[ 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... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.243' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 64.432031][ T8482] BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor046/8482 [ 64.441461][ T8482] caller is lockdep_hardirqs_on_prepare+0x5e/0x410 [ 64.448973][ T8482] CPU: 1 PID: 8482 Comm: syz-executor046 Not tainted 5.9.0-syzkaller #0 [ 64.457331][ T8482] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.467383][ T8482] Call Trace: [ 64.470676][ T8482] dump_stack+0x107/0x163 [ 64.474996][ T8482] check_preemption_disabled+0x123/0x130 [ 64.480634][ T8482] lockdep_hardirqs_on_prepare+0x5e/0x410 [ 64.486340][ T8482] trace_hardirqs_on+0x5b/0x1c0 [ 64.491191][ T8482] __bad_area_nosemaphore+0xc6/0x400 [ 64.497611][ T8482] do_user_addr_fault+0x7d7/0xb40 [ 64.502633][ T8482] exc_page_fault+0x9e/0x180 [ 64.507231][ T8482] ? asm_exc_page_fault+0x8/0x30 [ 64.512166][ T8482] asm_exc_page_fault+0x1e/0x30 [ 64.517005][ T8482] RIP: 0033:0x424270 [ 64.520902][ T8482] 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 [ 64.540516][ T8482] RSP: 002b:00007ffd36cc16f8 EFLAGS: 00010246 [ 64.546590][ T8482] RAX: 0000000000000000 RBX: 00007ffd36cc1720 RCX: 0000000000000000 [ 64.554553][ T8482] RDX: 0000000000000010 RSI: 000000000000000f RDI: 0000000000000000 [ 64.562514][ T8482] RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 [ 64.570478][ T8482] R10: 0000000000000000 R11: 000000000000000f R12: 0000000000401df0 [ 64.578457][ T8482] R13: 0000000000401e80 R14: 0000000000000000 R15: 0000000000000000 [ 64.586639][ T8482] BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor046/8482 [ 64.596076][ T8482] caller is lockdep_hardirqs_on+0x38/0x110 [ 64.601957][ T8482] CPU: 1 PID: 8482 Comm: syz-executor046 Not tainted 5.9.0-syzkaller #0 [ 64.610293][ T8482] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.620348][ T8482] Call Trace: [ 64.623639][ T8482] dump_stack+0x107/0x163 [ 64.627961][ T8482] check_preemption_disabled+0x123/0x130 [ 64.633762][ T8482] ? __bad_area_nosemaphore+0xc6/0x400 [ 64.639232][ T8482] lockdep_hardirqs_on+0x38/0x110 [ 64.644253][ T8482] __bad_area_nosemaphore+0xc6/0x400 [ 64.649532][ T8482] do_user_addr_fault+0x7d7/0xb40 [ 64.654558][ T8482] exc_page_fault+0x9e/0x180 [ 64.659157][ T8482] ? asm_exc_page_fault+0x8/0x30 [ 64.664085][ T8482] asm_exc_page_fault+0x1e/0x30 [ 64.668932][ T8482] RIP: 0033:0x424270 [ 64.672830][ T8482] 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 [ 64.692448][ T8482] RSP: 002b:00007ffd36cc16f8 EFLAGS: 00010246 [ 64.698509][ T8482] RAX: 0000000000000000 RBX: 00007ffd36cc1720 RCX: 0000000000000000 [ 64.706469][ T8482] RDX: 0000000000000010 RSI: 000000000000000f RDI: 0000000000000000 [ 64.714442][ T8482] RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 [ 64.722428][ T8482] R10: 0000000000000000 R11: 000000000000000f R12: 0000000000401df0 [ 64.730388][ T8482] R13: 000000