[ OK ] Started Regular background program processing daemon. Starting getty on tty2-tty6 if dbus and logind are not available... Starting System Logging Service... [ OK ] Started Daily Cleanup of Temporary Directories. [ OK ] Reached target Timers. [ OK ] Started Permit User Sessions. [ OK ] Started System Logging Service. [ OK ] Found device /dev/ttyS0. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ 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 '10.128.15.200' (ECDSA) to the list of known hosts. 2020/12/02 20:23:25 parsed 1 programs 2020/12/02 20:23:25 executed programs: 0 syzkaller login: [ 77.460120][ T34] audit: type=1400 audit(1606940605.578:8): avc: denied { execmem } for pid=8494 comm="syz-executor.0" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 78.597874][ T8495] IPVS: ftp: loaded support on port[0] = 21 [ 78.755471][ T8495] chnl_net:caif_netlink_parms(): no params data found [ 78.815282][ T8495] bridge0: port 1(bridge_slave_0) entered blocking state [ 78.823379][ T8495] bridge0: port 1(bridge_slave_0) entered disabled state [ 78.833373][ T8495] device bridge_slave_0 entered promiscuous mode [ 78.843142][ T8495] bridge0: port 2(bridge_slave_1) entered blocking state [ 78.851300][ T8495] bridge0: port 2(bridge_slave_1) entered disabled state [ 78.860271][ T8495] device bridge_slave_1 entered promiscuous mode [ 78.883187][ T8495] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 78.895308][ T8495] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 78.920360][ T8495] team0: Port device team_slave_0 added [ 78.927830][ T8495] team0: Port device team_slave_1 added [ 78.946970][ T8495] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 78.954177][ T8495] 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. [ 78.980281][ T8495] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 78.993257][ T8495] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 79.000372][ T8495] 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. [ 79.026387][ T8495] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 79.055414][ T8495] device hsr_slave_0 entered promiscuous mode [ 79.062304][ T8495] device hsr_slave_1 entered promiscuous mode [ 79.179857][ T8495] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 79.193331][ T8495] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 79.204126][ T8495] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 79.214828][ T8495] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 79.244895][ T8495] bridge0: port 2(bridge_slave_1) entered blocking state [ 79.252105][ T8495] bridge0: port 2(bridge_slave_1) entered forwarding state [ 79.260105][ T8495] bridge0: port 1(bridge_slave_0) entered blocking state [ 79.267207][ T8495] bridge0: port 1(bridge_slave_0) entered forwarding state [ 79.318450][ T8495] 8021q: adding VLAN 0 to HW filter on device bond0 [ 79.333499][ T3201] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 79.344786][ T3201] bridge0: port 1(bridge_slave_0) entered disabled state [ 79.354611][ T3201] bridge0: port 2(bridge_slave_1) entered disabled state [ 79.363059][ T3201] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 79.377386][ T8495] 8021q: adding VLAN 0 to HW filter on device team0 [ 79.391377][ T3201] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 79.401449][ T3201] bridge0: port 1(bridge_slave_0) entered blocking state [ 79.408598][ T3201] bridge0: port 1(bridge_slave_0) entered forwarding state [ 79.428571][ T2988] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 79.437557][ T2988] bridge0: port 2(bridge_slave_1) entered blocking state [ 79.444725][ T2988] bridge0: port 2(bridge_slave_1) entered forwarding state [ 79.457417][ T3178] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 79.467339][ T3178] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 79.488955][ T3178] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 79.497876][ T3178] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 79.506825][ T3178] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 79.519554][ T8495] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 79.539373][ T56] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 79.546901][ T56] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 79.563459][ T8495] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 79.584225][ T3178] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 79.606576][ T56] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 79.615092][ T56] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 79.624033][ T56] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 79.635277][ T8495] device veth0_vlan entered promiscuous mode [ 79.647760][ T8495] device veth1_vlan entered promiscuous mode [ 79.672233][ T3178] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 79.681157][ T3178] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 79.690425][ T3178] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 79.702527][ T8495] device veth0_macvtap entered promiscuous mode [ 79.713866][ T8495] device veth1_macvtap entered promiscuous mode [ 79.730220][ T3178] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 79.744740][ T8495] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 79.753554][ T3178] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 79.763505][ T3178] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 79.776961][ T8495] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 79.784961][ T3178] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 79.794344][ T3178] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 79.807190][ T8495] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 79.820262][ T8495] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 79.830100][ T8495] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 79.840883][ T8495] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 79.927255][ T226] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 79.944977][ T226] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 79.955709][ T3178] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 79.995060][ T133] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 80.003215][ T133] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 80.012410][ T3178] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready [ 80.121806][ T8737] [ 80.124172][ T8737] ============================================ [ 80.130313][ T8737] WARNING: possible recursive locking detected [ 80.136457][ T8737] 5.10.0-rc6-syzkaller #0 Not tainted [ 80.141820][ T8737] -------------------------------------------- [ 80.147971][ T8737] syz-executor.0/8737 is trying to acquire lock: [ 80.154289][ T8737] ffff8880122bd8a8 (&hugetlbfs_i_mmap_rwsem_key){++++}-{3:3}, at: hugetlb_cow+0xedf/0x15f0 [ 80.164298][ T8737] [ 80.164298][ T8737] but task is already holding lock: [ 80.171656][ T8737] ffff8880122bd8a8 (&hugetlbfs_i_mmap_rwsem_key){++++}-{3:3}, at: hugetlb_fault+0x26c/0x2330 [ 80.181833][ T8737] [ 80.181833][ T8737] other info that might help us debug this: [ 80.189889][ T8737] Possible unsafe locking scenario: [ 80.189889][ T8737] [ 80.197334][ T8737] CPU0 [ 80.200711][ T8737] ---- [ 80.203982][ T8737] lock(&hugetlbfs_i_mmap_rwsem_key); [ 80.209422][ T8737] lock(&hugetlbfs_i_mmap_rwsem_key); [ 80.214859][ T8737] [ 80.214859][ T8737] *** DEADLOCK *** [ 80.214859][ T8737] [ 80.222982][ T8737] May be due to missing lock nesting notation [ 80.222982][ T8737] [ 80.231563][ T8737] 3 locks held by syz-executor.0/8737: [ 80.236994][ T8737] #0: ffff88802ed06468 (&mm->mmap_lock#2){++++}-{3:3}, at: do_user_addr_fault+0x25c/0xb40 [ 80.246974][ T8737] #1: ffff8880122bd8a8 (&hugetlbfs_i_mmap_rwsem_key){++++}-{3:3}, at: hugetlb_fault+0x26c/0x2330 [ 80.257703][ T8737] #2: ffff8881414d8848 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_fault+0x368/0x2330 [ 80.268463][ T8737] [ 80.268463][ T8737] stack backtrace: [ 80.274443][ T8737] CPU: 0 PID: 8737 Comm: syz-executor.0 Not tainted 5.10.0-rc6-syzkaller #0 [ 80.283138][ T8737] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 80.293173][ T8737] Call Trace: [ 80.296515][ T8737] dump_stack+0x107/0x163 [ 80.300835][ T8737] __lock_acquire.cold+0x15e/0x3b0 [ 80.305945][ T8737] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 80.311912][ T8737] lock_acquire+0x29d/0x740 [ 80.316398][ T8737] ? hugetlb_cow+0xedf/0x15f0 [ 80.321068][ T8737] ? lock_release+0x710/0x710 [ 80.325861][ T8737] down_write+0x8d/0x150 [ 80.330076][ T8737] ? hugetlb_cow+0xedf/0x15f0 [ 80.334724][ T8737] ? down_write_killable+0x170/0x170 [ 80.340007][ T8737] ? xas_start+0x152/0x6c0 [ 80.344402][ T8737] hugetlb_cow+0xedf/0x15f0 [ 80.348904][ T8737] ? lock_release+0x710/0x710 [ 80.353565][ T8737] ? unmap_hugepage_range+0x1f0/0x1f0 [ 80.358922][ T8737] ? do_raw_spin_lock+0x120/0x2b0 [ 80.364038][ T8737] ? rwlock_bug.part.0+0x90/0x90 [ 80.368951][ T8737] ? pagecache_get_page+0x23c/0x1460 [ 80.374219][ T8737] hugetlb_fault+0x155c/0x2330 [ 80.378979][ T8737] ? copy_hugetlb_page_range+0xde0/0xde0 [ 80.384599][ T8737] ? count_memcg_event_mm.part.0+0x151/0x280 [ 80.390566][ T8737] ? lock_downgrade+0x6d0/0x6d0 [ 80.395410][ T8737] ? mark_held_locks+0x9f/0xe0 [ 80.400263][ T8737] handle_mm_fault+0x11c3/0x55d0 [ 80.405192][ T8737] ? vm_iomap_memory+0x190/0x190 [ 80.410104][ T8737] ? vmacache_find+0x62/0x330 [ 80.414766][ T8737] do_user_addr_fault+0x55b/0xb40 [ 80.419765][ T8737] exc_page_fault+0x9e/0x180 [ 80.424329][ T8737] ? asm_exc_page_fault+0x8/0x30 [ 80.429239][ T8737] asm_exc_page_fault+0x1e/0x30 [ 80.434077][ T8737] RIP: 0033:0x4451d1 [ 80.437950][ T8737] 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 [ 80.457712][ T8737] RSP: 002b:00007fff9ac66f48 EFLAGS: 00010203 [ 80.463751][ T8737] RAX: 87d8195ce8261103 RBX: 00000000011a0000 RCX: 000000000000001a [ 80.471697][ T8737] RDX: 0000000000000372 RSI: 00000000011a0020 RDI: 0000000020000f00 [ 80.479658][ T8737] RBP: 00000000011a0008 R08: 055ee48822f48f6f R09: bf2d7b319aa8d7d2 [ 80.487715][ T8737] R10: 599cd685cefed921 R11: 0000000000000000 R12: fffffffffffffffe [ 80.495674][ T8737] R13: 00000000000138fe R14: 00000000000003e8 R15: 000000000119bf2c [ 80.607847][ T56] Bluetooth: hci0: command 0x0409 tx timeout [ 82.687638][ T3178] Bluetooth: hci0: command 0x041b tx timeout [ 84.767969][ T3178] Bluetooth: hci0: command 0x040f tx timeout [ 86.847249][ T7] Bluetooth: hci0: command 0x0419 tx timeout