[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ 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 '10.128.0.140' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 71.397810][ T6548] general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN [ 71.409564][ T6548] KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] [ 71.418479][ T6548] CPU: 0 PID: 6548 Comm: syz-executor433 Not tainted 5.14.0-next-20210830-syzkaller #0 [ 71.428114][ T6548] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 71.438177][ T6548] RIP: 0010:sock_from_file+0x20/0x90 [ 71.443480][ T6548] Code: f5 ff ff ff c3 0f 1f 44 00 00 41 54 53 48 89 fb e8 85 e9 62 fa 48 8d 7b 28 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 4f 45 31 e4 48 81 7b 28 80 f1 8a 8a 74 0c e8 58 e9 [ 71.463074][ T6548] RSP: 0018:ffffc90002caf8e8 EFLAGS: 00010206 [ 71.469226][ T6548] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 71.477294][ T6548] RDX: 0000000000000005 RSI: ffffffff8713203b RDI: 0000000000000028 [ 71.485340][ T6548] RBP: ffff888019fc0780 R08: ffffffff899aee40 R09: ffffffff81e21978 [ 71.493300][ T6548] R10: 0000000000000027 R11: 0000000000000009 R12: dffffc0000000000 [ 71.501273][ T6548] R13: 1ffff110033f80f9 R14: 0000000000000003 R15: ffff888019fc0780 [ 71.509245][ T6548] FS: 00000000013b5300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 [ 71.518277][ T6548] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 71.524851][ T6548] CR2: 00000000004ae0f0 CR3: 000000001d355000 CR4: 00000000001506f0 [ 71.532900][ T6548] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 71.540864][ T6548] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 71.548821][ T6548] Call Trace: [ 71.552092][ T6548] io_sendmsg+0x98/0x640 [ 71.556327][ T6548] ? io_setup_async_msg+0x310/0x310 [ 71.561513][ T6548] ? kasan_save_stack+0x32/0x40 [ 71.566349][ T6548] ? kasan_save_stack+0x1b/0x40 [ 71.571193][ T6548] ? kasan_record_aux_stack+0xe9/0x110 [ 71.576670][ T6548] ? task_work_add+0x3a/0x190 [ 71.581351][ T6548] ? io_req_task_work_add+0x236/0x520 [ 71.586884][ T6548] ? io_req_complete_post+0x43e/0xa50 [ 71.592266][ T6548] ? mark_lock+0xef/0x17b0 [ 71.596669][ T6548] ? mark_lock+0xef/0x17b0 [ 71.601357][ T6548] ? lock_chain_count+0x20/0x20 [ 71.606366][ T6548] ? other_cnt_show+0x80/0xf0 [ 71.611045][ T6548] ? lock_chain_count+0x20/0x20 [ 71.616014][ T6548] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 71.621997][ T6548] ? mark_lock+0xef/0x17b0 [ 71.626527][ T6548] ? lock_chain_count+0x20/0x20 [ 71.631480][ T6548] io_issue_sqe+0x14de/0x6ba0 [ 71.636171][ T6548] ? __lock_acquire+0xbc2/0x54a0 [ 71.641108][ T6548] ? io_write+0xed0/0xed0 [ 71.645440][ T6548] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 71.651429][ T6548] ? lock_release+0x720/0x720 [ 71.656112][ T6548] __io_queue_sqe+0x90/0xb50 [ 71.660967][ T6548] ? io_issue_sqe+0x6ba0/0x6ba0 [ 71.665823][ T6548] ? tctx_task_work+0x11e/0x610 [ 71.670677][ T6548] ? lock_downgrade+0x6e0/0x6e0 [ 71.675560][ T6548] ? rwlock_bug.part.0+0x90/0x90 [ 71.680692][ T6548] io_req_task_submit+0xbf/0x1b0 [ 71.685656][ T6548] tctx_task_work+0x166/0x610 [ 71.690339][ T6548] ? io_fallback_req_func+0x3e0/0x3e0 [ 71.695790][ T6548] ? rwlock_bug.part.0+0x90/0x90 [ 71.700729][ T6548] ? _raw_spin_unlock_irq+0x1f/0x40 [ 71.705928][ T6548] task_work_run+0xdd/0x1a0 [ 71.710442][ T6548] exit_to_user_mode_prepare+0x256/0x290 [ 71.716089][ T6548] syscall_exit_to_user_mode+0x19/0x60 [ 71.721549][ T6548] do_syscall_64+0x42/0xb0 [ 71.725957][ T6548] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 71.731930][ T6548] RIP: 0033:0x43fd49 [ 71.735812][ T6548] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 71.755415][ T6548] RSP: 002b:00007ffd6347b9d8 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa [ 71.763838][ T6548] RAX: 0000000000001000 RBX: 0000000000000003 RCX: 000000000043fd49 [ 71.771889][ T6548] RDX: 0000000000000000 RSI: 000000000000688c RDI: 0000000000000003 [ 71.779941][ T6548] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 71.787905][ T6548] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004035d0 [ 71.795867][ T6548] R13: 431bde82d7b634db R14: 00000000004ae018 R15: 0000000000400488 [ 71.803831][ T6548] Modules linked in: [ 71.809351][ T6548] ---[ end trace aa9bf60339277d03 ]--- [ 71.814880][ T6548] RIP: 0010:sock_from_file+0x20/0x90 [ 71.820192][ T6548] Code: f5 ff ff ff c3 0f 1f 44 00 00 41 54 53 48 89 fb e8 85 e9 62 fa 48 8d 7b 28 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 4f 45 31 e4 48 81 7b 28 80 f1 8a 8a 74 0c e8 58 e9 [ 71.840053][ T6548] RSP: 0018:ffffc90002caf8e8 EFLAGS: 00010206 [ 71.846364][ T6548] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 71.855059][ T6548] RDX: 0000000000000005 RSI: ffffffff8713203b RDI: 0000000000000028 [ 71.863549][ T6548] RBP: ffff888019fc0780 R08: ffffffff899aee40 R09: ffffffff81e21978 [ 71.872086][ T6548] R10: 0000000000000027 R11: 0000000000000009 R12: dffffc0000000000 [ 71.880098][ T6548] R13: 1ffff110033f80f9 R14: 0000000000000003 R15: ffff888019fc0780 [ 71.888158][ T6548] FS: 00000000013b5300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 71.897534][ T6548] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 71.904617][ T6548] CR2: 00007f2cc6f84000 CR3: 000000001d355000 CR4: 00000000001506e0 [ 71.912659][ T6548] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 71.920735][ T6548] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 71.928770][ T6548] Kernel panic - not syncing: Fatal exception [ 71.936313][ T6548] Kernel Offset: disabled [ 71.940630][ T6548] Rebooting in 86400 seconds..