[ 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 '10.128.0.2' (ECDSA) to the list of known hosts. syzkaller login: [ 309.162367] audit: type=1400 audit(1592062617.653:8): avc: denied { execmem } for pid=6352 comm="syz-executor934" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 309.230056] hrtimer: interrupt took 42564 ns [ 309.230059] hrtimer: interrupt took 40505 ns [ 414.224134] INFO: rcu_sched detected stalls on CPUs/tasks: [ 414.224137] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 414.235770] [ 414.235771] (detected by 0, t=10502 jiffies, g=329, c=328, q=0) [ 414.237466] (detected by 1, t=10502 jiffies, g=1103, c=1102, q=2) [ 414.243588] All QSes seen, last rcu_sched kthread activity 10502 (4294978725-4294968223), jiffies_till_next_fqs=1, root ->qsmask 0x0 [ 414.249788] All QSes seen, last rcu_preempt kthread activity 10502 (4294978725-4294968223), jiffies_till_next_fqs=1, root ->qsmask 0x0 [ 414.261810] syz-executor934 R [ 414.274000] syz-executor934 R [ 414.274005] running task [ 414.277080] running task [ 414.280170] 26848 6364 6353 0x00000000 [ 414.283332] 26528 6362 6357 0x00000000 [ 414.286545] Call Trace: [ 414.290613] Call Trace: [ 414.294777] [ 414.297291] [ 414.299929] sched_show_task.cold+0x335/0x399 [ 414.301978] sched_show_task.cold+0x335/0x399 [ 414.304159] rcu_check_callbacks.cold+0xd3f/0xdaa [ 414.308573] rcu_check_callbacks.cold+0xd3f/0xdaa [ 414.313087] update_process_times+0x29/0x60 [ 414.317882] update_process_times+0x29/0x60 [ 414.322724] tick_sched_handle.isra.0+0x73/0x150 [ 414.326994] tick_sched_handle.isra.0+0x73/0x150 [ 414.331288] tick_sched_timer+0x41/0x120 [ 414.336016] tick_sched_timer+0x41/0x120 [ 414.340757] __hrtimer_run_queues+0x24b/0xb90 [ 414.344789] __hrtimer_run_queues+0x24b/0xb90 [ 414.348821] ? tick_sched_handle.isra.0+0x150/0x150 [ 414.353287] ? tick_sched_handle.isra.0+0x150/0x150 [ 414.357758] ? enqueue_hrtimer+0x3a0/0x3a0 [ 414.362747] ? enqueue_hrtimer+0x3a0/0x3a0 [ 414.367737] hrtimer_interrupt+0x1e6/0x5e0 [ 414.371943] hrtimer_interrupt+0x1e6/0x5e0 [ 414.376551] smp_apic_timer_interrupt+0x117/0x5f0 [ 414.380637] smp_apic_timer_interrupt+0x117/0x5f0 [ 414.384842] apic_timer_interrupt+0x93/0xa0 [ 414.389673] apic_timer_interrupt+0x93/0xa0 [ 414.394482] [ 414.398773] [ 414.403192] RIP: 0010:lock_release+0x41e/0x7f0 [ 414.405433] RIP: 0010:find_get_entry+0x2eb/0x660 [ 414.407578] RSP: 0018:ffff8880a9eb7870 EFLAGS: 00000282 [ 414.412133] RSP: 0018:ffff88809b16f4c8 EFLAGS: 00000246 [ 414.416863] ORIG_RAX: ffffffffffffff10 [ 414.422283] ORIG_RAX: ffffffffffffff10 [ 414.427620] RAX: 1ffffffff0f62cd1 RBX: 1ffff110153d6f12 RCX: 1ffff11010c2252f [ 414.431564] RAX: 1ffff11012beaeeb RBX: ffffea0001fdcf80 RCX: 0000000000000000 [ 414.435510] RDX: dffffc0000000000 RSI: 0000000000000002 RDI: 0000000000000282 [ 414.442892] RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000282 [ 414.442900] RBP: ffffea0001fdcf80 R08: 0000000000000000 R09: 0000000000020012 [ 414.450166] RBP: ffff888086112100 R08: 0000000000000001 R09: 0000000000000001 [ 414.457413] R10: ffff888097e26958 R11: ffff888097e26080 R12: ffff888095f57758 [ 414.464673] R10: ffff8880861129b0 R11: ffff888086112100 R12: ffffffff816d515b [ 414.472262] R13: dffffc0000000000 R14: ffffea0001fdcfa0 R15: ffffea0001fdcf80 [ 414.472291] ? find_get_entry+0x2df/0x660 [ 414.479528] R13: 0000000000000003 R14: ffff888086112100 R15: 0000000000000002 [ 414.487143] pagecache_get_page+0x44/0xa10 [ 414.494664] ? find_get_entry+0x31b/0x660 [ 414.501915] grab_cache_page_write_begin+0x63/0x90 [ 414.506318] ? lock_downgrade+0x6e0/0x6e0 [ 414.514137] ext4_da_write_begin+0x244/0xe50 [ 414.522384] find_get_entry+0x342/0x660 [ 414.526527] ? ext4_write_begin+0x1240/0x1240 [ 414.531609] pagecache_get_page+0x44/0xa10 [ 414.535754] generic_perform_write+0x1c9/0x420 [ 414.540607] generic_file_read_iter+0x564/0x21d0 [ 414.544558] ? filemap_page_mkwrite+0x2d0/0x2d0 [ 414.549097] ext4_file_read_iter+0x14b/0x330 [ 414.553531] ? current_time+0xb0/0xb0 [ 414.558133] generic_file_splice_read+0x374/0x5d0 [ 414.562825] __generic_file_write_iter+0x227/0x590 [ 414.567463] ? add_to_pipe+0x350/0x350 [ 414.571844] ext4_file_write_iter+0x279/0xd90 [ 414.575654] ? avc_policy_seqno+0x5/0x10 [ 414.580434] ? ext4_llseek+0x7c0/0x7c0 [ 414.585337] ? selinux_file_permission+0x7a/0x440 [ 414.589262] do_iter_readv_writev+0x3df/0x600 [ 414.593684] ? rw_verify_area+0xe1/0x290 [ 414.597789] ? clone_verify_area+0x1e0/0x1e0 [ 414.601666] ? add_to_pipe+0x350/0x350 [ 414.606484] ? rw_verify_area+0xe1/0x290 [ 414.610953] do_splice_to+0xfb/0x150 [ 414.615127] do_iter_write+0x152/0x550 [ 414.619550] ? direct_splice_actor+0x115/0x160 [ 414.623768] vfs_iter_write+0x70/0xa0 [ 414.627802] splice_direct_to_actor+0x20a/0x730 [ 414.631488] iter_file_splice_write+0x52e/0xa10 [ 414.635452] ? generic_pipe_buf_nosteal+0x10/0x10 [ 414.640012] ? generic_file_splice_read+0x3de/0x5d0 [ 414.643806] ? do_splice_to+0x150/0x150 [ 414.648463] ? vmsplice_to_user+0x1c0/0x1c0 [ 414.653110] ? rw_verify_area+0xe1/0x290 [ 414.657927] ? add_to_pipe+0x350/0x350 [ 414.662929] do_splice_direct+0x164/0x210 [ 414.666879] ? avc_policy_seqno+0x5/0x10 [ 414.671191] ? splice_direct_to_actor+0x730/0x730 [ 414.675248] ? selinux_file_permission+0x7a/0x440 [ 414.679113] ? rcu_read_lock_sched_held+0x10a/0x130 [ 414.683272] ? rw_verify_area+0xe1/0x290 [ 414.687305] ? rcu_sync_lockdep_assert+0x69/0xa0 [ 414.692240] ? vmsplice_to_user+0x1c0/0x1c0 [ 414.697199] do_sendfile+0x469/0xaf0 [ 414.702199] direct_splice_actor+0x115/0x160 [ 414.706244] ? do_compat_pwritev64+0x140/0x140 [ 414.710981] splice_direct_to_actor+0x27e/0x730 [ 414.715283] SyS_sendfile64+0x9b/0x110 [ 414.719056] ? generic_pipe_buf_nosteal+0x10/0x10 [ 414.723457] ? SyS_sendfile+0x130/0x130 [ 414.728024] ? do_splice_to+0x150/0x150 [ 414.732680] ? do_syscall_64+0x4c/0x640 [ 414.736546] ? rw_verify_area+0xe1/0x290 [ 414.741376] ? SyS_sendfile+0x130/0x130 [ 414.745326] do_splice_direct+0x164/0x210 [ 414.749274] do_syscall_64+0x1d5/0x640 [ 414.753485] ? splice_direct_to_actor+0x730/0x730 [ 414.757625] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 414.761593] ? rcu_read_lock_sched_held+0x10a/0x130 [ 414.765711] RIP: 0033:0x4418a9 [ 414.769598] ? rcu_sync_lockdep_assert+0x69/0xa0 [ 414.774426] RSP: 002b:00007ffe99a10118 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 [ 414.782741] do_sendfile+0x469/0xaf0 [ 414.787730] RAX: ffffffffffffffda RBX: 00007ffe99a102c0 RCX: 00000000004418a9 [ 414.790901] ? do_compat_pwritev64+0x140/0x140 [ 414.795623] RDX: 00000000200001c0 RSI: 0000000000000003 RDI: 0000000000000003 [ 414.803312] SyS_sendfile64+0x9b/0x110 [ 414.807002] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 414.814251] ? SyS_sendfile+0x130/0x130 [ 414.818825] R10: 00008080fffffffe R11: 0000000000000246 R12: 0000000000000000 [ 414.826771] ? do_syscall_64+0x4c/0x640 [ 414.831875] R13: 0000000000402580 R14: 0000000000000000 R15: 0000000000000000 [ 414.831896] rcu_sched kthread starved for 10502 jiffies! g329 c328 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1 [ 414.839312] ? SyS_sendfile+0x130/0x130 [ 414.843279] rcu_sched R [ 414.850642] do_syscall_64+0x1d5/0x640 [ 414.854584] running task [ 414.861942] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 414.872056] 29904 9 2 0x80000000 [ 414.876299] RIP: 0033:0x4418a9 [ 414.879464] Call Trace: [ 414.883347] RSP: 002b:00007ffe99a10118 EFLAGS: 00000246 [ 414.886585] __schedule+0x8a6/0x1d70 [ 414.891681] ORIG_RAX: 0000000000000028 [ 414.895810] ? schedule_timeout+0x4d5/0xe50 [ 414.898988] RAX: ffffffffffffffda RBX: 00007ffe99a102c0 RCX: 00000000004418a9 [ 414.901554] ? firmware_map_remove+0x18f/0x18f [ 414.906911] RDX: 00000000200001c0 RSI: 0000000000000003 RDI: 0000000000000003 [ 414.910606] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 414.914985] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 414.919299] schedule+0x8d/0x1b0 [ 414.926543] R10: 00008080fffffffe R11: 0000000000000246 R12: 0000000000000000 [ 414.931115] schedule_timeout+0x4df/0xe50 [ 414.938370] R13: 0000000000402580 R14: 0000000000000000 R15: 0000000000000000 [ 414.938390] rcu_preempt kthread starved for 10502 jiffies! g1103 c1102 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1 [ 414.943464] ? usleep_range+0x130/0x130 [ 414.950703] rcu_preempt R [ 414.954066] ? trace_hardirqs_on_caller+0x3a8/0x580 [ 414.961304] running task 29904 8 2 0x80000000 [ 414.965436] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 414.972690] Call Trace: [ 414.983172] ? run_timer_softirq+0x5b0/0x5b0 [ 414.987125] __schedule+0x8a6/0x1d70 [ 414.990207] rcu_gp_kthread+0xb3d/0x1ce0 [ 414.995207] ? schedule_timeout+0x4d5/0xe50 [ 415.000908] ? force_qs_rnp+0x4f0/0x4f0 [ 415.005976] ? firmware_map_remove+0x18f/0x18f [ 415.008548] ? force_qs_rnp+0x4f0/0x4f0 [ 415.012936] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 415.016624] kthread+0x30d/0x420 [ 415.020677] schedule+0x8d/0x1b0 [ 415.025584] ? kthread_create_on_node+0xd0/0xd0 [ 415.029530] schedule_timeout+0x4df/0xe50 [ 415.034087] ret_from_fork+0x24/0x30 [ 415.038039] ? usleep_range+0x130/0x130 [ 415.066346] ? trace_hardirqs_on_caller+0x3a8/0x580 [ 415.071359] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 415.076479] ? run_timer_softirq+0x5b0/0x5b0 [ 415.081149] rcu_gp_kthread+0xb3d/0x1ce0 [ 415.085289] ? force_qs_rnp+0x4f0/0x4f0 [ 415.089361] ? force_qs_rnp+0x4f0/0x4f0 [ 415.093425] kthread+0x30d/0x420 [ 415.096787] ? kthread_create_on_node+0xd0/0xd0 [ 415.101453] ret_from_fork+0x24/0x30