Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.159' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 28.371852] Cannot find del_set index 0 as target executing program [ 28.406027] ip6_tables: ip6tables: counters copy to user failed while replacing table [ 28.420997] [ 28.422627] ====================================================== [ 28.428940] WARNING: possible circular locking dependency detected [ 28.435278] 4.14.228-syzkaller #0 Not tainted [ 28.439746] ------------------------------------------------------ [ 28.446035] syz-executor463/7975 is trying to acquire lock: [ 28.451718] (&table[i].mutex){+.+.}, at: [] ip_set_nfnl_put+0x11a/0x310 [ 28.460103] [ 28.460103] but task is already holding lock: [ 28.466176] (&xt[i].mutex){+.+.}, at: [] xt_find_table_lock+0x38/0x3d0 [ 28.474605] [ 28.474605] which lock already depends on the new lock. [ 28.474605] [ 28.482896] [ 28.482896] the existing dependency chain (in reverse order) is: [ 28.490488] [ 28.490488] -> #1 (&xt[i].mutex){+.+.}: [ 28.495924] __mutex_lock+0xc4/0x1310 [ 28.500222] target_revfn+0x43/0x210 [ 28.504429] xt_find_revision+0x15e/0x1d0 [ 28.509109] nfnl_compat_get+0x1f7/0x870 [ 28.513667] nfnetlink_rcv_msg+0x9bb/0xc00 [ 28.518397] netlink_rcv_skb+0x125/0x390 [ 28.522954] nfnetlink_rcv+0x1ab/0x1da0 [ 28.527424] netlink_unicast+0x437/0x610 [ 28.531978] netlink_sendmsg+0x62e/0xb80 [ 28.536532] sock_sendmsg+0xb5/0x100 [ 28.540768] ___sys_sendmsg+0x6c8/0x800 [ 28.545234] __sys_sendmsg+0xa3/0x120 [ 28.549542] SyS_sendmsg+0x27/0x40 [ 28.553582] do_syscall_64+0x1d5/0x640 [ 28.557966] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 28.563647] [ 28.563647] -> #0 (&table[i].mutex){+.+.}: [ 28.569355] lock_acquire+0x170/0x3f0 [ 28.573654] __mutex_lock+0xc4/0x1310 [ 28.577950] ip_set_nfnl_put+0x11a/0x310 [ 28.582507] set_target_v1_destroy+0x100/0x150 [ 28.587583] cleanup_entry+0x232/0x310 [ 28.591979] __do_replace+0x38d/0x580 [ 28.596274] do_ip6t_set_ctl+0x256/0x3b0 [ 28.600832] nf_setsockopt+0x5f/0xb0 [ 28.605053] ipv6_setsockopt+0xc0/0x120 [ 28.609615] udpv6_setsockopt+0x45/0x80 [ 28.614102] SyS_setsockopt+0x110/0x1e0 [ 28.618570] do_syscall_64+0x1d5/0x640 [ 28.622960] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 28.628643] [ 28.628643] other info that might help us debug this: [ 28.628643] [ 28.636758] Possible unsafe locking scenario: [ 28.636758] [ 28.642811] CPU0 CPU1 [ 28.647452] ---- ---- [ 28.652104] lock(&xt[i].mutex); [ 28.655531] lock(&table[i].mutex); [ 28.661736] lock(&xt[i].mutex); [ 28.668287] lock(&table[i].mutex); [ 28.671994] [ 28.671994] *** DEADLOCK *** [ 28.671994] [ 28.678034] 1 lock held by syz-executor463/7975: [ 28.682780] #0: (&xt[i].mutex){+.+.}, at: [] xt_find_table_lock+0x38/0x3d0 [ 28.691541] [ 28.691541] stack backtrace: [ 28.696013] CPU: 0 PID: 7975 Comm: syz-executor463 Not tainted 4.14.228-syzkaller #0 [ 28.703865] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.713194] Call Trace: [ 28.715759] dump_stack+0x1b2/0x281 [ 28.719364] print_circular_bug.constprop.0.cold+0x2d7/0x41e [ 28.725144] __lock_acquire+0x2e0e/0x3f20 [ 28.729268] ? unwind_get_return_address+0x51/0x90 [ 28.734173] ? trace_hardirqs_on+0x10/0x10 [ 28.738399] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 28.743497] ? __lock_acquire+0x5fc/0x3f20 [ 28.747708] lock_acquire+0x170/0x3f0 [ 28.751505] ? ip_set_nfnl_put+0x11a/0x310 [ 28.755715] ? ip_set_nfnl_put+0x11a/0x310 [ 28.759923] __mutex_lock+0xc4/0x1310 [ 28.763696] ? ip_set_nfnl_put+0x11a/0x310 [ 28.768260] ? ip_set_nfnl_put+0x11a/0x310 [ 28.772471] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 28.777556] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 28.782998] ? ip_set_nfnl_put+0xe9/0x310 [ 28.787119] ? lock_acquire+0x170/0x3f0 [ 28.791066] ? lock_downgrade+0x740/0x740 [ 28.795191] ip_set_nfnl_put+0x11a/0x310 [ 28.799226] set_target_v1_destroy+0x100/0x150 [ 28.803781] ? set_target_v3_destroy+0x200/0x200 [ 28.808512] cleanup_entry+0x232/0x310 [ 28.812396] ? cpumask_next+0x30/0x40 [ 28.816193] ? compat_do_ip6t_get_ctl+0x820/0x820 [ 28.821023] __do_replace+0x38d/0x580 [ 28.824799] ? ip6t_unregister_table+0x60/0x60 [ 28.829356] do_ip6t_set_ctl+0x256/0x3b0 [ 28.833406] ? compat_do_ip6t_set_ctl+0x140/0x140 [ 28.838223] ? nf_sockopt_find.constprop.0+0x1ad/0x220 [ 28.843492] nf_setsockopt+0x5f/0xb0 [ 28.847181] ipv6_setsockopt+0xc0/0x120 [ 28.851130] udpv6_setsockopt+0x45/0x80 [ 28.855082] SyS_setsockopt+0x110/0x1e0 [ 28.859051] ? SyS_recv+0x40/0x40 [ 28.862493] ? up_read+0x17/0x30 [ 28.865840] ? __do_page_fault+0x159/0xad0 [ 28.870055] ? do_syscall_64+0x4c/0x640 [ 28.874023] ? SyS_recv+0x40/0x40 [ 28.877459] do_syscall_64+0x1d5/0x640 [ 28.881345] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 28.886513] RIP: 0033:0x4410c9 [ 28.889679] RSP: 002b:00007ffd46fc7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 [ 28.897381] RAX: ffffffffffffffda RBX: 0000000000006f09 RCX: 00000000004410c9 executing program [ 28.904767] RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003 [ 28.912206] RBP: 0000000000000000 R08: 0000000000000400 R09: 00007ffd46fc71d8 [ 28.919518] R10: 0000000020000040 R11: 0000000000000246 R12: 00007ffd46fc704c [ 28.926773] R13: 431bde82d7b634db R14: 00000000004af018 R15: 0000000000400488 [ 28.939353] ip6_tables: ip6tables: counters copy to user failed while replacing table executing program executing program executing program executing program [ 28.958472] ip6_tables: ip6tables: counters copy to user failed while replacing table [ 28.970919] ip6_tables: ip6tables: counters copy to user failed while replacing table [ 28.984194] ip6_tables: ip6tables: counters copy to user failed while replacing table [ 28.996338] ip6_tables: ip6tables: counters copy to user failed while replacing table executing program executing program executing program [ 29.010077] ip6_tables: ip6tables: counters copy to user failed while replacing table [ 29.023794] ip6_tables: ip6tables: counters copy to user failed while replacing table [ 29.042693] ip6_tables: ip6tables: counters copy to user failed while replacing table executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 29.057539] ip6_tables: ip6tables: counters copy to user failed while replacing table executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 33.408936] net_ratelimit: 940 callbacks suppressed [ 33.408938] ip6_tables: ip6tables: counters copy to user failed while replacing table [ 33.427500] ip6_tables: ip6tables: counters copy to user failed while replacing table [ 33.440110] ip6_tables: ip6tables: counters copy to user failed while replacing table executing program executing program executing program executing program [ 33.452508] ip6_tables: ip6tables: counters copy to user failed while replacing table [ 33.464777] ip6_tables: ip6tables: counters copy to user failed while replacing table [ 33.478105] ip6_tables: ip6tables: counters copy to user failed while replacing table [ 33.490305] ip6_tables: ip6tables: counters copy to user failed while replacing table executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 33.502467] ip6_tables: ip6tables: counters copy to user failed while replacing table [ 33.514676] ip6_tables: ip6tables: counters copy to user failed while replacing table [ 33.526922] ip6_tables: ip6tables: counters copy to user failed while replacing table executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program