INIT: Id "2" respawning too fast: disabled for 5 minutes INIT: Id "3" respawning too fast: disabled for 5 minutes INIT: Id "4" respawning too fast: disabled for 5 minutes INIT: Id "6" respawning too fast: disabled for 5 minutes INIT: Id "5" respawning too fast: disabled for 5 minutes [ 248.136829] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.89' (ECDSA) to the list of known hosts. [ 253.581562] random: sshd: uninitialized urandom read (32 bytes read) [ 253.670881] audit: type=1400 audit(1561208228.457:7): avc: denied { map } for pid=1824 comm="syz-executor854" path="/root/syz-executor854576017" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 358.670041] INFO: rcu_sched self-detected stall on CPU [ 358.675418] 0-...: (10499 ticks this GP) idle=29a/140000000000001/0 softirq=2446/2451 fqs=1 [ 358.684084] (t=10500 jiffies g=199 c=198 q=4) [ 358.688784] rcu_sched kthread starved for 10498 jiffies! g199 c198 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1 [ 358.698931] rcu_sched R running task 29080 9 2 0x80000000 [ 358.706151] Call Trace: [ 358.708766] ? __schedule+0x91c/0x1f30 [ 358.712669] ? __sched_text_start+0x8/0x8 [ 358.716817] ? lock_downgrade+0x5d0/0x5d0 [ 358.721053] schedule+0x92/0x1c0 [ 358.724425] schedule_timeout+0x4d7/0xe80 [ 358.728586] ? usleep_range+0x150/0x150 [ 358.732565] ? _raw_spin_unlock_irqrestore+0x54/0x70 [ 358.737678] ? trace_hardirqs_on_caller+0x37b/0x540 [ 358.742720] ? run_timer_softirq+0x5d0/0x5d0 [ 358.747160] rcu_gp_kthread+0xc52/0x1f00 [ 358.751271] ? force_qs_rnp+0x4f0/0x4f0 [ 358.755258] ? kthread_flush_work_fn+0x20/0x20 [ 358.759851] ? force_qs_rnp+0x4f0/0x4f0 [ 358.763830] kthread+0x310/0x420 [ 358.767210] ? kthread_create_on_node+0xf0/0xf0 [ 358.771895] ret_from_fork+0x3a/0x50 [ 358.775683] NMI backtrace for cpu 0 [ 358.779410] CPU: 0 PID: 1832 Comm: syz-executor854 Not tainted 4.14.128+ #10 [ 358.786597] Call Trace: [ 358.789185] [ 358.791348] dump_stack+0xb9/0x10e [ 358.794894] ? irq_force_complete_move.cold+0x5c/0x7b [ 358.800098] nmi_cpu_backtrace.cold+0x47/0x86 [ 358.804607] ? irq_force_complete_move.cold+0x7b/0x7b [ 358.809812] ? nmi_trigger_cpumask_backtrace+0x119/0x147 [ 358.815278] ? rcu_dump_cpu_stacks+0x16d/0x1b8 [ 358.819883] ? rcu_check_callbacks.cold+0x489/0xdb2 [ 358.824962] ? rcu_lockdep_current_cpu_online+0x27/0x140 [ 358.830437] ? __raise_softirq_irqoff+0x63/0x1b0 [ 358.835223] ? update_process_times+0x24/0x60 [ 358.839766] ? tick_sched_handle.isra.0+0x73/0x150 [ 358.844712] ? tick_sched_timer+0x7e/0x170 [ 358.848958] ? tick_sched_handle.isra.0+0x150/0x150 [ 358.853993] ? __hrtimer_run_queues+0x269/0xc10 [ 358.858680] ? hrtimer_start_range_ns+0x1080/0x1080 [ 358.863712] ? ktime_get_update_offsets_now+0x207/0x2f0 [ 358.869106] ? hrtimer_interrupt+0x1bd/0x490 [ 358.873575] ? smp_apic_timer_interrupt+0x136/0x620 [ 358.878615] ? apic_timer_interrupt+0x84/0x90 [ 358.883120] [ 358.885387] ? audit_add_tree_rule.cold+0x2f/0x2f [ 358.890245] ? ext4_mark_iloc_dirty+0x142e/0x2880 [ 358.895113] ? ext4_chunk_trans_blocks+0x30/0x30 [ 358.899882] ? __ext4_journal_get_write_access+0x55/0x90 [ 358.905355] ? ext4_mark_inode_dirty+0x1d6/0x7e0 [ 358.910122] ? ext4_expand_extra_isize+0x500/0x500 [ 358.915068] ? ext4_dirty_inode+0x51/0x90 [ 358.919220] ? ext4_journal_check_start+0x13d/0x1e0 [ 358.924252] ? __ext4_journal_start_sb+0x10f/0x480 [ 358.929205] ? ext4_dirty_inode+0x6c/0x90 [ 358.933367] ? ext4_setattr+0x2280/0x2280 [ 358.937527] ? __mark_inode_dirty+0x108/0x1030 [ 358.942122] ? block_write_end+0x42/0xf0 [ 358.946206] ? generic_write_end+0x188/0x250 [ 358.950632] ? ext4_da_write_end+0x450/0xc00 [ 358.955067] ? generic_perform_write+0x26d/0x450 [ 358.959846] ? filemap_page_mkwrite+0x2d0/0x2d0 [ 358.964530] ? current_time+0xb0/0xb0 [ 358.968347] ? lock_acquire+0x10f/0x380 [ 358.972343] ? __generic_file_write_iter+0x32e/0x550 [ 358.977460] ? generic_write_checks+0x252/0x410 [ 358.982153] ? ext4_file_write_iter+0x551/0xd60 [ 358.986859] ? ext4_llseek+0x7f0/0x7f0 [ 358.990762] ? kasan_kmalloc.part.0+0xa6/0xd0 [ 358.995275] ? kasan_kmalloc.part.0+0x4f/0xd0 [ 358.999779] ? __kmalloc+0x143/0x340 [ 359.003505] ? iter_file_splice_write+0x156/0xa50 [ 359.008363] ? direct_splice_actor+0x118/0x160 [ 359.012960] ? splice_direct_to_actor+0x292/0x760 [ 359.017822] ? do_splice_direct+0x177/0x240 [ 359.022151] ? do_sendfile+0x493/0xb20 [ 359.026064] ? do_iter_readv_writev+0x379/0x580 [ 359.030747] ? clone_verify_area+0x1e0/0x1e0 [ 359.035177] ? avc_policy_seqno+0x5/0x10 [ 359.039251] ? security_file_permission+0x88/0x1e0 [ 359.044206] ? do_iter_write+0x152/0x550 [ 359.048279] ? kasan_unpoison_shadow+0x30/0x40 [ 359.053058] ? kasan_kmalloc+0x76/0xc0 [ 359.056958] ? vfs_iter_write+0x70/0xa0 [ 359.060944] ? iter_file_splice_write+0x560/0xa50 [ 359.065817] ? generic_file_splice_read+0x377/0x540 [ 359.070857] ? vmsplice_to_user+0x1e0/0x1e0 [ 359.075198] ? add_to_pipe+0x350/0x350 [ 359.079106] ? __inode_security_revalidate+0xcf/0x120 [ 359.084324] ? security_file_permission+0x88/0x1e0 [ 359.089272] ? vmsplice_to_user+0x1e0/0x1e0 [ 359.093603] ? direct_splice_actor+0x118/0x160 [ 359.098208] ? splice_direct_to_actor+0x292/0x760 [ 359.103069] ? generic_pipe_buf_nosteal+0x10/0x10 [ 359.107928] ? do_splice_to+0x150/0x150 [ 359.111909] ? security_file_permission+0x88/0x1e0 [ 359.116857] ? do_splice_direct+0x177/0x240 [ 359.121275] ? splice_direct_to_actor+0x760/0x760 [ 359.126143] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 359.131621] ? rcu_read_lock_sched_held+0x10a/0x130 [ 359.136652] ? do_sendfile+0x493/0xb20 [ 359.140559] ? do_compat_pwritev64+0x170/0x170 [ 359.145245] ? __might_fault+0x177/0x1b0 [ 359.149326] ? SyS_sendfile64+0xab/0x140 [ 359.153395] ? SyS_sendfile+0x150/0x150 [ 359.157380] ? do_syscall_64+0x43/0x510 [ 359.161365] ? SyS_sendfile+0x150/0x150 [ 359.165344] ? do_syscall_64+0x19b/0x510 [ 359.169413] ? entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 359.174981] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 359.180795] (detected by 0, t=10548 jiffies, g=377, c=376, q=99) [ 359.187073] All QSes seen, last rcu_preempt kthread activity 10548 (4294973213-4294962665), jiffies_till_next_fqs=1, root ->qsmask 0x0 [ 359.199304] syz-executor854 R running task 26872 1832 1828 0x00000008 [ 359.206521] Call Trace: [ 359.209106] [ 359.211269] sched_show_task.cold+0x342/0x3c0 [ 359.215777] ? rcu_check_callbacks.cold+0xd44/0xdb2 [ 359.220842] ? update_process_times+0x24/0x60 [ 359.225352] ? tick_sched_handle.isra.0+0x73/0x150 [ 359.230296] ? tick_sched_timer+0x7e/0x170 [ 359.234526] ? tick_sched_handle.isra.0+0x150/0x150 [ 359.239560] ? __hrtimer_run_queues+0x269/0xc10 [ 359.244259] ? hrtimer_start_range_ns+0x1080/0x1080 [ 359.249296] ? ktime_get_update_offsets_now+0x207/0x2f0 [ 359.254688] ? hrtimer_interrupt+0x1bd/0x490 [ 359.259122] ? smp_apic_timer_interrupt+0x136/0x620 [ 359.264147] ? apic_timer_interrupt+0x84/0x90 [ 359.268647] [ 359.270907] ? audit_add_tree_rule.cold+0x2f/0x2f [ 359.275766] ? ext4_mark_iloc_dirty+0x142e/0x2880 [ 359.280624] ? ext4_chunk_trans_blocks+0x30/0x30 [ 359.285389] ? __ext4_journal_get_write_access+0x55/0x90 [ 359.290859] ? ext4_mark_inode_dirty+0x1d6/0x7e0 [ 359.295633] ? ext4_expand_extra_isize+0x500/0x500 [ 359.300582] ? ext4_dirty_inode+0x51/0x90 [ 359.304737] ? ext4_journal_check_start+0x13d/0x1e0 [ 359.309765] ? __ext4_journal_start_sb+0x10f/0x480 [ 359.314706] ? ext4_dirty_inode+0x6c/0x90 [ 359.318859] ? ext4_setattr+0x2280/0x2280 [ 359.323015] ? __mark_inode_dirty+0x108/0x1030 [ 359.327607] ? block_write_end+0x42/0xf0 [ 359.331674] ? generic_write_end+0x188/0x250 [ 359.336100] ? ext4_da_write_end+0x450/0xc00 [ 359.340522] ? generic_perform_write+0x26d/0x450 [ 359.345296] ? filemap_page_mkwrite+0x2d0/0x2d0 [ 359.349970] ? current_time+0xb0/0xb0 [ 359.353782] ? lock_acquire+0x10f/0x380 [ 359.357766] ? __generic_file_write_iter+0x32e/0x550 [ 359.362870] ? generic_write_checks+0x252/0x410 [ 359.367553] ? ext4_file_write_iter+0x551/0xd60 [ 359.372234] ? ext4_llseek+0x7f0/0x7f0 [ 359.376133] ? kasan_kmalloc.part.0+0xa6/0xd0 [ 359.380642] ? kasan_kmalloc.part.0+0x4f/0xd0 [ 359.385143] ? __kmalloc+0x143/0x340 [ 359.388863] ? iter_file_splice_write+0x156/0xa50 [ 359.393716] ? direct_splice_actor+0x118/0x160 [ 359.398306] ? splice_direct_to_actor+0x292/0x760 [ 359.403148] ? do_splice_direct+0x177/0x240 [ 359.407480] ? do_sendfile+0x493/0xb20 [ 359.411379] ? do_iter_readv_writev+0x379/0x580 [ 359.416057] ? clone_verify_area+0x1e0/0x1e0 [ 359.420471] ? avc_policy_seqno+0x5/0x10 [ 359.424547] ? security_file_permission+0x88/0x1e0 [ 359.429490] ? do_iter_write+0x152/0x550 [ 359.433559] ? kasan_unpoison_shadow+0x30/0x40 [ 359.438156] ? kasan_kmalloc+0x76/0xc0 [ 359.442062] ? vfs_iter_write+0x70/0xa0 [ 359.446053] ? iter_file_splice_write+0x560/0xa50 [ 359.450921] ? generic_file_splice_read+0x377/0x540 [ 359.455950] ? vmsplice_to_user+0x1e0/0x1e0 [ 359.460282] ? add_to_pipe+0x350/0x350 [ 359.464209] ? __inode_security_revalidate+0xcf/0x120 [ 359.469417] ? security_file_permission+0x88/0x1e0 [ 359.474360] ? vmsplice_to_user+0x1e0/0x1e0 [ 359.478685] ? direct_splice_actor+0x118/0x160 [ 359.483284] ? splice_direct_to_actor+0x292/0x760 [ 359.488138] ? generic_pipe_buf_nosteal+0x10/0x10 [ 359.492998] ? do_splice_to+0x150/0x150 [ 359.496976] ? security_file_permission+0x88/0x1e0 [ 359.501925] ? do_splice_direct+0x177/0x240 [ 359.506260] ? splice_direct_to_actor+0x760/0x760 [ 359.511124] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 359.516590] ? rcu_read_lock_sched_held+0x10a/0x130 [ 359.521622] ? do_sendfile+0x493/0xb20 [ 359.525520] ? do_compat_pwritev64+0x170/0x170 [ 359.530116] ? __might_fault+0x177/0x1b0 [ 359.534195] ? SyS_sendfile64+0xab/0x140 [ 359.538259] ? SyS_sendfile+0x150/0x150 [ 359.542238] ? do_syscall_64+0x43/0x510 [ 359.546214] ? SyS_sendfile+0x150/0x150 [ 359.550202] ? do_syscall_64+0x19b/0x510 [ 359.554278] ? entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 359.559667] rcu_preempt kthread starved for 10548 jiffies! g377 c376 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1 [ 359.569982] rcu_preempt R running task 29080 8 2 0x80000000 [ 359.577200] Call Trace: [ 359.579799] ? __schedule+0x91c/0x1f30 [ 359.583700] ? __sched_text_start+0x8/0x8 [ 359.587851] ? lock_downgrade+0x5d0/0x5d0 [ 359.592020] schedule+0x92/0x1c0 [ 359.595388] schedule_timeout+0x4d7/0xe80 [ 359.599544] ? usleep_range+0x150/0x150 [ 359.603519] ? _raw_spin_unlock_irqrestore+0x54/0x70 [ 359.608633] ? trace_hardirqs_on_caller+0x37b/0x540 [ 359.613657] ? run_timer_softirq+0x5d0/0x5d0 [ 359.618096] rcu_gp_kthread+0xc52/0x1f00 [ 359.622205] ? force_qs_rnp+0x4f0/0x4f0 [ 359.626200] ? kthread_flush_work_fn+0x20/0x20 [ 359.630794] ? force_qs_rnp+0x4f0/0x4f0 [ 359.634777] kthread+0x310/0x420 [ 359.638150] ? kthread_create_on_node+0xf0/0xf0 [ 359.642838] ret_from_fork+0x3a/0x50