5/0x2b0 [ 32.978411] do_iter_write+0x154/0x540 [ 32.982263] ? dup_iter+0x260/0x260 [ 32.985856] ? do_ip6t_set_ctl+0x104/0x5f0 [ 32.990060] vfs_writev+0x18a/0x340 [ 32.993652] ? vfs_iter_write+0xb0/0xb0 [ 32.997594] ? nf_setsockopt+0x93/0xc0 [ 33.001453] ? __fdget_pos+0x130/0x190 [ 33.005306] ? __fdget_raw+0x20/0x20 [ 33.008986] ? sock_common_setsockopt+0x95/0xd0 [ 33.013622] do_writev+0xfc/0x2a0 [ 33.017039] ? do_writev+0xfc/0x2a0 [ 33.020641] ? vfs_writev+0x340/0x340 [ 33.024410] ? mm_fault_error+0x2c0/0x2c0 [ 33.028527] ? move_addr_to_kernel+0x60/0x60 [ 33.032903] ? SyS_readv+0x30/0x30 [ 33.036407] SyS_writev+0x27/0x30 [ 33.039831] do_syscall_64+0x280/0x940 [ 33.043687] ? __do_page_fault+0xc90/0xc90 [ 33.047888] ? mmdrop+0x18/0x30 [ 33.051135] ? finish_task_switch+0x279/0x860 [ 33.055597] ? syscall_return_slowpath+0x550/0x550 [ 33.060495] ? syscall_return_slowpath+0x2ac/0x550 [ 33.065397] ? prepare_exit_to_usermode+0x350/0x350 [ 33.070380] ? entry_SYSCALL_64_after_hwframe+0x52/0xb7 [ 33.075712] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.080522] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 33.085677] RIP: 0033:0x446850 [ 33.088833] RSP: 002b:00000000007efdf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 [ 33.096504] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000446850 [ 33.103741] RDX: 000000000