[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.142' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 596.211150][ T1659] INFO: task syz-executor880:8534 can't die for more than 143 seconds. [ 596.219646][ T1659] task:syz-executor880 state:R running task stack:25304 pid: 8534 ppid: 8504 flags:0x00004006 [ 596.310850][ T1659] Call Trace: [ 596.314242][ T1659] __schedule+0x890/0x2030 [ 596.318774][ T1659] ? io_schedule_timeout+0x140/0x140 [ 596.390938][ T1659] ? lockdep_hardirqs_on+0x79/0x100 [ 596.396231][ T1659] ? shrink_inactive_list+0x2ba/0xce0 [ 596.460883][ T1659] ? preempt_schedule_thunk+0x16/0x18 [ 596.466336][ T1659] preempt_schedule_common+0x45/0xc0 [ 596.530887][ T1659] preempt_schedule_thunk+0x16/0x18 [ 596.536148][ T1659] _raw_spin_unlock_irq+0x3c/0x40 [ 596.610851][ T1659] shrink_inactive_list+0x4b1/0xce0 [ 596.616111][ T1659] ? isolate_lru_pages+0x1230/0x1230 [ 596.690901][ T1659] ? lock_chain_count+0x20/0x20 [ 596.695821][ T1659] shrink_lruvec+0x61b/0x11b0 [ 596.700521][ T1659] ? shrink_active_list+0x1340/0x1340 [ 596.770906][ T1659] ? mem_cgroup_iter+0x28c/0x760 [ 596.775895][ T1659] ? lock_downgrade+0x6d0/0x6d0 [ 596.850800][ T1659] shrink_node+0x839/0x1d60 [ 596.855381][ T1659] do_try_to_free_pages+0x38b/0x1440 [ 596.910785][ T1659] ? shrink_node+0x1d60/0x1d60 [ 596.915864][ T1659] try_to_free_pages+0x29f/0x720 [ 596.970773][ T1659] ? reclaim_pages+0xcd0/0xcd0 [ 596.975608][ T1659] ? _raw_spin_unlock_irq+0x1f/0x40 [ 597.050943][ T1659] __alloc_pages_slowpath.constprop.0+0x917/0x2510 [ 597.057544][ T1659] ? warn_alloc+0x120/0x120 [ 597.120845][ T1659] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 597.127902][ T1659] ? lock_downgrade+0x6d0/0x6d0 [ 597.210809][ T1659] ? __zone_watermark_ok+0x440/0x440 [ 597.216156][ T1659] __alloc_pages_nodemask+0x5f0/0x730 [ 597.280735][ T1659] ? lock_downgrade+0x6d0/0x6d0 [ 597.285985][ T1659] ? __alloc_pages_slowpath.constprop.0+0x2510/0x2510 [ 597.350847][ T1659] alloc_pages_current+0x191/0x2a0 [ 597.356145][ T1659] __page_cache_alloc+0x2ce/0x360 [ 597.420732][ T1659] ? page_cache_ra_unbounded+0x398/0x920 [ 597.426418][ T1659] page_cache_ra_unbounded+0x3a1/0x920 [ 597.490791][ T1659] ? read_pages+0x8d0/0x8d0 [ 597.495359][ T1659] do_page_cache_ra+0xf9/0x140 [ 597.500128][ T1659] filemap_fault+0x19d0/0x2940 [ 597.600858][ T1659] ? read_cache_page_gfp+0x30/0x30 [ 597.606022][ T1659] ? __raw_spin_lock_init+0x34/0x100 [ 597.660850][ T1659] __do_fault+0x10d/0x4d0 [ 597.665232][ T1659] handle_mm_fault+0x3033/0x55d0 [ 597.670202][ T1659] ? vm_iomap_memory+0x190/0x190 [ 597.750727][ T1659] ? vmacache_update+0xce/0x140 [ 597.755757][ T1659] do_user_addr_fault+0x55b/0xba0 [ 597.820692][ T1659] exc_page_fault+0x9e/0x180 [ 597.825351][ T1659] ? asm_exc_page_fault+0x8/0x30 [ 597.830479][ T1659] asm_exc_page_fault+0x1e/0x30 [ 597.940668][ T1659] RIP: 0033:0x400e71 [ 597.944605][ T1659] Code: Unable to access opcode bytes at RIP 0x400e47. [ 598.020669][ T1659] RSP: 002b:00007f8a5353fdc0 EFLAGS: 00010246 [ 598.026824][ T1659] RAX: 6c756e2f7665642f RBX: 00000000006dbc38 RCX: 0000000000402824 [ 598.100748][ T1659] RDX: 928195da81441750 RSI: 0000000000000000 RDI: 00000000006dbc30 [ 598.108853][ T1659] RBP: 00000000006dbc30 R08: 0000000000000000 R09: 00007f8a53540700 [ 598.218048][ T1659] R10: 00007f8a535409d0 R11: 0000000000000202 R12: 00000000006dbc3c [ 598.280656][ T1659] R13: 00007ffe80747a5f R14: 00007f8a535409c0 R15: 0000000000000001 [ 598.311625][ T1659] [ 598.311625][ T1659] Showing all locks held in the system: [ 598.370840][ T1659] 1 lock held by khungtaskd/1659: [ 598.375870][ T1659] #0: ffffffff8b339ce0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 598.500726][ T1659] 1 lock held by kswapd0/2195: [ 598.505530][ T1659] 1 lock held by kswapd1/2196: [ 598.510408][ T1659] 1 lock held by in:imklog/8191: [ 598.570602][ T1659] #0: ffff8880125b1270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 598.579877][ T1659] 1 lock held by cron/8189: [ 598.680690][ T1659] 2 locks held by syz-executor880/8502: [ 598.686281][ T1659] 2 locks held by syz-executor880/8505: [ 598.760679][ T1659] 2 locks held by syz-executor880/8507: [ 598.766362][ T1659] 2 locks held by syz-executor880/11706: [ 598.830596][ T1659] 2 locks held by syz-executor880/11709: [ 598.836277][ T1659] 3 locks held by syz-executor880/12008: [ 598.900595][ T1659] 2 locks held by syz-executor880/12015: [ 598.930842][ T1659] [ 598.933213][ T1659] ============================================= [ 598.933213][ T1659] [ 599.010818][ T1659] Kernel panic - not syncing: hung_task: blocked tasks [ 599.017691][ T1659] CPU: 1 PID: 1659 Comm: khungtaskd Not tainted 5.10.0-rc3-next-20201116-syzkaller #0 [ 599.027225][ T1659] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 599.037277][ T1659] Call Trace: [ 599.040614][ T1659] dump_stack+0x107/0x163 [ 599.044959][ T1659] panic+0x306/0x73d [ 599.048866][ T1659] ? __warn_printk+0xf3/0xf3 [ 599.053471][ T1659] ? watchdog.cold+0x22d/0x248 [ 599.058281][ T1659] ? watchdog+0xc59/0xf30 [ 599.062621][ T1659] watchdog.cold+0x23e/0x248 [ 599.067216][ T1659] ? trace_sched_process_hang+0x280/0x280 [ 599.072990][ T1659] kthread+0x3af/0x4a0 [ 599.077080][ T1659] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 599.084123][ T1659] ret_from_fork+0x1f/0x30 [ 599.089392][ T1659] Kernel Offset: disabled [ 599.093851][ T1659] Rebooting in 86400 seconds..