[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 92.657799][ T27] kauditd_printk_skb: 4 callbacks suppressed [ 92.657811][ T27] audit: type=1800 audit(1582947887.463:29): pid=9672 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 92.684464][ T27] audit: type=1800 audit(1582947887.473:30): pid=9672 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.24' (ECDSA) to the list of known hosts. 2020/02/29 03:45:48 parsed 1 programs 2020/02/29 03:45:50 executed programs: 0 syzkaller login: [ 155.641806][ T9839] IPVS: ftp: loaded support on port[0] = 21 [ 155.695343][ T9839] chnl_net:caif_netlink_parms(): no params data found [ 155.741986][ T9839] bridge0: port 1(bridge_slave_0) entered blocking state [ 155.749389][ T9839] bridge0: port 1(bridge_slave_0) entered disabled state [ 155.757057][ T9839] device bridge_slave_0 entered promiscuous mode [ 155.765354][ T9839] bridge0: port 2(bridge_slave_1) entered blocking state [ 155.772521][ T9839] bridge0: port 2(bridge_slave_1) entered disabled state [ 155.780306][ T9839] device bridge_slave_1 entered promiscuous mode [ 155.796821][ T9839] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 155.808114][ T9839] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 155.827416][ T9839] team0: Port device team_slave_0 added [ 155.834665][ T9839] team0: Port device team_slave_1 added [ 155.848247][ T9839] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 155.855873][ T9839] 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. [ 155.881824][ T9839] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 155.894235][ T9839] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 155.901209][ T9839] 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. [ 155.927130][ T9839] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 156.001366][ T9839] device hsr_slave_0 entered promiscuous mode [ 156.039157][ T9839] device hsr_slave_1 entered promiscuous mode [ 156.137616][ T9839] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 156.182045][ T9839] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 156.251766][ T9839] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 156.290750][ T9839] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 156.353530][ T9839] bridge0: port 2(bridge_slave_1) entered blocking state [ 156.360753][ T9839] bridge0: port 2(bridge_slave_1) entered forwarding state [ 156.368322][ T9839] bridge0: port 1(bridge_slave_0) entered blocking state [ 156.375487][ T9839] bridge0: port 1(bridge_slave_0) entered forwarding state [ 156.418087][ T9839] 8021q: adding VLAN 0 to HW filter on device bond0 [ 156.431776][ T2808] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 156.442490][ T2808] bridge0: port 1(bridge_slave_0) entered disabled state [ 156.450759][ T2808] bridge0: port 2(bridge_slave_1) entered disabled state [ 156.458589][ T2808] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 156.471639][ T9839] 8021q: adding VLAN 0 to HW filter on device team0 [ 156.482662][ T3026] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 156.491328][ T3026] bridge0: port 1(bridge_slave_0) entered blocking state [ 156.498410][ T3026] bridge0: port 1(bridge_slave_0) entered forwarding state [ 156.510010][ T2808] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 156.518428][ T2808] bridge0: port 2(bridge_slave_1) entered blocking state [ 156.525643][ T2808] bridge0: port 2(bridge_slave_1) entered forwarding state [ 156.551252][ T3026] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 156.561392][ T3026] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 156.570013][ T3026] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 156.578174][ T3026] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 156.592215][ T9839] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 156.603417][ T9839] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 156.612896][ T3024] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 156.630359][ T2808] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 156.637707][ T2808] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 156.651556][ T9839] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 156.669471][ T3024] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 156.688218][ T2808] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 156.698238][ T2808] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 156.706355][ T2808] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 156.717747][ T9839] device veth0_vlan entered promiscuous mode [ 156.730156][ T9839] device veth1_vlan entered promiscuous mode [ 156.750930][ T3024] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 156.760670][ T3024] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 156.773587][ T9839] device veth0_macvtap entered promiscuous mode [ 156.784025][ T9839] device veth1_macvtap entered promiscuous mode [ 156.799674][ T9839] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 156.807017][ T3024] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 156.816282][ T3024] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 156.824260][ T3024] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 156.833330][ T3024] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 156.844851][ T9839] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 156.852476][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 156.862084][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready 2020/02/29 03:45:55 executed programs: 62 [ 165.339992][T11452] [ 165.342390][T11452] ===================================== [ 165.347909][T11452] WARNING: bad unlock balance detected! [ 165.353431][T11452] 5.6.0-rc3-syzkaller #0 Not tainted [ 165.358686][T11452] ------------------------------------- [ 165.364205][T11452] syz-executor.0/11452 is trying to release lock ( [ 165.364208][T11452] ================================================================== [ 165.378730][T11452] BUG: KASAN: use-after-free in print_unlock_imbalance_bug.cold+0x97/0x123 [ 165.387335][T11452] Read of size 8 at addr ffff88809d32ca60 by task syz-executor.0/11452 [ 165.395540][T11452] [ 165.397849][T11452] CPU: 0 PID: 11452 Comm: syz-executor.0 Not tainted 5.6.0-rc3-syzkaller #0 [ 165.406509][T11452] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 165.416543][T11452] Call Trace: [ 165.419818][T11452] dump_stack+0x197/0x210 [ 165.424128][T11452] ? print_unlock_imbalance_bug.cold+0x97/0x123 [ 165.430351][T11452] print_address_description.constprop.0.cold+0xd4/0x30b [ 165.437349][T11452] ? print_unlock_imbalance_bug.cold+0x97/0x123 [ 165.443581][T11452] ? print_unlock_imbalance_bug.cold+0x97/0x123 [ 165.449800][T11452] __kasan_report.cold+0x1b/0x32 [ 165.454715][T11452] ? print_unlock_imbalance_bug.cold+0x97/0x123 [ 165.460941][T11452] ? ucma_destroy_id+0x24a/0x490 [ 165.465881][T11452] kasan_report+0x12/0x20 [ 165.470228][T11452] __asan_report_load8_noabort+0x14/0x20 [ 165.475860][T11452] print_unlock_imbalance_bug.cold+0x97/0x123 [ 165.481932][T11452] ? ucma_destroy_id+0x24a/0x490 [ 165.486879][T11452] lock_release+0x5f2/0x960 [ 165.491364][T11452] ? lock_downgrade+0x920/0x920 [ 165.496201][T11452] ? ucma_destroy_id+0x1e7/0x490 [ 165.501124][T11452] ? ucma_destroy_id+0x1c0/0x490 [ 165.506084][T11452] ? mutex_trylock+0x2d0/0x2d0 [ 165.510872][T11452] ? ucma_destroy_id+0x1c0/0x490 [ 165.515801][T11452] __mutex_unlock_slowpath+0x86/0x6a0 [ 165.521155][T11452] ? lock_downgrade+0x920/0x920 [ 165.526001][T11452] ? wait_for_completion+0x440/0x440 [ 165.531281][T11452] mutex_unlock+0xd/0x10 [ 165.535509][T11452] ucma_destroy_id+0x24a/0x490 [ 165.540271][T11452] ? ucma_close+0x310/0x310 [ 165.544754][T11452] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 165.550985][T11452] ? _copy_from_user+0x12c/0x1a0 [ 165.555901][T11452] ucma_write+0x2d7/0x3c0 [ 165.560208][T11452] ? ucma_close+0x310/0x310 [ 165.564712][T11452] ? ucma_open+0x290/0x290 [ 165.569108][T11452] ? apparmor_file_permission+0x27/0x30 [ 165.574631][T11452] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 165.580849][T11452] ? security_file_permission+0x8f/0x380 [ 165.586464][T11452] __vfs_write+0x8a/0x110 [ 165.590772][T11452] ? ucma_open+0x290/0x290 [ 165.595167][T11452] vfs_write+0x268/0x5d0 [ 165.599390][T11452] ksys_write+0x220/0x290 [ 165.603698][T11452] ? __ia32_sys_read+0xb0/0xb0 [ 165.608454][T11452] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 165.613888][T11452] ? do_syscall_64+0x26/0x790 [ 165.618543][T11452] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 165.624583][T11452] ? do_syscall_64+0x26/0x790 [ 165.629242][T11452] __x64_sys_write+0x73/0xb0 [ 165.633821][T11452] do_syscall_64+0xfa/0x790 [ 165.638307][T11452] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 165.644178][T11452] RIP: 0033:0x45c449 [ 165.648052][T11452] Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 165.667639][T11452] RSP: 002b:00007f36a9ea4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 165.676045][T11452] RAX: ffffffffffffffda RBX: 00007f36a9ea56d4 RCX: 000000000045c449 [ 165.683996][T11452] RDX: 0000000000000018 RSI: 0000000020000200 RDI: 0000000000000006 [ 165.691951][T11452] RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 [ 165.699908][T11452] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 165.707907][T11452] R13: 0000000000000cb7 R14: 00000000004d7b10 R15: 000000000076bf2c [ 165.715903][T11452] [ 165.718219][T11452] Allocated by task 11457: [ 165.722674][T11452] save_stack+0x23/0x90 [ 165.726810][T11452] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 165.732421][T11452] kasan_kmalloc+0x9/0x10 [ 165.736731][T11452] kmem_cache_alloc_trace+0x158/0x790 [ 165.742084][T11452] ucma_open+0x4f/0x290 [ 165.746230][T11452] misc_open+0x395/0x4c0 [ 165.750506][T11452] chrdev_open+0x245/0x6b0 [ 165.754902][T11452] do_dentry_open+0x4e6/0x1380 [ 165.759645][T11452] vfs_open+0xa0/0xd0 [ 165.763609][T11452] path_openat+0x12ee/0x3490 [ 165.768177][T11452] do_filp_open+0x192/0x260 [ 165.772677][T11452] do_sys_openat2+0x5eb/0x7e0 [ 165.777346][T11452] do_sys_open+0xf2/0x180 [ 165.781653][T11452] __x64_sys_openat+0x9d/0x100 [ 165.786420][T11452] do_syscall_64+0xfa/0x790 [ 165.790908][T11452] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 165.796809][T11452] [ 165.799119][T11452] Freed by task 11451: [ 165.803176][T11452] save_stack+0x23/0x90 [ 165.807314][T11452] __kasan_slab_free+0x102/0x150 [ 165.812236][T11452] kasan_slab_free+0xe/0x10 [ 165.816764][T11452] kfree+0x10a/0x2c0 [ 165.820647][T11452] ucma_close+0x275/0x310 [ 165.824960][T11452] __fput+0x2ff/0x890 [ 165.828921][T11452] ____fput+0x16/0x20 [ 165.832925][T11452] task_work_run+0x145/0x1c0 [ 165.837541][T11452] exit_to_usermode_loop+0x316/0x380 [ 165.842809][T11452] do_syscall_64+0x676/0x790 [ 165.847390][T11452] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 165.853385][T11452] [ 165.855705][T11452] The buggy address belongs to the object at ffff88809d32ca00 [ 165.855705][T11452] which belongs to the cache kmalloc-256 of size 256 [ 165.869766][T11452] The buggy address is located 96 bytes inside of [ 165.869766][T11452] 256-byte region [ffff88809d32ca00, ffff88809d32cb00) [ 165.882921][T11452] The buggy address belongs to the page: [ 165.888542][T11452] page:ffffea000274cb00 refcount:1 mapcount:0 mapping:ffff8880aa4008c0 index:0x0 [ 165.897628][T11452] flags: 0xfffe0000000200(slab) [ 165.902479][T11452] raw: 00fffe0000000200 ffffea00025e7e88 ffffea0002671d88 ffff8880aa4008c0 [ 165.911041][T11452] raw: 0000000000000000 ffff88809d32c000 0000000100000008 0000000000000000 [ 165.919646][T11452] page dumped because: kasan: bad access detected [ 165.926076][T11452] [ 165.928380][T11452] Memory state around the buggy address: [ 165.933997][T11452] ffff88809d32c900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 165.942044][T11452] ffff88809d32c980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 165.950084][T11452] >ffff88809d32ca00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 165.958119][T11452] ^ [ 165.965289][T11452] ffff88809d32ca80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 165.973327][T11452] ffff88809d32cb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 165.981359][T11452] ================================================================== [ 165.989397][T11452] Kernel panic - not syncing: panic_on_warn set ... [ 165.995997][T11452] CPU: 0 PID: 11452 Comm: syz-executor.0 Tainted: G B 5.6.0-rc3-syzkaller #0 [ 166.006079][T11452] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 166.016108][T11452] Call Trace: [ 166.019382][T11452] dump_stack+0x197/0x210 [ 166.023731][T11452] panic+0x2e3/0x75c [ 166.027608][T11452] ? add_taint.cold+0x16/0x16 [ 166.032271][T11452] ? print_unlock_imbalance_bug.cold+0x97/0x123 [ 166.038491][T11452] ? trace_hardirqs_off+0x62/0x240 [ 166.043578][T11452] ? trace_hardirqs_off+0x59/0x240 [ 166.048676][T11452] ? print_unlock_imbalance_bug.cold+0x97/0x123 [ 166.054905][T11452] end_report+0x47/0x4f [ 166.059036][T11452] ? print_unlock_imbalance_bug.cold+0x97/0x123 [ 166.065251][T11452] __kasan_report.cold+0xe/0x32 [ 166.070085][T11452] ? print_unlock_imbalance_bug.cold+0x97/0x123 [ 166.076305][T11452] ? ucma_destroy_id+0x24a/0x490 [ 166.081219][T11452] kasan_report+0x12/0x20 [ 166.085534][T11452] __asan_report_load8_noabort+0x14/0x20 [ 166.091151][T11452] print_unlock_imbalance_bug.cold+0x97/0x123 [ 166.097196][T11452] ? ucma_destroy_id+0x24a/0x490 [ 166.102111][T11452] lock_release+0x5f2/0x960 [ 166.107474][T11452] ? lock_downgrade+0x920/0x920 [ 166.112301][T11452] ? ucma_destroy_id+0x1e7/0x490 [ 166.117216][T11452] ? ucma_destroy_id+0x1c0/0x490 [ 166.122132][T11452] ? mutex_trylock+0x2d0/0x2d0 [ 166.126874][T11452] ? ucma_destroy_id+0x1c0/0x490 [ 166.131787][T11452] __mutex_unlock_slowpath+0x86/0x6a0 [ 166.137136][T11452] ? lock_downgrade+0x920/0x920 [ 166.141963][T11452] ? wait_for_completion+0x440/0x440 [ 166.147225][T11452] mutex_unlock+0xd/0x10 [ 166.151462][T11452] ucma_destroy_id+0x24a/0x490 [ 166.156223][T11452] ? ucma_close+0x310/0x310 [ 166.160707][T11452] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 166.166924][T11452] ? _copy_from_user+0x12c/0x1a0 [ 166.171847][T11452] ucma_write+0x2d7/0x3c0 [ 166.176164][T11452] ? ucma_close+0x310/0x310 [ 166.180654][T11452] ? ucma_open+0x290/0x290 [ 166.185071][T11452] ? apparmor_file_permission+0x27/0x30 [ 166.190611][T11452] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 166.196832][T11452] ? security_file_permission+0x8f/0x380 [ 166.202443][T11452] __vfs_write+0x8a/0x110 [ 166.206755][T11452] ? ucma_open+0x290/0x290 [ 166.211147][T11452] vfs_write+0x268/0x5d0 [ 166.215368][T11452] ksys_write+0x220/0x290 [ 166.219674][T11452] ? __ia32_sys_read+0xb0/0xb0 [ 166.224415][T11452] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 166.229852][T11452] ? do_syscall_64+0x26/0x790 [ 166.234517][T11452] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 166.240680][T11452] ? do_syscall_64+0x26/0x790 [ 166.245345][T11452] __x64_sys_write+0x73/0xb0 [ 166.249924][T11452] do_syscall_64+0xfa/0x790 [ 166.254452][T11452] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 166.260337][T11452] RIP: 0033:0x45c449 [ 166.264212][T11452] Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 166.283795][T11452] RSP: 002b:00007f36a9ea4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 166.292185][T11452] RAX: ffffffffffffffda RBX: 00007f36a9ea56d4 RCX: 000000000045c449 [ 166.300138][T11452] RDX: 0000000000000018 RSI: 0000000020000200 RDI: 0000000000000006 [ 166.308126][T11452] RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 [ 166.316076][T11452] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 166.324030][T11452] R13: 0000000000000cb7 R14: 00000000004d7b10 R15: 000000000076bf2c [ 166.333174][T11452] Kernel Offset: disabled [ 166.337500][T11452] Rebooting in 86400 seconds..