[ 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 '10.128.0.76' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 63.197393][ T6836] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 63.205215][ T6836] #PF: supervisor instruction fetch in kernel mode [ 63.211685][ T6836] #PF: error_code(0x0010) - not-present page [ 63.217655][ T6836] PGD a7080067 P4D a7080067 PUD 9eae5067 PMD 0 [ 63.223873][ T6836] Oops: 0010 [#1] PREEMPT SMP KASAN [ 63.229041][ T6836] CPU: 0 PID: 6836 Comm: io_wqe_worker-0 Not tainted 5.8.0-syzkaller #0 [ 63.237351][ T6836] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.247381][ T6836] RIP: 0010:0x0 [ 63.250817][ T6836] Code: Bad RIP value. [ 63.254899][ T6836] RSP: 0018:ffffc9000536f910 EFLAGS: 00010246 [ 63.260934][ T6836] RAX: 1ffffffff10b0b9b RBX: dffffc0000000000 RCX: ffff88809ed26cc8 [ 63.268877][ T6836] RDX: 00000000000000a3 RSI: 0000000020000240 RDI: ffff88809a317840 [ 63.276822][ T6836] RBP: 0000000020000240 R08: 0000000000000001 R09: ffff8880940a0b08 [ 63.284766][ T6836] R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000536fa28 [ 63.292748][ T6836] R13: ffffffff88585cc0 R14: 00000000000000a3 R15: 0000000000000001 [ 63.300697][ T6836] FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 63.309593][ T6836] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 63.316149][ T6836] CR2: ffffffffffffffd6 CR3: 00000000a1272000 CR4: 00000000001506f0 [ 63.324095][ T6836] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 63.332037][ T6836] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 63.339978][ T6836] Call Trace: [ 63.343243][ T6836] loop_rw_iter.part.0+0x26e/0x450 [ 63.348328][ T6836] ? rw_verify_area+0x11d/0x360 [ 63.353147][ T6836] io_write+0x6a2/0x7a0 [ 63.357292][ T6836] ? io_read+0xb60/0xb60 [ 63.361515][ T6836] ? mark_lock+0xbc/0x1710 [ 63.365909][ T6836] ? __lock_acquire+0x16cb/0x5640 [ 63.370918][ T6836] io_issue_sqe+0x1b0/0x60d0 [ 63.375488][ T6836] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 63.381442][ T6836] ? lockdep_hardirqs_on+0x76/0xf0 [ 63.386530][ T6836] ? kthread_use_mm+0x1dc/0x430 [ 63.391397][ T6836] ? io_uring_setup+0x28c0/0x28c0 [ 63.396399][ T6836] ? lock_downgrade+0x830/0x830 [ 63.401223][ T6836] ? kthread_use_mm+0x19b/0x430 [ 63.406049][ T6836] ? io_wq_submit_work+0x183/0x3d0 [ 63.411131][ T6836] io_wq_submit_work+0x183/0x3d0 [ 63.416041][ T6836] io_worker_handle_work+0xa45/0x13f0 [ 63.421386][ T6836] io_wqe_worker+0xbf0/0x10e0 [ 63.426036][ T6836] ? io_worker_handle_work+0x13f0/0x13f0 [ 63.431638][ T6836] ? lockdep_hardirqs_on+0x76/0xf0 [ 63.436850][ T6836] ? __kthread_parkme+0x13f/0x1e0 [ 63.441856][ T6836] ? io_worker_handle_work+0x13f0/0x13f0 executing program executing program [ 63.447463][ T6836] kthread+0x3b5/0x4a0 [ 63.451511][ T6836] ? __kthread_bind_mask+0xc0/0xc0 [ 63.456592][ T6836] ? __kthread_bind_mask+0xc0/0xc0 [ 63.461678][ T6836] ret_from_fork+0x1f/0x30 [ 63.466066][ T6836] Modules linked in: [ 63.469932][ T6836] CR2: 0000000000000000 [ 63.475423][ T6836] ---[ end trace a35f4299b6f575bb ]--- [ 63.480881][ T6836] RIP: 0010:0x0 [ 63.484542][ T6836] Code: Bad RIP value. [ 63.489540][ T6836] RSP: 0018:ffffc9000536f910 EFLAGS: 00010246 executing program executing program executing program executing program executing program executing program executing program [ 63.495823][ T6836] RAX: 1ffffffff10b0b9b RBX: dffffc0000000000 RCX: ffff88809ed26cc8 [ 63.503946][ T6836] RDX: 00000000000000a3 RSI: 0000000020000240 RDI: ffff88809a317840 [ 63.511929][ T6836] RBP: 0000000020000240 R08: 0000000000000001 R09: ffff8880940a0b08 [ 63.520117][ T6836] R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000536fa28 [ 63.528331][ T6836] R13: ffffffff88585cc0 R14: 00000000000000a3 R15: 0000000000000001 [ 63.536619][ T6836] FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 executing program executing program executing program executing program [ 63.545910][ T6836] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 63.552502][ T6836] CR2: ffffffffffffffd6 CR3: 00000000a1272000 CR4: 00000000001506f0 [ 63.560821][ T6836] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 63.569098][ T6836] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 63.577409][ T6836] Kernel panic - not syncing: Fatal exception [ 63.584809][ T6836] Kernel Offset: disabled [ 63.589121][ T6836] Rebooting in 86400 seconds..