[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.7' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 125.586107][ T8861] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 125.594195][ T8861] #PF: supervisor instruction fetch in kernel mode [ 125.600669][ T8861] #PF: error_code(0x0010) - not-present page [ 125.606616][ T8861] PGD a8cfc067 P4D a8cfc067 PUD 9d06b067 PMD 0 [ 125.612830][ T8861] Oops: 0010 [#1] PREEMPT SMP KASAN [ 125.617997][ T8861] CPU: 0 PID: 8861 Comm: io_wqe_worker-0 Not tainted 5.8.0-syzkaller #0 [ 125.626294][ T8861] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 125.636387][ T8861] RIP: 0010:0x0 [ 125.639827][ T8861] Code: Bad RIP value. [ 125.643872][ T8861] RSP: 0018:ffffc9000b3ff830 EFLAGS: 00010246 [ 125.649918][ T8861] RAX: 1ffffffff110c498 RBX: ffffffff888624c0 RCX: ffff8880a23d6a88 [ 125.657860][ T8861] RDX: 000000000000003c RSI: 0000000020000740 RDI: ffff8880937f0cc0 [ 125.665805][ T8861] RBP: ffffc9000b3ff958 R08: ffffffff81d601f1 R09: ffffffff81d4df54 [ 125.673745][ T8861] R10: 0000000000000021 R11: ffff888096a54480 R12: 000000000000003c [ 125.681686][ T8861] R13: 0000000020000740 R14: 0000000000000000 R15: 000000000000003c [ 125.689628][ T8861] FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 125.698524][ T8861] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 125.705074][ T8861] CR2: ffffffffffffffd6 CR3: 0000000097d03000 CR4: 00000000001506f0 [ 125.713016][ T8861] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 125.720954][ T8861] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 125.728890][ T8861] Call Trace: [ 125.732150][ T8861] loop_rw_iter+0x33a/0x470 [ 125.736623][ T8861] io_write+0x71c/0xe90 [ 125.740748][ T8861] ? mark_lock+0x102/0x1b00 [ 125.745220][ T8861] ? mark_lock+0x102/0x1b00 [ 125.749689][ T8861] io_issue_sqe+0x396f/0xb8c0 [ 125.754340][ T8861] ? __lock_acquire+0x1161/0x2ab0 [ 125.759332][ T8861] ? mark_lock+0x102/0x1b00 [ 125.763805][ T8861] ? trace_lock_release+0x137/0x1a0 [ 125.768983][ T8861] ? do_raw_spin_unlock+0x134/0x8d0 [ 125.774147][ T8861] io_wq_submit_work+0x35e/0x590 [ 125.779050][ T8861] ? override_creds+0xf5/0x180 [ 125.783781][ T8861] io_worker_handle_work+0xf8f/0x1570 [ 125.789126][ T8861] io_wqe_worker+0x2ff/0x810 [ 125.793686][ T8861] kthread+0x37e/0x3a0 [ 125.797719][ T8861] ? create_io_worker+0x5f0/0x5f0 [ 125.802706][ T8861] ? kthread_blkcg+0xd0/0xd0 [ 125.807261][ T8861] ret_from_fork+0x1f/0x30 [ 125.811660][ T8861] Modules linked in: [ 125.815523][ T8861] CR2: 0000000000000000 [ 125.820695][ T8861] ---[ end trace 9d4a6aa6c576d3e5 ]--- [ 125.826271][ T8861] RIP: 0010:0x0 [ 125.829793][ T8861] Code: Bad RIP value. [ 125.833985][ T8861] RSP: 0018:ffffc9000b3ff830 EFLAGS: 00010246 [ 125.840121][ T8861] RAX: 1ffffffff110c498 RBX: ffffffff888624c0 RCX: ffff8880a23d6a88 [ 125.848147][ T8861] RDX: 000000000000003c RSI: 0000000020000740 RDI: ffff8880937f0cc0 [ 125.856151][ T8861] RBP: ffffc9000b3ff958 R08: ffffffff81d601f1 R09: ffffffff81d4df54 [ 125.864821][ T8861] R10: 0000000000000021 R11: ffff888096a54480 R12: 000000000000003c [ 125.872815][ T8861] R13: 0000000020000740 R14: 0000000000000000 R15: 000000000000003c [ 125.880769][ T8861] FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 125.889707][ T8861] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 125.896317][ T8861] CR2: ffffffffffffffd6 CR3: 0000000097d03000 CR4: 00000000001506f0 [ 125.904312][ T8861] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 125.912314][ T8861] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 125.920284][ T8861] Kernel panic - not syncing: Fatal exception [ 125.927421][ T8861] Kernel Offset: disabled [ 125.931727][ T8861] Rebooting in 86400 seconds..