[ 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 '10.128.1.59' (ECDSA) to the list of known hosts. 2020/12/02 22:37:52 parsed 1 programs 2020/12/02 22:37:53 executed programs: 0 syzkaller login: [ 72.403081][ T8519] IPVS: ftp: loaded support on port[0] = 21 [ 72.586835][ T8519] chnl_net:caif_netlink_parms(): no params data found [ 72.641455][ T8519] bridge0: port 1(bridge_slave_0) entered blocking state [ 72.649515][ T8519] bridge0: port 1(bridge_slave_0) entered disabled state [ 72.658602][ T8519] device bridge_slave_0 entered promiscuous mode [ 72.668440][ T8519] bridge0: port 2(bridge_slave_1) entered blocking state [ 72.675902][ T8519] bridge0: port 2(bridge_slave_1) entered disabled state [ 72.683871][ T8519] device bridge_slave_1 entered promiscuous mode [ 72.705162][ T8519] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 72.716789][ T8519] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 72.741327][ T8519] team0: Port device team_slave_0 added [ 72.749335][ T8519] team0: Port device team_slave_1 added [ 72.767387][ T8519] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 72.774676][ T8519] 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. [ 72.800707][ T8519] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 72.814193][ T8519] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 72.821833][ T8519] 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. [ 72.848492][ T8519] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 72.877370][ T8519] device hsr_slave_0 entered promiscuous mode [ 72.884376][ T8519] device hsr_slave_1 entered promiscuous mode [ 72.992204][ T8519] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 73.009058][ T8519] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 73.018368][ T8519] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 73.028900][ T8519] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 73.056919][ T8519] bridge0: port 2(bridge_slave_1) entered blocking state [ 73.064355][ T8519] bridge0: port 2(bridge_slave_1) entered forwarding state [ 73.072606][ T8519] bridge0: port 1(bridge_slave_0) entered blocking state [ 73.079723][ T8519] bridge0: port 1(bridge_slave_0) entered forwarding state [ 73.134928][ T8519] 8021q: adding VLAN 0 to HW filter on device bond0 [ 73.148397][ T4995] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 73.163206][ T4995] bridge0: port 1(bridge_slave_0) entered disabled state [ 73.172478][ T4995] bridge0: port 2(bridge_slave_1) entered disabled state [ 73.181406][ T4995] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 73.200092][ T8519] 8021q: adding VLAN 0 to HW filter on device team0 [ 73.212588][ T3220] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 73.221242][ T3220] bridge0: port 1(bridge_slave_0) entered blocking state [ 73.228423][ T3220] bridge0: port 1(bridge_slave_0) entered forwarding state [ 73.242923][ T4995] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 73.252295][ T4995] bridge0: port 2(bridge_slave_1) entered blocking state [ 73.259392][ T4995] bridge0: port 2(bridge_slave_1) entered forwarding state [ 73.281789][ T3220] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 73.291165][ T3220] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 73.311472][ T4995] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 73.321800][ T4995] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 73.330847][ T4995] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 73.342353][ T8519] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 73.368574][ T8519] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 73.377316][ T4995] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 73.387533][ T4995] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 73.415239][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 73.429813][ T3220] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 73.439382][ T3220] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 73.448137][ T3220] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 73.459086][ T8519] device veth0_vlan entered promiscuous mode [ 73.473540][ T8519] device veth1_vlan entered promiscuous mode [ 73.496940][ T8738] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 73.506136][ T8738] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 73.516876][ T8738] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 73.528778][ T8519] device veth0_macvtap entered promiscuous mode [ 73.539046][ T8519] device veth1_macvtap entered promiscuous mode [ 73.558114][ T8519] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 73.567563][ T8738] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 73.579067][ T8738] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 73.591865][ T8519] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 73.602175][ T8738] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 73.613190][ T8738] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 73.625403][ T8519] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 73.635049][ T8519] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 73.646713][ T8519] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 73.659283][ T8519] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 73.767267][ T8469] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 73.785384][ T8469] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 73.799417][ T18] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 73.821924][ T8469] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 73.830532][ T8469] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 73.839390][ T3220] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready [ 73.971974][ T8763] [ 73.974348][ T8763] ============================================ [ 73.980581][ T8763] WARNING: possible recursive locking detected [ 73.986735][ T8763] 5.10.0-rc6-next-20201201-syzkaller #0 Not tainted [ 73.993334][ T8763] -------------------------------------------- [ 73.999485][ T8763] syz-executor.0/8763 is trying to acquire lock: [ 74.005813][ T8763] ffff88801cfbccf8 (&hugetlbfs_i_mmap_rwsem_key){++++}-{3:3}, at: hugetlb_cow+0xedf/0x15f0 [ 74.015924][ T8763] [ 74.015924][ T8763] but task is already holding lock: [ 74.023297][ T8763] ffff88801cfbccf8 (&hugetlbfs_i_mmap_rwsem_key){++++}-{3:3}, at: hugetlb_fault+0x26c/0x2340 [ 74.033917][ T8763] [ 74.033917][ T8763] other info that might help us debug this: [ 74.041979][ T8763] Possible unsafe locking scenario: [ 74.041979][ T8763] [ 74.049546][ T8763] CPU0 [ 74.052813][ T8763] ---- [ 74.056088][ T8763] lock(&hugetlbfs_i_mmap_rwsem_key); [ 74.061572][ T8763] lock(&hugetlbfs_i_mmap_rwsem_key); [ 74.067015][ T8763] [ 74.067015][ T8763] *** DEADLOCK *** [ 74.067015][ T8763] [ 74.075161][ T8763] May be due to missing lock nesting notation [ 74.075161][ T8763] [ 74.083472][ T8763] 3 locks held by syz-executor.0/8763: [ 74.088908][ T8763] #0: ffff88801d7ba458 (&mm->mmap_lock#2){++++}-{3:3}, at: do_user_addr_fault+0x25f/0xc50 [ 74.098907][ T8763] #1: ffff88801cfbccf8 (&hugetlbfs_i_mmap_rwsem_key){++++}-{3:3}, at: hugetlb_fault+0x26c/0x2340 [ 74.109685][ T8763] #2: ffff88814141a218 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_fault+0x368/0x2340 [ 74.120549][ T8763] [ 74.120549][ T8763] stack backtrace: [ 74.126466][ T8763] CPU: 1 PID: 8763 Comm: syz-executor.0 Not tainted 5.10.0-rc6-next-20201201-syzkaller #0 [ 74.136357][ T8763] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.146600][ T8763] Call Trace: [ 74.149902][ T8763] dump_stack+0x107/0x163 [ 74.154220][ T8763] __lock_acquire.cold+0x15e/0x3b0 [ 74.159319][ T8763] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 74.165292][ T8763] lock_acquire+0x29d/0x740 [ 74.169780][ T8763] ? hugetlb_cow+0xedf/0x15f0 [ 74.174440][ T8763] ? lock_release+0x710/0x710 [ 74.179205][ T8763] down_write+0x8d/0x150 [ 74.183429][ T8763] ? hugetlb_cow+0xedf/0x15f0 [ 74.188095][ T8763] ? rwsem_down_read_slowpath+0xc90/0xc90 [ 74.193821][ T8763] ? lock_downgrade+0x6d0/0x6d0 [ 74.198659][ T8763] hugetlb_cow+0xedf/0x15f0 [ 74.203250][ T8763] ? lock_release+0x710/0x710 [ 74.207912][ T8763] ? unmap_hugepage_range+0x1f0/0x1f0 [ 74.213979][ T8763] ? do_raw_spin_lock+0x120/0x2b0 [ 74.219027][ T8763] ? rwlock_bug.part.0+0x90/0x90 [ 74.223962][ T8763] hugetlb_fault+0x1561/0x2340 [ 74.228752][ T8763] ? copy_hugetlb_page_range+0xde0/0xde0 [ 74.234385][ T8763] ? count_memcg_event_mm.part.0+0x151/0x280 [ 74.240375][ T8763] ? lock_downgrade+0x6d0/0x6d0 [ 74.245231][ T8763] ? mark_held_locks+0x9f/0xe0 [ 74.249994][ T8763] handle_mm_fault+0x11c3/0x55d0 [ 74.254950][ T8763] ? vm_iomap_memory+0x190/0x190 [ 74.259883][ T8763] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 74.265598][ T8763] ? vmacache_find+0x62/0x330 [ 74.270371][ T8763] do_user_addr_fault+0x570/0xc50 [ 74.275391][ T8763] exc_page_fault+0x9e/0x180 [ 74.279976][ T8763] ? asm_exc_page_fault+0x8/0x30 [ 74.284900][ T8763] asm_exc_page_fault+0x1e/0x30 [ 74.289755][ T8763] RIP: 0033:0x4451d1 [ 74.293663][ T8763] 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 [ 74.313341][ T8763] RSP: 002b:00007fff972a4c68 EFLAGS: 00010203 [ 74.319409][ T8763] RAX: 87d8195ce8261103 RBX: 00000000011a0000 RCX: 000000000000001a [ 74.327387][ T8763] RDX: 0000000000000372 RSI: 00000000011a0020 RDI: 0000000020000f00 [ 74.335344][ T8763] RBP: 00000000011a0008 R08: 055ee48822f48f6f R09: bf2d7b319aa8d7d2 [ 74.344271][ T8763] R10: 599cd685cefed921 R11: 0000000000000000 R12: fffffffffffffffe [ 74.352233][ T8763] R13: 0000000000012106 R14: 00000000000003e8 R15: 000000000119bf2c [ 74.411269][ T4995] Bluetooth: hci0: command 0x0409 tx timeout [ 76.489973][ T3220] Bluetooth: hci0: command 0x041b tx timeout [ 78.570165][ T4995] Bluetooth: hci0: command 0x040f tx timeout [ 80.649780][ T4995] Bluetooth: hci0: command 0x0419 tx timeout