[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.159' (ECDSA) to the list of known hosts. 2021/06/21 11:46:23 parsed 1 programs 2021/06/21 11:46:23 executed programs: 0 syzkaller login: [ 1586.871154] IPVS: ftp: loaded support on port[0] = 21 [ 1586.995058] chnl_net:caif_netlink_parms(): no params data found [ 1587.118079] bridge0: port 1(bridge_slave_0) entered blocking state [ 1587.126191] bridge0: port 1(bridge_slave_0) entered disabled state [ 1587.133848] device bridge_slave_0 entered promiscuous mode [ 1587.143243] bridge0: port 2(bridge_slave_1) entered blocking state [ 1587.151513] bridge0: port 2(bridge_slave_1) entered disabled state [ 1587.159114] device bridge_slave_1 entered promiscuous mode [ 1587.180640] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 1587.190992] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 1587.213578] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 1587.221772] team0: Port device team_slave_0 added [ 1587.228563] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 1587.237598] team0: Port device team_slave_1 added [ 1587.256146] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 1587.263405] 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. [ 1587.290945] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 1587.309298] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 1587.315618] 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. [ 1587.343680] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 1587.355269] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 1587.362950] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 1587.385721] device hsr_slave_0 entered promiscuous mode [ 1587.392910] device hsr_slave_1 entered promiscuous mode [ 1587.400492] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 1587.408617] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 1587.497365] bridge0: port 2(bridge_slave_1) entered blocking state [ 1587.504068] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1587.511628] bridge0: port 1(bridge_slave_0) entered blocking state [ 1587.518252] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1587.561868] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 1587.568265] 8021q: adding VLAN 0 to HW filter on device bond0 [ 1587.577071] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 1587.587019] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 1587.607096] bridge0: port 1(bridge_slave_0) entered disabled state [ 1587.617094] bridge0: port 2(bridge_slave_1) entered disabled state [ 1587.628416] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 1587.635111] 8021q: adding VLAN 0 to HW filter on device team0 [ 1587.645446] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 1587.653817] bridge0: port 1(bridge_slave_0) entered blocking state [ 1587.660235] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1587.669446] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 1587.677740] bridge0: port 2(bridge_slave_1) entered blocking state [ 1587.684505] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1587.700483] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 1587.709016] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 1587.724911] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 1587.736659] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 1587.747631] IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready [ 1587.756058] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 1587.764011] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 1587.772579] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 1587.780717] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 1587.791779] IPv6: ADDRCONF(NETDEV_UP): vxcan0: link is not ready [ 1587.805330] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 1587.812546] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 1587.819834] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 1587.891303] IPv6: ADDRCONF(NETDEV_UP): veth0_virt_wifi: link is not ready [ 1587.902295] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 1587.947447] IPv6: ADDRCONF(NETDEV_UP): veth0_vlan: link is not ready [ 1587.954777] IPv6: ADDRCONF(NETDEV_UP): vlan0: link is not ready [ 1587.962219] IPv6: ADDRCONF(NETDEV_UP): vlan1: link is not ready [ 1587.972533] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 1587.980442] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 1587.988880] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 1587.996981] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 1588.006905] device veth0_vlan entered promiscuous mode [ 1588.016621] device veth1_vlan entered promiscuous mode [ 1588.030921] IPv6: ADDRCONF(NETDEV_UP): veth0_macvtap: link is not ready [ 1588.040012] IPv6: ADDRCONF(NETDEV_UP): veth1_macvtap: link is not ready [ 1588.052803] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 1588.061359] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 1588.070823] device veth0_macvtap entered promiscuous mode [ 1588.078157] IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready [ 1588.086892] device veth1_macvtap entered promiscuous mode [ 1588.093042] IPv6: ADDRCONF(NETDEV_UP): macsec0: link is not ready [ 1588.101587] IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready [ 1588.111658] IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready [ 1588.121554] IPv6: ADDRCONF(NETDEV_UP): batadv_slave_0: link is not ready [ 1588.129557] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 1588.136848] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 1588.144306] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 1588.151786] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 1588.164364] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 1588.177343] IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready [ 1588.184508] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 1588.192592] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 1588.201605] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 1588.715259] ================================================================== [ 1588.723271] BUG: KASAN: use-after-free in vgem_gem_dumb_create+0x200/0x210 [ 1588.730437] Read of size 8 at addr ffff8880aaf42b80 by task syz-executor.0/8334 [ 1588.738265] [ 1588.740023] CPU: 1 PID: 8334 Comm: syz-executor.0 Not tainted 4.14.237-syzkaller #0 [ 1588.748009] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1588.757377] Call Trace: [ 1588.759996] dump_stack+0x1b2/0x281 [ 1588.763742] print_address_description.cold+0x54/0x1d3 [ 1588.769118] kasan_report_error.cold+0x8a/0x191 [ 1588.773806] ? vgem_gem_dumb_create+0x200/0x210 [ 1588.778496] __asan_report_load8_noabort+0x68/0x70 [ 1588.783784] ? vgem_gem_dumb_create+0x200/0x210 [ 1588.788717] vgem_gem_dumb_create+0x200/0x210 [ 1588.793304] drm_mode_create_dumb_ioctl+0x221/0x2b0 [ 1588.798660] ? __drm_printfn_debug+0x70/0x70 [ 1588.803375] drm_ioctl_kernel+0x14c/0x200 [ 1588.808016] drm_ioctl+0x419/0x870 [ 1588.811648] ? __drm_printfn_debug+0x70/0x70 [ 1588.816288] ? drm_getstats+0x20/0x20 [ 1588.820186] ? futex_exit_release+0x220/0x220 [ 1588.825025] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 1588.830599] ? debug_check_no_obj_freed+0x2c0/0x680 [ 1588.835619] ? drm_getstats+0x20/0x20 [ 1588.839593] do_vfs_ioctl+0x75a/0xff0 [ 1588.843500] ? ioctl_preallocate+0x1a0/0x1a0 [ 1588.848160] ? lock_downgrade+0x740/0x740 [ 1588.852335] ? __fget+0x225/0x360 [ 1588.855867] ? do_vfs_ioctl+0xff0/0xff0 [ 1588.859912] ? security_file_ioctl+0x83/0xb0 [ 1588.864520] SyS_ioctl+0x7f/0xb0 [ 1588.868122] ? do_vfs_ioctl+0xff0/0xff0 [ 1588.872686] do_syscall_64+0x1d5/0x640 [ 1588.876773] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1588.882173] RIP: 0033:0x4665d9 [ 1588.885356] RSP: 002b:00007f5a6372a188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1588.893081] RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 [ 1588.900670] RDX: 00000000200000c0 RSI: 00000000c02064b2 RDI: 0000000000000004 [ 1588.908025] RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 [ 1588.915385] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 [ 1588.922747] R13: 00007ffc22dc987f R14: 00007f5a6372a300 R15: 0000000000022000 [ 1588.930015] [ 1588.931646] Allocated by task 8334: [ 1588.935539] kasan_kmalloc+0xeb/0x160 [ 1588.939336] kmem_cache_alloc_trace+0x131/0x3d0 [ 1588.944012] __vgem_gem_create+0x44/0xe0 [ 1588.948242] vgem_gem_dumb_create+0xc5/0x210 [ 1588.952777] drm_mode_create_dumb_ioctl+0x221/0x2b0 [ 1588.957957] drm_ioctl_kernel+0x14c/0x200 [ 1588.962089] drm_ioctl+0x419/0x870 [ 1588.965610] do_vfs_ioctl+0x75a/0xff0 [ 1588.969387] SyS_ioctl+0x7f/0xb0 [ 1588.972743] do_syscall_64+0x1d5/0x640 [ 1588.977050] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1588.982228] [ 1588.983841] Freed by task 8334: [ 1588.987119] kasan_slab_free+0xc3/0x1a0 [ 1588.991095] kfree+0xc9/0x250 [ 1588.994202] drm_gem_object_free+0x8f/0x150 [ 1588.998698] drm_gem_object_put_unlocked+0xc3/0x160 [ 1589.003725] vgem_gem_dumb_create+0xf2/0x210 [ 1589.008222] drm_mode_create_dumb_ioctl+0x221/0x2b0 [ 1589.013256] drm_ioctl_kernel+0x14c/0x200 [ 1589.017486] drm_ioctl+0x419/0x870 [ 1589.021216] do_vfs_ioctl+0x75a/0xff0 [ 1589.025153] SyS_ioctl+0x7f/0xb0 [ 1589.028599] do_syscall_64+0x1d5/0x640 [ 1589.032736] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1589.038140] [ 1589.040009] The buggy address belongs to the object at ffff8880aaf42a80 [ 1589.040009] which belongs to the cache kmalloc-512 of size 512 [ 1589.056358] The buggy address is located 256 bytes inside of [ 1589.056358] 512-byte region [ffff8880aaf42a80, ffff8880aaf42c80) [ 1589.068312] The buggy address belongs to the page: [ 1589.073331] page:ffffea0002abd080 count:1 mapcount:0 mapping:ffff8880aaf42080 index:0x0 [ 1589.081465] flags: 0xfff00000000100(slab) [ 1589.085612] raw: 00fff00000000100 ffff8880aaf42080 0000000000000000 0000000100000006 [ 1589.093475] raw: ffffea0002a7c9a0 ffffea0002a7c820 ffff88813fe80940 0000000000000000 [ 1589.101609] page dumped because: kasan: bad access detected [ 1589.108619] [ 1589.110229] Memory state around the buggy address: [ 1589.115207] ffff8880aaf42a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1589.122562] ffff8880aaf42b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1589.130108] >ffff8880aaf42b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1589.137450] ^ [ 1589.140902] ffff8880aaf42c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1589.148608] ffff8880aaf42c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 1589.156264] ================================================================== [ 1589.163810] Disabling lock debugging due to kernel taint [ 1589.170264] Bluetooth: hci0 command 0x0409 tx timeout [ 1589.179164] Kernel panic - not syncing: panic_on_warn set ... [ 1589.179164] [ 1589.186544] CPU: 1 PID: 8334 Comm: syz-executor.0 Tainted: G B 4.14.237-syzkaller #0 [ 1589.195549] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1589.204900] Call Trace: [ 1589.207595] dump_stack+0x1b2/0x281 [ 1589.211230] panic+0x1f9/0x42d [ 1589.214431] ? add_taint.cold+0x16/0x16 [ 1589.218678] ? ___preempt_schedule+0x16/0x18 [ 1589.223235] kasan_end_report+0x43/0x49 [ 1589.227319] kasan_report_error.cold+0xa7/0x191 [ 1589.232027] ? vgem_gem_dumb_create+0x200/0x210 [ 1589.236738] __asan_report_load8_noabort+0x68/0x70 [ 1589.241798] ? vgem_gem_dumb_create+0x200/0x210 [ 1589.246609] vgem_gem_dumb_create+0x200/0x210 [ 1589.251362] drm_mode_create_dumb_ioctl+0x221/0x2b0 [ 1589.256622] ? __drm_printfn_debug+0x70/0x70 [ 1589.261347] drm_ioctl_kernel+0x14c/0x200 [ 1589.265478] drm_ioctl+0x419/0x870 [ 1589.269247] ? __drm_printfn_debug+0x70/0x70 [ 1589.273804] ? drm_getstats+0x20/0x20 [ 1589.277761] ? futex_exit_release+0x220/0x220 [ 1589.282366] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 1589.287474] ? debug_check_no_obj_freed+0x2c0/0x680 [ 1589.294722] ? drm_getstats+0x20/0x20 [ 1589.298556] do_vfs_ioctl+0x75a/0xff0 [ 1589.302547] ? ioctl_preallocate+0x1a0/0x1a0 [ 1589.306939] ? lock_downgrade+0x740/0x740 [ 1589.311157] ? __fget+0x225/0x360 [ 1589.314590] ? do_vfs_ioctl+0xff0/0xff0 [ 1589.318541] ? security_file_ioctl+0x83/0xb0 [ 1589.322951] SyS_ioctl+0x7f/0xb0 [ 1589.326887] ? do_vfs_ioctl+0xff0/0xff0 [ 1589.331129] do_syscall_64+0x1d5/0x640 [ 1589.335408] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1589.340763] RIP: 0033:0x4665d9 [ 1589.345816] RSP: 002b:00007f5a6372a188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1589.353593] RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 [ 1589.361168] RDX: 00000000200000c0 RSI: 00000000c02064b2 RDI: 0000000000000004 [ 1589.368424] RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 [ 1589.375677] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 [ 1589.383025] R13: 00007ffc22dc987f R14: 00007f5a6372a300 R15: 0000000000022000 [ 1589.391881] Kernel Offset: disabled [ 1589.395673] Rebooting in 86400 seconds..