[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 59.495812][ T25] audit: type=1800 audit(1575141752.545:25): pid=8960 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 59.515693][ T25] audit: type=1800 audit(1575141752.545:26): pid=8960 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 59.564604][ T25] audit: type=1800 audit(1575141752.555:27): pid=8960 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 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. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.65' (ECDSA) to the list of known hosts. 2019/11/30 19:37:45 parsed 1 programs 2019/11/30 19:37:46 executed programs: 0 syzkaller login: [ 973.846492][ T9127] IPVS: ftp: loaded support on port[0] = 21 [ 973.912633][ T9127] chnl_net:caif_netlink_parms(): no params data found [ 973.941367][ T9127] bridge0: port 1(bridge_slave_0) entered blocking state [ 973.949195][ T9127] bridge0: port 1(bridge_slave_0) entered disabled state [ 973.957173][ T9127] device bridge_slave_0 entered promiscuous mode [ 973.966581][ T9127] bridge0: port 2(bridge_slave_1) entered blocking state [ 973.974036][ T9127] bridge0: port 2(bridge_slave_1) entered disabled state [ 973.981718][ T9127] device bridge_slave_1 entered promiscuous mode [ 974.000518][ T9127] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 974.011514][ T9127] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 974.031550][ T9127] team0: Port device team_slave_0 added [ 974.039360][ T9127] team0: Port device team_slave_1 added [ 974.116482][ T9127] device hsr_slave_0 entered promiscuous mode [ 974.174067][ T9127] device hsr_slave_1 entered promiscuous mode [ 974.278785][ T9127] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 974.316371][ T9127] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 974.356231][ T9127] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 974.396186][ T9127] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 974.454583][ T9127] bridge0: port 2(bridge_slave_1) entered blocking state [ 974.462480][ T9127] bridge0: port 2(bridge_slave_1) entered forwarding state [ 974.471412][ T9127] bridge0: port 1(bridge_slave_0) entered blocking state [ 974.478526][ T9127] bridge0: port 1(bridge_slave_0) entered forwarding state [ 974.521366][ T9127] 8021q: adding VLAN 0 to HW filter on device bond0 [ 974.536549][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 974.547766][ T17] bridge0: port 1(bridge_slave_0) entered disabled state [ 974.567180][ T17] bridge0: port 2(bridge_slave_1) entered disabled state [ 974.576109][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 974.589757][ T9127] 8021q: adding VLAN 0 to HW filter on device team0 [ 974.611016][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 974.619494][ T5] bridge0: port 1(bridge_slave_0) entered blocking state [ 974.627673][ T5] bridge0: port 1(bridge_slave_0) entered forwarding state [ 974.647488][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 974.656343][ T17] bridge0: port 2(bridge_slave_1) entered blocking state [ 974.663777][ T17] bridge0: port 2(bridge_slave_1) entered forwarding state [ 974.672199][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 974.681680][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 974.694282][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 974.706820][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 974.719729][ T9127] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 974.731413][ T9127] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 974.740111][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 974.757460][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 974.765619][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 974.778903][ T9127] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 976.744248][ T9419] ------------[ cut here ]------------ [ 976.750073][ T9419] refcount_t: underflow; use-after-free. [ 976.762727][ T9419] WARNING: CPU: 1 PID: 9419 at lib/refcount.c:28 refcount_warn_saturate+0x1dc/0x1f0 [ 976.772239][ T9419] Kernel panic - not syncing: panic_on_warn set ... [ 976.780510][ T9419] CPU: 1 PID: 9419 Comm: syz-executor.0 Not tainted 5.4.0-syzkaller #0 [ 976.789759][ T9419] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 976.800245][ T9419] Call Trace: [ 976.803613][ T9419] dump_stack+0x197/0x210 [ 976.807943][ T9419] ? refcount_warn_saturate+0x1b0/0x1f0 [ 976.814655][ T9419] panic+0x2e3/0x75c [ 976.818626][ T9419] ? add_taint.cold+0x16/0x16 [ 976.823372][ T9419] ? __kasan_check_write+0x14/0x20 [ 976.828827][ T9419] ? __warn.cold+0x14/0x3e [ 976.833235][ T9419] ? __warn+0xd9/0x1cf [ 976.837795][ T9419] ? refcount_warn_saturate+0x1dc/0x1f0 [ 976.843950][ T9419] __warn.cold+0x2f/0x3e [ 976.848448][ T9419] ? refcount_warn_saturate+0x1dc/0x1f0 [ 976.854033][ T9419] report_bug+0x289/0x300 [ 976.858423][ T9419] do_error_trap+0x11b/0x200 [ 976.864083][ T9419] do_invalid_op+0x37/0x50 [ 976.868499][ T9419] ? refcount_warn_saturate+0x1dc/0x1f0 [ 976.874092][ T9419] invalid_op+0x23/0x30 [ 976.878395][ T9419] RIP: 0010:refcount_warn_saturate+0x1dc/0x1f0 [ 976.884644][ T9419] Code: e9 d8 fe ff ff 48 89 df e8 31 65 25 fe e9 85 fe ff ff e8 07 37 e8 fd 48 c7 c7 60 53 4f 88 c6 05 7d b6 a5 06 01 e8 73 eb b8 fd <0f> 0b e9 ac fe ff ff 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 [ 976.905199][ T9419] RSP: 0018:ffff88808963fd50 EFLAGS: 00010286 [ 976.911269][ T9419] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 976.919264][ T9419] RDX: 0000000000000000 RSI: ffffffff815e4316 RDI: ffffed10112c7f9c [ 976.927582][ T9419] RBP: ffff88808963fd60 R08: ffff8880977a64c0 R09: ffffed1015d26621 [ 976.935650][ T9419] R10: ffffed1015d26620 R11: ffff8880ae933107 R12: 0000000000000003 [ 976.943701][ T9419] R13: 0000000000000000 R14: ffff8880965c0100 R15: ffff888094244a98 [ 976.951806][ T9419] ? vprintk_func+0x86/0x189 [ 976.956442][ T9419] smc_release+0x445/0x520 [ 976.960931][ T9419] __sock_release+0xce/0x280 [ 976.965616][ T9419] sock_close+0x1e/0x30 [ 976.969857][ T9419] __fput+0x2ff/0x890 [ 976.973845][ T9419] ? __sock_release+0x280/0x280 [ 976.978688][ T9419] ____fput+0x16/0x20 [ 976.982899][ T9419] task_work_run+0x145/0x1c0 [ 976.987502][ T9419] exit_to_usermode_loop+0x316/0x380 [ 976.992793][ T9419] do_syscall_64+0x676/0x790 [ 976.997378][ T9419] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 977.003269][ T9419] RIP: 0033:0x414211 [ 977.007173][ T9419] Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 [ 977.026768][ T9419] RSP: 002b:00007ffc46c3b260 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 977.035555][ T9419] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000414211 [ 977.043511][ T9419] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 [ 977.051467][ T9419] RBP: 0000000000000000 R08: ffffffffffffffff R09: ffffffffffffffff [ 977.059420][ T9419] R10: 00007ffc46c3b340 R11: 0000000000000293 R12: 000000000075bfc8 [ 977.067414][ T9419] R13: 00000000000ee743 R14: 0000000000760458 R15: 000000000075bfd4 [ 977.077008][ T9419] Kernel Offset: disabled [ 977.081430][ T9419] Rebooting in 86400 seconds..