[ 65.617265][ T26] audit: type=1804 audit(1569358136.351:50): pid=9117 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=invalid_pcr cause=ToMToU comm="init" name="/run/utmp" dev="sda1" ino=1421 res=1 [ 65.617290][ T26] audit: type=1804 audit(1569358136.361:51): pid=9116 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=invalid_pcr cause=ToMToU comm="init" name="/run/utmp" dev="sda1" ino=1421 res=1 [ 65.617312][ T26] audit: type=1804 audit(1569358136.361:52): pid=9122 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=invalid_pcr cause=ToMToU comm="getty" name="/run/utmp" dev="sda1" ino=1421 res=1 [ 65.617337][ T26] audit: type=1804 audit(1569358136.371:53): pid=9121 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=invalid_pcr cause=open_writers comm="getty" name="/run/utmp" dev="sda1" ino=1421 res=1 [ 65.617362][ T26] audit: type=1804 audit(1569358136.371:54): pid=9119 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=invalid_pcr cause=open_writers comm="getty" name="/run/utmp" dev="sda1" ino=1421 res=1 [ 65.617386][ T26] audit: type=1804 audit(1569358136.371:55): pid=9117 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=invalid_pcr cause=open_writers comm="getty" name="/run/utmp" dev="sda1" ino=1421 res=1 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.23' (ECDSA) to the list of known hosts. syzkaller login: [ 75.089671][ T26] kauditd_printk_skb: 11 callbacks suppressed [ 75.089686][ T26] audit: type=1400 audit(1569358145.901:67): avc: denied { map } for pid=9141 comm="syz-executor490" path="/root/syz-executor490863904" dev="sda1" ino=16501 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 75.125567][ T9142] IPVS: ftp: loaded support on port[0] = 21 [ 75.179815][ T9142] chnl_net:caif_netlink_parms(): no params data found [ 75.209073][ T9142] bridge0: port 1(bridge_slave_0) entered blocking state [ 75.216732][ T9142] bridge0: port 1(bridge_slave_0) entered disabled state [ 75.224654][ T9142] device bridge_slave_0 entered promiscuous mode [ 75.233062][ T9142] bridge0: port 2(bridge_slave_1) entered blocking state [ 75.240187][ T9142] bridge0: port 2(bridge_slave_1) entered disabled state [ 75.248008][ T9142] device bridge_slave_1 entered promiscuous mode [ 75.265924][ T9142] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 75.276390][ T9142] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 75.295162][ T9142] team0: Port device team_slave_0 added [ 75.301957][ T9142] team0: Port device team_slave_1 added [ 75.384611][ T9142] device hsr_slave_0 entered promiscuous mode [ 75.442347][ T9142] device hsr_slave_1 entered promiscuous mode [ 75.530195][ T9142] bridge0: port 2(bridge_slave_1) entered blocking state [ 75.537446][ T9142] bridge0: port 2(bridge_slave_1) entered forwarding state [ 75.545252][ T9142] bridge0: port 1(bridge_slave_0) entered blocking state [ 75.552393][ T9142] bridge0: port 1(bridge_slave_0) entered forwarding state [ 75.587705][ T9142] 8021q: adding VLAN 0 to HW filter on device bond0 [ 75.600907][ T3009] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 75.620927][ T3009] bridge0: port 1(bridge_slave_0) entered disabled state [ 75.629610][ T3009] bridge0: port 2(bridge_slave_1) entered disabled state [ 75.638580][ T3009] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 75.649582][ T9142] 8021q: adding VLAN 0 to HW filter on device team0 [ 75.660932][ T3009] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 75.669597][ T3009] bridge0: port 1(bridge_slave_0) entered blocking state [ 75.676737][ T3009] bridge0: port 1(bridge_slave_0) entered forwarding state [ 75.688214][ T3003] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 75.697719][ T3003] bridge0: port 2(bridge_slave_1) entered blocking state [ 75.704813][ T3003] bridge0: port 2(bridge_slave_1) entered forwarding state [ 75.724547][ T3009] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 75.733719][ T3009] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 75.747695][ T9142] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 75.758633][ T9142] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 75.770523][ T3009] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 75.778702][ T3009] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready executing program [ 75.787492][ T3009] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 75.796333][ T3009] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 75.814887][ T9142] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 75.853147][ T9142] netlink: 80 bytes leftover after parsing attributes in process `syz-executor490'. [ 75.863145][ T9142] netlink: 48 bytes leftover after parsing attributes in process `syz-executor490'. [ 75.874287][ T9142] [ 75.876709][ T9142] ============================= [ 75.881530][ T9142] WARNING: suspicious RCU usage [ 75.886409][ T9142] 5.3.0+ #0 Not tainted [ 75.890551][ T9142] ----------------------------- [ 75.895442][ T9142] include/net/sch_generic.h:492 suspicious rcu_dereference_check() usage! [ 75.903945][ T9142] [ 75.903945][ T9142] other info that might help us debug this: [ 75.903945][ T9142] [ 75.914187][ T9142] [ 75.914187][ T9142] rcu_scheduler_active = 2, debug_locks = 1 [ 75.922272][ T9142] 3 locks held by syz-executor490/9142: [ 75.927799][ T9142] #0: ffffffff88fab2c0 (rcu_read_lock_bh){....}, at: ip_finish_output2+0x2dc/0x2570 [ 75.937289][ T9142] #1: ffffffff88fab2c0 (rcu_read_lock_bh){....}, at: __dev_queue_xmit+0x20a/0x36f0 [ 75.946789][ T9142] #2: ffff88808985e700 (&(&sch->q.lock)->rlock){+...}, at: __dev_queue_xmit+0x14b0/0x36f0 [ 75.956798][ T9142] [ 75.956798][ T9142] stack backtrace: [ 75.962733][ T9142] CPU: 0 PID: 9142 Comm: syz-executor490 Not tainted 5.3.0+ #0 [ 75.970370][ T9142] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 75.980414][ T9142] Call Trace: [ 75.983697][ T9142] dump_stack+0x172/0x1f0 [ 75.988016][ T9142] lockdep_rcu_suspicious+0x153/0x15d [ 75.993374][ T9142] netem_enqueue+0x1cfb/0x2d80 [ 75.998117][ T9142] ? lock_acquire+0x190/0x410 [ 76.002775][ T9142] ? __dev_queue_xmit+0x14b0/0x36f0 [ 76.007966][ T9142] __dev_queue_xmit+0x157e/0x36f0 [ 76.012985][ T9142] ? __kasan_check_read+0x11/0x20 [ 76.018006][ T9142] ? netdev_core_pick_tx+0x2f0/0x2f0 [ 76.023289][ T9142] ? match_held_lock+0x450/0x510 [ 76.028210][ T9142] ? __ip_finish_output+0x5fc/0xb90 [ 76.033407][ T9142] ? lock_downgrade+0x920/0x920 [ 76.038239][ T9142] ? ip_finish_output2+0x13e2/0x2570 [ 76.043512][ T9142] ? __ip_finish_output+0x5fc/0xb90 [ 76.048703][ T9142] ? ip_finish_output2+0x13e2/0x2570 [ 76.053986][ T9142] dev_queue_xmit+0x18/0x20 [ 76.058480][ T9142] ? dev_queue_xmit+0x18/0x20 [ 76.063138][ T9142] ip_finish_output2+0x1726/0x2570 [ 76.068234][ T9142] ? nf_ct_deliver_cached_events+0x23d/0x6e0 [ 76.074202][ T9142] ? ip_frag_next+0x910/0x910 [ 76.078861][ T9142] ? ip_mc_output+0xb31/0xf40 [ 76.083523][ T9142] __ip_finish_output+0x5fc/0xb90 [ 76.088533][ T9142] ? __ip_finish_output+0x5fc/0xb90 [ 76.094059][ T9142] ? audit_tag_tree+0x5d0/0xef0 [ 76.098895][ T9142] ip_finish_output+0x38/0x1f0 [ 76.103640][ T9142] ip_mc_output+0x292/0xf40 [ 76.108135][ T9142] ? __ip_queue_xmit+0x1be0/0x1be0 [ 76.113229][ T9142] ? __ip_finish_output+0xb90/0xb90 [ 76.118410][ T9142] ? ip_make_skb+0x1b1/0x2c0 [ 76.122981][ T9142] ? ip_reply_glue_bits+0xc0/0xc0 [ 76.127998][ T9142] ip_local_out+0xbb/0x190 [ 76.132400][ T9142] ip_send_skb+0x42/0xf0 [ 76.136625][ T9142] udp_send_skb.isra.0+0x6b2/0x1160 [ 76.141815][ T9142] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 76.148134][ T9142] udp_sendmsg+0x1e96/0x2820 [ 76.152720][ T9142] ? __kasan_check_read+0x11/0x20 [ 76.158077][ T9142] ? ip_reply_glue_bits+0xc0/0xc0 [ 76.163089][ T9142] ? udp_unicast_rcv_skb.isra.0+0x360/0x360 [ 76.169052][ T9142] ? find_held_lock+0x35/0x130 [ 76.173809][ T9142] ? __might_fault+0x12b/0x1e0 [ 76.178571][ T9142] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 76.184799][ T9142] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 76.190687][ T9142] ? tomoyo_socket_bind_permission+0x360/0x360 [ 76.196824][ T9142] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 76.203051][ T9142] ? copy_msghdr_from_user+0x2da/0x440 [ 76.208496][ T9142] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 76.214647][ T9142] inet_sendmsg+0x9e/0xe0 [ 76.218988][ T9142] ? inet_sendmsg+0x9e/0xe0 [ 76.223471][ T9142] ? inet_send_prepare+0x4f0/0x4f0 [ 76.228565][ T9142] sock_sendmsg+0xd7/0x130 [ 76.232965][ T9142] ___sys_sendmsg+0x3e2/0x920 [ 76.237628][ T9142] ? copy_msghdr_from_user+0x440/0x440 [ 76.243070][ T9142] ? __kasan_check_read+0x11/0x20 [ 76.248089][ T9142] ? __kasan_check_read+0x11/0x20 [ 76.253096][ T9142] ? __lock_acquire+0x1703/0x4e70 [ 76.258104][ T9142] ? mark_held_locks+0xf0/0xf0 [ 76.262864][ T9142] ? __might_fault+0x12b/0x1e0 [ 76.267608][ T9142] ? find_held_lock+0x35/0x130 [ 76.272357][ T9142] ? __might_fault+0x12b/0x1e0 [ 76.277106][ T9142] ? lock_downgrade+0x920/0x920 [ 76.281945][ T9142] ? ___might_sleep+0x163/0x2c0 [ 76.286778][ T9142] __sys_sendmmsg+0x1bf/0x4d0 [ 76.291438][ T9142] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 76.296451][ T9142] ? release_sock+0x156/0x1c0 [ 76.301115][ T9142] ? __sys_connect+0x12d/0x330 [ 76.305864][ T9142] ? __ia32_sys_accept+0xb0/0xb0 [ 76.310794][ T9142] ? trace_hardirqs_on_thunk+0x1a/0x20 [ 76.316234][ T9142] ? trace_hardirqs_on_thunk+0x1a/0x20 [ 76.321677][ T9142] ? do_syscall_64+0x26/0x760 [ 76.326362][ T9142] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 76.332420][ T9142] ? do_syscall_64+0x26/0x760 [ 76.337091][ T9142] __x64_sys_sendmmsg+0x9d/0x100 [ 76.342452][ T9142] do_syscall_64+0xfa/0x760 [ 76.346967][ T9142] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 76.352849][ T9142] RIP: 0033:0x441b59 [ 76.356734][ T9142] 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 7b 10 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 76.376329][ T9142] RSP: 002b:00007fffcc63a6f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 76.384739][ T9142] RAX: ffffffffffffffda RBX: 0000315f6576616c RCX: 0000000000441b59 [ 76.392697][ T9142] RDX: 04000000000001a8 RSI: 0000000020007fc0 RDI: 0000000000000005 [ 76.400655][ T9142] RBP: 735f656764697262 R08: 0000000001bbbbbb R09: 0000000001bbbbbb [ 76.408638][ T9142] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 76.416594][ T9142] R13: 00000000004030f0 R14: 0000000000000000 R15: 0000000000000000