[ 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. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.33' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 728.978572] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 728.978575] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 728.998720] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 729.009930] hrtimer: interrupt took 223516 ns [ 729.025787] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 834.060967] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: [ 834.067305] rcu: (detected by 1, t=10502 jiffies, g=5293, q=39) [ 834.073456] rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4295020416-4295009913), jiffies_till_next_fqs=1, root ->qsmask 0x0 [ 834.086109] syz-executor456 R running task 24608 8112 8111 0x80000000 [ 834.093339] Call Trace: [ 834.095939] [ 834.098188] sched_show_task.cold+0x332/0x396 [ 834.102722] ? __se_sys_sched_getattr+0x480/0x480 [ 834.107618] rcu_check_callbacks.cold+0xb37/0xe19 [ 834.112512] update_process_times+0x2a/0xb0 [ 834.116881] tick_sched_handle+0x9b/0x180 [ 834.121031] tick_sched_timer+0xfc/0x290 [ 834.125094] __hrtimer_run_queues+0x3f6/0xe60 [ 834.129599] ? tick_nohz_restart_sched_tick+0x310/0x310 [ 834.135053] ? retrigger_next_event+0x220/0x220 [ 834.139764] ? kvm_clock_get_cycles+0x14/0x30 [ 834.144262] ? ktime_get_update_offsets_now+0x2ec/0x460 [ 834.149648] hrtimer_interrupt+0x32a/0x930 [ 834.153926] ? check_preemption_disabled+0x41/0x280 [ 834.158994] smp_apic_timer_interrupt+0x10c/0x550 [ 834.163843] apic_timer_interrupt+0xf/0x20 [ 834.168070] [ 834.170310] RIP: 0010:unwind_next_frame+0x23f/0x1c60 [ 834.175441] Code: 00 00 fc ff df 41 89 f0 4a 8d 3c 85 2c 01 17 8c 49 89 f9 49 c1 e9 03 45 0f b6 0c 11 48 89 fa 83 e2 07 83 c2 03 44 38 ca 7c 32 <45> 84 c9 74 2d 4c 89 44 24 30 48 89 74 24 28 44 89 54 24 20 48 89 [ 834.194340] RSP: 0018:ffff8880b05869e0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 834.202049] RAX: 0000000000000000 RBX: 1ffff110160b0d44 RCX: ffffffff817f965b [ 834.209314] RDX: 0000000000000007 RSI: 0000000000007f96 RDI: ffffffff8c18ff84 [ 834.216580] RBP: 0000000000000001 R08: 0000000000007f96 R09: 0000000000000000 [ 834.223843] R10: 0000000000074071 R11: 0000000000000001 R12: ffff8880b0586b10 [ 834.231139] R13: ffff8880b0586afd R14: ffff8880b0586b00 R15: ffff8880b0586ac8 [ 834.238464] ? generic_file_read_iter+0x16ab/0x2b60 [ 834.243502] ? generic_file_read_iter+0x16ac/0x2b60 [ 834.248519] ? deref_stack_reg+0x1d0/0x1d0 [ 834.252808] ? is_bpf_text_address+0xfc/0x1b0 [ 834.257355] ? kernel_text_address+0xbd/0xf0 [ 834.261765] ? generic_file_read_iter+0x16ac/0x2b60 [ 834.266846] __save_stack_trace+0x9f/0x190 [ 834.271095] ? generic_file_read_iter+0x16ac/0x2b60 [ 834.276152] kasan_kmalloc+0xeb/0x160 [ 834.279956] ? kmem_cache_alloc+0x122/0x370 [ 834.284320] ? alloc_buffer_head+0x20/0x130 [ 834.288645] ? alloc_page_buffers+0x169/0x5c0 [ 834.293140] ? create_empty_buffers+0x2c/0x760 [ 834.297726] ? create_page_buffers+0x212/0x350 [ 834.302306] ? block_read_full_page+0xcf/0xd10 [ 834.306919] ? read_pages.isra.0+0x329/0x5d0 [ 834.311326] ? __do_page_cache_readahead+0x5c6/0x6c0 [ 834.316453] ? ondemand_readahead.isra.0+0x575/0xd40 [ 834.321560] ? page_cache_async_readahead+0x406/0x750 [ 834.326748] ? generic_file_read_iter+0x16ac/0x2b60 [ 834.331791] ? __vfs_read+0x518/0x750 [ 834.335622] ? integrity_kernel_read+0x147/0x1f0 [ 834.340381] ? ima_calc_file_hash+0x512/0x990 [ 834.344873] ? ima_collect_measurement+0x4c4/0x570 [ 834.349802] ? process_measurement+0xddd/0x1440 [ 834.354488] ? ima_file_check+0xb9/0x100 [ 834.358592] ? path_openat+0x7e4/0x2df0 [ 834.362574] ? do_filp_open+0x18c/0x3f0 [ 834.366543] ? do_sys_open+0x3b3/0x520 [ 834.370441] ? do_syscall_64+0xf9/0x620 [ 834.374416] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 834.379806] ? __lock_acquire+0x6de/0x3ff0 [ 834.384075] ? get_mem_cgroup_from_page+0xfa/0x3b0 [ 834.389018] ? lock_downgrade+0x720/0x720 [ 834.393165] ? lock_acquire+0x170/0x3c0 [ 834.397138] ? get_mem_cgroup_from_page+0x7a/0x3b0 [ 834.402067] ? check_preemption_disabled+0x41/0x280 [ 834.407091] ? mark_held_locks+0xa6/0xf0 [ 834.411157] ? kmem_cache_alloc+0x2b1/0x370 [ 834.415478] kmem_cache_alloc+0x122/0x370 [ 834.419631] alloc_buffer_head+0x20/0x130 [ 834.423780] alloc_page_buffers+0x169/0x5c0 [ 834.428128] create_empty_buffers+0x2c/0x760 [ 834.432547] ? __put_compound_page+0xc0/0xc0 [ 834.436955] create_page_buffers+0x212/0x350 [ 834.441369] block_read_full_page+0xcf/0xd10 [ 834.445773] ? pagevec_lru_move_fn+0x1ee/0x270 [ 834.450431] ? minix_mknod+0x1a0/0x1a0 [ 834.454322] ? __lru_cache_add+0x1e3/0x2c0 [ 834.458556] ? __bread_gfp+0x300/0x300 [ 834.462440] ? add_to_page_cache_lru+0x259/0x680 [ 834.467196] ? add_to_page_cache_locked+0x40/0x40 [ 834.472039] ? gfp_pfmemalloc_allowed+0x150/0x150 [ 834.476882] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 834.481469] read_pages.isra.0+0x329/0x5d0 [ 834.485707] ? read_cache_pages+0x750/0x750 [ 834.490080] ? alloc_pages_current+0x19b/0x2a0 [ 834.494673] __do_page_cache_readahead+0x5c6/0x6c0 [ 834.499619] ? read_pages.isra.0+0x5d0/0x5d0 [ 834.504025] ? page_cache_async_readahead+0x3a7/0x750 [ 834.509220] ondemand_readahead.isra.0+0x575/0xd40 [ 834.514153] page_cache_async_readahead+0x406/0x750 [ 834.519175] generic_file_read_iter+0x16ac/0x2b60 [ 834.524091] ? iov_iter_init+0xb8/0x1d0 [ 834.528079] __vfs_read+0x518/0x750 [ 834.531718] ? __se_sys_copy_file_range+0x410/0x410 [ 834.536750] ? kernel_fpu_enable+0x1f/0x40 [ 834.540982] ? kernel_fpu_end+0x11b/0x170 [ 834.545129] ? kernel_fpu_enable+0x40/0x40 [ 834.549370] integrity_kernel_read+0x147/0x1f0 [ 834.553953] ? integrity_inode_free+0x310/0x310 [ 834.558646] ? done_hash+0x12/0x12 [ 834.562206] ? sha256_update+0x96/0x200 [ 834.566186] ima_calc_file_hash+0x512/0x990 [ 834.570516] ? rcu_nmi_exit+0xb3/0x180 [ 834.574420] ? retint_kernel+0x2d/0x2d [ 834.578307] ? ima_alloc_tfm+0xc5/0xf0 [ 834.582197] ? ima_calc_file_hash+0x1a3/0x990 [ 834.586702] ima_collect_measurement+0x4c4/0x570 [ 834.591463] ? ima_get_action+0x90/0x90 [ 834.595442] ? ima_get_cache_status+0x1d0/0x1d0 [ 834.600121] process_measurement+0xddd/0x1440 [ 834.604622] ? ima_add_template_entry.cold+0x4d/0x4d [ 834.609726] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 834.614347] ? aa_get_task_label+0x1e6/0x7f0 [ 834.618762] ? lock_downgrade+0x720/0x720 [ 834.622907] ? check_preemption_disabled+0x41/0x280 [ 834.627942] ? check_preemption_disabled+0x41/0x280 [ 834.632962] ? aa_get_task_label+0x20d/0x7f0 [ 834.637368] ? aa_capable+0xb80/0xb80 [ 834.641171] ? do_dentry_open+0x523/0x1160 [ 834.645410] ? apparmor_task_getsecid+0x88/0xc0 [ 834.650080] ima_file_check+0xb9/0x100 [ 834.653975] ? process_measurement+0x1440/0x1440 [ 834.658749] ? inode_permission+0x3d/0x140 [ 834.662990] path_openat+0x7e4/0x2df0 [ 834.666799] ? path_lookupat+0x8d0/0x8d0 [ 834.670858] ? mark_held_locks+0xa6/0xf0 [ 834.674927] do_filp_open+0x18c/0x3f0 [ 834.678729] ? may_open_dev+0xf0/0xf0 [ 834.682534] ? lock_downgrade+0x720/0x720 [ 834.686721] ? do_raw_spin_unlock+0x171/0x230 [ 834.691235] ? _raw_spin_unlock+0x29/0x40 [ 834.695413] ? __alloc_fd+0x28d/0x570 [ 834.699225] do_sys_open+0x3b3/0x520 [ 834.702938] ? filp_open+0x70/0x70 [ 834.706478] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 834.711889] ? trace_hardirqs_off_caller+0x6e/0x210 [ 834.716907] ? do_syscall_64+0x21/0x620 [ 834.720882] do_syscall_64+0xf9/0x620 [ 834.724682] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 834.729867] RIP: 0033:0x445aa9 [ 834.733067] Code: 6d cb 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 3b cb fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 834.751967] RSP: 002b:00007ffdc5896f48 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 834.759674] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445aa9 [ 834.766940] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200000c0 [ 834.774216] RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 [ 834.781480] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 834.788742] R13: 0000000000000003 R14: 0000000000000003 R15: 0000000000000004 [ 834.796030] rcu: rcu_preempt kthread starved for 10575 jiffies! g5293 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 [ 834.806441] rcu: RCU grace-period kthread stack dump: [ 834.811624] rcu_preempt R running task 29208 10 2 0x80000000 [ 834.818836] Call Trace: [ 834.821434] __schedule+0x887/0x2040 [ 834.825156] ? io_schedule_timeout+0x140/0x140 [ 834.829747] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 834.834856] schedule+0x8d/0x1b0 [ 834.838223] schedule_timeout+0x4cf/0xfe0 [ 834.842373] ? prepare_to_swait_event+0x5b/0x540 [ 834.847133] ? usleep_range+0x170/0x170 [ 834.851105] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 834.856209] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 834.860801] ? collect_expired_timers+0x2a0/0x2a0 [ 834.865649] ? swake_up_all+0x340/0x340 [ 834.869633] rcu_gp_kthread+0xdad/0x21c0 [ 834.873710] ? lock_acquire+0x170/0x3c0 [ 834.877690] ? __rcu_read_unlock+0x160/0x160 [ 834.882104] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 834.887210] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 834.891795] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 834.896900] ? __kthread_parkme+0x133/0x1e0 [ 834.901226] ? __rcu_read_unlock+0x160/0x160 [ 834.905634] kthread+0x33f/0x460 [ 834.908999] ? kthread_park+0x180/0x180 [ 834.912972] ret_from_fork+0x24/0x30