[ 33.534309][ T27] audit: type=1800 audit(1555818502.878:27): pid=7327 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 33.556952][ T27] audit: type=1800 audit(1555818502.878:28): pid=7327 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.274042][ T27] audit: type=1800 audit(1555818503.668:29): pid=7327 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 34.294371][ T27] audit: type=1800 audit(1555818503.668:30): pid=7327 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.15.207' (ECDSA) to the list of known hosts. syzkaller login: [ 44.722814][ T7480] IPVS: ftp: loaded support on port[0] = 21 [ 44.783173][ T7480] chnl_net:caif_netlink_parms(): no params data found [ 44.812272][ T7480] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.820055][ T7480] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.827866][ T7480] device bridge_slave_0 entered promiscuous mode [ 44.836218][ T7480] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.843308][ T7480] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.851061][ T7480] device bridge_slave_1 entered promiscuous mode [ 44.867263][ T7480] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 44.876681][ T7480] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 44.893280][ T7480] team0: Port device team_slave_0 added [ 44.900942][ T7480] team0: Port device team_slave_1 added [ 44.966763][ T7480] device hsr_slave_0 entered promiscuous mode [ 45.005625][ T7480] device hsr_slave_1 entered promiscuous mode [ 45.051904][ T7480] bridge0: port 2(bridge_slave_1) entered blocking state [ 45.059120][ T7480] bridge0: port 2(bridge_slave_1) entered forwarding state [ 45.066892][ T7480] bridge0: port 1(bridge_slave_0) entered blocking state [ 45.074070][ T7480] bridge0: port 1(bridge_slave_0) entered forwarding state [ 45.103102][ T7480] 8021q: adding VLAN 0 to HW filter on device bond0 [ 45.116065][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 45.138471][ T5] bridge0: port 1(bridge_slave_0) entered disabled state [ 45.147182][ T5] bridge0: port 2(bridge_slave_1) entered disabled state [ 45.155613][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 45.167656][ T7480] 8021q: adding VLAN 0 to HW filter on device team0 [ 45.177137][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 45.186202][ T5] bridge0: port 1(bridge_slave_0) entered blocking state [ 45.193247][ T5] bridge0: port 1(bridge_slave_0) entered forwarding state [ 45.203178][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 45.211926][ T22] bridge0: port 2(bridge_slave_1) entered blocking state [ 45.219293][ T22] bridge0: port 2(bridge_slave_1) entered forwarding state [ 45.236632][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 45.245489][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 45.256983][ T7482] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 45.264824][ T7482] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 45.276125][ T2987] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 45.285563][ T7480] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready executing program [ 45.302519][ T7480] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 45.361465][ T7485] ------------[ cut here ]------------ [ 45.367061][ T7485] percpu_ref_kill_and_confirm called more than once on io_ring_ctx_ref_free! [ 45.367269][ T7485] WARNING: CPU: 1 PID: 7485 at lib/percpu-refcount.c:335 percpu_ref_kill_and_confirm+0x341/0x3b0 [ 45.386474][ T7485] Kernel panic - not syncing: panic_on_warn set ... [ 45.393039][ T7485] CPU: 1 PID: 7485 Comm: syz-executor743 Not tainted 5.1.0-rc5+ #78 [ 45.401006][ T7485] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.411046][ T7485] Call Trace: [ 45.414505][ T7485] dump_stack+0x172/0x1f0 [ 45.418890][ T7485] ? percpu_ref_kill_and_confirm+0x340/0x3b0 [ 45.424967][ T7485] panic+0x2cb/0x65c [ 45.428867][ T7485] ? __warn_printk+0xf3/0xf3 [ 45.433436][ T7485] ? percpu_ref_kill_and_confirm+0x341/0x3b0 [ 45.439560][ T7485] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.445781][ T7485] ? __warn.cold+0x5/0x45 [ 45.450088][ T7485] ? __warn+0xe8/0x1d0 [ 45.454134][ T7485] ? percpu_ref_kill_and_confirm+0x341/0x3b0 [ 45.460103][ T7485] __warn.cold+0x20/0x45 [ 45.464326][ T7485] ? vprintk_emit+0x1ce/0x6d0 [ 45.468989][ T7485] ? percpu_ref_kill_and_confirm+0x341/0x3b0 [ 45.474950][ T7485] report_bug+0x263/0x2b0 [ 45.479257][ T7485] do_error_trap+0x11b/0x200 [ 45.483931][ T7485] do_invalid_op+0x37/0x50 [ 45.488336][ T7485] ? percpu_ref_kill_and_confirm+0x341/0x3b0 [ 45.494292][ T7485] invalid_op+0x14/0x20 [ 45.498431][ T7485] RIP: 0010:percpu_ref_kill_and_confirm+0x341/0x3b0 [ 45.504998][ T7485] Code: 42 e0 2a 06 01 48 89 fa 48 c1 ea 03 80 3c 02 00 75 76 49 8b 54 24 10 48 c7 c6 a0 71 a1 87 48 c7 c7 40 71 a1 87 e8 ad 92 13 fe <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 [ 45.524801][ T7485] RSP: 0018:ffff88809668fcf0 EFLAGS: 00010082 [ 45.530853][ T7485] RAX: 0000000000000000 RBX: 0000607f514683db RCX: 0000000000000000 [ 45.538806][ T7485] RDX: 0000000000000000 RSI: ffffffff815afcf6 RDI: ffffed1012cd1f90 [ 45.546759][ T7485] RBP: ffff88809668fd20 R08: ffff88808fcbe580 R09: fffffbfff1133639 [ 45.554711][ T7485] R10: fffffbfff1133638 R11: ffffffff8899b1c3 R12: ffff888094b68240 [ 45.562669][ T7485] R13: ffff888094b68248 R14: 0000000000000286 R15: 0000000000000000 [ 45.570644][ T7485] ? vprintk_func+0x86/0x189 [ 45.575219][ T7485] __io_uring_register+0xa7/0x1fe0 [ 45.580305][ T7485] ? __mutex_lock+0x3cd/0x1310 [ 45.585119][ T7485] ? __x64_sys_io_uring_register+0x182/0x1f0 [ 45.591082][ T7485] ? mutex_trylock+0x1e0/0x1e0 [ 45.595834][ T7485] ? io_sq_wq_submit_work+0x10f0/0x10f0 [ 45.601369][ T7485] ? kasan_check_write+0x14/0x20 [ 45.606298][ T7485] __x64_sys_io_uring_register+0x193/0x1f0 [ 45.612085][ T7485] do_syscall_64+0x103/0x610 [ 45.616755][ T7485] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 45.622621][ T7485] RIP: 0033:0x447699 [ 45.626494][ T7485] Code: e8 7c 1a 03 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 8b 0e fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 45.646194][ T7485] RSP: 002b:00007fa965007ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab [ 45.654582][ T7485] RAX: ffffffffffffffda RBX: 00000000006ddc38 RCX: 0000000000447699 [ 45.662536][ T7485] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 [ 45.670481][ T7485] RBP: 00000000006ddc30 R08: 00007fa965008700 R09: 0000000000000000 [ 45.678530][ T7485] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006ddc3c [ 45.686487][ T7485] R13: 00007ffc60216f2f R14: 00007fa9650089c0 R15: 0000000000000002 [ 45.695729][ T7485] Kernel Offset: disabled [ 45.700316][ T7485] Rebooting in 86400 seconds..