[....] Starting OpenBSD Secure Shell server: sshd[ 18.709236] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.216203] random: sshd: uninitialized urandom read (32 bytes read) [ 23.494914] random: sshd: uninitialized urandom read (32 bytes read) [ 24.046907] random: sshd: uninitialized urandom read (32 bytes read) [ 24.203502] sshd (4376) used greatest stack depth: 17128 bytes left [ 24.225261] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts. [ 29.806996] random: sshd: uninitialized urandom read (32 bytes read) [ 29.900931] IPVS: ftp: loaded support on port[0] = 21 [ 30.026672] bridge0: port 1(bridge_slave_0) entered blocking state [ 30.033125] bridge0: port 1(bridge_slave_0) entered disabled state [ 30.040362] device bridge_slave_0 entered promiscuous mode [ 30.056592] bridge0: port 2(bridge_slave_1) entered blocking state [ 30.063095] bridge0: port 2(bridge_slave_1) entered disabled state [ 30.070249] device bridge_slave_1 entered promiscuous mode [ 30.086587] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 30.102627] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 30.145192] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 30.163278] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 30.225411] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 30.232715] team0: Port device team_slave_0 added [ 30.247469] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 30.255125] team0: Port device team_slave_1 added [ 30.269703] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 30.286154] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 30.301911] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 30.318760] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported [ 30.434088] bridge0: port 2(bridge_slave_1) entered blocking state [ 30.440674] bridge0: port 2(bridge_slave_1) entered forwarding state [ 30.447622] bridge0: port 1(bridge_slave_0) entered blocking state [ 30.454073] bridge0: port 1(bridge_slave_0) entered forwarding state 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 [ 30.861073] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 30.867174] 8021q: adding VLAN 0 to HW filter on device bond0 [ 30.909636] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 30.951327] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 30.959990] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 30.995592] 8021q: adding VLAN 0 to HW filter on device team0 executing program [ 31.221349] [ 31.222983] ================================ [ 31.227362] WARNING: inconsistent lock state [ 31.231744] 4.18.0-rc8+ #179 Not tainted [ 31.235774] -------------------------------- [ 31.240153] inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage. [ 31.246383] syz-executor551/4387 [HC0[0]:SC0[0]:HE1:SE1] takes: [ 31.252414] (____ptrval____) (&(&tlocks[i])->rlock){+.?.}, at: ila_xlat_nl_cmd_del_mapping+0x46b/0xb00 [ 31.261846] {IN-SOFTIRQ-W} state was registered at: [ 31.266847] lock_acquire+0x1e4/0x540 [ 31.270715] _raw_spin_lock_bh+0x31/0x40 [ 31.274841] fdb_create+0x5cc/0x1710 [ 31.278618] br_fdb_update+0x4e7/0xd40 [ 31.282569] br_handle_frame_finish+0xa23/0x1960 [ 31.287389] br_nf_hook_thresh+0x48d/0x5f0 [ 31.291683] br_nf_pre_routing_finish_ipv6+0x7bc/0xef0 [ 31.297021] br_nf_pre_routing_ipv6+0x4af/0xac0 [ 31.301749] br_nf_pre_routing+0xb33/0x17d0 [ 31.306132] nf_hook_slow+0xc2/0x1c0 [ 31.309954] br_handle_frame+0xc0d/0x1a20 [ 31.314174] __netif_receive_skb_core+0x1455/0x3af0 [ 31.319254] __netif_receive_skb_one_core+0xd0/0x200 [ 31.324417] __netif_receive_skb+0x2c/0x1e0 [ 31.328805] process_backlog+0x219/0x760 [ 31.332926] net_rx_action+0x7a5/0x1920 [ 31.336971] __do_softirq+0x2e8/0xb17 [ 31.340841] irq_exit+0x1d4/0x210 [ 31.344357] smp_apic_timer_interrupt+0x186/0x730 [ 31.349262] apic_timer_interrupt+0xf/0x20 [ 31.353562] native_safe_halt+0x6/0x10 [ 31.357510] default_idle+0xc7/0x450 [ 31.361289] arch_cpu_idle+0x10/0x20 [ 31.365069] default_idle_call+0x6d/0x90 [ 31.369260] do_idle+0x3aa/0x570 [ 31.372763] cpu_startup_entry+0x10c/0x120 [ 31.377069] start_secondary+0x433/0x5d0 [ 31.381196] secondary_startup_64+0xa5/0xb0 [ 31.385577] irq event stamp: 51111 [ 31.389095] hardirqs last enabled at (51111): [] queue_work_on+0xe8/0x1e0 [ 31.397661] hardirqs last disabled at (51110): [] queue_work_on+0x9f/0x1e0 [ 31.406220] softirqs last enabled at (51088): [] release_sock+0x1ec/0x2c0 [ 31.414877] softirqs last disabled at (51086): [] release_sock+0x7d/0x2c0 [ 31.423346] [ 31.423346] other info that might help us debug this: [ 31.429995] Possible unsafe locking scenario: [ 31.429995] [ 31.436023] CPU0 [ 31.438579] ---- [ 31.441132] lock(&(&tlocks[i])->rlock); [ 31.445252] [ 31.447978] lock(&(&tlocks[i])->rlock); [ 31.452277] [ 31.452277] *** DEADLOCK *** [ 31.452277] [ 31.458320] 1 lock held by syz-executor551/4387: [ 31.463047] #0: (____ptrval____) (cb_lock){++++}, at: genl_rcv+0x19/0x40 [ 31.469961] [ 31.469961] stack backtrace: [ 31.474433] CPU: 0 PID: 4387 Comm: syz-executor551 Not tainted 4.18.0-rc8+ #179 [ 31.481849] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.491176] Call Trace: [ 31.493744] dump_stack+0x1c9/0x2b4 [ 31.497366] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.502549] ? release_sock+0x7d/0x2c0 [ 31.506417] ? vprintk_func+0x81/0xe7 [ 31.510197] print_usage_bug.cold.63+0x320/0x41a [ 31.514926] ? save_stack_trace+0x1a/0x20 [ 31.519051] mark_lock+0x1048/0x19f0 [ 31.522743] ? print_shortest_lock_dependencies+0x80/0x80 [ 31.528370] ? print_usage_bug+0xc0/0xc0 [ 31.532413] ? graph_lock+0x170/0x170 [ 31.536191] ? find_held_lock+0x36/0x1c0 [ 31.540230] ? graph_lock+0x170/0x170 [ 31.544009] __lock_acquire+0x7ca/0x5020 [ 31.548061] ? find_held_lock+0x36/0x1c0 [ 31.552123] ? trace_hardirqs_on+0x10/0x10 [ 31.556332] ? workqueue_congested+0x3c0/0x3c0 [ 31.560900] ? kasan_check_read+0x11/0x20 [ 31.565027] ? do_raw_spin_unlock+0xa7/0x2f0 [ 31.569414] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 31.573981] ? _raw_spin_unlock+0x22/0x30 [ 31.578107] ? __queue_work+0x68d/0x1410 [ 31.582146] ? flush_rcu_work+0x90/0x90 [ 31.586103] ? graph_lock+0x170/0x170 [ 31.589885] ? print_usage_bug+0xc0/0xc0 [ 31.593924] ? print_usage_bug+0xc0/0xc0 [ 31.597964] lock_acquire+0x1e4/0x540 [ 31.601743] ? ila_xlat_nl_cmd_del_mapping+0x46b/0xb00 [ 31.607065] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.612067] ? lock_release+0xa30/0xa30 [ 31.616021] ? __do_once_done+0x24f/0x310 [ 31.620149] ? __do_once_start+0xd0/0xd0 [ 31.624188] _raw_spin_lock+0x2a/0x40 [ 31.627964] ? ila_xlat_nl_cmd_del_mapping+0x46b/0xb00 [ 31.633217] ila_xlat_nl_cmd_del_mapping+0x46b/0xb00 [ 31.638296] ? ila_xlat_nl_cmd_add_mapping+0x17e0/0x17e0 [ 31.643725] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 31.648890] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 31.653880] ? validate_nla+0x2d9/0x7b0 [ 31.657829] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.663348] ? __netlink_ns_capable+0x100/0x130 [ 31.668042] genl_family_rcv_msg+0x8a3/0x1140 [ 31.672525] ? genl_unregister_family+0x8b0/0x8b0 [ 31.677458] ? lock_downgrade+0x8f0/0x8f0 [ 31.681587] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 31.686584] ? kasan_check_read+0x11/0x20 [ 31.690710] ? lock_acquire+0x1e4/0x540 [ 31.694660] ? genl_rcv+0x19/0x40 [ 31.698095] ? radix_tree_lookup+0x21/0x30 [ 31.702305] genl_rcv_msg+0xc6/0x168 [ 31.705994] netlink_rcv_skb+0x172/0x440 [ 31.710031] ? genl_family_rcv_msg+0x1140/0x1140 [ 31.714760] ? netlink_ack+0xbe0/0xbe0 [ 31.718627] ? rcu_report_qs_rnp+0x7a0/0x7a0 [ 31.723011] genl_rcv+0x28/0x40 [ 31.726343] netlink_unicast+0x5a0/0x760 [ 31.730394] ? netlink_attachskb+0x9a0/0x9a0 [ 31.734782] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.740294] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 31.745287] netlink_sendmsg+0xa18/0xfc0 [ 31.749325] ? netlink_unicast+0x760/0x760 [ 31.753537] ? move_addr_to_kernel.part.18+0x100/0x100 [ 31.758792] ? security_socket_sendmsg+0x94/0xc0 [ 31.763523] ? netlink_unicast+0x760/0x760 [ 31.767743] sock_sendmsg+0xd5/0x120 [ 31.771440] ___sys_sendmsg+0x7fd/0x930 [ 31.775393] ? copy_msghdr_from_user+0x580/0x580 [ 31.780209] ? graph_lock+0x170/0x170 [ 31.783999] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.789514] ? __fget_light+0x2f7/0x440 [ 31.793463] ? fget_raw+0x20/0x20 [ 31.797003] ? lock_downgrade+0x8f0/0x8f0 [ 31.801144] ? handle_mm_fault+0x8c4/0xc80 [ 31.805361] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.810878] ? sockfd_lookup_light+0xc5/0x160 [ 31.815352] __sys_sendmsg+0x11d/0x290 [ 31.819236] ? __ia32_sys_shutdown+0x80/0x80 [ 31.823629] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.829145] ? __do_page_fault+0x449/0xe50 [ 31.833364] ? syscall_slow_exit_work+0x500/0x500 [ 31.838186] __x64_sys_sendmsg+0x78/0xb0 [ 31.842227] do_syscall_64+0x1b9/0x820 [ 31.846096] ? syscall_return_slowpath+0x5e0/0x5e0 [ 31.851005] ? syscall_return_slowpath+0x31d/0x5e0 [ 31.855925] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.861441] ? retint_user+0x18/0x18 [ 31.865135] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.869957] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.875186] RIP: 0033:0x441109 [ 31.878356] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 31.897441] RSP: 002b:00007ffd2c44eb68 EFLAGS: 00000213 ORIG_RAX: 000000000000002e [ 31.905127] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000441109 [ 31.912374] RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000003 [ 31.919621] RBP: 00000000006cc018 R08: 00000000000001