[ 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 '10.128.1.49' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 43.654505] ================================================================== [ 43.662077] BUG: KASAN: use-after-free in vgem_gem_dumb_create+0x22c/0x240 [ 43.669097] Read of size 8 at addr ffff8880a4cfc100 by task syz-executor757/11282 [ 43.676701] [ 43.678330] CPU: 1 PID: 11282 Comm: syz-executor757 Not tainted 4.19.167-syzkaller #0 [ 43.686307] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.695668] Call Trace: [ 43.698261] dump_stack+0x1fc/0x2fe executing program executing program executing program executing program executing program [ 43.701911] print_address_description.cold+0x54/0x219 [ 43.707205] kasan_report_error.cold+0x8a/0x1c7 [ 43.711901] ? vgem_gem_dumb_create+0x22c/0x240 [ 43.716593] __asan_report_load8_noabort+0x88/0x90 [ 43.721555] ? drm_gem_object_put_unlocked+0xa0/0x180 [ 43.726772] ? vgem_gem_dumb_create+0x22c/0x240 [ 43.731466] vgem_gem_dumb_create+0x22c/0x240 [ 43.736036] drm_mode_create_dumb+0x27c/0x300 [ 43.740548] drm_ioctl_kernel+0x208/0x2a0 [ 43.744743] ? drm_mode_create_dumb+0x300/0x300 [ 43.749428] ? drm_ioctl_permit+0x210/0x210 [ 43.753775] ? __might_fault+0x192/0x1d0 [ 43.757906] drm_ioctl+0x507/0x9c0 [ 43.761443] ? drm_mode_create_dumb+0x300/0x300 [ 43.766104] ? drm_getstats+0x20/0x20 [ 43.769948] ? cmp_ex_sort+0xc0/0xc0 [ 43.773673] ? __do_page_fault+0x180/0xd60 [ 43.777905] ? retint_kernel+0x2d/0x2d [ 43.781790] ? exit_robust_list+0x2e0/0x2e0 [ 43.786105] ? drm_getstats+0x20/0x20 [ 43.789916] do_vfs_ioctl+0xcdb/0x12e0 [ 43.793810] ? lock_downgrade+0x720/0x720 [ 43.797957] ? check_preemption_disabled+0x41/0x280 [ 43.803002] ? ioctl_preallocate+0x200/0x200 [ 43.807405] ? __fget+0x356/0x510 [ 43.810848] ? do_dup2+0x450/0x450 [ 43.814385] ? __se_sys_futex+0x298/0x3b0 [ 43.818543] ksys_ioctl+0x9b/0xc0 [ 43.821992] __x64_sys_ioctl+0x6f/0xb0 [ 43.825870] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 43.830452] do_syscall_64+0xf9/0x620 [ 43.834245] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 43.839426] RIP: 0033:0x44a659 [ 43.842605] Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 fb ca fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 43.861494] RSP: 002b:00007f567cf7adb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 43.869190] RAX: ffffffffffffffda RBX: 00000000006dbc48 RCX: 000000000044a659 [ 43.876451] RDX: 00000000200000c0 RSI: 00000000c02064b2 RDI: 0000000000000005 [ 43.883744] RBP: 00000000006dbc40 R08: 0000000000000000 R09: 0000000000000000 [ 43.891014] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc4c [ 43.898284] R13: 00007ffdfcb58a5f R14: 00007f567cf7b9c0 R15: 0000000000000000 [ 43.905550] [ 43.907172] Allocated by task 11282: [ 43.910875] kmem_cache_alloc_trace+0x12f/0x380 [ 43.915532] __vgem_gem_create+0x44/0xf0 [ 43.919580] vgem_gem_dumb_create+0xcf/0x240 [ 43.923984] drm_mode_create_dumb+0x27c/0x300 [ 43.928467] drm_ioctl_kernel+0x208/0x2a0 [ 43.932601] drm_ioctl+0x507/0x9c0 [ 43.936137] do_vfs_ioctl+0xcdb/0x12e0 [ 43.940024] ksys_ioctl+0x9b/0xc0 [ 43.943482] __x64_sys_ioctl+0x6f/0xb0 [ 43.947365] do_syscall_64+0xf9/0x620 [ 43.951166] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 43.956340] [ 43.957984] Freed by task 11282: [ 43.961351] kfree+0xcc/0x210 [ 43.964458] drm_gem_object_free+0x91/0x1c0 [ 43.968765] drm_gem_object_put_unlocked+0xd1/0x180 [ 43.973767] vgem_gem_dumb_create+0x10c/0x240 [ 43.978263] drm_mode_create_dumb+0x27c/0x300 [ 43.982750] drm_ioctl_kernel+0x208/0x2a0 [ 43.987009] drm_ioctl+0x507/0x9c0 [ 43.990594] do_vfs_ioctl+0xcdb/0x12e0 [ 43.994509] ksys_ioctl+0x9b/0xc0 [ 43.997948] __x64_sys_ioctl+0x6f/0xb0 [ 44.001821] do_syscall_64+0xf9/0x620 [ 44.005621] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 44.010792] [ 44.012403] The buggy address belongs to the object at ffff8880a4cfc000 [ 44.012403] which belongs to the cache kmalloc-512 of size 512 [ 44.025053] The buggy address is located 256 bytes inside of [ 44.025053] 512-byte region [ffff8880a4cfc000, ffff8880a4cfc200) [ 44.036925] The buggy address belongs to the page: [ 44.041844] page:ffffea0002933f00 count:1 mapcount:0 mapping:ffff88813bff0940 index:0x0 [ 44.049984] flags: 0xfff00000000100(slab) [ 44.054134] raw: 00fff00000000100 ffffea0002925088 ffffea00028ccec8 ffff88813bff0940 [ 44.062006] raw: 0000000000000000 ffff8880a4cfc000 0000000100000006 0000000000000000 [ 44.069872] page dumped because: kasan: bad access detected [ 44.075564] [ 44.077171] Memory state around the buggy address: [ 44.082118] ffff8880a4cfc000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 44.089472] ffff8880a4cfc080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 44.096822] >ffff8880a4cfc100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb executing program executing program executing program [ 44.104187] ^ [ 44.107537] ffff8880a4cfc180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 44.114901] ffff8880a4cfc200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 44.122260] ================================================================== [ 44.129607] Disabling lock debugging due to kernel taint [ 44.145256] Kernel panic - not syncing: panic_on_warn set ... [ 44.145256] executing program executing program executing program executing program [ 44.152663] CPU: 0 PID: 11282 Comm: syz-executor757 Tainted: G B 4.19.167-syzkaller #0 [ 44.162030] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.171390] Call Trace: [ 44.174030] dump_stack+0x1fc/0x2fe [ 44.177717] panic+0x26a/0x50e [ 44.180918] ? __warn_printk+0xf3/0xf3 [ 44.184827] ? preempt_schedule_common+0x45/0xc0 [ 44.189609] ? ___preempt_schedule+0x16/0x18 [ 44.194029] ? trace_hardirqs_on+0x55/0x210 [ 44.198364] kasan_end_report+0x43/0x49 [ 44.202362] kasan_report_error.cold+0xa7/0x1c7 executing program executing program executing program executing program executing program [ 44.207051] ? vgem_gem_dumb_create+0x22c/0x240 [ 44.211739] __asan_report_load8_noabort+0x88/0x90 [ 44.216685] ? drm_gem_object_put_unlocked+0xa0/0x180 [ 44.221934] ? vgem_gem_dumb_create+0x22c/0x240 [ 44.226613] vgem_gem_dumb_create+0x22c/0x240 [ 44.231115] drm_mode_create_dumb+0x27c/0x300 [ 44.235631] drm_ioctl_kernel+0x208/0x2a0 [ 44.239795] ? drm_mode_create_dumb+0x300/0x300 [ 44.244477] ? drm_ioctl_permit+0x210/0x210 [ 44.248832] ? __might_fault+0x192/0x1d0 [ 44.252899] drm_ioctl+0x507/0x9c0 executing program executing program executing program executing program executing program executing program [ 44.256447] ? drm_mode_create_dumb+0x300/0x300 [ 44.261130] ? drm_getstats+0x20/0x20 [ 44.264965] ? cmp_ex_sort+0xc0/0xc0 [ 44.268694] ? __do_page_fault+0x180/0xd60 [ 44.272942] ? retint_kernel+0x2d/0x2d [ 44.276886] ? exit_robust_list+0x2e0/0x2e0 [ 44.281200] ? drm_getstats+0x20/0x20 [ 44.285003] do_vfs_ioctl+0xcdb/0x12e0 [ 44.288898] ? lock_downgrade+0x720/0x720 [ 44.293050] ? check_preemption_disabled+0x41/0x280 [ 44.298080] ? ioctl_preallocate+0x200/0x200 [ 44.302509] ? __fget+0x356/0x510 [ 44.305969] ? do_dup2+0x450/0x450 [ 44.309509] ? __se_sys_futex+0x298/0x3b0 [ 44.313698] ksys_ioctl+0x9b/0xc0 [ 44.317142] __x64_sys_ioctl+0x6f/0xb0 [ 44.321031] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 44.325620] do_syscall_64+0xf9/0x620 [ 44.329480] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 44.334659] RIP: 0033:0x44a659 [ 44.337848] Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 fb ca fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 44.356764] RSP: 002b:00007f567cf7adb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 44.364489] RAX: ffffffffffffffda RBX: 00000000006dbc48 RCX: 000000000044a659 [ 44.371776] RDX: 00000000200000c0 RSI: 00000000c02064b2 RDI: 0000000000000005 [ 44.379053] RBP: 00000000006dbc40 R08: 0000000000000000 R09: 0000000000000000 [ 44.386327] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc4c [ 44.393608] R13: 00007ffdfcb58a5f R14: 00007f567cf7b9c0 R15: 0000000000000000 [ 44.401326] Kernel Offset: disabled [ 44.404954] Rebooting in 86400 seconds..