[?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. [ 18.693306] audit: type=1400 audit(1517824879.792:6): avc: denied { map } for pid=4156 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 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.36' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 53.580345] audit: type=1400 audit(1517824914.679:7): avc: denied { map } for pid=4174 comm="syzkaller070593" path="/root/syzkaller070593801" 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 [ 53.597287] ipt_CLUSTERIP: ipt_CLUSTERIP is deprecated and it will removed soon, use xt_cluster instead [ 53.619949] [ 53.621574] ====================================================== [ 53.627857] WARNING: possible circular locking dependency detected [ 53.634147] 4.15.0+ #297 Not tainted [ 53.637827] ------------------------------------------------------ [ 53.644116] syzkaller070593/4174 is trying to acquire lock: [ 53.649793] (rtnl_mutex){+.+.}, at: [<00000000cf6f7e2b>] rtnl_lock+0x17/0x20 [ 53.657065] [ 53.657065] but task is already holding lock: [ 53.663007] (&xt[i].mutex){+.+.}, at: [<00000000b224db37>] xt_find_table_lock+0x3e/0x3e0 [ 53.671296] [ 53.671296] which lock already depends on the new lock. [ 53.671296] [ 53.679577] [ 53.679577] the existing dependency chain (in reverse order) is: [ 53.687164] [ 53.687164] -> #2 (&xt[i].mutex){+.+.}: [ 53.692598] __mutex_lock+0x16f/0x1a80 [ 53.696974] mutex_lock_nested+0x16/0x20 [ 53.701532] xt_find_table_lock+0x3e/0x3e0 [ 53.706258] xt_request_find_table_lock+0x28/0xc0 [ 53.711590] get_info+0x154/0x690 [ 53.715543] do_ip6t_get_ctl+0x159/0xaf0 [ 53.720105] nf_getsockopt+0x6a/0xc0 [ 53.724309] ipv6_getsockopt+0x1df/0x2e0 [ 53.728860] tcp_getsockopt+0x82/0xd0 [ 53.733151] sock_common_getsockopt+0x95/0xd0 [ 53.738137] SyS_getsockopt+0x178/0x340 [ 53.742604] do_syscall_64+0x282/0x940 [ 53.746982] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 53.752661] [ 53.752661] -> #1 (sk_lock-AF_INET6){+.+.}: [ 53.758432] lock_sock_nested+0xc2/0x110 [ 53.762982] do_ipv6_setsockopt.isra.8+0x3c5/0x39d0 [ 53.768489] ipv6_setsockopt+0xd7/0x130 [ 53.772954] rawv6_setsockopt+0x4a/0xf0 [ 53.777417] sock_common_setsockopt+0x95/0xd0 [ 53.782400] SyS_setsockopt+0x189/0x360 [ 53.786874] do_syscall_64+0x282/0x940 [ 53.791252] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 53.796928] [ 53.796928] -> #0 (rtnl_mutex){+.+.}: [ 53.802179] lock_acquire+0x1d5/0x580 [ 53.806477] __mutex_lock+0x16f/0x1a80 [ 53.810854] mutex_lock_nested+0x16/0x20 [ 53.815406] rtnl_lock+0x17/0x20 [ 53.819261] unregister_netdevice_notifier+0x91/0x4e0 [ 53.824940] clusterip_tg_destroy+0x389/0x6e0 [ 53.829936] cleanup_entry+0x218/0x350 [ 53.834312] __do_replace+0x79d/0xa50 [ 53.838600] do_ipt_set_ctl+0x40f/0x5f0 [ 53.843063] nf_setsockopt+0x67/0xc0 [ 53.847264] ip_setsockopt+0x97/0xa0 [ 53.851475] tcp_setsockopt+0x82/0xd0 [ 53.855765] sock_common_setsockopt+0x95/0xd0 [ 53.860749] SyS_setsockopt+0x189/0x360 [ 53.865224] do_syscall_64+0x282/0x940 [ 53.869603] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 53.875367] [ 53.875367] other info that might help us debug this: [ 53.875367] [ 53.883473] Chain exists of: [ 53.883473] rtnl_mutex --> sk_lock-AF_INET6 --> &xt[i].mutex [ 53.883473] [ 53.893758] Possible unsafe locking scenario: [ 53.893758] [ 53.899780] CPU0 CPU1 [ 53.904415] ---- ---- [ 53.909046] lock(&xt[i].mutex); [ 53.912469] lock(sk_lock-AF_INET6); [ 53.918764] lock(&xt[i].mutex); [ 53.924702] lock(rtnl_mutex); [ 53.927949] [ 53.927949] *** DEADLOCK *** [ 53.927949] [ 53.933988] 1 lock held by syzkaller070593/4174: [ 53.938708] #0: (&xt[i].mutex){+.+.}, at: [<00000000b224db37>] xt_find_table_lock+0x3e/0x3e0 [ 53.947431] [ 53.947431] stack backtrace: [ 53.951906] CPU: 0 PID: 4174 Comm: syzkaller070593 Not tainted 4.15.0+ #297 [ 53.958987] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.968311] Call Trace: [ 53.970871] dump_stack+0x194/0x257 [ 53.974469] ? arch_local_irq_restore+0x53/0x53 [ 53.979108] print_circular_bug.isra.38+0x2cd/0x2dc [ 53.984181] ? save_trace+0xe0/0x2b0 [ 53.987874] __lock_acquire+0x30a8/0x3e00 [ 53.992000] ? print_irqtrace_events+0x270/0x270 [ 53.996730] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 54.001888] ? print_irqtrace_events+0x270/0x270 [ 54.006625] ? print_irqtrace_events+0x270/0x270 [ 54.011349] ? __lock_acquire+0x664/0x3e00 [ 54.015563] ? __lock_acquire+0x664/0x3e00 [ 54.019771] ? __is_insn_slot_addr+0x1fc/0x330 [ 54.024321] ? lock_downgrade+0x980/0x980 [ 54.028448] ? lock_release+0xa40/0xa40 [ 54.032397] ? bpf_prog_kallsyms_find+0xbd/0x440 [ 54.037124] ? modules_open+0xa0/0xa0 [ 54.040893] ? trace_raw_output_xdp_redirect_map_err+0x440/0x440 [ 54.047009] ? lock_downgrade+0x980/0x980 [ 54.051127] ? __free_insn_slot+0x5c0/0x5c0 [ 54.055417] lock_acquire+0x1d5/0x580 [ 54.059188] ? lock_acquire+0x1d5/0x580 [ 54.063131] ? rtnl_lock+0x17/0x20 [ 54.066652] ? lock_release+0xa40/0xa40 [ 54.070595] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 54.076451] ? unwind_get_return_address+0x61/0xa0 [ 54.081363] ? rcu_note_context_switch+0x710/0x710 [ 54.086273] ? __might_sleep+0x95/0x190 [ 54.090216] ? rtnl_lock+0x17/0x20 [ 54.093723] __mutex_lock+0x16f/0x1a80 [ 54.097580] ? rtnl_lock+0x17/0x20 [ 54.101087] ? save_trace+0xe0/0x2b0 [ 54.104770] ? rtnl_lock+0x17/0x20 [ 54.108280] ? __lock_acquire+0x36c0/0x3e00 [ 54.112582] ? mutex_lock_io_nested+0x1900/0x1900 [ 54.117395] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 54.122555] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 54.127712] ? lock_release+0xa40/0xa40 [ 54.131663] ? __free_insn_slot+0x5c0/0x5c0 [ 54.135965] ? is_bpf_text_address+0xa4/0x120 [ 54.140433] ? rcutorture_record_progress+0x10/0x10 [ 54.145421] ? kernel_text_address+0x102/0x140 [ 54.149977] ? __kernel_text_address+0xd/0x40 [ 54.154458] ? unwind_get_return_address+0x61/0xa0 [ 54.159357] ? __save_stack_trace+0x7e/0xd0 [ 54.163668] ? depot_save_stack+0x12c/0x490 [ 54.167963] ? check_noncircular+0x20/0x20 [ 54.172169] ? save_stack+0x43/0xd0 [ 54.175763] ? kasan_kmalloc+0xad/0xe0 [ 54.179618] ? __kmalloc_node+0x47/0x70 [ 54.183562] ? kvmalloc_node+0x99/0xd0 [ 54.187418] ? __do_replace+0x2e3/0xa50 [ 54.191361] ? do_ipt_set_ctl+0x40f/0x5f0 [ 54.195478] ? pcpu_chunk_relocate+0x315/0x770 [ 54.200128] mutex_lock_nested+0x16/0x20 [ 54.204158] ? mutex_lock_nested+0x16/0x20 [ 54.208362] rtnl_lock+0x17/0x20 [ 54.211709] unregister_netdevice_notifier+0x91/0x4e0 [ 54.216880] ? clusterip_tg_destroy+0x36a/0x6e0 [ 54.221517] ? lock_downgrade+0x980/0x980 [ 54.225632] ? register_netdevice_notifier+0x860/0x860 [ 54.230878] ? __lock_is_held+0xb6/0x140 [ 54.234907] ? mark_held_locks+0xaf/0x100 [ 54.239024] ? do_raw_spin_trylock+0x190/0x190 [ 54.243577] ? __local_bh_enable_ip+0x121/0x230 [ 54.248218] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 54.253206] ? clusterip_tg_destroy+0x350/0x6e0 [ 54.257842] ? trace_hardirqs_on+0xd/0x10 [ 54.261965] clusterip_tg_destroy+0x389/0x6e0 [ 54.266442] ? free_modinfo_version+0x70/0x70 [ 54.270909] ? clusterip_tg+0xa40/0xa40 [ 54.274853] ? cpumask_next+0x24/0x30 [ 54.278621] ? __lock_is_held+0xb6/0x140 [ 54.282652] ? clusterip_tg+0xa40/0xa40 [ 54.286597] cleanup_entry+0x218/0x350 [ 54.290452] ? cleanup_match+0x220/0x220 [ 54.294483] ? find_next_bit+0x27/0x30 [ 54.298340] __do_replace+0x79d/0xa50 [ 54.302123] ? compat_table_info+0x470/0x470 [ 54.306513] ? kasan_check_write+0x14/0x20 [ 54.310715] ? _copy_from_user+0x99/0x110 [ 54.314831] do_ipt_set_ctl+0x40f/0x5f0 [ 54.318775] ? translate_compat_table+0x1b90/0x1b90 [ 54.323761] ? mutex_unlock+0xd/0x10 [ 54.327445] ? nf_sockopt_find.constprop.0+0x1a7/0x220 [ 54.332690] nf_setsockopt+0x67/0xc0 [ 54.336374] ip_setsockopt+0x97/0xa0 [ 54.340062] tcp_setsockopt+0x82/0xd0 [ 54.343834] sock_common_setsockopt+0x95/0xd0 [ 54.348299] SyS_setsockopt+0x189/0x360 [ 54.352245] ? SyS_recv+0x40/0x40 [ 54.355675] ? mm_fault_error+0x2c0/0x2c0 [ 54.359792] ? move_addr_to_kernel+0x60/0x60 [ 54.364190] ? do_syscall_64+0xb7/0x940 [ 54.368145] ? SyS_recv+0x40/0x40 [ 54.371568] do_syscall_64+0x282/0x940 [ 54.375433] ? __do_page_fault+0xc90/0xc90 [ 54.379648] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 54.384373] ? syscall_return_slowpath+0x550/0x550 [ 54.389270] ? syscall_return_slowpath+0x2ac/0x550 [ 54.394172] ? prepare_exit_to_usermode+0x350/0x350 [ 54.399157] ? retint_user+0x18/0x18 [ 54.402842] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 54.407655] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 54.412903] RIP: 0033:0x44a47a [ 54.416060] RSP: 002b:00007ffeac385da8 EFLAGS: 00000206 ORIG_RAX: 0000000000000036 [ 54.423736] RAX: ffffffffffffffda RBX: 00000000006dc100 RCX: 000000000044a47a executing program executing program executing program executing program executing program executing program executing program executing program [ 54.430976] RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003 [ 54.438231] RBP: 00000000006dc100 R08: 00000000000002d8 R09: 0000000000000001 [ 54.445476] R10: 00000000006dc528 R11: 0000000000000206 R12: 00007ffeac385dd0 [ 54.452714] R13: 0000000000000003 R14: 00000000006df0a8 R15: 0000000000000000 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program