[....] Starting enhanced syslogd: rsyslogd[ 16.264092] audit: type=1400 audit(1517251921.934:5): avc: denied { syslog } for pid=3896 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: [ 18.701115] audit: type=1400 audit(1517251924.371:6): avc: denied { map } for pid=4034 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 '10.128.15.201' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 [ 25.266212] audit: type=1400 audit(1517251930.937:7): avc: denied { map } for pid=4048 comm="syzkaller440283" path="/root/syzkaller440283515" 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 [ 25.658829] 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 [ 26.011244] ipt_CLUSTERIP: ipt_CLUSTERIP is deprecated and it will removed soon, use xt_cluster instead [ 26.031834] [ 26.033482] ====================================================== [ 26.039778] WARNING: possible circular locking dependency detected [ 26.046073] 4.15.0-rc9+ #215 Not tainted [ 26.050099] ------------------------------------------------------ [ 26.056384] syzkaller440283/4048 is trying to acquire lock: [ 26.062063] (rtnl_mutex){+.+.}, at: [<000000003ba567c5>] rtnl_lock+0x17/0x20 [ 26.069318] [ 26.069318] but task is already holding lock: [ 26.075256] (&xt[i].mutex){+.+.}, at: [<000000008e542656>] xt_find_table_lock+0x3e/0x3e0 [ 26.083547] [ 26.083547] which lock already depends on the new lock. [ 26.083547] [ 26.091841] [ 26.091841] the existing dependency chain (in reverse order) is: [ 26.099428] [ 26.099428] -> #2 (&xt[i].mutex){+.+.}: [ 26.104862] __mutex_lock+0x16f/0x1a80 [ 26.109245] mutex_lock_nested+0x16/0x20 [ 26.113798] xt_find_table_lock+0x3e/0x3e0 [ 26.118523] xt_request_find_table_lock+0x28/0xc0 [ 26.123856] get_info+0x154/0x690 [ 26.127797] do_arpt_get_ctl+0x2a9/0xa00 [ 26.132348] nf_getsockopt+0x6a/0xc0 [ 26.136550] ip_getsockopt+0x15c/0x220 [ 26.140928] udp_getsockopt+0x45/0x80 [ 26.145218] ipv6_getsockopt+0xf3/0x2e0 [ 26.149683] tcp_getsockopt+0x82/0xd0 [ 26.153972] sock_common_getsockopt+0x95/0xd0 [ 26.158967] SyS_getsockopt+0x178/0x340 [ 26.163434] entry_SYSCALL_64_fastpath+0x29/0xa0 [ 26.168677] [ 26.168677] -> #1 (sk_lock-AF_INET6){+.+.}: [ 26.174454] lock_sock_nested+0xc2/0x110 [ 26.179008] do_ipv6_setsockopt.isra.8+0x3c5/0x39d0 [ 26.184524] ipv6_setsockopt+0xd7/0x150 [ 26.188991] tcp_setsockopt+0x82/0xd0 [ 26.193282] sock_common_setsockopt+0x95/0xd0 [ 26.198445] SyS_setsockopt+0x189/0x360 [ 26.202912] entry_SYSCALL_64_fastpath+0x29/0xa0 [ 26.208154] [ 26.208154] -> #0 (rtnl_mutex){+.+.}: [ 26.213408] lock_acquire+0x1d5/0x580 [ 26.217703] __mutex_lock+0x16f/0x1a80 [ 26.222084] mutex_lock_nested+0x16/0x20 [ 26.226638] rtnl_lock+0x17/0x20 [ 26.230502] unregister_netdevice_notifier+0x91/0x4e0 [ 26.236183] clusterip_tg_destroy+0x389/0x6e0 [ 26.241179] cleanup_entry+0x218/0x350 [ 26.245556] __do_replace+0x79d/0xa50 [ 26.249847] do_ipt_set_ctl+0x40f/0x5f0 [ 26.254311] nf_setsockopt+0x67/0xc0 [ 26.258514] ip_setsockopt+0xa1/0xb0 [ 26.262714] tcp_setsockopt+0x82/0xd0 [ 26.267006] sock_common_setsockopt+0x95/0xd0 [ 26.271996] SyS_setsockopt+0x189/0x360 [ 26.276467] entry_SYSCALL_64_fastpath+0x29/0xa0 [ 26.281710] [ 26.281710] other info that might help us debug this: [ 26.281710] [ 26.289822] Chain exists of: [ 26.289822] rtnl_mutex --> sk_lock-AF_INET6 --> &xt[i].mutex [ 26.289822] [ 26.300112] Possible unsafe locking scenario: [ 26.300112] [ 26.306138] CPU0 CPU1 [ 26.310771] ---- ---- [ 26.315404] lock(&xt[i].mutex); [ 26.318825] lock(sk_lock-AF_INET6); [ 26.325112] lock(&xt[i].mutex); [ 26.331050] lock(rtnl_mutex); [ 26.334300] [ 26.334300] *** DEADLOCK *** [ 26.334300] [ 26.340326] 2 locks held by syzkaller440283/4048: [ 26.345142] #0: (sk_lock-AF_INET){+.+.}, at: [<00000000f32323b4>] ip_setsockopt+0x8c/0xb0 [ 26.353614] #1: (&xt[i].mutex){+.+.}, at: [<000000008e542656>] xt_find_table_lock+0x3e/0x3e0 [ 26.362339] [ 26.362339] stack backtrace: [ 26.366807] CPU: 0 PID: 4048 Comm: syzkaller440283 Not tainted 4.15.0-rc9+ #215 [ 26.374222] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.383559] Call Trace: [ 26.386130] dump_stack+0x194/0x257 [ 26.389727] ? arch_local_irq_restore+0x53/0x53 [ 26.394367] print_circular_bug.isra.37+0x2cd/0x2dc [ 26.399355] ? save_trace+0xe0/0x2b0 [ 26.403050] __lock_acquire+0x30a8/0x3e00 [ 26.407166] ? print_irqtrace_events+0x270/0x270 [ 26.411895] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 26.417055] ? print_irqtrace_events+0x270/0x270 [ 26.421781] ? print_irqtrace_events+0x270/0x270 [ 26.426504] ? __lock_acquire+0x664/0x3e00 [ 26.430709] ? __lock_acquire+0x664/0x3e00 [ 26.434915] ? __is_insn_slot_addr+0x1fc/0x330 [ 26.439468] ? lock_downgrade+0x980/0x980 [ 26.443589] ? lock_release+0xa40/0xa40 [ 26.447535] ? bpf_prog_kallsyms_find+0xbd/0x440 [ 26.452261] ? check_noncircular+0x20/0x20 [ 26.456467] ? trace_raw_output_xdp_redirect_map_err+0x440/0x440 [ 26.462584] ? is_bpf_text_address+0x7b/0x120 [ 26.467053] ? lock_downgrade+0x980/0x980 [ 26.471189] ? __free_insn_slot+0x5c0/0x5c0 [ 26.475484] lock_acquire+0x1d5/0x580 [ 26.479256] ? lock_acquire+0x1d5/0x580 [ 26.483201] ? rtnl_lock+0x17/0x20 [ 26.486729] ? lock_release+0xa40/0xa40 [ 26.490677] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 26.496533] ? unwind_get_return_address+0x61/0xa0 [ 26.501441] ? rcu_note_context_switch+0x710/0x710 [ 26.506341] ? __might_sleep+0x95/0x190 [ 26.510286] ? rtnl_lock+0x17/0x20 [ 26.513795] __mutex_lock+0x16f/0x1a80 [ 26.517653] ? rtnl_lock+0x17/0x20 [ 26.521163] ? save_trace+0xe0/0x2b0 [ 26.524852] ? rtnl_lock+0x17/0x20 [ 26.528363] ? __lock_acquire+0x36c0/0x3e00 [ 26.532655] ? mutex_lock_io_nested+0x1900/0x1900 [ 26.537471] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 26.542631] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 26.547793] ? __free_insn_slot+0x5c0/0x5c0 [ 26.552089] ? is_bpf_text_address+0xa4/0x120 [ 26.556558] ? rcutorture_record_progress+0x10/0x10 [ 26.561545] ? is_bpf_text_address+0xa4/0x120 [ 26.566017] ? kernel_text_address+0x102/0x140 [ 26.570575] ? __kernel_text_address+0xd/0x40 [ 26.575042] ? unwind_get_return_address+0x61/0xa0 [ 26.579943] ? check_noncircular+0x20/0x20 [ 26.584146] ? check_noncircular+0x20/0x20 [ 26.588355] ? save_stack+0xa3/0xd0 [ 26.591950] ? save_stack+0x43/0xd0 [ 26.595546] ? kasan_kmalloc+0xad/0xe0 [ 26.599412] ? __kmalloc_node+0x47/0x70 [ 26.603364] ? check_noncircular+0x20/0x20 [ 26.607567] ? do_ipt_set_ctl+0x40f/0x5f0 [ 26.611694] mutex_lock_nested+0x16/0x20 [ 26.615724] ? mutex_lock_nested+0x16/0x20 [ 26.619928] rtnl_lock+0x17/0x20 [ 26.623265] unregister_netdevice_notifier+0x91/0x4e0 [ 26.628430] ? clusterip_tg_destroy+0x36a/0x6e0 [ 26.633072] ? lock_downgrade+0x980/0x980 [ 26.637191] ? register_netdevice_notifier+0x860/0x860 [ 26.642440] ? __lock_is_held+0xb6/0x140 [ 26.646474] ? mark_held_locks+0xaf/0x100 [ 26.650595] ? do_raw_spin_trylock+0x190/0x190 [ 26.655160] ? __local_bh_enable_ip+0x121/0x230 [ 26.659800] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.664789] ? clusterip_tg_destroy+0x350/0x6e0 [ 26.669437] ? trace_hardirqs_on+0xd/0x10 [ 26.673560] clusterip_tg_destroy+0x389/0x6e0 [ 26.678029] ? free_modinfo_version+0x70/0x70 [ 26.682504] ? clusterip_tg+0xa40/0xa40 [ 26.686453] ? cpumask_next+0x24/0x30 [ 26.690223] ? __lock_is_held+0xb6/0x140 [ 26.694254] ? clusterip_tg+0xa40/0xa40 [ 26.698198] cleanup_entry+0x218/0x350 [ 26.702057] ? cleanup_match+0x220/0x220 [ 26.706088] ? find_next_bit+0x27/0x30 [ 26.709946] __do_replace+0x79d/0xa50 [ 26.713719] ? compat_table_info+0x470/0x470 [ 26.718100] ? kasan_check_write+0x14/0x20 [ 26.722314] ? _copy_from_user+0x99/0x110 [ 26.726436] do_ipt_set_ctl+0x40f/0x5f0 [ 26.730385] ? translate_compat_table+0x1b90/0x1b90 [ 26.735375] ? mutex_unlock+0xd/0x10 [ 26.739067] ? nf_sockopt_find.constprop.0+0x1a7/0x220 [ 26.744317] nf_setsockopt+0x67/0xc0 [ 26.748004] ip_setsockopt+0xa1/0xb0 [ 26.751703] tcp_setsockopt+0x82/0xd0 [ 26.755480] sock_common_setsockopt+0x95/0xd0 [ 26.759947] SyS_setsockopt+0x189/0x360 [ 26.763900] ? SyS_recv+0x40/0x40 [ 26.767325] ? entry_SYSCALL_64_fastpath+0x5/0xa0 [ 26.772143] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.777130] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.781860] entry_SYSCALL_64_fastpath+0x29/0xa0 [ 26.786586] RIP: 0033:0x44e67a [ 26.789750] RSP: 002b:00007ffe30213528 EFLAGS: 00000206 ORIG_RAX: 0000000000000036 [ 26.797434] RAX: ffffffffffffffda RBX: 00000000006dc100 RCX: 000000000044e67a [ 26.804675] RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000004 executing program executing program [ 26.811915] RBP: 00000000006dc100 R08: 00000000000002d8 R09: 000000000194b880 [ 26.819157] R10: 00000000006dc528 R11: 0000000000000206 R12: 0000000000000004 [ 26.826410] R13: 00000000006df0a8 R14: 00000000006df050 R15: 00000000004b0c2c executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program