[ 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 '10.128.1.19' (ECDSA) to the list of known hosts. 2020/05/23 13:51:00 parsed 1 programs 2020/05/23 13:51:00 executed programs: 0 syzkaller login: [ 62.231501][ T6833] IPVS: ftp: loaded support on port[0] = 21 [ 62.330646][ T6833] chnl_net:caif_netlink_parms(): no params data found [ 62.381502][ T6833] bridge0: port 1(bridge_slave_0) entered blocking state [ 62.389236][ T6833] bridge0: port 1(bridge_slave_0) entered disabled state [ 62.398020][ T6833] device bridge_slave_0 entered promiscuous mode [ 62.409379][ T6833] bridge0: port 2(bridge_slave_1) entered blocking state [ 62.416794][ T6833] bridge0: port 2(bridge_slave_1) entered disabled state [ 62.426848][ T6833] device bridge_slave_1 entered promiscuous mode [ 62.447983][ T6833] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 62.459881][ T6833] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 62.481973][ T6833] team0: Port device team_slave_0 added [ 62.489792][ T6833] team0: Port device team_slave_1 added [ 62.508258][ T6833] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 62.520060][ T6833] 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. [ 62.546398][ T6833] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 62.559853][ T6833] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 62.567829][ T6833] 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. [ 62.595952][ T6833] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 62.658899][ T6833] device hsr_slave_0 entered promiscuous mode [ 62.687311][ T6833] device hsr_slave_1 entered promiscuous mode [ 62.833082][ T6833] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 62.889113][ T6833] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 62.948813][ T6833] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 62.998851][ T6833] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 63.053241][ T6833] bridge0: port 2(bridge_slave_1) entered blocking state [ 63.061016][ T6833] bridge0: port 2(bridge_slave_1) entered forwarding state [ 63.068927][ T6833] bridge0: port 1(bridge_slave_0) entered blocking state [ 63.076268][ T6833] bridge0: port 1(bridge_slave_0) entered forwarding state [ 63.121465][ T6833] 8021q: adding VLAN 0 to HW filter on device bond0 [ 63.135017][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 63.145881][ T5] bridge0: port 1(bridge_slave_0) entered disabled state [ 63.154902][ T5] bridge0: port 2(bridge_slave_1) entered disabled state [ 63.163712][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 63.177469][ T6833] 8021q: adding VLAN 0 to HW filter on device team0 [ 63.188776][ T2559] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 63.197825][ T2559] bridge0: port 1(bridge_slave_0) entered blocking state [ 63.204863][ T2559] bridge0: port 1(bridge_slave_0) entered forwarding state [ 63.226297][ T2478] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 63.234922][ T2478] bridge0: port 2(bridge_slave_1) entered blocking state [ 63.242097][ T2478] bridge0: port 2(bridge_slave_1) entered forwarding state [ 63.250837][ T2478] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 63.270123][ T6833] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 63.281553][ T6833] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 63.294202][ T2478] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 63.303156][ T2478] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 63.312254][ T2478] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 63.321392][ T2478] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 63.331235][ T2478] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 63.349593][ T2559] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 63.357174][ T2559] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 63.374608][ T6833] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 63.397189][ T2478] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 63.407521][ T2478] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 63.427087][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 63.435184][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 63.446361][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 63.457203][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 63.467974][ T6833] device veth0_vlan entered promiscuous mode [ 63.480459][ T6833] device veth1_vlan entered promiscuous mode [ 63.503355][ T2559] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 63.512172][ T2559] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 63.520625][ T2559] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 63.529353][ T2559] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 63.540570][ T6833] device veth0_macvtap entered promiscuous mode [ 63.551811][ T6833] device veth1_macvtap entered promiscuous mode [ 63.569473][ T6833] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 63.578975][ T2985] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 63.587923][ T2985] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 63.597140][ T2985] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 63.606788][ T2985] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 63.619487][ T6833] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 63.632650][ T2478] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 63.643368][ T2478] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 63.813832][ T7042] ubi0: attaching mtd0 [ 63.819867][ T7042] ubi0: scanning is finished [ 63.824567][ T7042] ubi0: empty MTD device detected [ 63.900956][ T7042] ubi0: attached mtd0 (name "mtdram test device", size 0 MiB) [ 63.909789][ T7042] ubi0: PEB size: 4096 bytes (4 KiB), LEB size: 3968 bytes [ 63.918108][ T7042] ubi0: min./max. I/O unit sizes: 1/64, sub-page size 1 [ 63.925146][ T7042] ubi0: VID header offset: 64 (aligned 64), data offset: 128 [ 63.933124][ T7042] ubi0: good PEBs: 32, bad PEBs: 0, corrupted PEBs: 0 [ 63.944933][ T7042] ubi0: user volume: 0, internal volumes: 1, max. volumes count: 23 [ 63.955400][ T7042] ubi0: max/mean erase counter: 0/0, WL threshold: 4096, image sequence number: 2055715323 [ 63.969215][ T7042] ubi0: available PEBs: 28, total reserved PEBs: 4, PEBs reserved for bad PEB handling: 0 [ 63.979582][ T7045] ubi0: background thread "ubi_bgt0d" started, PID 7045 [ 64.002187][ T7048] ubi0: detaching mtd0 [ 64.011382][ T7048] ================================================================== [ 64.019586][ T7048] BUG: KASAN: use-after-free in uif_close+0x15e/0x190 [ 64.026346][ T7048] Read of size 4 at addr ffff8880888b09e8 by task syz-executor.0/7048 [ 64.034482][ T7048] [ 64.036816][ T7048] CPU: 1 PID: 7048 Comm: syz-executor.0 Not tainted 5.7.0-rc6-next-20200522-syzkaller #0 [ 64.046614][ T7048] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.057621][ T7048] Call Trace: [ 64.060953][ T7048] dump_stack+0x18f/0x20d [ 64.065288][ T7048] ? uif_close+0x15e/0x190 [ 64.069706][ T7048] ? uif_close+0x15e/0x190 [ 64.074117][ T7048] print_address_description.constprop.0.cold+0xd3/0x413 [ 64.081140][ T7048] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 64.087124][ T7048] ? vprintk_func+0x97/0x1a6 [ 64.091708][ T7048] ? uif_close+0x15e/0x190 [ 64.096122][ T7048] kasan_report.cold+0x1f/0x37 [ 64.100891][ T7048] ? uif_close+0x15e/0x190 [ 64.105283][ T7048] uif_close+0x15e/0x190 [ 64.110395][ T7048] ubi_detach_mtd_dev+0x226/0x432 [ 64.115396][ T7048] ctrl_cdev_ioctl+0x1bf/0x2b0 [ 64.120224][ T7048] ? vol_cdev_llseek+0x160/0x160 [ 64.125222][ T7048] ? __x64_sys_futex+0x380/0x4f0 [ 64.130157][ T7048] ? vol_cdev_llseek+0x160/0x160 [ 64.135083][ T7048] ksys_ioctl+0x11a/0x180 [ 64.139397][ T7048] __x64_sys_ioctl+0x6f/0xb0 [ 64.143968][ T7048] do_syscall_64+0xf6/0x7d0 [ 64.148466][ T7048] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 64.154437][ T7048] RIP: 0033:0x45ca29 [ 64.158313][ T7048] Code: 0d b7 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 64.178020][ T7048] RSP: 002b:00007fff2d27ac38 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 64.187207][ T7048] RAX: ffffffffffffffda RBX: 00000000004e1080 RCX: 000000000045ca29 [ 64.195179][ T7048] RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003 [ 64.203223][ T7048] RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 [ 64.211276][ T7048] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 64.219364][ T7048] R13: 0000000000000209 R14: 00000000004c44c1 R15: 00000000013a0914 [ 64.227365][ T7048] [ 64.229675][ T7048] Allocated by task 7042: [ 64.233991][ T7048] save_stack+0x1b/0x40 [ 64.238134][ T7048] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 64.243834][ T7048] kmem_cache_alloc_trace+0x153/0x7d0 [ 64.249195][ T7048] ubi_attach_mtd_dev+0x2e7/0x27c0 [ 64.254297][ T7048] ctrl_cdev_ioctl+0x229/0x2b0 [ 64.259067][ T7048] ksys_ioctl+0x11a/0x180 [ 64.263390][ T7048] __x64_sys_ioctl+0x6f/0xb0 [ 64.267961][ T7048] do_syscall_64+0xf6/0x7d0 [ 64.272453][ T7048] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 64.278314][ T7048] [ 64.280618][ T7048] Freed by task 7048: [ 64.284585][ T7048] save_stack+0x1b/0x40 [ 64.288726][ T7048] __kasan_slab_free+0xf7/0x140 [ 64.293558][ T7048] kfree+0x109/0x2b0 [ 64.297425][ T7048] device_release+0x71/0x200 [ 64.301986][ T7048] kobject_put+0x1c8/0x2f0 [ 64.306387][ T7048] cdev_device_del+0x69/0x80 [ 64.310965][ T7048] uif_close+0xea/0x190 [ 64.315102][ T7048] ubi_detach_mtd_dev+0x226/0x432 [ 64.320100][ T7048] ctrl_cdev_ioctl+0x1bf/0x2b0 [ 64.324836][ T7048] ksys_ioctl+0x11a/0x180 [ 64.329149][ T7048] __x64_sys_ioctl+0x6f/0xb0 [ 64.333719][ T7048] do_syscall_64+0xf6/0x7d0 [ 64.338197][ T7048] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 64.344246][ T7048] [ 64.346563][ T7048] The buggy address belongs to the object at ffff8880888b0000 [ 64.346563][ T7048] which belongs to the cache kmalloc-8k of size 8192 [ 64.360597][ T7048] The buggy address is located 2536 bytes inside of [ 64.360597][ T7048] 8192-byte region [ffff8880888b0000, ffff8880888b2000) [ 64.374059][ T7048] The buggy address belongs to the page: [ 64.379682][ T7048] page:ffffea0002222c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 head:ffffea0002222c00 order:2 compound_mapcount:0 compound_pincount:0 [ 64.394837][ T7048] flags: 0xfffe0000010200(slab|head) [ 64.400099][ T7048] raw: 00fffe0000010200 ffffea0002530b08 ffffea000253a008 ffff8880aa0021c0 [ 64.408657][ T7048] raw: 0000000000000000 ffff8880888b0000 0000000100000001 0000000000000000 [ 64.417220][ T7048] page dumped because: kasan: bad access detected [ 64.423601][ T7048] [ 64.425915][ T7048] Memory state around the buggy address: [ 64.432574][ T7048] ffff8880888b0880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.440696][ T7048] ffff8880888b0900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.448743][ T7048] >ffff8880888b0980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.456785][ T7048] ^ [ 64.464212][ T7048] ffff8880888b0a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.472245][ T7048] ffff8880888b0a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 64.480291][ T7048] ================================================================== [ 64.488320][ T7048] Disabling lock debugging due to kernel taint [ 64.501569][ T7048] Kernel panic - not syncing: panic_on_warn set ... [ 64.508176][ T7048] CPU: 1 PID: 7048 Comm: syz-executor.0 Tainted: G B 5.7.0-rc6-next-20200522-syzkaller #0 [ 64.519363][ T7048] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.529405][ T7048] Call Trace: [ 64.532673][ T7048] dump_stack+0x18f/0x20d [ 64.537001][ T7048] ? uif_close+0x110/0x190 [ 64.541483][ T7048] panic+0x2e3/0x75c [ 64.545365][ T7048] ? __warn_printk+0xf3/0xf3 [ 64.549943][ T7048] ? preempt_schedule_common+0x5e/0xc0 [ 64.555373][ T7048] ? uif_close+0x15e/0x190 [ 64.559760][ T7048] ? uif_close+0x15e/0x190 [ 64.564160][ T7048] ? preempt_schedule_thunk+0x16/0x18 [ 64.569587][ T7048] ? trace_hardirqs_on+0x55/0x230 [ 64.574640][ T7048] ? uif_close+0x15e/0x190 [ 64.579045][ T7048] ? uif_close+0x15e/0x190 [ 64.583461][ T7048] end_report+0x4d/0x53 [ 64.587595][ T7048] kasan_report.cold+0xd/0x37 [ 64.592299][ T7048] ? uif_close+0x15e/0x190 [ 64.596692][ T7048] uif_close+0x15e/0x190 [ 64.600909][ T7048] ubi_detach_mtd_dev+0x226/0x432 [ 64.605995][ T7048] ctrl_cdev_ioctl+0x1bf/0x2b0 [ 64.610731][ T7048] ? vol_cdev_llseek+0x160/0x160 [ 64.615643][ T7048] ? __x64_sys_futex+0x380/0x4f0 [ 64.620555][ T7048] ? vol_cdev_llseek+0x160/0x160 [ 64.625478][ T7048] ksys_ioctl+0x11a/0x180 [ 64.629796][ T7048] __x64_sys_ioctl+0x6f/0xb0 [ 64.634363][ T7048] do_syscall_64+0xf6/0x7d0 [ 64.638867][ T7048] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 64.644729][ T7048] RIP: 0033:0x45ca29 [ 64.648610][ T7048] Code: 0d b7 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 64.668287][ T7048] RSP: 002b:00007fff2d27ac38 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 64.676682][ T7048] RAX: ffffffffffffffda RBX: 00000000004e1080 RCX: 000000000045ca29 [ 64.684713][ T7048] RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003 [ 64.692664][ T7048] RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 [ 64.700625][ T7048] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 64.708588][ T7048] R13: 0000000000000209 R14: 00000000004c44c1 R15: 00000000013a0914 [ 64.717881][ T7048] Kernel Offset: disabled [ 64.722197][ T7048] Rebooting in 86400 seconds..