[ 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. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.61' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 55.104445][ T8481] list_add double add: new=ffff888017eaa080, prev=ffff88801a9cb520, next=ffff888017eaa080. [ 55.115623][ T8481] ------------[ cut here ]------------ [ 55.121246][ T8481] kernel BUG at lib/list_debug.c:29! [ 55.126703][ T8481] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 55.134150][ T8481] CPU: 0 PID: 8481 Comm: syz-executor556 Not tainted 5.11.0-rc5-syzkaller #0 [ 55.143416][ T8481] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.154701][ T8481] RIP: 0010:__list_add_valid.cold+0x26/0x3c [ 55.160618][ T8481] Code: 04 c3 fb fa 4c 89 e1 48 c7 c7 e0 de 9e 89 e8 9e 43 f3 ff 0f 0b 48 89 f2 4c 89 e1 48 89 ee 48 c7 c7 20 e0 9e 89 e8 87 43 f3 ff <0f> 0b 48 89 f1 48 c7 c7 a0 df 9e 89 4c 89 e6 e8 73 43 f3 ff 0f 0b [ 55.180305][ T8481] RSP: 0018:ffffc90000fef938 EFLAGS: 00010086 [ 55.186388][ T8481] RAX: 0000000000000058 RBX: ffff888017eaa000 RCX: 0000000000000000 [ 55.194358][ T8481] RDX: ffff88801f3ed340 RSI: ffffffff815b6285 RDI: fffff520001fdf19 [ 55.202595][ T8481] RBP: ffff888017eaa080 R08: 0000000000000058 R09: 0000000000000000 [ 55.210571][ T8481] R10: ffffffff815af45e R11: 0000000000000000 R12: ffff888017eaa080 [ 55.218804][ T8481] R13: ffff888014901900 R14: ffff88801a9cb000 R15: ffff88801a9cb520 [ 55.226780][ T8481] FS: 0000000002395880(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 [ 55.235709][ T8481] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 55.242296][ T8481] CR2: 00007ff04f95b6c0 CR3: 000000001a4f2000 CR4: 0000000000350ef0 [ 55.250278][ T8481] Call Trace: [ 55.254417][ T8481] io_file_get+0x8cc/0xdb0 [ 55.258828][ T8481] __io_splice_prep+0x1bc/0x530 [ 55.264635][ T8481] io_req_prep+0x3546/0x4e80 [ 55.270254][ T8481] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 55.276959][ T8481] ? __io_splice_prep+0x530/0x530 [ 55.281989][ T8481] ? mark_lock+0xf7/0x1720 [ 55.286400][ T8481] io_queue_sqe+0x609/0x10d0 [ 55.290993][ T8481] io_submit_sqes+0x1495/0x2720 [ 55.295828][ T8481] ? io_queue_sqe+0x10d0/0x10d0 [ 55.300671][ T8481] ? __do_sys_io_uring_enter+0x1071/0x1f30 [ 55.306478][ T8481] ? mutex_lock_io_nested+0xf60/0xf60 [ 55.311848][ T8481] ? find_held_lock+0x2d/0x110 [ 55.316596][ T8481] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 55.322987][ T8481] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 55.329227][ T8481] __do_sys_io_uring_enter+0x107d/0x1f30 [ 55.334910][ T8481] ? io_sq_thread+0x1890/0x1890 [ 55.339804][ T8481] ? lapic_next_event+0x4d/0x80 [ 55.345022][ T8481] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 55.351265][ T8481] ? clockevents_program_event+0x12b/0x370 [ 55.357152][ T8481] ? tick_program_event+0xb4/0x140 [ 55.362243][ T8481] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 55.368460][ T8481] ? hrtimer_interrupt+0x6f4/0x940 [ 55.373546][ T8481] ? kvm_sched_clock_read+0x14/0x40 [ 55.378722][ T8481] ? sched_clock+0x2a/0x40 [ 55.383204][ T8481] ? syscall_enter_from_user_mode+0x1d/0x50 [ 55.389105][ T8481] do_syscall_64+0x2d/0x70 [ 55.393509][ T8481] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.399514][ T8481] RIP: 0033:0x440569 [ 55.403502][ T8481] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 55.423099][ T8481] RSP: 002b:00007ffe38c5c5a8 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa [ 55.431503][ T8481] RAX: ffffffffffffffda RBX: 0000000000401e00 RCX: 0000000000440569 [ 55.439487][ T8481] RDX: 0000000000000000 RSI: 000000000000450c RDI: 0000000000000004 [ 55.447448][ T8481] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 55.455413][ T8481] R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000401d70 [ 55.463374][ T8481] R13: 0000000000401e00 R14: 0000000000000000 R15: 0000000000000000 [ 55.471340][ T8481] Modules linked in: [ 55.475219][ T8481] ---[ end trace 3c68392a0f24e7a0 ]--- [ 55.480646][ T8481] RIP: 0010:__list_add_valid.cold+0x26/0x3c [ 55.486524][ T8481] Code: 04 c3 fb fa 4c 89 e1 48 c7 c7 e0 de 9e 89 e8 9e 43 f3 ff 0f 0b 48 89 f2 4c 89 e1 48 89 ee 48 c7 c7 20 e0 9e 89 e8 87 43 f3 ff <0f> 0b 48 89 f1 48 c7 c7 a0 df 9e 89 4c 89 e6 e8 73 43 f3 ff 0f 0b [ 55.506113][ T8481] RSP: 0018:ffffc90000fef938 EFLAGS: 00010086 [ 55.512160][ T8481] RAX: 0000000000000058 RBX: ffff888017eaa000 RCX: 0000000000000000 [ 55.520105][ T8481] RDX: ffff88801f3ed340 RSI: ffffffff815b6285 RDI: fffff520001fdf19 [ 55.528055][ T8481] RBP: ffff888017eaa080 R08: 0000000000000058 R09: 0000000000000000 [ 55.536001][ T8481] R10: ffffffff815af45e R11: 0000000000000000 R12: ffff888017eaa080 [ 55.543954][ T8481] R13: ffff888014901900 R14: ffff88801a9cb000 R15: ffff88801a9cb520 [ 55.551909][ T8481] FS: 0000000002395880(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 [ 55.560821][ T8481] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 55.567383][ T8481] CR2: 00007ff04f95b6c0 CR3: 000000001a4f2000 CR4: 0000000000350ef0 [ 55.575347][ T8481] Kernel panic - not syncing: Fatal exception [ 55.585408][ T8481] Kernel Offset: disabled [ 55.589722][ T8481] Rebooting in 86400 seconds..