Starting Permit User Sessions... [ OK ] Started Daily apt download activities. Starting getty on tty2-tty6 if dbus and logind are not available... Starting OpenBSD Secure Shell server... [ OK ] Started Daily apt upgrade and clean activities. [ OK ] Reached target Timers. [ OK ] Started System Logging Service. [ OK ] Started Permit User Sessions. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ 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 '10.128.15.209' (ECDSA) to the list of known hosts. syzkaller login: [ 55.913670][ T5] divide_error: 0000 [#1] PREEMPT SMP KASAN [ 55.913702][ T5] CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.8.0-rc6-next-20200721-syzkaller #0 [ 55.913710][ T5] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.913726][ T5] Workqueue: events console_callback [ 55.913744][ T5] RIP: 0010:fbcon_switch+0x1fe/0x16c0 [ 55.913756][ T5] Code: 2d 57 27 8d 09 48 89 2d d0 26 8d 09 38 ca 7c 08 84 c9 0f 85 7e 13 00 00 41 8b 9c 24 b4 03 00 00 44 89 f0 31 d2 bf 05 00 00 00 f3 41 89 c6 89 c6 e8 26 61 b1 fd 41 83 fe 05 0f 8e c4 09 00 00 [ 55.913762][ T5] RSP: 0018:ffffc90000cbf9a0 EFLAGS: 00010246 [ 55.913773][ T5] RAX: 0000000000008000 RBX: 0000000000000000 RCX: 0000000000000000 [ 55.913780][ T5] RDX: 0000000000000000 RSI: ffffffff83c2db3d RDI: 0000000000000005 [ 55.913788][ T5] RBP: ffff8880a30c0000 R08: 0000000000000000 R09: ffffffff8ab8e247 [ 55.913795][ T5] R10: 0000000000000000 R11: 0000000000063688 R12: ffff88809f129000 [ 55.913803][ T5] R13: ffff8880a47e5000 R14: 0000000000008000 R15: ffffffff889943e0 [ 55.913812][ T5] FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 55.913820][ T5] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 55.913827][ T5] CR2: 00000000004553d0 CR3: 000000009cd20000 CR4: 00000000001506f0 [ 55.913838][ T5] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 55.913845][ T5] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 55.913861][ T5] Call Trace: [ 55.913876][ T5] ? fbcon_init+0x1b00/0x1b00 [ 55.913889][ T5] ? mark_lock+0xbc/0x1710 [ 55.913903][ T5] ? mark_held_locks+0x9f/0xe0 [ 55.913923][ T5] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 55.913936][ T5] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 55.913948][ T5] ? trace_hardirqs_on+0x5f/0x220 [ 55.913964][ T5] ? lockdep_hardirqs_on+0x76/0xf0 [ 55.913977][ T5] ? _raw_spin_unlock_irqrestore+0x9b/0xe0 [ 55.913999][ T5] ? is_console_locked+0x5/0x10 [ 55.914010][ T5] ? fbcon_set_origin+0x26/0x50 [ 55.914025][ T5] redraw_screen+0x2af/0x770 [ 55.914038][ T5] ? lock_acquire+0x151/0xad0 [ 55.914052][ T5] ? vc_init+0x430/0x430 [ 55.914066][ T5] ? fb_get_color_depth+0x11a/0x240 [ 55.914081][ T5] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 55.914099][ T5] complete_change_console+0xff/0x610 [ 55.914110][ T5] ? fbcon_cursor+0x537/0x660 [ 55.914124][ T5] change_console+0x19c/0x560 [ 55.914138][ T5] console_callback+0x3b1/0x410 [ 55.914151][ T5] ? poke_blanked_console+0x270/0x270 [ 55.914162][ T5] ? _raw_spin_unlock_irq+0x1f/0x80 [ 55.914173][ T5] ? lock_is_held_type+0xbb/0xf0 [ 55.914193][ T5] process_one_work+0x94c/0x1670 [ 55.914212][ T5] ? lock_release+0x8e0/0x8e0 [ 55.914224][ T5] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 55.914240][ T5] ? rwlock_bug.part.0+0x90/0x90 [ 55.914252][ T5] ? lockdep_hardirqs_off+0x6a/0xb0 [ 55.914268][ T5] worker_thread+0x64c/0x1120 [ 55.914291][ T5] ? process_one_work+0x1670/0x1670 [ 55.914305][ T5] kthread+0x3b5/0x4a0 [ 55.914339][ T5] ? __kthread_bind_mask+0xc0/0xc0 [ 55.914350][ T5] ? __kthread_bind_mask+0xc0/0xc0 [ 55.914364][ T5] ret_from_fork+0x1f/0x30 [ 55.914378][ T5] Modules linked in: [ 55.914395][ T5] ---[ end trace a0134869282f299c ]--- [ 55.914410][ T5] RIP: 0010:fbcon_switch+0x1fe/0x16c0 [ 55.914425][ T5] Code: 2d 57 27 8d 09 48 89 2d d0 26 8d 09 38 ca 7c 08 84 c9 0f 85 7e 13 00 00 41 8b 9c 24 b4 03 00 00 44 89 f0 31 d2 bf 05 00 00 00 f3 41 89 c6 89 c6 e8 26 61 b1 fd 41 83 fe 05 0f 8e c4 09 00 00 [ 55.914434][ T5] RSP: 0018:ffffc90000cbf9a0 EFLAGS: 00010246 [ 55.914447][ T5] RAX: 0000000000008000 RBX: 0000000000000000 RCX: 0000000000000000 [ 55.914454][ T5] RDX: 0000000000000000 RSI: ffffffff83c2db3d RDI: 0000000000000005 [ 55.914462][ T5] RBP: ffff8880a30c0000 R08: 0000000000000000 R09: ffffffff8ab8e247 [ 55.914472][ T5] R10: 0000000000000000 R11: 0000000000063688 R12: ffff88809f129000 [ 55.914480][ T5] R13: ffff8880a47e5000 R14: 0000000000008000 R15: ffffffff889943e0 [ 55.914492][ T5] FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 55.914505][ T5] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 55.914513][ T5] CR2: 00000000004553d0 CR3: 000000009cd20000 CR4: 00000000001506f0 [ 55.914525][ T5] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 55.914532][ T5] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 55.914538][ T5] Kernel panic - not syncing: Fatal exception [ 55.915765][ T5] Kernel Offset: disabled [ 56.353462][ T5] Rebooting in 86400 seconds..