[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 57.457538][ T26] audit: type=1800 audit(1573042643.485:25): pid=8687 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 57.492494][ T26] audit: type=1800 audit(1573042643.485:26): pid=8687 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 57.528826][ T26] audit: type=1800 audit(1573042643.485:27): pid=8687 uid=0 auid=4294967295 ses=4294967295 subj==unconfined 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 '10.128.1.60' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 69.433352][ T8842] ------------[ cut here ]------------ [ 69.438988][ T8842] WARNING: CPU: 0 PID: 8842 at include/linux/thread_info.h:150 drm_mode_createblob_ioctl+0x398/0x490 [ 69.449821][ T8842] Kernel panic - not syncing: panic_on_warn set ... [ 69.456403][ T8842] CPU: 0 PID: 8842 Comm: syz-executor938 Not tainted 5.4.0-rc6-next-20191105 #0 [ 69.465394][ T8842] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.475439][ T8842] Call Trace: [ 69.478715][ T8842] dump_stack+0x197/0x210 [ 69.483025][ T8842] ? drm_mode_createblob_ioctl+0x2f0/0x490 [ 69.489076][ T8842] panic+0x2e3/0x75c [ 69.492949][ T8842] ? add_taint.cold+0x16/0x16 [ 69.497603][ T8842] ? printk+0xba/0xed [ 69.501561][ T8842] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 69.506995][ T8842] ? __warn.cold+0x14/0x35 [ 69.511382][ T8842] ? __warn+0xd9/0x1d0 [ 69.515535][ T8842] ? drm_mode_createblob_ioctl+0x398/0x490 [ 69.521323][ T8842] __warn.cold+0x2f/0x35 [ 69.525545][ T8842] ? report_bug.cold+0x63/0xb2 [ 69.530285][ T8842] ? drm_mode_createblob_ioctl+0x398/0x490 [ 69.536068][ T8842] report_bug+0x289/0x300 [ 69.540376][ T8842] do_error_trap+0x11b/0x200 [ 69.544943][ T8842] do_invalid_op+0x37/0x50 [ 69.549336][ T8842] ? drm_mode_createblob_ioctl+0x398/0x490 [ 69.555377][ T8842] invalid_op+0x23/0x30 [ 69.559508][ T8842] RIP: 0010:drm_mode_createblob_ioctl+0x398/0x490 [ 69.565911][ T8842] Code: c1 ea 03 80 3c 02 00 0f 85 ed 00 00 00 49 89 5d 00 e8 0c f2 c6 fd 4c 89 f7 e8 24 af aa 03 31 c0 e9 75 fd ff ff e8 f8 f1 c6 fd <0f> 0b e8 f1 f1 c6 fd 4d 85 e4 b8 f2 ff ff ff 0f 84 5b fd ff ff 89 [ 69.585495][ T8842] RSP: 0018:ffff8880a5e07aa8 EFLAGS: 00010293 [ 69.591558][ T8842] RAX: ffff88809f3a0440 RBX: ffff8880a387c000 RCX: ffffffff83ac75e2 [ 69.599507][ T8842] RDX: 0000000000000000 RSI: ffffffff83ac77a8 RDI: 0000000000000007 [ 69.607455][ T8842] RBP: ffff8880a5e07ae8 R08: ffff88809f3a0440 R09: ffffed101470f910 [ 69.615414][ T8842] R10: ffffed101470f90f R11: ffff8880a387c87f R12: ffffc90005f5d000 [ 69.623364][ T8842] R13: ffff8880a4d78000 R14: 0000000096e170d0 R15: ffffc90005f5d058 [ 69.631422][ T8842] ? drm_mode_createblob_ioctl+0x1d2/0x490 [ 69.637218][ T8842] ? drm_mode_createblob_ioctl+0x398/0x490 [ 69.643013][ T8842] ? drm_mode_createblob_ioctl+0x398/0x490 [ 69.648819][ T8842] drm_ioctl_kernel+0x244/0x300 [ 69.653657][ T8842] ? drm_mode_getblob_ioctl+0x310/0x310 [ 69.659197][ T8842] ? drm_setversion+0x8c0/0x8c0 [ 69.664047][ T8842] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 69.670264][ T8842] ? _copy_from_user+0x12c/0x1a0 [ 69.675183][ T8842] drm_ioctl+0x54e/0xa60 [ 69.679403][ T8842] ? drm_mode_getblob_ioctl+0x310/0x310 [ 69.684928][ T8842] ? drm_ioctl_kernel+0x300/0x300 [ 69.689927][ T8842] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 69.695726][ T8842] ? drm_ioctl_kernel+0x300/0x300 [ 69.700735][ T8842] do_vfs_ioctl+0x977/0x14e0 [ 69.705306][ T8842] ? compat_ioctl_preallocate+0x220/0x220 [ 69.711004][ T8842] ? __fget+0x37f/0x550 [ 69.715153][ T8842] ? ksys_dup3+0x3e0/0x3e0 [ 69.719557][ T8842] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 69.725082][ T8842] ? tomoyo_file_ioctl+0x23/0x30 [ 69.730005][ T8842] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 69.736348][ T8842] ? security_file_ioctl+0x8d/0xc0 [ 69.741460][ T8842] ksys_ioctl+0xab/0xd0 [ 69.745607][ T8842] __x64_sys_ioctl+0x73/0xb0 [ 69.750200][ T8842] do_syscall_64+0xfa/0x760 [ 69.754689][ T8842] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 69.760564][ T8842] RIP: 0033:0x449659 [ 69.764439][ T8842] Code: e8 fc b8 02 00 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 ab d6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 69.784290][ T8842] RSP: 002b:00007f6951f91db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 69.792711][ T8842] RAX: ffffffffffffffda RBX: 00000000006dac38 RCX: 0000000000449659 [ 69.800669][ T8842] RDX: 0000000020000000 RSI: ffffffffffffffbd RDI: 0000000000000004 [ 69.808620][ T8842] RBP: 00000000006dac30 R08: 00007f6951f92700 R09: 0000000000000000 [ 69.816569][ T8842] R10: 00007f6951f92700 R11: 0000000000000246 R12: 00000000006dac3c [ 69.824532][ T8842] R13: 00007ffeae0e7e9f R14: 00007f6951f929c0 R15: 20c49ba5e353f7cf [ 69.834489][ T8842] Kernel Offset: disabled [ 69.838886][ T8842] Rebooting in 86400 seconds..