[....] Starting enhanced syslogd: rsyslogd[   11.996578] audit: type=1400 audit(1517125738.351:5): avc:  denied  { syslog } for  pid=3524 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: [   17.623746] audit: type=1400 audit(1517125743.978:6): avc:  denied  { map } for  pid=3662 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 '10.128.15.218' (ECDSA) to the list of known hosts.
net.ipv6.conf.syz0.accept_dad = 0
net.ipv6.conf.syz0.router_solicitations = 0
[   31.499618] audit: type=1400 audit(1517125757.854:7): avc:  denied  { map } for  pid=3679 comm="syzkaller702888" path="/root/syzkaller702888279" 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
[   31.778641] 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
[   32.128202] ipt_CLUSTERIP: ipt_CLUSTERIP is deprecated and it will removed soon, use xt_cluster instead
[   32.140659] 
[   32.142307] ======================================================
[   32.148589] WARNING: possible circular locking dependency detected
[   32.154872] 4.15.0-rc9+ #212 Not tainted
[   32.158897] ------------------------------------------------------
[   32.165271] syzkaller702888/3679 is trying to acquire lock:
[   32.170945]  (rtnl_mutex){+.+.}, at: [<000000005bbe825a>] rtnl_lock+0x17/0x20
[   32.178197] 
[   32.178197] but task is already holding lock:
[   32.184131]  (&xt[i].mutex){+.+.}, at: [<00000000efadf980>] xt_find_table_lock+0x3e/0x3e0
[   32.192419] 
[   32.192419] which lock already depends on the new lock.
[   32.192419] 
[   32.200700] 
[   32.200700] the existing dependency chain (in reverse order) is:
[   32.208285] 
[   32.208285] -> #2 (&xt[i].mutex){+.+.}:
[   32.213720]        __mutex_lock+0x16f/0x1a80
[   32.218097]        mutex_lock_nested+0x16/0x20
[   32.222645]        xt_find_revision+0xc9/0x2b0
[   32.227193]        do_ip6t_get_ctl+0x963/0xaf0
[   32.231741]        nf_getsockopt+0x6a/0xc0
[   32.235941]        ipv6_getsockopt+0x1df/0x2e0
[   32.240490]        tcp_getsockopt+0x82/0xd0
[   32.244784]        sock_common_getsockopt+0x95/0xd0
[   32.249767]        SyS_getsockopt+0x178/0x340
[   32.254231]        entry_SYSCALL_64_fastpath+0x29/0xa0
[   32.259480] 
[   32.259480] -> #1 (sk_lock-AF_INET6){+.+.}:
[   32.265250]        lock_sock_nested+0xc2/0x110
[   32.269800]        do_ipv6_setsockopt.isra.8+0x3c5/0x39d0
[   32.275303]        ipv6_setsockopt+0xd7/0x150
[   32.279767]        sctp_setsockopt+0x2b6/0x61d0
[   32.284403]        sock_common_setsockopt+0x95/0xd0
[   32.289387]        SyS_setsockopt+0x189/0x360
[   32.293848]        entry_SYSCALL_64_fastpath+0x29/0xa0
[   32.299090] 
[   32.299090] -> #0 (rtnl_mutex){+.+.}:
[   32.304341]        lock_acquire+0x1d5/0x580
[   32.308630]        __mutex_lock+0x16f/0x1a80
[   32.313009]        mutex_lock_nested+0x16/0x20
[   32.317565]        rtnl_lock+0x17/0x20
[   32.321423]        unregister_netdevice_notifier+0x91/0x4e0
[   32.327100]        clusterip_tg_destroy+0x389/0x6e0
[   32.332083]        cleanup_entry+0x218/0x350
[   32.336472]        __do_replace+0x79d/0xa50
[   32.340758]        do_ipt_set_ctl+0x40f/0x5f0
[   32.345220]        nf_setsockopt+0x67/0xc0
[   32.349420]        ip_setsockopt+0xa1/0xb0
[   32.353631]        tcp_setsockopt+0x82/0xd0
[   32.357919]        sock_common_setsockopt+0x95/0xd0
[   32.362901]        SyS_setsockopt+0x189/0x360
[   32.367370]        entry_SYSCALL_64_fastpath+0x29/0xa0
[   32.372612] 
[   32.372612] other info that might help us debug this:
[   32.372612] 
[   32.380720] Chain exists of:
[   32.380720]   rtnl_mutex --> sk_lock-AF_INET6 --> &xt[i].mutex
[   32.380720] 
[   32.391005]  Possible unsafe locking scenario:
[   32.391005] 
[   32.397027]        CPU0                    CPU1
[   32.401660]        ----                    ----
[   32.406291]   lock(&xt[i].mutex);
[   32.409711]                                lock(sk_lock-AF_INET6);
[   32.415996]                                lock(&xt[i].mutex);
[   32.421934]   lock(rtnl_mutex);
[   32.425180] 
[   32.425180]  *** DEADLOCK ***
[   32.425180] 
[   32.431204] 2 locks held by syzkaller702888/3679:
[   32.436009]  #0:  (sk_lock-AF_INET){+.+.}, at: [<00000000185b64bc>] ip_setsockopt+0x8c/0xb0
[   32.444484]  #1:  (&xt[i].mutex){+.+.}, at: [<00000000efadf980>] xt_find_table_lock+0x3e/0x3e0
[   32.453205] 
[   32.453205] stack backtrace:
[   32.457681] CPU: 0 PID: 3679 Comm: syzkaller702888 Not tainted 4.15.0-rc9+ #212
[   32.465094] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   32.474415] Call Trace:
[   32.476971]  dump_stack+0x194/0x257
[   32.480565]  ? arch_local_irq_restore+0x53/0x53
[   32.485208]  print_circular_bug.isra.37+0x2cd/0x2dc
[   32.490192]  ? save_trace+0xe0/0x2b0
[   32.493883]  __lock_acquire+0x30a8/0x3e00
[   32.497998]  ? print_irqtrace_events+0x270/0x270
[   32.502725]  ? debug_check_no_locks_freed+0x3c0/0x3c0
[   32.507883]  ? print_irqtrace_events+0x270/0x270
[   32.512607]  ? print_irqtrace_events+0x270/0x270
[   32.517352]  ? __lock_acquire+0x664/0x3e00
[   32.521572]  ? __lock_acquire+0x664/0x3e00
[   32.525776]  ? __is_insn_slot_addr+0x1fc/0x330
[   32.530326]  ? lock_downgrade+0x980/0x980
[   32.534444]  ? lock_release+0xa40/0xa40
[   32.538387]  ? bpf_prog_kallsyms_find+0xbd/0x440
[   32.543113]  ? check_noncircular+0x20/0x20
[   32.547334]  ? trace_raw_output_xdp_redirect_map_err+0x440/0x440
[   32.553455]  ? is_bpf_text_address+0x7b/0x120
[   32.557918]  ? lock_downgrade+0x980/0x980
[   32.562037]  ? __free_insn_slot+0x5c0/0x5c0
[   32.566327]  lock_acquire+0x1d5/0x580
[   32.570105]  ? lock_acquire+0x1d5/0x580
[   32.574058]  ? rtnl_lock+0x17/0x20
[   32.577568]  ? lock_release+0xa40/0xa40
[   32.581508]  ? trace_event_raw_event_sched_switch+0x800/0x800
[   32.587362]  ? unwind_get_return_address+0x61/0xa0
[   32.592262]  ? rcu_note_context_switch+0x710/0x710
[   32.597160]  ? __might_sleep+0x95/0x190
[   32.601103]  ? rtnl_lock+0x17/0x20
[   32.604621]  __mutex_lock+0x16f/0x1a80
[   32.608476]  ? rtnl_lock+0x17/0x20
[   32.611989]  ? save_trace+0xe0/0x2b0
[   32.615669]  ? rtnl_lock+0x17/0x20
[   32.619176]  ? __lock_acquire+0x36c0/0x3e00
[   32.623463]  ? mutex_lock_io_nested+0x1900/0x1900
[   32.628283]  ? debug_check_no_locks_freed+0x3c0/0x3c0
[   32.633450]  ? debug_check_no_locks_freed+0x3c0/0x3c0
[   32.638608]  ? __free_insn_slot+0x5c0/0x5c0
[   32.642896]  ? is_bpf_text_address+0xa4/0x120
[   32.647360]  ? rcutorture_record_progress+0x10/0x10
[   32.652342]  ? is_bpf_text_address+0xa4/0x120
[   32.656809]  ? kernel_text_address+0x102/0x140
[   32.661370]  ? __kernel_text_address+0xd/0x40
[   32.665831]  ? unwind_get_return_address+0x61/0xa0
[   32.670727]  ? check_noncircular+0x20/0x20
[   32.674926]  ? check_noncircular+0x20/0x20
[   32.679128]  ? save_stack+0xa3/0xd0
[   32.682720]  ? save_stack+0x43/0xd0
[   32.686320]  ? kasan_kmalloc+0xad/0xe0
[   32.690184]  ? __kmalloc_node+0x47/0x70
[   32.694126]  ? check_noncircular+0x20/0x20
[   32.698330]  ? do_ipt_set_ctl+0x40f/0x5f0
[   32.702445]  mutex_lock_nested+0x16/0x20
[   32.706470]  ? mutex_lock_nested+0x16/0x20
[   32.710673]  rtnl_lock+0x17/0x20
[   32.714007]  unregister_netdevice_notifier+0x91/0x4e0
[   32.719164]  ? clusterip_tg_destroy+0x36a/0x6e0
[   32.723806]  ? lock_downgrade+0x980/0x980
[   32.727920]  ? register_netdevice_notifier+0x860/0x860
[   32.733164]  ? __lock_is_held+0xb6/0x140
[   32.737197]  ? mark_held_locks+0xaf/0x100
[   32.741312]  ? do_raw_spin_trylock+0x190/0x190
[   32.745860]  ? __local_bh_enable_ip+0x121/0x230
[   32.750496]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   32.755481]  ? clusterip_tg_destroy+0x350/0x6e0
[   32.760114]  ? trace_hardirqs_on+0xd/0x10
[   32.764229]  clusterip_tg_destroy+0x389/0x6e0
[   32.768700]  ? free_modinfo_version+0x70/0x70
[   32.773163]  ? clusterip_tg+0xa40/0xa40
[   32.777105]  ? cpumask_next+0x24/0x30
[   32.780873]  ? __lock_is_held+0xb6/0x140
[   32.784902]  ? clusterip_tg+0xa40/0xa40
[   32.788855]  cleanup_entry+0x218/0x350
[   32.792708]  ? cleanup_match+0x220/0x220
[   32.796739]  ? find_next_bit+0x27/0x30
[   32.800594]  __do_replace+0x79d/0xa50
[   32.804367]  ? compat_table_info+0x470/0x470
[   32.808743]  ? kasan_check_write+0x14/0x20
[   32.812948]  ? _copy_from_user+0x99/0x110
[   32.817063]  do_ipt_set_ctl+0x40f/0x5f0
[   32.821004]  ? translate_compat_table+0x1b90/0x1b90
[   32.825989]  ? mutex_unlock+0xd/0x10
[   32.829672]  ? nf_sockopt_find.constprop.0+0x1a7/0x220
[   32.834924]  nf_setsockopt+0x67/0xc0
[   32.838606]  ip_setsockopt+0xa1/0xb0
[   32.842288]  tcp_setsockopt+0x82/0xd0
[   32.846060]  sock_common_setsockopt+0x95/0xd0
[   32.850521]  SyS_setsockopt+0x189/0x360
[   32.854462]  ? SyS_recv+0x40/0x40
[   32.857883]  ? entry_SYSCALL_64_fastpath+0x5/0xa0
[   32.862693]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   32.867675]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[   32.872401]  entry_SYSCALL_64_fastpath+0x29/0xa0
[   32.877130] RIP: 0033:0x44900a
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[   32.880285] RSP: 002b:00007ffd06518688 EFLAGS: 00000206 ORIG_RAX: 0000000000000036
[   32.887961] RAX: ffffffffffffffda RBX: 00000000006d20fc RCX: 000000000044900a
[   32.895198] RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000004
[   32.902437] RBP: 00000000006d20fc R08: 00000000000002d8 R09: 0000000001975880
[   32.909674] R10: 00000000006d2528 R11: 0000000000000206 R12: 0000000000000004
[   32.916922] R13: 00000000006d50a4 R14: 00000000006d5050 R15: 00000000004a836c
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