[  OK  ] Started Getty on tty2.
[  OK  ] Started Getty on tty1.
[  OK  ] Started Serial Getty on ttyS0.
[  OK  ] Reached target Login Prompts.
[  OK  ] Started OpenBSD Secure Shell server.

Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.10.18' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   66.978237][ T8526] BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor175/8526
[   66.987689][ T8526] caller is lockdep_hardirqs_on_prepare+0x5e/0x410
[   66.994189][ T8526] CPU: 0 PID: 8526 Comm: syz-executor175 Not tainted 5.9.0-syzkaller #0
[   67.002508][ T8526] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   67.012553][ T8526] Call Trace:
[   67.015837][ T8526]  dump_stack+0x107/0x163
[   67.020158][ T8526]  check_preemption_disabled+0x123/0x130
[   67.025781][ T8526]  lockdep_hardirqs_on_prepare+0x5e/0x410
[   67.031485][ T8526]  trace_hardirqs_on+0x5b/0x1c0
[   67.036339][ T8526]  __bad_area_nosemaphore+0xc6/0x400
[   67.041649][ T8526]  do_user_addr_fault+0x7d7/0xb40
[   67.046664][ T8526]  exc_page_fault+0x9e/0x180
[   67.051235][ T8526]  ? asm_exc_page_fault+0x8/0x30
[   67.056202][ T8526]  asm_exc_page_fault+0x1e/0x30
[   67.061058][ T8526] RIP: 0033:0x4242d0
[   67.065643][ T8526] Code: 66 0f ef c0 66 0f ef c9 66 0f ef d2 66 0f ef db 48 89 f8 48 89 f9 48 81 e1 ff 0f 00 00 48 81 f9 cf 0f 00 00 77 74 48 83 e0 f0 <66> 0f 74 00 66 0f 74 48 10 66 0f 74 50 20 66 0f 74 58 30 66 0f d7
[   67.085332][ T8526] RSP: 002b:00007ffd8fea6e68 EFLAGS: 00010246
[   67.091386][ T8526] RAX: 0000000000000000 RBX: 00007ffd8fea6e90 RCX: 0000000000000000
[   67.099355][ T8526] RDX: 0000000000000010 RSI: 000000000000000f RDI: 0000000000000000
[   67.107329][ T8526] RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000
[   67.115727][ T8526] R10: 0000000000000000 R11: 000000000000000f R12: 0000000000401e50
[   67.123688][ T8526] R13: 0000000000401ee0 R14: 0000000000000000 R15: 0000000000000000
[   67.132682][ T8526] BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor175/8526
[   67.143095][ T8526] caller is lockdep_hardirqs_on+0x38/0x110
[   67.149012][ T8526] CPU: 0 PID: 8526 Comm: syz-executor175 Not tainted 5.9.0-syzkaller #0
[   67.157339][ T8526] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   67.167398][ T8526] Call Trace:
[   67.170677][ T8526]  dump_stack+0x107/0x163
[   67.175002][ T8526]  check_preemption_disabled+0x123/0x130
[   67.180617][ T8526]  ? __bad_area_nosemaphore+0xc6/0x400
[   67.186060][ T8526]  lockdep_hardirqs_on+0x38/0x110
[   67.191079][ T8526]  __bad_area_nosemaphore+0xc6/0x400
[   67.196376][ T8526]  do_user_addr_fault+0x7d7/0xb40
[   67.201402][ T8526]  exc_page_fault+0x9e/0x180
[   67.205974][ T8526]  ? asm_exc_page_fault+0x8/0x30
[   67.210891][ T8526]  asm_exc_page_fault+0x1e/0x30
[   67.215721][ T8526] RIP: 0033:0x4242d0
[   67.219609][ T8526] Code: 66 0f ef c0 66 0f ef c9 66 0f ef d2 66 0f ef db 48 89 f8 48 89 f9 48 81 e1 ff 0f 00 00 48 81 f9 cf 0f 00 00 77 74 48 83 e0 f0 <66> 0f 74 00 66 0f 74 48 10 66 0f 74 50 20 66 0f 74 58 30 66 0f d7
[   67.239212][ T8526] RSP: 002b:00007ffd8fea6e68 EFLAGS: 00010246
[   67.245276][ T8526] RAX: 0000000000000000 RBX: 00007ffd8fea6e90 RCX: 0000000000000000
[   67.253230][ T8526] RDX: 0000000000000010 RSI: 000000000000000f RDI: 0000000000000000
[   67.261205][ T8526] RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000
[   67.269168][ T8526] R10: 0000000000000000 R11: 000000000000000f R12: 0000000000401e50
[   67.277120][ T8526] R13: