[ 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 '10.128.0.221' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 710.120645] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 710.121456] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 710.148964] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 710.159420] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 710.179717] hrtimer: interrupt took 32418 ns [ 815.177393] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: [ 815.185443] rcu: (detected by 0, t=10502 jiffies, g=5397, q=134) [ 815.191712] rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4295018525-4295008022), jiffies_till_next_fqs=1, root ->qsmask 0x0 [ 815.205410] syz-executor891 R running task 24656 8153 8149 0x80000000 [ 815.212706] Call Trace: [ 815.215290] [ 815.217627] sched_show_task.cold+0x332/0x396 [ 815.222168] ? __se_sys_sched_getattr+0x480/0x480 [ 815.227096] rcu_check_callbacks.cold+0xb37/0xe19 [ 815.232017] update_process_times+0x2a/0xb0 [ 815.236523] tick_sched_handle+0x9b/0x180 [ 815.240701] tick_sched_timer+0xfc/0x290 [ 815.244770] __hrtimer_run_queues+0x3f6/0xe60 [ 815.249274] ? tick_nohz_restart_sched_tick+0x310/0x310 [ 815.254650] ? retrigger_next_event+0x220/0x220 [ 815.259393] ? kvm_clock_get_cycles+0x14/0x30 [ 815.263980] ? ktime_get_update_offsets_now+0x2ec/0x460 [ 815.269361] hrtimer_interrupt+0x32a/0x930 [ 815.274289] ? check_preemption_disabled+0x41/0x280 [ 815.279674] smp_apic_timer_interrupt+0x10c/0x550 [ 815.284541] apic_timer_interrupt+0xf/0x20 [ 815.288861] [ 815.291172] RIP: 0010:__read_once_size_nocheck.constprop.0+0x3/0x10 [ 815.297614] Code: 00 75 18 48 8b 43 48 5b 5d c3 e8 a8 9d 70 00 eb a8 48 89 ef e8 2e 9e 70 00 eb c4 48 89 ef e8 24 9e 70 00 eb de 66 90 48 8b 07 <48> 89 06 c3 66 0f 1f 84 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff [ 815.316526] RSP: 0018:ffff8880b136e940 EFLAGS: 00000283 ORIG_RAX: ffffffffffffff13 [ 815.324244] RAX: ffffffff818356c5 RBX: 1ffff1101626dd2a RCX: 0000000000000000 [ 815.331516] RDX: ffff8880b136eb10 RSI: ffff8880b136e970 RDI: ffff8880b136f248 [ 815.338817] RBP: ffff8880b136f248 R08: ffffffff8b97f2d6 R09: ffffffff8b97f2d7 [ 815.346206] R10: 0000000000074071 R11: 0000000000000001 R12: ffff8880b136eac8 [ 815.353583] R13: ffff8880b136eb10 R14: ffff8880b1368000 R15: ffff8880b136eac8 [ 815.360949] ? ondemand_readahead.isra.0+0x575/0xd40 [ 815.366077] deref_stack_reg+0x134/0x1d0 [ 815.370180] ? __read_once_size_nocheck.constprop.0+0x10/0x10 [ 815.377005] unwind_next_frame+0xec4/0x1c60 [ 815.381545] ? __do_page_cache_readahead+0x5c6/0x6c0 [ 815.386691] ? deref_stack_reg+0x1d0/0x1d0 [ 815.390998] ? is_bpf_text_address+0xfc/0x1b0 [ 815.395676] ? kernel_text_address+0xbd/0xf0 [ 815.400094] ? __do_page_cache_readahead+0x5c6/0x6c0 [ 815.405280] __save_stack_trace+0x9f/0x190 [ 815.409590] ? __lock_acquire+0x6de/0x3ff0 [ 815.413871] ? __do_page_cache_readahead+0x5c6/0x6c0 [ 815.419038] kasan_kmalloc+0xeb/0x160 [ 815.422850] ? kmem_cache_alloc+0x122/0x370 [ 815.427247] ? alloc_buffer_head+0x20/0x130 [ 815.431575] ? alloc_page_buffers+0x169/0x5c0 [ 815.436088] ? create_empty_buffers+0x2c/0x760 [ 815.440669] ? create_page_buffers+0x212/0x350 [ 815.445267] ? block_read_full_page+0xcf/0xd10 [ 815.449850] ? read_pages.isra.0+0x329/0x5d0 [ 815.454258] ? __do_page_cache_readahead+0x5c6/0x6c0 [ 815.459359] ? ondemand_readahead.isra.0+0x575/0xd40 [ 815.464462] ? page_cache_async_readahead+0x406/0x750 [ 815.469727] ? generic_file_read_iter+0x16ac/0x2b60 [ 815.475139] ? __vfs_read+0x518/0x750 [ 815.479009] ? integrity_kernel_read+0x147/0x1f0 [ 815.483835] ? ima_calc_file_hash+0x512/0x990 [ 815.488335] ? ima_collect_measurement+0x4c4/0x570 [ 815.493269] ? process_measurement+0xddd/0x1440 [ 815.497940] ? ima_file_check+0xb9/0x100 [ 815.502320] ? path_openat+0x7e4/0x2df0 [ 815.506318] ? do_filp_open+0x18c/0x3f0 [ 815.511336] ? do_sys_open+0x3b3/0x520 [ 815.515246] ? do_syscall_64+0xf9/0x620 [ 815.519289] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 815.524653] ? retint_kernel+0x2d/0x2d [ 815.528545] ? __lock_acquire+0x6de/0x3ff0 [ 815.532827] ? get_mem_cgroup_from_page+0xfa/0x3b0 [ 815.537778] ? lock_downgrade+0x720/0x720 [ 815.541942] ? lock_acquire+0x170/0x3c0 [ 815.545919] ? get_mem_cgroup_from_page+0x7a/0x3b0 [ 815.551472] ? check_preemption_disabled+0x41/0x280 [ 815.556490] ? mark_held_locks+0xa6/0xf0 [ 815.560569] ? kmem_cache_alloc+0x2b1/0x370 [ 815.564894] kmem_cache_alloc+0x122/0x370 [ 815.569049] alloc_buffer_head+0x20/0x130 [ 815.573308] alloc_page_buffers+0x169/0x5c0 [ 815.577742] create_empty_buffers+0x2c/0x760 [ 815.583384] ? read_pages.isra.0+0x2e4/0x5d0 [ 815.587803] create_page_buffers+0x212/0x350 [ 815.592238] block_read_full_page+0xcf/0xd10 [ 815.596672] ? page_cache_tree_insert+0x3f0/0x3f0 [ 815.601586] ? minix_mknod+0x1a0/0x1a0 [ 815.605485] ? __lru_cache_add+0x1e3/0x2c0 [ 815.609730] ? __bread_gfp+0x300/0x300 [ 815.613621] ? add_to_page_cache_lru+0x259/0x680 [ 815.618386] ? add_to_page_cache_locked+0x40/0x40 [ 815.623237] ? __lru_cache_add+0x1e3/0x2c0 [ 815.627479] read_pages.isra.0+0x329/0x5d0 [ 815.631721] ? rcu_nmi_exit+0xb3/0x180 [ 815.635612] ? read_cache_pages+0x750/0x750 [ 815.639950] ? retint_kernel+0x2d/0x2d [ 815.643844] ? __do_page_cache_readahead+0x293/0x6c0 [ 815.648953] __do_page_cache_readahead+0x5c6/0x6c0 [ 815.653892] ? read_pages.isra.0+0x5d0/0x5d0 [ 815.658302] ? page_cache_async_readahead+0x3a7/0x750 [ 815.663498] ondemand_readahead.isra.0+0x575/0xd40 [ 815.668525] page_cache_async_readahead+0x406/0x750 [ 815.673571] generic_file_read_iter+0x16ac/0x2b60 [ 815.678515] ? iov_iter_init+0xb8/0x1d0 [ 815.682497] __vfs_read+0x518/0x750 [ 815.686218] ? __se_sys_copy_file_range+0x410/0x410 [ 815.691253] ? kernel_fpu_enable+0x1f/0x40 [ 815.695496] ? kernel_fpu_end+0x11b/0x170 [ 815.699643] ? kernel_fpu_enable+0x40/0x40 [ 815.703906] integrity_kernel_read+0x147/0x1f0 [ 815.708488] ? integrity_inode_free+0x310/0x310 [ 815.713226] ? done_hash+0x12/0x12 [ 815.716781] ima_calc_file_hash+0x512/0x990 [ 815.721129] ? rcu_nmi_exit+0xb3/0x180 [ 815.726774] ? retint_kernel+0x2d/0x2d [ 815.730669] ? ima_alloc_tfm+0xc5/0xf0 [ 815.734584] ? ima_calc_file_hash+0x1a3/0x990 [ 815.739091] ima_collect_measurement+0x4c4/0x570 [ 815.743866] ? ima_get_action+0x90/0x90 [ 815.747857] ? ima_get_cache_status+0x1d0/0x1d0 [ 815.752537] process_measurement+0xddd/0x1440 [ 815.757048] ? ima_add_template_entry.cold+0x4d/0x4d [ 815.762202] ? aa_get_task_label+0x1e6/0x7f0 [ 815.766620] ? lock_downgrade+0x720/0x720 [ 815.770768] ? check_preemption_disabled+0x41/0x280 [ 815.775805] ? check_preemption_disabled+0x41/0x280 [ 815.780837] ? aa_get_task_label+0x20d/0x7f0 [ 815.787045] ? lockref_get+0x11/0x50 [ 815.790769] ? aa_capable+0xb80/0xb80 [ 815.794573] ? __se_sys_getgroups+0x2d0/0x2d0 [ 815.799111] ? apparmor_task_getsecid+0x88/0xc0 [ 815.804604] ima_file_check+0xb9/0x100 [ 815.808515] ? process_measurement+0x1440/0x1440 [ 815.813299] ? inode_permission+0x3d/0x140 [ 815.817543] path_openat+0x7e4/0x2df0 [ 815.821366] ? path_lookupat+0x8d0/0x8d0 [ 815.825432] ? mark_held_locks+0xf0/0xf0 [ 815.829497] ? io_schedule_timeout+0x140/0x140 [ 815.834094] do_filp_open+0x18c/0x3f0 [ 815.837896] ? may_open_dev+0xf0/0xf0 [ 815.843456] ? lock_downgrade+0x720/0x720 [ 815.847696] ? lock_acquire+0x170/0x3c0 [ 815.851759] ? __alloc_fd+0x34/0x570 [ 815.855484] ? do_raw_spin_unlock+0x171/0x230 [ 815.860597] ? _raw_spin_unlock+0x29/0x40 [ 815.864748] ? __alloc_fd+0x28d/0x570 [ 815.869193] do_sys_open+0x3b3/0x520 [ 815.873448] ? filp_open+0x70/0x70 [ 815.878082] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 815.883562] ? trace_hardirqs_off_caller+0x6e/0x210 [ 815.888600] ? do_syscall_64+0x21/0x620 [ 815.892585] do_syscall_64+0xf9/0x620 [ 815.896415] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 815.902243] RIP: 0033:0x4456e9 [ 815.906177] Code: 5d cc fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b cc fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 815.928320] RSP: 002b:00007ffd6321e1f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 815.936032] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004456e9 [ 815.943323] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200000c0 [ 815.950683] RBP: 00000000006d0018 R08: 0000000000000001 R09: 0000000000000001 [ 815.957972] R10: 0000000000000001 R11: 0000000000000246 R12: 00000000004027a0 [ 815.965241] R13: 0000000000402830 R14: 0000000000000000 R15: 0000000000000000 [ 815.976371] rcu: rcu_preempt kthread starved for 10581 jiffies! g5397 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 [ 815.987231] rcu: RCU grace-period kthread stack dump: [ 815.992421] rcu_preempt R running task 29128 10 2 0x80000000 [ 815.999644] Call Trace: [ 816.002245] __schedule+0x887/0x2040 [ 816.006271] ? io_schedule_timeout+0x140/0x140 [ 816.011385] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 816.016502] schedule+0x8d/0x1b0 [ 816.019875] schedule_timeout+0x4cf/0xfe0 [ 816.024026] ? prepare_to_swait_event+0x5b/0x540 [ 816.028795] ? usleep_range+0x170/0x170 [ 816.032775] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 816.037886] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 816.042475] ? collect_expired_timers+0x2a0/0x2a0 [ 816.047323] ? swake_up_all+0x340/0x340 [ 816.051308] rcu_gp_kthread+0xdad/0x21c0 [ 816.055383] ? lock_acquire+0x170/0x3c0 [ 816.059356] ? __rcu_read_unlock+0x160/0x160 [ 816.063804] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 816.068916] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 816.073501] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 816.078603] ? __kthread_parkme+0x133/0x1e0 [ 816.082935] ? __rcu_read_unlock+0x160/0x160 [ 816.087373] kthread+0x33f/0x460 [ 816.090742] ? kthread_park+0x180/0x180 [ 816.094725] ret_from_fork+0x24/0x30