[ 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 '10.128.0.236' (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 syzkaller login: [ 72.072629][ T8135] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 72.080514][ T8135] #PF: supervisor instruction fetch in kernel mode [ 72.086993][ T8135] #PF: error_code(0x0010) - not-present page [ 72.093068][ T8135] PGD 9699f067 P4D 9699f067 PUD 93f29067 PMD 0 [ 72.099292][ T8135] Oops: 0010 [#1] PREEMPT SMP KASAN [ 72.104467][ T8135] CPU: 0 PID: 8135 Comm: io_wqe_worker-0 Not tainted 5.8.0-syzkaller #0 [ 72.112760][ T8135] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 72.122795][ T8135] RIP: 0010:0x0 [ 72.126237][ T8135] Code: Bad RIP value. [ 72.130338][ T8135] RSP: 0018:ffffc90009837910 EFLAGS: 00010246 [ 72.136469][ T8135] RAX: 1ffffffff10b0a93 RBX: dffffc0000000000 RCX: ffff88809f037588 [ 72.144503][ T8135] RDX: 000000000000003c RSI: 0000000020000740 RDI: ffff88809e8650c0 [ 72.152459][ T8135] RBP: 0000000020000740 R08: 0000000000000001 R09: ffff888095c9ed48 [ 72.160419][ T8135] R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90009837a28 [ 72.168372][ T8135] R13: ffffffff88585480 R14: 000000000000003c R15: 0000000000000001 [ 72.176322][ T8135] FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 72.185230][ T8135] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 72.191801][ T8135] CR2: ffffffffffffffd6 CR3: 00000000956b3000 CR4: 00000000001506f0 [ 72.199774][ T8135] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 72.207855][ T8135] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 72.215805][ T8135] Call Trace: [ 72.219132][ T8135] loop_rw_iter.part.0+0x26e/0x450 [ 72.225574][ T8135] ? rw_verify_area+0x11d/0x360 [ 72.230890][ T8135] io_write+0x6a2/0x7a0 [ 72.235026][ T8135] ? io_read+0xb60/0xb60 [ 72.239333][ T8135] ? mark_lock+0xbc/0x1710 [ 72.243761][ T8135] ? lock_repin_lock+0x460/0x460 [ 72.248682][ T8135] ? __lock_acquire+0x16cb/0x5640 [ 72.253698][ T8135] io_issue_sqe+0x1b0/0x60d0 [ 72.258267][ T8135] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 72.264239][ T8135] ? lockdep_hardirqs_on+0x76/0xf0 [ 72.269336][ T8135] ? kthread_use_mm+0x15f/0x3c0 [ 72.274160][ T8135] ? io_uring_setup+0x28c0/0x28c0 [ 72.279159][ T8135] ? lock_downgrade+0x830/0x830 [ 72.283988][ T8135] ? mark_held_locks+0x9f/0xe0 [ 72.288731][ T8135] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 72.294693][ T8135] ? trace_hardirqs_on+0x5f/0x220 [ 72.299715][ T8135] ? io_wq_submit_work+0x183/0x3d0 [ 72.304802][ T8135] io_wq_submit_work+0x183/0x3d0 [ 72.309717][ T8135] io_worker_handle_work+0xa45/0x13f0 [ 72.315065][ T8135] io_wqe_worker+0xbf0/0x10e0 executing program executing program [ 72.319717][ T8135] ? io_worker_handle_work+0x13f0/0x13f0 [ 72.325528][ T8135] ? lockdep_hardirqs_on+0x76/0xf0 [ 72.330617][ T8135] ? __kthread_parkme+0x13f/0x1e0 [ 72.336311][ T8135] ? io_worker_handle_work+0x13f0/0x13f0 [ 72.341917][ T8135] kthread+0x3b5/0x4a0 [ 72.346045][ T8135] ? __kthread_bind_mask+0xc0/0xc0 [ 72.351129][ T8135] ? __kthread_bind_mask+0xc0/0xc0 [ 72.356217][ T8135] ret_from_fork+0x1f/0x30 [ 72.360606][ T8135] Modules linked in: [ 72.364487][ T8135] CR2: 0000000000000000 [ 72.401329][ T8135] ---[ end trace 5f1db3a4219c3189 ]--- [ 72.406833][ T8135] RIP: 0010:0x0 [ 72.410755][ T8135] Code: Bad RIP value. [ 72.414826][ T8135] RSP: 0018:ffffc90009837910 EFLAGS: 00010246 [ 72.420981][ T8135] RAX: 1ffffffff10b0a93 RBX: dffffc0000000000 RCX: ffff88809f037588 [ 72.429070][ T8135] RDX: 000000000000003c RSI: 0000000020000740 RDI: ffff88809e8650c0 [ 72.437049][ T8135] RBP: 0000000020000740 R08: 0000000000000001 R09: ffff888095c9ed48 executing program executing program executing program [ 72.445099][ T8135] R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90009837a28 [ 72.453561][ T8135] R13: ffffffff88585480 R14: 000000000000003c R15: 0000000000000001 [ 72.461952][ T8135] FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 72.475037][ T8135] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 72.484124][ T8135] CR2: ffffffffffffffd6 CR3: 00000000956b3000 CR4: 00000000001506f0 [ 72.492570][ T8135] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 72.500947][ T8135] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 72.509368][ T8135] Kernel panic - not syncing: Fatal exception [ 72.516582][ T8135] Kernel Offset: disabled [ 72.520900][ T8135] Rebooting in 86400 seconds..