[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.15.207' (ECDSA) to the list of known hosts. 2020/12/02 18:28:33 parsed 1 programs 2020/12/02 18:28:34 executed programs: 0 syzkaller login: [ 64.291595][ T8481] IPVS: ftp: loaded support on port[0] = 21 [ 64.450320][ T8481] chnl_net:caif_netlink_parms(): no params data found [ 64.530652][ T8481] bridge0: port 1(bridge_slave_0) entered blocking state [ 64.538443][ T8481] bridge0: port 1(bridge_slave_0) entered disabled state [ 64.548254][ T8481] device bridge_slave_0 entered promiscuous mode [ 64.557381][ T8481] bridge0: port 2(bridge_slave_1) entered blocking state [ 64.564479][ T8481] bridge0: port 2(bridge_slave_1) entered disabled state [ 64.572498][ T8481] device bridge_slave_1 entered promiscuous mode [ 64.591993][ T8481] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 64.602641][ T8481] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 64.625103][ T8481] team0: Port device team_slave_0 added [ 64.632475][ T8481] team0: Port device team_slave_1 added [ 64.649964][ T8481] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 64.656971][ T8481] 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. [ 64.683134][ T8481] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 64.696064][ T8481] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 64.703094][ T8481] 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. [ 64.729037][ T8481] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 64.755598][ T8481] device hsr_slave_0 entered promiscuous mode [ 64.762289][ T8481] device hsr_slave_1 entered promiscuous mode [ 64.856013][ T8481] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 64.865450][ T8481] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 64.875321][ T8481] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 64.885307][ T8481] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 64.909753][ T8481] bridge0: port 2(bridge_slave_1) entered blocking state [ 64.916898][ T8481] bridge0: port 2(bridge_slave_1) entered forwarding state [ 64.924403][ T8481] bridge0: port 1(bridge_slave_0) entered blocking state [ 64.931620][ T8481] bridge0: port 1(bridge_slave_0) entered forwarding state [ 64.974222][ T8481] 8021q: adding VLAN 0 to HW filter on device bond0 [ 64.990433][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 65.002309][ T5] bridge0: port 1(bridge_slave_0) entered disabled state [ 65.012170][ T5] bridge0: port 2(bridge_slave_1) entered disabled state [ 65.020407][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 65.033103][ T8481] 8021q: adding VLAN 0 to HW filter on device team0 [ 65.044605][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 65.053359][ T17] bridge0: port 1(bridge_slave_0) entered blocking state [ 65.060458][ T17] bridge0: port 1(bridge_slave_0) entered forwarding state [ 65.072289][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 65.081901][ T5] bridge0: port 2(bridge_slave_1) entered blocking state [ 65.089026][ T5] bridge0: port 2(bridge_slave_1) entered forwarding state [ 65.108520][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 65.117576][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 65.136636][ T8700] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 65.144876][ T8700] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 65.155124][ T8700] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 65.164806][ T8481] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 65.183726][ T8700] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 65.191636][ T8700] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 65.205411][ T8481] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 65.224176][ T8700] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 65.244137][ T8481] device veth0_vlan entered promiscuous mode [ 65.251871][ T3001] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 65.261079][ T3001] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 65.269602][ T3001] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 65.282778][ T8481] device veth1_vlan entered promiscuous mode [ 65.303282][ T8700] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 65.312213][ T8700] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 65.321031][ T8700] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 65.331258][ T8481] device veth0_macvtap entered promiscuous mode [ 65.342821][ T8481] device veth1_macvtap entered promiscuous mode [ 65.359970][ T8481] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 65.369009][ T8700] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 65.379031][ T8700] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 65.390681][ T8481] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 65.398719][ T3001] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 65.410647][ T8481] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 65.419839][ T8481] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 65.428658][ T8481] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 65.437901][ T8481] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 65.524826][ T44] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 65.556818][ T44] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 65.569363][ T21] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 65.577922][ T3001] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 65.578544][ T21] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 65.598904][ T8700] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready [ 65.692683][ T8725] [ 65.695032][ T8725] ============================================ [ 65.701175][ T8725] WARNING: possible recursive locking detected [ 65.707318][ T8725] 5.10.0-rc6-syzkaller #0 Not tainted [ 65.712676][ T8725] -------------------------------------------- [ 65.718817][ T8725] syz-executor.0/8725 is trying to acquire lock: [ 65.725129][ T8725] ffff88801ab48358 (&hugetlbfs_i_mmap_rwsem_key){++++}-{3:3}, at: hugetlb_cow+0xedf/0x15f0 [ 65.735136][ T8725] [ 65.735136][ T8725] but task is already holding lock: [ 65.742491][ T8725] ffff88801ab48358 (&hugetlbfs_i_mmap_rwsem_key){++++}-{3:3}, at: hugetlb_fault+0x26c/0x2330 [ 65.752657][ T8725] [ 65.752657][ T8725] other info that might help us debug this: [ 65.760704][ T8725] Possible unsafe locking scenario: [ 65.760704][ T8725] [ 65.768145][ T8725] CPU0 [ 65.771413][ T8725] ---- [ 65.774667][ T8725] lock(&hugetlbfs_i_mmap_rwsem_key); [ 65.780098][ T8725] lock(&hugetlbfs_i_mmap_rwsem_key); [ 65.785530][ T8725] [ 65.785530][ T8725] *** DEADLOCK *** [ 65.785530][ T8725] [ 65.793652][ T8725] May be due to missing lock nesting notation [ 65.793652][ T8725] [ 65.801947][ T8725] 3 locks held by syz-executor.0/8725: [ 65.807372][ T8725] #0: ffff8880299d4b68 (&mm->mmap_lock#2){++++}-{3:3}, at: do_user_addr_fault+0x25c/0xb40 [ 65.817381][ T8725] #1: ffff88801ab48358 (&hugetlbfs_i_mmap_rwsem_key){++++}-{3:3}, at: hugetlb_fault+0x26c/0x2330 [ 65.827952][ T8725] #2: ffff8880146f8458 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_fault+0x368/0x2330 [ 65.838694][ T8725] [ 65.838694][ T8725] stack backtrace: [ 65.844605][ T8725] CPU: 1 PID: 8725 Comm: syz-executor.0 Not tainted 5.10.0-rc6-syzkaller #0 [ 65.853260][ T8725] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.863285][ T8725] Call Trace: [ 65.866553][ T8725] dump_stack+0x107/0x163 [ 65.870856][ T8725] __lock_acquire.cold+0x15e/0x3b0 [ 65.875946][ T8725] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 65.881918][ T8725] lock_acquire+0x29d/0x740 [ 65.886396][ T8725] ? hugetlb_cow+0xedf/0x15f0 [ 65.891042][ T8725] ? lock_release+0x710/0x710 [ 65.895743][ T8725] down_write+0x8d/0x150 [ 65.899992][ T8725] ? hugetlb_cow+0xedf/0x15f0 [ 65.904638][ T8725] ? down_write_killable+0x170/0x170 [ 65.909898][ T8725] ? xas_start+0x152/0x6c0 [ 65.914284][ T8725] hugetlb_cow+0xedf/0x15f0 [ 65.918761][ T8725] ? lock_release+0x710/0x710 [ 65.923410][ T8725] ? unmap_hugepage_range+0x1f0/0x1f0 [ 65.928756][ T8725] ? do_raw_spin_lock+0x120/0x2b0 [ 65.933752][ T8725] ? rwlock_bug.part.0+0x90/0x90 [ 65.938661][ T8725] ? pagecache_get_page+0x23c/0x1460 [ 65.943921][ T8725] hugetlb_fault+0x155c/0x2330 [ 65.948662][ T8725] ? copy_hugetlb_page_range+0xde0/0xde0 [ 65.954286][ T8725] ? count_memcg_event_mm.part.0+0x151/0x280 [ 65.960242][ T8725] ? lock_downgrade+0x6d0/0x6d0 [ 65.965063][ T8725] ? mark_held_locks+0x9f/0xe0 [ 65.969810][ T8725] handle_mm_fault+0x11c3/0x55d0 [ 65.974721][ T8725] ? vm_iomap_memory+0x190/0x190 [ 65.979632][ T8725] ? vmacache_find+0x62/0x330 [ 65.984283][ T8725] do_user_addr_fault+0x55b/0xb40 [ 65.989283][ T8725] exc_page_fault+0x9e/0x180 [ 65.993845][ T8725] ? asm_exc_page_fault+0x8/0x30 [ 65.998756][ T8725] asm_exc_page_fault+0x1e/0x30 [ 66.003589][ T8725] RIP: 0033:0x4451d1 [ 66.007457][ T8725] Code: 2e 0f 1f 84 00 00 00 00 00 48 81 fa 00 04 00 00 77 77 89 d1 c1 e9 05 74 60 ff c9 48 8b 06 4c 8b 46 08 4c 8b 4e 10 4c 8b 56 18 <48> 89 07 4c 89 47 08 4c 89 4f 10 4c 89 57 18 48 8d 76 20 48 8d 7f [ 66.027047][ T8725] RSP: 002b:00007ffd28e931a8 EFLAGS: 00010203 [ 66.033098][ T8725] RAX: 87d8195ce8261103 RBX: 00000000011a0000 RCX: 000000000000001a [ 66.041042][ T8725] RDX: 0000000000000372 RSI: 00000000011a0020 RDI: 0000000020000f00 [ 66.048986][ T8725] RBP: 00000000011a0008 R08: 055ee48822f48f6f R09: bf2d7b319aa8d7d2 [ 66.056942][ T8725] R10: 599cd685cefed921 R11: 0000000000000000 R12: fffffffffffffffe [ 66.064886][ T8725] R13: 000000000001009d R14: 00000000000003e8 R15: 000000000119bf2c [ 66.325971][ T3001] Bluetooth: hci0: command 0x0409 tx timeout [ 68.405496][ T3001] Bluetooth: hci0: command 0x041b tx timeout [ 70.485418][ T3001] Bluetooth: hci0: command 0x040f tx timeout [ 72.565315][ T8702] Bluetooth: hci0: command 0x0419 tx timeout