[ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Started OpenBSD Secure Shell server. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.40' (ECDSA) to the list of known hosts. syzkaller login: [ 72.791794][ T8479] BUG: unable to handle page fault for address: ffffffffc1defce0 [ 72.799532][ T8479] #PF: supervisor instruction fetch in kernel mode [ 72.806014][ T8479] #PF: error_code(0x0010) - not-present page [ 72.811968][ T8479] PGD bc8f067 P4D bc8f067 PUD bc91067 PMD 0 [ 72.817947][ T8479] Oops: 0010 [#1] PREEMPT SMP KASAN [ 72.823126][ T8479] CPU: 1 PID: 8479 Comm: iou-wrk-8440 Not tainted 5.13.0-rc1-syzkaller #0 [ 72.831699][ T8479] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 72.841736][ T8479] RIP: 0010:0xffffffffc1defce0 [ 72.846490][ T8479] Code: Unable to access opcode bytes at RIP 0xffffffffc1defcb6. [ 72.854180][ T8479] RSP: 0018:ffffc9000161f8f8 EFLAGS: 00010246 [ 72.860227][ T8479] RAX: ffffffffc1defce0 RBX: 0000000000000000 RCX: 0000000000000000 [ 72.868181][ T8479] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880187eb8c0 [ 72.876134][ T8479] RBP: ffff8880187eb8c0 R08: 0000000000000000 R09: 0000000000002000 [ 72.884102][ T8479] R10: ffffffff81df1723 R11: 0000000000004000 R12: 0000000000000000 [ 72.892162][ T8479] R13: ffff8880187eb918 R14: ffff8880187eb900 R15: ffffffffc1defce0 [ 72.900378][ T8479] FS: 0000000001212300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 72.909300][ T8479] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 72.915872][ T8479] CR2: ffffffffc1defcb6 CR3: 00000000139d9000 CR4: 00000000001506e0 [ 72.923826][ T8479] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 72.931793][ T8479] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 72.939757][ T8479] Call Trace: [ 72.943025][ T8479] ? kiocb_done+0x1c0/0x730 [ 72.947535][ T8479] ? io_read+0x35c/0xeb0 [ 72.951766][ T8479] ? call_rcu_zapped+0xb0/0xb0 [ 72.956525][ T8479] ? __do_sys_io_uring_register+0x2f00/0x2f00 [ 72.962598][ T8479] ? lock_chain_count+0x20/0x20 [ 72.967445][ T8479] ? lockdep_unlock+0x11c/0x290 [ 72.972284][ T8479] ? register_lock_class+0x55e/0x1180 [ 72.977648][ T8479] ? lockdep_lock+0xc6/0x200 [ 72.982238][ T8479] ? call_rcu_zapped+0xb0/0xb0 [ 72.986989][ T8479] ? lockdep_unlock+0x11c/0x290 [ 72.991845][ T8479] ? __lock_acquire+0x251c/0x5230 [ 72.996881][ T8479] ? io_issue_sqe+0x1f3/0x66b0 [ 73.001651][ T8479] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 73.007632][ T8479] ? lockdep_unlock+0x11c/0x290 [ 73.012472][ T8479] ? io_write+0xe50/0xe50 [ 73.016803][ T8479] ? find_held_lock+0x2d/0x110 [ 73.021565][ T8479] ? io_worker_handle_work+0x5a8/0x1790 [ 73.027102][ T8479] ? lock_downgrade+0x6e0/0x6e0 [ 73.031945][ T8479] ? do_raw_spin_lock+0x120/0x2b0 [ 73.036973][ T8479] ? io_wq_submit_work+0x29e/0x430 [ 73.042075][ T8479] ? io_worker_handle_work+0xaa3/0x1790 [ 73.047616][ T8479] ? io_wqe_worker+0x2ef/0xd40 [ 73.052368][ T8479] ? io_worker_handle_work+0x1790/0x1790 [ 73.057990][ T8479] ? ret_from_fork+0x8/0x30 [ 73.062477][ T8479] ? lock_downgrade+0x6e0/0x6e0 [ 73.067317][ T8479] ? do_raw_spin_lock+0x120/0x2b0 [ 73.072323][ T8479] ? rwlock_bug.part.0+0x90/0x90 [ 73.077245][ T8479] ? _raw_spin_unlock_irq+0x1f/0x40 [ 73.082453][ T8479] ? io_worker_handle_work+0x1790/0x1790 [ 73.088074][ T8479] ? ret_from_fork+0x1f/0x30 [ 73.092654][ T8479] Modules linked in: [ 73.096528][ T8479] CR2: ffffffffc1defce0 [ 73.100664][ T8479] ---[ end trace a41da77ef833bc79 ]--- [ 73.109220][ T8479] RIP: 0010:0xffffffffc1defce0 [ 73.113976][ T8479] Code: Unable to access opcode bytes at RIP 0xffffffffc1defcb6. [ 73.121673][ T8479] RSP: 0018:ffffc9000161f8f8 EFLAGS: 00010246 [ 73.127731][ T8479] RAX: ffffffffc1defce0 RBX: 0000000000000000 RCX: 0000000000000000 [ 73.135688][ T8479] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880187eb8c0 [ 73.143646][ T8479] RBP: ffff8880187eb8c0 R08: 0000000000000000 R09: 0000000000002000 [ 73.151604][ T8479] R10: ffffffff81df1723 R11: 0000000000004000 R12: 0000000000000000 [ 73.159564][ T8479] R13: ffff8880187eb918 R14: ffff8880187eb900 R15: ffffffffc1defce0 [ 73.167527][ T8479] FS: 0000000001212300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 73.176446][ T8479] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 73.183018][ T8479] CR2: ffffffffc1defcb6 CR3: 00000000139d9000 CR4: 00000000001506e0 [ 73.191002][ T8479] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 73.198960][ T8479] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 73.206916][ T8479] Kernel panic - not syncing: Fatal exception [ 73.213580][ T8479] Kernel Offset: disabled [ 73.217888][ T8479] Rebooting in 86400 seconds..