[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 61.345511][ T26] audit: type=1800 audit(1581404063.711:25): pid=8741 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 61.364555][ T26] audit: type=1800 audit(1581404063.711:26): pid=8741 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 61.414638][ T26] audit: type=1800 audit(1581404063.721:27): pid=8741 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.92' (ECDSA) to the list of known hosts. 2020/02/11 07:09:52 parsed 1 programs 2020/02/11 07:09:54 executed programs: 0 syzkaller login: [ 992.336681][ T8914] IPVS: ftp: loaded support on port[0] = 21 [ 992.384453][ T8914] chnl_net:caif_netlink_parms(): no params data found [ 992.416209][ T8914] bridge0: port 1(bridge_slave_0) entered blocking state [ 992.423597][ T8914] bridge0: port 1(bridge_slave_0) entered disabled state [ 992.431303][ T8914] device bridge_slave_0 entered promiscuous mode [ 992.439760][ T8914] bridge0: port 2(bridge_slave_1) entered blocking state [ 992.447118][ T8914] bridge0: port 2(bridge_slave_1) entered disabled state [ 992.454666][ T8914] device bridge_slave_1 entered promiscuous mode [ 992.470321][ T8914] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 992.481168][ T8914] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 992.499408][ T8914] team0: Port device team_slave_0 added [ 992.506477][ T8914] team0: Port device team_slave_1 added [ 992.519414][ T8914] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 992.526426][ T8914] 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. [ 992.552944][ T8914] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 992.565430][ T8914] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 992.572475][ T8914] 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. [ 992.598567][ T8914] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 992.675464][ T8914] device hsr_slave_0 entered promiscuous mode [ 992.743692][ T8914] device hsr_slave_1 entered promiscuous mode [ 992.864511][ T8914] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 992.906199][ T8914] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 992.975211][ T8914] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 993.035747][ T8914] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 993.084032][ T8914] bridge0: port 2(bridge_slave_1) entered blocking state [ 993.091204][ T8914] bridge0: port 2(bridge_slave_1) entered forwarding state [ 993.099072][ T8914] bridge0: port 1(bridge_slave_0) entered blocking state [ 993.106162][ T8914] bridge0: port 1(bridge_slave_0) entered forwarding state [ 993.142234][ T8914] 8021q: adding VLAN 0 to HW filter on device bond0 [ 993.158898][ T8914] 8021q: adding VLAN 0 to HW filter on device team0 [ 993.167306][ T8915] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 993.177331][ T8915] bridge0: port 1(bridge_slave_0) entered disabled state [ 993.185601][ T8915] bridge0: port 2(bridge_slave_1) entered disabled state [ 993.193878][ T8915] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 993.213982][ T3163] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 993.222476][ T3163] bridge0: port 1(bridge_slave_0) entered blocking state [ 993.229596][ T3163] bridge0: port 1(bridge_slave_0) entered forwarding state [ 993.237150][ T3163] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 993.245925][ T3163] bridge0: port 2(bridge_slave_1) entered blocking state [ 993.253022][ T3163] bridge0: port 2(bridge_slave_1) entered forwarding state [ 993.265125][ T3207] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 993.275477][ T3207] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 993.290047][ T8914] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 993.301628][ T8914] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 993.315935][ T8924] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 993.324331][ T8924] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 993.332990][ T8924] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 993.342263][ T8924] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 993.357984][ T3207] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 993.365452][ T3207] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 993.378417][ T8914] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 993.395596][ T8924] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 993.413352][ T8914] device veth0_vlan entered promiscuous mode [ 993.420487][ T8922] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 993.429009][ T8922] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 993.444440][ T8922] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 993.452085][ T8922] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 993.460794][ T8914] device veth1_vlan entered promiscuous mode [ 993.478469][ T8924] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 993.486799][ T8924] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 993.494919][ T8924] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 993.503176][ T8924] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 993.513750][ T8914] device veth0_macvtap entered promiscuous mode [ 993.522399][ T8914] device veth1_macvtap entered promiscuous mode [ 993.537500][ T8914] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 993.545125][ T8922] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 993.554264][ T8922] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 993.562153][ T8922] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 993.571103][ T8922] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 993.582956][ T8914] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 993.590503][ T8924] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 993.600226][ T8924] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready 2020/02/11 07:09:59 executed programs: 195 2020/02/11 07:10:04 executed programs: 489 2020/02/11 07:10:09 executed programs: 794 2020/02/11 07:10:14 executed programs: 1087 [ 1015.968029][T13662] ================================================================== [ 1015.976442][T13662] BUG: KASAN: use-after-free in vgem_gem_dumb_create+0x178/0x320 [ 1015.984211][T13662] Read of size 8 at addr ffff8880a3083108 by task syz-executor.0/13662 [ 1015.992431][T13662] [ 1015.994752][T13662] CPU: 0 PID: 13662 Comm: syz-executor.0 Not tainted 5.6.0-rc1-syzkaller #0 [ 1016.003419][T13662] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1016.013467][T13662] Call Trace: [ 1016.016828][T13662] dump_stack+0x1fb/0x318 [ 1016.021243][T13662] print_address_description+0x74/0x5c0 [ 1016.026846][T13662] ? vprintk_default+0x28/0x30 [ 1016.031606][T13662] ? vprintk_func+0x158/0x170 [ 1016.036380][T13662] ? printk+0x62/0x8d [ 1016.040377][T13662] __kasan_report+0x149/0x1c0 [ 1016.045154][T13662] ? vgem_gem_dumb_create+0x178/0x320 [ 1016.050528][T13662] kasan_report+0x26/0x50 [ 1016.054849][T13662] __asan_report_load8_noabort+0x14/0x20 [ 1016.060534][T13662] vgem_gem_dumb_create+0x178/0x320 [ 1016.065847][T13662] drm_mode_create_dumb_ioctl+0x22e/0x2a0 [ 1016.071643][T13662] drm_ioctl_kernel+0x2cf/0x410 [ 1016.076490][T13662] ? drm_mode_create_dumb+0x2a0/0x2a0 [ 1016.081866][T13662] drm_ioctl+0x52f/0x890 [ 1016.086104][T13662] ? drm_mode_create_dumb+0x2a0/0x2a0 [ 1016.091542][T13662] ? do_vfs_ioctl+0x758/0x19d0 [ 1016.096364][T13662] ? tomoyo_file_ioctl+0x23/0x30 [ 1016.101309][T13662] ? drm_ioctl_kernel+0x410/0x410 [ 1016.106407][T13662] __se_sys_ioctl+0x113/0x190 [ 1016.111088][T13662] __x64_sys_ioctl+0x7b/0x90 [ 1016.115733][T13662] do_syscall_64+0xf7/0x1c0 [ 1016.120295][T13662] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1016.126180][T13662] RIP: 0033:0x45b3b9 [ 1016.130180][T13662] 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 [ 1016.149874][T13662] RSP: 002b:00007ff464255c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1016.158274][T13662] RAX: ffffffffffffffda RBX: 00007ff4642566d4 RCX: 000000000045b3b9 [ 1016.166270][T13662] RDX: 0000000020000140 RSI: 00000000c02064b2 RDI: 0000000000000003 [ 1016.174244][T13662] RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 [ 1016.182206][T13662] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 1016.190174][T13662] R13: 0000000000000285 R14: 00000000004d15b0 R15: 000000000075bf2c [ 1016.198146][T13662] [ 1016.200455][T13662] Allocated by task 13662: [ 1016.204921][T13662] __kasan_kmalloc+0x118/0x1c0 [ 1016.209672][T13662] kasan_kmalloc+0x9/0x10 [ 1016.213988][T13662] kmem_cache_alloc_trace+0x221/0x2f0 [ 1016.219392][T13662] vgem_gem_dumb_create+0xd8/0x320 [ 1016.224483][T13662] drm_mode_create_dumb_ioctl+0x22e/0x2a0 [ 1016.230184][T13662] drm_ioctl_kernel+0x2cf/0x410 [ 1016.235052][T13662] drm_ioctl+0x52f/0x890 [ 1016.239277][T13662] __se_sys_ioctl+0x113/0x190 [ 1016.243941][T13662] __x64_sys_ioctl+0x7b/0x90 [ 1016.248515][T13662] do_syscall_64+0xf7/0x1c0 [ 1016.253010][T13662] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1016.258880][T13662] [ 1016.261190][T13662] Freed by task 13662: [ 1016.265352][T13662] __kasan_slab_free+0x12e/0x1e0 [ 1016.270327][T13662] kasan_slab_free+0xe/0x10 [ 1016.274820][T13662] kfree+0x10d/0x220 [ 1016.278693][T13662] vgem_gem_free_object+0xb5/0xc0 [ 1016.283751][T13662] drm_gem_object_put_unlocked+0x33a/0x4b0 [ 1016.289669][T13662] vgem_gem_dumb_create+0x265/0x320 [ 1016.294849][T13662] drm_mode_create_dumb_ioctl+0x22e/0x2a0 [ 1016.300551][T13662] drm_ioctl_kernel+0x2cf/0x410 [ 1016.305385][T13662] drm_ioctl+0x52f/0x890 [ 1016.309609][T13662] __se_sys_ioctl+0x113/0x190 [ 1016.314268][T13662] __x64_sys_ioctl+0x7b/0x90 [ 1016.318836][T13662] do_syscall_64+0xf7/0x1c0 [ 1016.323327][T13662] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1016.329212][T13662] [ 1016.331594][T13662] The buggy address belongs to the object at ffff8880a3083000 [ 1016.331594][T13662] which belongs to the cache kmalloc-1k of size 1024 [ 1016.345636][T13662] The buggy address is located 264 bytes inside of [ 1016.345636][T13662] 1024-byte region [ffff8880a3083000, ffff8880a3083400) [ 1016.358979][T13662] The buggy address belongs to the page: [ 1016.364599][T13662] page:ffffea00028c20c0 refcount:1 mapcount:0 mapping:ffff8880aa400c40 index:0xffff8880a3083800 [ 1016.375012][T13662] flags: 0xfffe0000000200(slab) [ 1016.379980][T13662] raw: 00fffe0000000200 ffffea00027a4f08 ffffea000243ed48 ffff8880aa400c40 [ 1016.388549][T13662] raw: ffff8880a3083800 ffff8880a3083000 0000000100000001 0000000000000000 [ 1016.397112][T13662] page dumped because: kasan: bad access detected [ 1016.403504][T13662] [ 1016.405809][T13662] Memory state around the buggy address: [ 1016.411427][T13662] ffff8880a3083000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1016.419474][T13662] ffff8880a3083080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1016.427668][T13662] >ffff8880a3083100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1016.435763][T13662] ^ [ 1016.440124][T13662] ffff8880a3083180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1016.448169][T13662] ffff8880a3083200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1016.456282][T13662] ================================================================== [ 1016.464327][T13662] Disabling lock debugging due to kernel taint [ 1016.471749][T13662] Kernel panic - not syncing: panic_on_warn set ... [ 1016.478340][T13662] CPU: 0 PID: 13662 Comm: syz-executor.0 Tainted: G B 5.6.0-rc1-syzkaller #0 [ 1016.488384][T13662] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1016.498429][T13662] Call Trace: [ 1016.501749][T13662] dump_stack+0x1fb/0x318 [ 1016.506140][T13662] panic+0x264/0x7a9 [ 1016.510018][T13662] ? __kasan_report+0x193/0x1c0 [ 1016.514887][T13662] ? trace_hardirqs_on+0x34/0x80 [ 1016.519806][T13662] ? __kasan_report+0x193/0x1c0 [ 1016.524645][T13662] __kasan_report+0x1b9/0x1c0 [ 1016.529316][T13662] ? vgem_gem_dumb_create+0x178/0x320 [ 1016.534684][T13662] kasan_report+0x26/0x50 [ 1016.539008][T13662] __asan_report_load8_noabort+0x14/0x20 [ 1016.544643][T13662] vgem_gem_dumb_create+0x178/0x320 [ 1016.549823][T13662] drm_mode_create_dumb_ioctl+0x22e/0x2a0 [ 1016.555523][T13662] drm_ioctl_kernel+0x2cf/0x410 [ 1016.560361][T13662] ? drm_mode_create_dumb+0x2a0/0x2a0 [ 1016.565737][T13662] drm_ioctl+0x52f/0x890 [ 1016.569969][T13662] ? drm_mode_create_dumb+0x2a0/0x2a0 [ 1016.575344][T13662] ? do_vfs_ioctl+0x758/0x19d0 [ 1016.580117][T13662] ? tomoyo_file_ioctl+0x23/0x30 [ 1016.585049][T13662] ? drm_ioctl_kernel+0x410/0x410 [ 1016.590098][T13662] __se_sys_ioctl+0x113/0x190 [ 1016.594757][T13662] __x64_sys_ioctl+0x7b/0x90 [ 1016.599338][T13662] do_syscall_64+0xf7/0x1c0 [ 1016.603852][T13662] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1016.609720][T13662] RIP: 0033:0x45b3b9 [ 1016.613588][T13662] 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 [ 1016.633174][T13662] RSP: 002b:00007ff464255c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1016.641569][T13662] RAX: ffffffffffffffda RBX: 00007ff4642566d4 RCX: 000000000045b3b9 [ 1016.649606][T13662] RDX: 0000000020000140 RSI: 00000000c02064b2 RDI: 0000000000000003 [ 1016.657603][T13662] RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 [ 1016.665566][T13662] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 1016.673635][T13662] R13: 0000000000000285 R14: 00000000004d15b0 R15: 000000000075bf2c [ 1016.682880][T13662] Kernel Offset: disabled [ 1016.687209][T13662] Rebooting in 86400 seconds..