[ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.29' (ECDSA) to the list of known hosts. 2020/08/27 05:37:31 parsed 1 programs 2020/08/27 05:37:31 executed programs: 0 syzkaller login: [ 60.602955][ T6872] IPVS: ftp: loaded support on port[0] = 21 [ 60.739121][ T6872] chnl_net:caif_netlink_parms(): no params data found [ 60.789785][ T6872] bridge0: port 1(bridge_slave_0) entered blocking state [ 60.797923][ T6872] bridge0: port 1(bridge_slave_0) entered disabled state [ 60.805662][ T6872] device bridge_slave_0 entered promiscuous mode [ 60.815893][ T6872] bridge0: port 2(bridge_slave_1) entered blocking state [ 60.823830][ T6872] bridge0: port 2(bridge_slave_1) entered disabled state [ 60.832474][ T6872] device bridge_slave_1 entered promiscuous mode [ 60.852835][ T6872] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 60.863615][ T6872] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 60.885956][ T6872] team0: Port device team_slave_0 added [ 60.893261][ T6872] team0: Port device team_slave_1 added [ 60.911768][ T6872] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 60.918799][ T6872] batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. [ 60.945424][ T6872] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 60.959161][ T6872] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 60.966088][ T6872] batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. [ 60.992729][ T6872] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 61.019461][ T6872] device hsr_slave_0 entered promiscuous mode [ 61.026063][ T6872] device hsr_slave_1 entered promiscuous mode [ 61.119611][ T6872] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 61.133939][ T6872] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 61.142866][ T6872] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 61.155933][ T6872] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 61.180867][ T6872] bridge0: port 2(bridge_slave_1) entered blocking state [ 61.188013][ T6872] bridge0: port 2(bridge_slave_1) entered forwarding state [ 61.195573][ T6872] bridge0: port 1(bridge_slave_0) entered blocking state [ 61.202696][ T6872] bridge0: port 1(bridge_slave_0) entered forwarding state [ 61.253558][ T6872] 8021q: adding VLAN 0 to HW filter on device bond0 [ 61.267576][ T43] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 61.278769][ T43] bridge0: port 1(bridge_slave_0) entered disabled state [ 61.286665][ T43] bridge0: port 2(bridge_slave_1) entered disabled state [ 61.295419][ T43] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 61.308271][ T6872] 8021q: adding VLAN 0 to HW filter on device team0 [ 61.320466][ T3121] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 61.329313][ T3121] bridge0: port 1(bridge_slave_0) entered blocking state [ 61.336358][ T3121] bridge0: port 1(bridge_slave_0) entered forwarding state [ 61.361070][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 61.370255][ T5] bridge0: port 2(bridge_slave_1) entered blocking state [ 61.377371][ T5] bridge0: port 2(bridge_slave_1) entered forwarding state [ 61.385473][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 61.395431][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 61.411371][ T6872] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 61.422851][ T6872] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 61.435826][ T2852] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 61.444022][ T2852] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 61.452939][ T2852] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 61.462976][ T2852] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 61.479707][ T43] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 61.487865][ T43] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 61.502764][ T6872] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 61.520822][ T2852] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 61.541041][ T43] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 61.549899][ T43] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 61.558712][ T43] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 61.571297][ T6872] device veth0_vlan entered promiscuous mode [ 61.582705][ T6872] device veth1_vlan entered promiscuous mode [ 61.604830][ T2852] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 61.613858][ T2852] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 61.622490][ T2852] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 61.633607][ T6872] device veth0_macvtap entered promiscuous mode [ 61.643976][ T6872] device veth1_macvtap entered promiscuous mode [ 61.662432][ T6872] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 61.670679][ T2852] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 61.680164][ T2852] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 61.692946][ T6872] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 61.700397][ T43] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 61.711777][ T6872] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 61.723606][ T6872] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 61.733437][ T6872] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 61.742850][ T6872] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 62.013215][ T7108] ------------[ cut here ]------------ [ 62.018698][ T7108] ODEBUG: free active (active state 1) object type: rcu_head hint: 0x0 [ 62.027181][ T7108] WARNING: CPU: 1 PID: 7108 at lib/debugobjects.c:485 debug_print_object+0x160/0x250 [ 62.036622][ T7108] Kernel panic - not syncing: panic_on_warn set ... [ 62.043191][ T7108] CPU: 1 PID: 7108 Comm: syz-executor.0 Not tainted 5.9.0-rc2-syzkaller #0 [ 62.051746][ T7108] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.061820][ T7108] Call Trace: [ 62.065092][ T7108] dump_stack+0x18f/0x20d [ 62.069400][ T7108] panic+0x2e3/0x75c [ 62.073271][ T7108] ? __warn_printk+0xf3/0xf3 [ 62.077953][ T7108] ? console_unlock+0x7f0/0xf30 [ 62.082817][ T7108] ? __warn.cold+0x5/0x4a [ 62.087121][ T7108] ? __warn+0xd6/0x1f2 [ 62.091164][ T7108] ? debug_print_object+0x160/0x250 [ 62.096373][ T7108] __warn.cold+0x20/0x4a [ 62.100593][ T7108] ? debug_print_object+0x160/0x250 [ 62.105770][ T7108] report_bug+0x1bd/0x210 [ 62.110092][ T7108] handle_bug+0x38/0x90 [ 62.114222][ T7108] ? __warn_printk+0xc6/0xf3 [ 62.118786][ T7108] exc_invalid_op+0x14/0x40 [ 62.123265][ T7108] asm_exc_invalid_op+0x12/0x20 [ 62.128093][ T7108] RIP: 0010:debug_print_object+0x160/0x250 [ 62.133871][ T7108] Code: dd e0 26 94 88 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 bf 00 00 00 48 8b 14 dd e0 26 94 88 48 c7 c7 40 1c 94 88 e8 d2 36 a6 fd <0f> 0b 83 05 93 4f 13 07 01 48 83 c4 20 5b 5d 41 5c 41 5d c3 48 89 [ 62.153449][ T7108] RSP: 0018:ffffc900068a7b80 EFLAGS: 00010086 [ 62.159488][ T7108] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 62.167441][ T7108] RDX: ffff888090f64140 RSI: ffffffff815dafc7 RDI: fffff52000d14f62 [ 62.175408][ T7108] RBP: 0000000000000001 R08: 0000000000000001 R09: ffff8880ae720f8b [ 62.183369][ T7108] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff89bd6780 [ 62.191316][ T7108] R13: 0000000000000000 R14: dead000000000100 R15: dffffc0000000000 [ 62.199274][ T7108] ? vprintk_func+0x97/0x1a6 [ 62.203846][ T7108] debug_check_no_obj_freed+0x301/0x41c [ 62.209370][ T7108] kmem_cache_free.part.0+0x16d/0x1f0 [ 62.214716][ T7108] task_work_run+0xdd/0x190 [ 62.219196][ T7108] get_signal+0xd89/0x1f00 [ 62.223586][ T7108] ? fput_many+0xf6/0x1a0 [ 62.227898][ T7108] ? do_epoll_ctl+0x1db/0x3100 [ 62.232653][ T7108] arch_do_signal+0x82/0x2520 [ 62.237309][ T7108] ? lock_downgrade+0x830/0x830 [ 62.242133][ T7108] ? __ia32_sys_epoll_create+0x1e0/0x1e0 [ 62.247737][ T7108] ? copy_siginfo_to_user32+0xa0/0xa0 [ 62.253101][ T7108] ? ep_unregister_pollwait.constprop.0+0x3c0/0x3c0 [ 62.259663][ T7108] ? __might_fault+0x190/0x1d0 [ 62.264403][ T7108] ? exit_to_user_mode_prepare+0xb9/0x1c0 [ 62.270116][ T7108] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 62.276072][ T7108] exit_to_user_mode_prepare+0x15d/0x1c0 [ 62.281681][ T7108] syscall_exit_to_user_mode+0x59/0x2b0 [ 62.287202][ T7108] __do_fast_syscall_32+0x63/0x80 [ 62.292216][ T7108] do_fast_syscall_32+0x2f/0x70 [ 62.297130][ T7108] entry_SYSENTER_compat_after_hwframe+0x4d/0x5c [ 62.303451][ T7108] RIP: 0023:0xf7f05549 [ 62.307495][ T7108] Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 62.327086][ T7108] RSP: 002b:00000000f76ff0cc EFLAGS: 00000296 ORIG_RAX: 00000000000000ff [ 62.335584][ T7108] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000000001 [ 62.343531][ T7108] RDX: 0000000000000006 RSI: 0000000020000000 RDI: 0000000000000000 [ 62.351479][ T7108] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 62.359426][ T7108] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 62.367370][ T7108] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 62.376525][ T7108] Kernel Offset: disabled [ 62.380922][ T7108] Rebooting in 86400 seconds..