Warning: Permanently added '10.128.1.15' (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 [ 47.845974] ================================================================== [ 47.853528] BUG: KASAN: use-after-free in vgem_gem_dumb_create+0x22c/0x240 [ 47.860572] Read of size 8 at addr ffff8880b482cdc0 by task syz-executor601/8354 [ 47.868106] [ 47.869835] CPU: 0 PID: 8354 Comm: syz-executor601 Not tainted 4.19.188-syzkaller #0 [ 47.877742] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.887262] Call Trace: [ 47.889856] dump_stack+0x1fc/0x2ef executing program executing program executing program executing program executing program executing program [ 47.893499] print_address_description.cold+0x54/0x219 [ 47.898787] kasan_report_error.cold+0x8a/0x1b9 [ 47.903466] ? vgem_gem_dumb_create+0x22c/0x240 [ 47.908143] __asan_report_load8_noabort+0x88/0x90 [ 47.913082] ? drm_gem_object_put_unlocked+0xc0/0x180 [ 47.918277] ? vgem_gem_dumb_create+0x22c/0x240 [ 47.922952] vgem_gem_dumb_create+0x22c/0x240 [ 47.927456] drm_mode_create_dumb+0x27c/0x300 [ 47.931962] drm_ioctl_kernel+0x208/0x2a0 [ 47.936115] ? drm_mode_create_dumb+0x300/0x300 [ 47.940790] ? drm_ioctl_permit+0x210/0x210 [ 47.945112] ? __might_fault+0x192/0x1d0 [ 47.949175] drm_ioctl+0x507/0x9c0 [ 47.952725] ? drm_mode_create_dumb+0x300/0x300 [ 47.957391] ? drm_getstats+0x20/0x20 [ 47.961195] ? debug_check_no_obj_freed+0x201/0x490 [ 47.966244] ? futex_exit_release+0x220/0x220 [ 47.970735] ? lock_acquire+0x170/0x3c0 [ 47.974809] ? debug_check_no_obj_freed+0xb5/0x490 [ 47.979736] ? drm_getstats+0x20/0x20 [ 47.983528] do_vfs_ioctl+0xcdb/0x12e0 [ 47.987420] ? lock_downgrade+0x720/0x720 [ 47.991557] ? check_preemption_disabled+0x41/0x280 [ 47.996564] ? ioctl_preallocate+0x200/0x200 [ 48.000960] ? __fget+0x356/0x510 [ 48.004418] ? do_dup2+0x450/0x450 [ 48.007946] ? __se_sys_futex+0x298/0x3b0 [ 48.012083] ksys_ioctl+0x9b/0xc0 [ 48.015526] __x64_sys_ioctl+0x6f/0xb0 [ 48.019398] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 48.023963] do_syscall_64+0xf9/0x620 [ 48.027753] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.033014] RIP: 0033:0x449f09 [ 48.036192] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 [ 48.055106] RSP: 002b:00007fa6a4313308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 48.062861] RAX: ffffffffffffffda RBX: 00000000004ca438 RCX: 0000000000449f09 [ 48.070903] RDX: 00000000200000c0 RSI: 00000000c02064b2 RDI: 0000000000000004 [ 48.078159] RBP: 00000000004ca430 R08: 0000000000000000 R09: 0000000000000000 [ 48.085416] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004ca43c [ 48.092672] R13: 000000000049a074 R14: 6972642f7665642f R15: 0000000000022000 [ 48.099950] [ 48.101560] Allocated by task 8354: [ 48.105178] kmem_cache_alloc_trace+0x12f/0x380 [ 48.109834] __vgem_gem_create+0x44/0xf0 [ 48.113881] vgem_gem_dumb_create+0xcf/0x240 [ 48.118274] drm_mode_create_dumb+0x27c/0x300 [ 48.122753] drm_ioctl_kernel+0x208/0x2a0 [ 48.126904] drm_ioctl+0x507/0x9c0 [ 48.130429] do_vfs_ioctl+0xcdb/0x12e0 [ 48.134297] ksys_ioctl+0x9b/0xc0 [ 48.137734] __x64_sys_ioctl+0x6f/0xb0 [ 48.141603] do_syscall_64+0xf9/0x620 [ 48.145390] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.150557] [ 48.152165] Freed by task 8354: [ 48.155514] kfree+0xcc/0x210 [ 48.158604] drm_gem_object_free+0x91/0x1c0 [ 48.162909] drm_gem_object_put_unlocked+0xd1/0x180 [ 48.167910] vgem_gem_dumb_create+0x10c/0x240 [ 48.172394] drm_mode_create_dumb+0x27c/0x300 [ 48.176873] drm_ioctl_kernel+0x208/0x2a0 [ 48.181002] drm_ioctl+0x507/0x9c0 [ 48.184541] do_vfs_ioctl+0xcdb/0x12e0 [ 48.188411] ksys_ioctl+0x9b/0xc0 [ 48.191848] __x64_sys_ioctl+0x6f/0xb0 [ 48.195718] do_syscall_64+0xf9/0x620 [ 48.199504] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.204670] [ 48.206282] The buggy address belongs to the object at ffff8880b482ccc0 [ 48.206282] which belongs to the cache kmalloc-512 of size 512 [ 48.218933] The buggy address is located 256 bytes inside of [ 48.218933] 512-byte region [ffff8880b482ccc0, ffff8880b482cec0) [ 48.230799] The buggy address belongs to the page: [ 48.235718] page:ffffea0002d20b00 count:1 mapcount:0 mapping:ffff88813bff0940 index:0x0 [ 48.243841] flags: 0xfff00000000100(slab) [ 48.247978] raw: 00fff00000000100 ffffea000259dbc8 ffffea0002d6edc8 ffff88813bff0940 [ 48.255861] raw: 0000000000000000 ffff8880b482c040 0000000100000006 0000000000000000 [ 48.263728] page dumped because: kasan: bad access detected [ 48.269434] [ 48.271047] Memory state around the buggy address: [ 48.275979] ffff8880b482cc80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 48.283322] ffff8880b482cd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 48.290670] >ffff8880b482cd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb executing program executing program executing program executing program executing program executing program [ 48.298011] ^ [ 48.303444] ffff8880b482ce00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 48.310786] ffff8880b482ce80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 48.318124] ================================================================== [ 48.325468] Disabling lock debugging due to kernel taint executing program executing program executing program executing program executing program executing program executing program executing program [ 48.348705] Kernel panic - not syncing: panic_on_warn set ... [ 48.348705] [ 48.356110] CPU: 1 PID: 8354 Comm: syz-executor601 Tainted: G B 4.19.188-syzkaller #0 [ 48.365401] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.374755] Call Trace: [ 48.377356] dump_stack+0x1fc/0x2ef [ 48.381000] panic+0x26a/0x50e [ 48.384200] ? __warn_printk+0xf3/0xf3 [ 48.388216] ? preempt_schedule_common+0x45/0xc0 [ 48.392969] ? ___preempt_schedule+0x16/0x18 [ 48.397383] ? trace_hardirqs_on+0x55/0x210 [ 48.401708] kasan_end_report+0x43/0x49 [ 48.405690] kasan_report_error.cold+0xa7/0x1b9 [ 48.410379] ? vgem_gem_dumb_create+0x22c/0x240 [ 48.415049] __asan_report_load8_noabort+0x88/0x90 [ 48.419990] ? drm_gem_object_put_unlocked+0xc0/0x180 [ 48.425188] ? vgem_gem_dumb_create+0x22c/0x240 [ 48.429851] vgem_gem_dumb_create+0x22c/0x240 [ 48.434349] drm_mode_create_dumb+0x27c/0x300 [ 48.438862] drm_ioctl_kernel+0x208/0x2a0 [ 48.442995] ? drm_mode_create_dumb+0x300/0x300 [ 48.447662] ? drm_ioctl_permit+0x210/0x210 [ 48.451977] ? __might_fault+0x192/0x1d0 [ 48.456025] drm_ioctl+0x507/0x9c0 [ 48.459558] ? drm_mode_create_dumb+0x300/0x300 [ 48.464220] ? drm_getstats+0x20/0x20 [ 48.468007] ? debug_check_no_obj_freed+0x201/0x490 [ 48.473025] ? futex_exit_release+0x220/0x220 [ 48.477517] ? lock_acquire+0x170/0x3c0 [ 48.481480] ? debug_check_no_obj_freed+0xb5/0x490 [ 48.486395] ? drm_getstats+0x20/0x20 [ 48.490184] do_vfs_ioctl+0xcdb/0x12e0 [ 48.494055] ? lock_downgrade+0x720/0x720 [ 48.498208] ? check_preemption_disabled+0x41/0x280 [ 48.503212] ? ioctl_preallocate+0x200/0x200 [ 48.507633] ? __fget+0x356/0x510 [ 48.511091] ? do_dup2+0x450/0x450 [ 48.514620] ? __se_sys_futex+0x298/0x3b0 [ 48.518759] ksys_ioctl+0x9b/0xc0 [ 48.522214] __x64_sys_ioctl+0x6f/0xb0 [ 48.526104] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 48.530684] do_syscall_64+0xf9/0x620 [ 48.534545] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.539739] RIP: 0033:0x449f09 [ 48.542981] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 [ 48.561874] RSP: 002b:00007fa6a4313308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 48.569573] RAX: ffffffffffffffda RBX: 00000000004ca438 RCX: 0000000000449f09 [ 48.576846] RDX: 00000000200000c0 RSI: 00000000c02064b2 RDI: 0000000000000004 [ 48.584118] RBP: 00000000004ca430 R08: 0000000000000000 R09: 0000000000000000 [ 48.591814] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004ca43c [ 48.599080] R13: 000000000049a074 R14: 6972642f7665642f R15: 0000000000022000 [ 48.607072] Kernel Offset: disabled [ 48.610685] Rebooting in 86400 seconds..