[ 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 '10.128.1.20' (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 syzkaller login: [ 27.976972] ------------[ cut here ]------------ [ 27.981826] WARNING: CPU: 1 PID: 8453 at drivers/gpu/drm/drm_prime.c:898 drm_prime_destroy_file_private+0x3e/0x50 [ 27.992204] Kernel panic - not syncing: panic_on_warn set ... [ 27.992204] [ 27.999548] CPU: 1 PID: 8453 Comm: syz-executor167 Not tainted 4.14.277-syzkaller #0 [ 28.007402] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.016731] Call Trace: [ 28.019301] dump_stack+0x1b2/0x281 [ 28.022992] panic+0x1f9/0x42d [ 28.026163] ? add_taint.cold+0x16/0x16 [ 28.030117] ? drm_prime_destroy_file_private+0x3e/0x50 [ 28.035453] ? drm_prime_destroy_file_private+0x3e/0x50 [ 28.040791] __warn.cold+0x20/0x44 [ 28.044307] ? ist_end_non_atomic+0x10/0x10 [ 28.048605] ? drm_prime_destroy_file_private+0x3e/0x50 [ 28.053945] report_bug+0x208/0x250 [ 28.057561] do_error_trap+0x195/0x2d0 [ 28.061433] ? math_error+0x2d0/0x2d0 [ 28.065214] ? lock_downgrade+0x740/0x740 [ 28.069344] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.074170] invalid_op+0x1b/0x40 [ 28.077602] RIP: 0010:drm_prime_destroy_file_private+0x3e/0x50 [ 28.083544] RSP: 0018:ffff888097f279a0 EFLAGS: 00010297 [ 28.088881] RAX: ffff888096a6e500 RBX: ffff8880988a3db8 RCX: 1ffff11012d4ddb5 [ 28.096126] RDX: 0000000000000000 RSI: ffff888096a6ed88 RDI: ffff8880988a3e38 [ 28.103370] RBP: ffffffff837e8380 R08: 0000000000000000 R09: 0000000000000000 [ 28.110616] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880988a3b40 [ 28.117869] R13: ffff88823851cdc0 R14: ffff8880988a3cf8 R15: ffff8880988a3d20 [ 28.125127] ? vgem_gem_free_object+0xd0/0xd0 [ 28.129615] drm_release+0xaf9/0xfa0 [ 28.133311] ? ima_file_free+0x4f/0x330 [ 28.137276] ? drm_lastclose+0x2b0/0x2b0 [ 28.141315] __fput+0x25f/0x7a0 [ 28.144582] task_work_run+0x11f/0x190 [ 28.148469] do_exit+0xa44/0x2850 [ 28.151905] ? wake_up_q+0x82/0xd0 [ 28.155422] ? mm_update_next_owner+0x5b0/0x5b0 [ 28.160067] ? get_signal+0x323/0x1ca0 [ 28.163935] ? lock_acquire+0x170/0x3f0 [ 28.167886] ? lock_downgrade+0x740/0x740 [ 28.172011] do_group_exit+0x100/0x2e0 [ 28.175881] get_signal+0x38d/0x1ca0 [ 28.179575] ? do_futex+0x127/0x1570 [ 28.183267] ? drm_ioctl+0x49f/0x890 [ 28.186965] ? drm_prime_remove_buf_handle_locked+0x150/0x150 [ 28.192828] do_signal+0x7c/0x1550 [ 28.196348] ? setup_sigcontext+0x820/0x820 [ 28.200644] ? drm_getstats+0x20/0x20 [ 28.204426] ? do_vfs_ioctl+0xe2/0xff0 [ 28.208295] ? ioctl_preallocate+0x1a0/0x1a0 [ 28.212679] ? SyS_futex+0x1da/0x290 [ 28.216365] ? SyS_futex+0x1e3/0x290 [ 28.220057] ? exit_to_usermode_loop+0x41/0x200 [ 28.224701] exit_to_usermode_loop+0x160/0x200 [ 28.229259] do_syscall_64+0x4a3/0x640 [ 28.233126] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 28.238302] RIP: 0033:0x7feab69a2129 [ 28.241985] RSP: 002b:00007feab692e2f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 28.249670] RAX: fffffffffffffe00 RBX: 00007feab6a25430 RCX: 00007feab69a2129 [ 28.256918] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007feab6a25438 [ 28.264162] RBP: 00007feab6a2543c R08: 0000000000000000 R09: 0000000000000000 [ 28.271405] R10: 0000000000000000 R11: 0000000000000246 R12: 00007feab69f3074 [ 28.278647] R13: 6972642f7665642f R14: 65732f636f72702f R15: 00007feab6a25438 [ 28.286095] Kernel Offset: disabled [ 28.289740] Rebooting in 86400 seconds..