[ 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 '10.128.0.119' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 41.584191][ C1] traps: PANIC: double fault, error_code: 0x0 [ 41.584194][ C1] double fault: 0000 [#1] PREEMPT SMP KASAN [ 41.584196][ C1] CPU: 1 PID: 6795 Comm: syz-executor326 Not tainted 5.8.0-rc2-syzkaller #0 [ 41.584198][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.584200][ C1] RIP: 0010:check_preemption_disabled+0xa/0x240 [ 41.584204][ C1] Code: e8 ab a0 57 f9 48 c7 c7 7e a1 e9 88 48 c7 c6 7f 26 04 89 eb 0b 90 66 2e 0f 1f 84 00 00 00 00 00 55 41 57 41 56 41 55 41 54 53 <50> 49 89 f6 49 89 ff e8 7a a0 57 f9 65 8b 1d 2b e0 e4 77 65 8b 2d [ 41.584205][ C1] RSP: 0018:fffffe0000037000 EFLAGS: 00010093 [ 41.584208][ C1] RAX: ffffffff881cb549 RBX: 0000000000000000 RCX: ffff888092e9c000 [ 41.584210][ C1] RDX: 0000000000000000 RSI: ffffffff8904a14f RDI: ffffffff88f45327 [ 41.584212][ C1] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 41.584214][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 41.584216][ C1] R13: dffffc0000000000 R14: 0000000000000000 R15: fffffe0000037120 [ 41.584218][ C1] FS: 00007fa84e2fd700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 41.584219][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.584221][ C1] CR2: fffffe0000036ff8 CR3: 000000009ee0b000 CR4: 00000000001406e0 [ 41.584223][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 41.584225][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 41.584226][ C1] Call Trace: [ 41.584227][ C1] [ 41.584228][ C1] fixup_bad_iret+0x3a/0xf0 [ 41.584229][ C1] error_entry+0xb8/0xc0 [ 41.584230][ C1] RIP: 0010:native_irq_return_iret+0x0/0x2 [ 41.584235][ C1] Code: 5a 41 59 41 58 58 59 5a 5e 5f 48 83 c4 08 e9 10 00 00 00 90 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 f6 44 24 20 04 75 02 <48> cf 57 0f 01 f8 0f 1f 00 65 48 8b 3c 25 08 90 01 00 48 89 07 48 [ 41.584236][ C1] RSP: 0018:fffffe00000371d8 EFLAGS: 00010046 ORIG_RAX: 0000000000000000 [ 41.584239][ C1] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 41.584241][ C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000100 [ 41.584243][ C1] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 41.584245][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 41.584247][ C1] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 41.584248][ C1] ? asm_exc_general_protection+0x8/0x30 [ 41.584249][ C1] RIP: 0033:0x273c050000075366 [ 41.584250][ C1] Code: Bad RIP value. [ 41.584252][ C1] RSP: 002b:00007fa84e2fcd98 EFLAGS: 00000346 [ 41.584253][ C1] Modules linked in: [ 41.841083][ C1] ---[ end trace 5788168864dea9dd ]--- [ 41.841085][ C1] RIP: 0010:check_preemption_disabled+0xa/0x240 [ 41.841089][ C1] Code: e8 ab a0 57 f9 48 c7 c7 7e a1 e9 88 48 c7 c6 7f 26 04 89 eb 0b 90 66 2e 0f 1f 84 00 00 00 00 00 55 41 57 41 56 41 55 41 54 53 <50> 49 89 f6 49 89 ff e8 7a a0 57 f9 65 8b 1d 2b e0 e4 77 65 8b 2d [ 41.841090][ C1] RSP: 0018:fffffe0000037000 EFLAGS: 00010093 [ 41.841093][ C1] RAX: ffffffff881cb549 RBX: 0000000000000000 RCX: ffff888092e9c000 [ 41.841095][ C1] RDX: 0000000000000000 RSI: ffffffff8904a14f RDI: ffffffff88f45327 [ 41.841097][ C1] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 41.841098][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 41.841100][ C1] R13: dffffc0000000000 R14: 0000000000000000 R15: fffffe0000037120 [ 41.841102][ C1] FS: 00007fa84e2fd700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 41.841103][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.841105][ C1] CR2: fffffe0000036ff8 CR3: 000000009ee0b000 CR4: 00000000001406e0 [ 41.841107][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 41.841109][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 41.841110][ C1] Kernel panic - not syncing: Fatal exception in interrupt [ 41.842383][ C1] Kernel Offset: disabled