[ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ 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 '10.128.0.226' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 64.467871][ T8485] BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor255/8485 [ 64.477523][ T8485] caller is lockdep_hardirqs_on_prepare+0x5e/0x410 [ 64.484579][ T8485] CPU: 1 PID: 8485 Comm: syz-executor255 Not tainted 5.9.0-syzkaller #0 [ 64.492927][ T8485] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.503059][ T8485] Call Trace: [ 64.506350][ T8485] dump_stack+0x107/0x163 [ 64.510670][ T8485] check_preemption_disabled+0x123/0x130 [ 64.516387][ T8485] lockdep_hardirqs_on_prepare+0x5e/0x410 [ 64.522111][ T8485] trace_hardirqs_on+0x5b/0x1c0 [ 64.526971][ T8485] __bad_area_nosemaphore+0xc6/0x400 [ 64.532347][ T8485] do_user_addr_fault+0x7d7/0xb40 [ 64.537384][ T8485] exc_page_fault+0x9e/0x180 [ 64.541975][ T8485] ? asm_exc_page_fault+0x8/0x30 [ 64.547522][ T8485] asm_exc_page_fault+0x1e/0x30 [ 64.552383][ T8485] RIP: 0033:0x424240 [ 64.556266][ T8485] 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 [ 64.575864][ T8485] RSP: 002b:00007ffdd12f5b38 EFLAGS: 00010246 [ 64.582546][ T8485] RAX: 0000000000000000 RBX: 00007ffdd12f5b60 RCX: 0000000000000000 [ 64.590520][ T8485] RDX: 0000000000000010 RSI: 000000000000000f RDI: 0000000000000000 [ 64.598487][ T8485] RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 [ 64.606450][ T8485] R10: 0000000000000000 R11: 000000000000000f R12: 0000000000401dc0 [ 64.614439][ T8485] R13: 0000000000401e50 R14: 0000000000000000 R15: 0000000000000000 [ 64.622640][ T8485] BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor255/8485 [ 64.632070][ T8485] caller is lockdep_hardirqs_on+0x38/0x110 [ 64.637885][ T8485] CPU: 1 PID: 8485 Comm: syz-executor255 Not tainted 5.9.0-syzkaller #0 [ 64.646207][ T8485] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.656267][ T8485] Call Trace: [ 64.659571][ T8485] dump_stack+0x107/0x163 [ 64.663913][ T8485] check_preemption_disabled+0x123/0x130 [ 64.669560][ T8485] ? __bad_area_nosemaphore+0xc6/0x400 [ 64.675057][ T8485] lockdep_hardirqs_on+0x38/0x110 [ 64.680091][ T8485] __bad_area_nosemaphore+0xc6/0x400 [ 64.685396][ T8485] do_user_addr_fault+0x7d7/0xb40 [ 64.690446][ T8485] exc_page_fault+0x9e/0x180 [ 64.695045][ T8485] ? asm_exc_page_fault+0x8/0x30 [ 64.700017][ T8485] asm_exc_page_fault+0x1e/0x30 [ 64.704882][ T8485] RIP: 0033:0x424240 [ 64.708788][ T8485] 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 [ 64.728502][ T8485] RSP: 002b:00007ffdd12f5b38 EFLAGS: 00010246 [ 64.734572][ T8485] RAX: 0000000000000000 RBX: 00007ffdd12f5b60 RCX: 0000000000000000 [ 64.742544][ T8485] RDX: 0000000000000010 RSI: 000000000000000f RDI: 0000000000000000 [ 64.750503][ T8485] RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 [ 64.758466][ T8485] R10: 0000000000000000 R11: 000000000000000f R12: 0000000000401dc0 [ 64.766431][ T8485] R13: 0000