Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.50' (ECDSA) to the list of known hosts. syzkaller login: [ 54.838473][ T6864] IPVS: ftp: loaded support on port[0] = 21 [ 54.920082][ T6864] chnl_net:caif_netlink_parms(): no params data found [ 54.970221][ T6864] bridge0: port 1(bridge_slave_0) entered blocking state [ 54.977629][ T6864] bridge0: port 1(bridge_slave_0) entered disabled state [ 54.985185][ T6864] device bridge_slave_0 entered promiscuous mode [ 54.993918][ T6864] bridge0: port 2(bridge_slave_1) entered blocking state [ 55.002071][ T6864] bridge0: port 2(bridge_slave_1) entered disabled state [ 55.010200][ T6864] device bridge_slave_1 entered promiscuous mode [ 55.029450][ T6864] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 55.040120][ T6864] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 55.063055][ T6864] team0: Port device team_slave_0 added [ 55.070402][ T6864] team0: Port device team_slave_1 added [ 55.088207][ T6864] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 55.095470][ T6864] 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. [ 55.122658][ T6864] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 55.135521][ T6864] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 55.142481][ T6864] 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. [ 55.168471][ T6864] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 55.193866][ T6864] device hsr_slave_0 entered promiscuous mode [ 55.200525][ T6864] device hsr_slave_1 entered promiscuous mode [ 55.289605][ T6864] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 55.299266][ T6864] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 55.309971][ T6864] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 55.319458][ T6864] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 55.343126][ T6864] bridge0: port 2(bridge_slave_1) entered blocking state [ 55.350405][ T6864] bridge0: port 2(bridge_slave_1) entered forwarding state [ 55.358237][ T6864] bridge0: port 1(bridge_slave_0) entered blocking state [ 55.365402][ T6864] bridge0: port 1(bridge_slave_0) entered forwarding state [ 55.408153][ T6864] 8021q: adding VLAN 0 to HW filter on device bond0 [ 55.420697][ T6598] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 55.430933][ T6598] bridge0: port 1(bridge_slave_0) entered disabled state [ 55.440134][ T6598] bridge0: port 2(bridge_slave_1) entered disabled state [ 55.448193][ T6598] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 55.460609][ T6864] 8021q: adding VLAN 0 to HW filter on device team0 [ 55.472183][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 55.481013][ T12] bridge0: port 1(bridge_slave_0) entered blocking state [ 55.488237][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state [ 55.506057][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 55.514354][ T23] bridge0: port 2(bridge_slave_1) entered blocking state [ 55.521456][ T23] bridge0: port 2(bridge_slave_1) entered forwarding state [ 55.544114][ T6864] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 55.554772][ T6864] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 55.568625][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 55.578524][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 55.587989][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 55.596990][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 55.606149][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 55.613757][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 55.633326][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 55.640830][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 55.654478][ T6864] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 55.673730][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 55.692780][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 55.701498][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 55.709857][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 55.721501][ T6864] device veth0_vlan entered promiscuous mode [ 55.732474][ T6864] device veth1_vlan entered promiscuous mode [ 55.751870][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 55.760639][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 55.768879][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 55.779464][ T6864] device veth0_macvtap entered promiscuous mode [ 55.789974][ T6864] device veth1_macvtap entered promiscuous mode [ 55.808278][ T6864] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 55.816237][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 55.826655][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 55.839286][ T6864] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 55.847212][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 55.859146][ T6864] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 executing program [ 55.869460][ T6864] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 55.878280][ T6864] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 55.887038][ T6864] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 55.927505][ T7073] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 55.935327][ T7073] #PF: supervisor instruction fetch in kernel mode [ 55.941817][ T7073] #PF: error_code(0x0010) - not-present page [ 55.947764][ T7073] PGD 9ea13067 P4D 9ea13067 PUD 99dd0067 PMD 0 [ 55.954044][ T7073] Oops: 0010 [#1] PREEMPT SMP KASAN [ 55.959217][ T7073] CPU: 0 PID: 7073 Comm: io_wqe_worker-0 Not tainted 5.8.0-next-20200812-syzkaller #0 [ 55.968744][ T7073] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.978777][ T7073] RIP: 0010:0x0 [ 55.982213][ T7073] Code: Bad RIP value. [ 55.986253][ T7073] RSP: 0018:ffffc90005887910 EFLAGS: 00010246 [ 55.992309][ T7073] RAX: 1ffffffff10b0e8b RBX: dffffc0000000000 RCX: ffff8880a80b1e48 [ 56.000309][ T7073] RDX: 00000000000000a3 RSI: 0000000020000240 RDI: ffff8880a1f50a80 [ 56.008255][ T7073] RBP: 0000000020000240 R08: 0000000000000001 R09: ffff88809f538c68 [ 56.016213][ T7073] R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90005887a28 [ 56.024167][ T7073] R13: ffffffff88587440 R14: 00000000000000a3 R15: 0000000000000001 [ 56.032112][ T7073] FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 56.041048][ T7073] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 56.047610][ T7073] CR2: ffffffffffffffd6 CR3: 00000000a471c000 CR4: 00000000001506f0 [ 56.055557][ T7073] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 56.063501][ T7073] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 56.071442][ T7073] Call Trace: [ 56.074706][ T7073] loop_rw_iter.part.0+0x26e/0x450 [ 56.079796][ T7073] ? rw_verify_area+0x11d/0x360 [ 56.084616][ T7073] io_write+0x6a2/0x7a0 [ 56.088744][ T7073] ? io_read+0xb60/0xb60 [ 56.092975][ T7073] ? mark_lock+0xbc/0x1710 [ 56.097369][ T7073] ? lock_repin_lock+0x460/0x460 [ 56.102280][ T7073] ? __lock_acquire+0x16cb/0x5640 [ 56.107280][ T7073] io_issue_sqe+0x1b0/0x6130 [ 56.111842][ T7073] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 56.117792][ T7073] ? lockdep_hardirqs_on+0x76/0xf0 [ 56.122899][ T7073] ? kthread_use_mm+0x1dc/0x430 [ 56.127726][ T7073] ? io_uring_setup+0x28c0/0x28c0 [ 56.132724][ T7073] ? lock_downgrade+0x830/0x830 [ 56.137548][ T7073] ? kthread_use_mm+0x19b/0x430 [ 56.142368][ T7073] ? io_wq_submit_work+0x183/0x3d0 [ 56.147452][ T7073] io_wq_submit_work+0x183/0x3d0 [ 56.152361][ T7073] io_worker_handle_work+0xa45/0x13f0 [ 56.157708][ T7073] io_wqe_worker+0xbf0/0x10e0 [ 56.162359][ T7073] ? io_worker_handle_work+0x13f0/0x13f0 [ 56.167963][ T7073] ? lockdep_hardirqs_on+0x76/0xf0 [ 56.173045][ T7073] ? __kthread_parkme+0x13f/0x1e0 [ 56.1