[ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.12' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 100.319355][ T6785] general protection fault, probably for non-canonical address 0xdffffc0020000001: 0000 [#1] PREEMPT SMP KASAN [ 100.319364][ T6785] KASAN: probably user-memory-access in range [0x0000000100000008-0x000000010000000f] [ 100.319375][ T6785] CPU: 0 PID: 6785 Comm: syz-executor943 Not tainted 5.7.0-syzkaller #0 [ 100.319381][ T6785] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 100.319399][ T6785] RIP: 0010:do_con_write.part.0+0x9a3/0x1dc0 [ 100.319409][ T6785] Code: 24 ae 00 00 00 45 01 ef e8 da 97 85 fd 48 8b 44 24 60 80 38 00 0f 85 af 11 00 00 49 8b 9c 24 f0 03 00 00 48 89 d8 48 c1 e8 03 <0f> b6 14 28 48 89 d8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 e6 [ 100.319415][ T6785] RSP: 0018:ffffc90001b078e8 EFLAGS: 00010203 [ 100.319425][ T6785] RAX: 0000000020000001 RBX: 000000010000000e RCX: ffffffff83ee3696 [ 100.319431][ T6785] RDX: 0000000000000000 RSI: ffffffff83ee36e6 RDI: 0000000000000003 [ 100.319438][ T6785] RBP: dffffc0000000000 R08: ffff8880953be280 R09: fffffbfff1516d79 [ 100.319444][ T6785] R10: ffffffff8a8b6bc7 R11: fffffbfff1516d78 R12: ffff888097813000 [ 100.319451][ T6785] R13: 0000000000000000 R14: ffff8880978133dc R15: 000000000000075e [ 100.319460][ T6785] FS: 0000000001826880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 100.319467][ T6785] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 100.319474][ T6785] CR2: 00005569bb19b160 CR3: 00000000a1331000 CR4: 00000000001406f0 [ 100.319484][ T6785] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 100.319490][ T6785] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 100.319494][ T6785] Call Trace: [ 100.319517][ T6785] ? do_con_trol+0x5d80/0x5d80 [ 100.319535][ T6785] con_put_char+0xf0/0x100 [ 100.319548][ T6785] ? do_con_write.part.0+0x1dc0/0x1dc0 [ 100.319561][ T6785] ? n_tty_receive_buf_common+0xc26/0x2b10 [ 100.319574][ T6785] ? mark_held_locks+0x9f/0xe0 [ 100.319589][ T6785] ? do_con_write.part.0+0x1dc0/0x1dc0 [ 100.319603][ T6785] tty_put_char+0xb7/0x150 [ 100.319614][ T6785] ? tty_hung_up_p+0x70/0x70 [ 100.319685][ T6785] ? n_tty_receive_signal_char+0xc5/0x110 [ 100.319696][ T6785] ? con_write_room+0x59/0x70 [ 100.319709][ T6785] __process_echoes+0x56d/0xa00 [ 100.319724][ T6785] n_tty_receive_buf_common+0xc65/0x2b10 [ 100.319744][ T6785] ? n_tty_receive_buf2+0x40/0x40 [ 100.319755][ T6785] tty_ioctl+0x905/0x1440 [ 100.319767][ T6785] ? tty_vhangup+0x30/0x30 [ 100.319782][ T6785] ? do_vfs_ioctl+0x430/0x1360 [ 100.319795][ T6785] ? ioctl_file_clone+0x180/0x180 [ 100.319809][ T6785] ? debug_smp_processor_id+0x2f/0x185 [ 100.319824][ T6785] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 100.319835][ T6785] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 100.319849][ T6785] ? tty_vhangup+0x30/0x30 [ 100.319860][ T6785] ksys_ioctl+0x11a/0x180 [ 100.319873][ T6785] __x64_sys_ioctl+0x6f/0xb0 [ 100.319891][ T6785] do_syscall_64+0xf6/0x7d0 [ 100.319904][ T6785] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 100.319910][ T6785] RIP: 0033:0x441579 [ 100.319917][ T6785] Code: e8 ac 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 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 100.319920][ T6785] RSP: 002b:00007fff99d2b538 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 100.319928][ T6785] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441579 [ 100.319933][ T6785] RDX: 00000000200000c0 RSI: 0000000000005412 RDI: 0000000000000004 [ 100.319937][ T6785] RBP: 00000000006cc018 R08: 000000000000000e R09: 00000000004002c8 [ 100.319941][ T6785] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004022f0 [ 100.319945][ T6785] R13: 0000000000402380 R14: 0000000000000000 R15: 0000000000000000 [ 100.319951][ T6785] Modules linked in: [ 100.319990][ T6785] ---[ end trace 3f102542a5f4a985 ]--- [ 100.320003][ T6785] RIP: 0010:do_con_write.part.0+0x9a3/0x1dc0 [ 100.320013][ T6785] Code: 24 ae 00 00 00 45 01 ef e8 da 97 85 fd 48 8b 44 24 60 80 38 00 0f 85 af 11 00 00 49 8b 9c 24 f0 03 00 00 48 89 d8 48 c1 e8 03 <0f> b6 14 28 48 89 d8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 e6 [ 100.320019][ T6785] RSP: 0018:ffffc90001b078e8 EFLAGS: 00010203 [ 100.320028][ T6785] RAX: 0000000020000001 RBX: 000000010000000e RCX: ffffffff83ee3696 [ 100.320034][ T6785] RDX: 0000000000000000 RSI: ffffffff83ee36e6 RDI: 0000000000000003 [ 100.320041][ T6785] RBP: dffffc0000000000 R08: ffff8880953be280 R09: fffffbfff1516d79 [ 100.320047][ T6785] R10: ffffffff8a8b6bc7 R11: fffffbfff1516d78 R12: ffff888097813000 [ 100.320051][ T6785] R13: 0000000000000000 R14: ffff8880978133dc R15: 000000000000075e [ 100.320057][ T6785] FS: 0000000001826880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 100.320062][ T6785] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 100.320066][ T6785] CR2: 00005569bb19b160 CR3: 00000000a1331000 CR4: 00000000001406f0 [ 100.320073][ T6785] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 100.320077][ T6785] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 100.320081][ T6785] Kernel panic - not syncing: Fatal exception [ 100.321512][ T6785] Kernel Offset: disabled