[ 88.012602][ T27] audit: type=1800 audit(1579891817.534:26): pid=9421 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 88.982701][ T27] kauditd_printk_skb: 2 callbacks suppressed [ 88.982712][ T27] audit: type=1800 audit(1579891818.524:29): pid=9421 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 89.009734][ T27] audit: type=1800 audit(1579891818.524:30): pid=9421 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.42' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 1114.390566][ C0] hrtimer: interrupt took 41724 ns [ 1219.398984][ C0] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: [ 1219.406105][ C0] (detected by 0, t=10502 jiffies, g=9509, q=0) [ 1219.412452][ C0] rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4295059083-4295048580), jiffies_till_next_fqs=1, root ->qsmask 0x0 [ 1219.425817][ C0] syz-executor914 R running task 25720 9581 9578 0x00004000 [ 1219.433854][ C0] Call Trace: [ 1219.437154][ C0] <IRQ> [ 1219.440138][ C0] sched_show_task.cold+0x2ee/0x35d [ 1219.445376][ C0] ? can_nice.part.0+0x20/0x20 [ 1219.450238][ C0] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 1219.456072][ C0] rcu_sched_clock_irq.cold+0xaf4/0xc0d [ 1219.461702][ C0] update_process_times+0x2d/0x70 [ 1219.466915][ C0] tick_sched_handle+0xa2/0x190 [ 1219.471781][ C0] tick_sched_timer+0x53/0x140 [ 1219.476556][ C0] __hrtimer_run_queues+0x364/0xe40 [ 1219.481880][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 1219.487194][ C0] ? hrtimer_init+0x330/0x330 [ 1219.491899][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 1219.497646][ C0] ? ktime_get_update_offsets_now+0x2ce/0x430 [ 1219.503735][ C0] hrtimer_interrupt+0x314/0x770 [ 1219.508878][ C0] smp_apic_timer_interrupt+0x160/0x610 [ 1219.514463][ C0] apic_timer_interrupt+0xf/0x20 [ 1219.519411][ C0] </IRQ> [ 1219.522422][ C0] RIP: 0010:unwind_next_frame.part.0+0x0/0xa20 [ 1219.528592][ C0] Code: 00 00 48 8b 45 d0 65 48 33 04 25 28 00 00 00 75 12 48 81 c4 e0 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 02 77 12 00 66 90 <55> 4c 8d 4f 58 48 b8 00 00 00 00 00 fc ff df 48 89 e5 41 57 41 56 [ 1219.548205][ C0] RSP: 0018:ffffc900020d74f0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 1219.556645][ C0] RAX: 0000000000000000 RBX: ffffffff8163c730 RCX: ffffffff8163c852 [ 1219.564632][ C0] RDX: 0000000000000001 RSI: ffffffff8163c85e RDI: ffffc900020d7510 [ 1219.572619][ C0] RBP: ffffc900020d7500 R08: ffff888097218040 R09: ffffc900020d7568 [ 1219.580599][ C0] R10: ffffc900020d7538 R11: ffffc900020d7548 R12: ffffc900020d75c8 [ 1219.588582][ C0] R13: 0000000000000000 R14: ffff888097218040 R15: ffff8880aa4008c0 [ 1219.596578][ C0] ? profile_setup.cold+0xbb/0xbb [ 1219.601607][ C0] ? stack_trace_consume_entry+0x122/0x190 [ 1219.607530][ C0] ? stack_trace_consume_entry+0x12e/0x190 [ 1219.613351][ C0] ? unwind_next_frame+0x3b/0x50 [ 1219.618335][ C0] arch_stack_walk+0x81/0xf0 [ 1219.623041][ C0] ? iter_file_splice_write+0x16e/0xc10 [ 1219.628613][ C0] stack_trace_save+0xac/0xe0 [ 1219.633310][ C0] ? stack_trace_consume_entry+0x190/0x190 [ 1219.639125][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 1219.645038][ C0] ? __kasan_check_read+0x11/0x20 [ 1219.650111][ C0] ? mark_lock+0xc2/0x1220 [ 1219.654535][ C0] save_stack+0x23/0x90 [ 1219.658711][ C0] ? save_stack+0x23/0x90 [ 1219.663053][ C0] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 1219.668861][ C0] ? kasan_slab_alloc+0xf/0x20 [ 1219.673695][ C0] ? __kmalloc+0x14c/0x770 [ 1219.678159][ C0] ? iter_file_splice_write+0x16e/0xc10 [ 1219.683721][ C0] ? __kasan_check_read+0x11/0x20 [ 1219.688756][ C0] ? mark_held_locks+0xa4/0xf0 [ 1219.693573][ C0] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 1219.699042][ C0] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 1219.704503][ C0] ? lockdep_hardirqs_on+0x421/0x5e0 [ 1219.709800][ C0] ? retint_kernel+0x2b/0x2b [ 1219.714449][ C0] ? trace_hardirqs_on_caller+0x6a/0x240 [ 1219.720126][ C0] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 1219.725676][ C0] ? __this_cpu_preempt_check+0x8a/0x190 [ 1219.731317][ C0] ? __this_cpu_preempt_check+0x35/0x190 [ 1219.736970][ C0] ? retint_kernel+0x2b/0x2b [ 1219.741580][ C0] ? kasan_unpoison_shadow+0x35/0x50 [ 1219.746881][ C0] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 1219.752532][ C0] kasan_slab_alloc+0xf/0x20 [ 1219.757130][ C0] __kmalloc+0x14c/0x770 [ 1219.761385][ C0] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 1219.767150][ C0] ? atime_needs_update+0x491/0x5f0 [ 1219.772367][ C0] ? iter_file_splice_write+0x16e/0xc10 [ 1219.777924][ C0] iter_file_splice_write+0x16e/0xc10 [ 1219.783406][ C0] ? ext4_file_read_iter+0x1e3/0x640 [ 1219.788737][ C0] ? generic_file_splice_read+0x537/0x800 [ 1219.794477][ C0] ? page_cache_pipe_buf_release+0x290/0x290 [ 1219.800467][ C0] ? add_to_pipe+0x3b0/0x3b0 [ 1219.805133][ C0] ? rw_verify_area+0x126/0x360 [ 1219.810004][ C0] ? page_cache_pipe_buf_release+0x290/0x290 [ 1219.816007][ C0] direct_splice_actor+0x123/0x190 [ 1219.821139][ C0] splice_direct_to_actor+0x3b4/0xa30 [ 1219.826532][ C0] ? generic_pipe_buf_nosteal+0x10/0x10 [ 1219.832095][ C0] ? do_splice_to+0x180/0x180 [ 1219.836804][ C0] ? rw_verify_area+0x126/0x360 [ 1219.841670][ C0] do_splice_direct+0x1da/0x2a0 [ 1219.846560][ C0] ? splice_direct_to_actor+0xa30/0xa30 [ 1219.852116][ C0] ? rcu_read_lock_any_held+0xcd/0xf0 [ 1219.857576][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 1219.863827][ C0] ? __this_cpu_preempt_check+0x35/0x190 [ 1219.869476][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 1219.875731][ C0] ? __sb_start_write+0x1e5/0x460 [ 1219.880767][ C0] do_sendfile+0x597/0xd00 [ 1219.885219][ C0] ? do_compat_pwritev64+0x1c0/0x1c0 [ 1219.890517][ C0] ? __x64_sys_sendfile64+0xfc/0x220 [ 1219.895816][ C0] __x64_sys_sendfile64+0x1dd/0x220 [ 1219.901022][ C0] ? __ia32_sys_sendfile+0x230/0x230 [ 1219.906319][ C0] ? do_syscall_64+0x26/0x790 [ 1219.911011][ C0] ? lockdep_hardirqs_on+0x421/0x5e0 [ 1219.916390][ C0] ? trace_hardirqs_on+0x67/0x240 [ 1219.921460][ C0] do_syscall_64+0xfa/0x790 [ 1219.925973][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1219.931871][ C0] RIP: 0033:0x441a09 [ 1219.935788][ C0] Code: e8 7c e7 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 bb 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 1219.955402][ C0] RSP: 002b:00007ffc00736e88 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 [ 1219.963838][ C0] RAX: ffffffffffffffda RBX: 00007ffc00737030 RCX: 0000000000441a09 [ 1219.971827][ C0] RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004 [ 1219.979823][ C0] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 1219.987799][ C0] R10: 00008000fffffffe R11: 0000000000000246 R12: 0000000000000000 [ 1219.995778][ C0] R13: 00000000004026e0 R14: 0000000000000000 R15: 0000000000000000 [ 1220.003790][ C0] rcu: rcu_preempt kthread starved for 10562 jiffies! g9509 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 [ 1220.015000][ C0] rcu: RCU grace-period kthread stack dump: [ 1220.020924][ C0] rcu_preempt R running task 29264 10 2 0x80004000 [ 1220.028840][ C0] Call Trace: [ 1220.032180][ C0] __schedule+0x934/0x1f90 [ 1220.036624][ C0] ? __sched_text_start+0x8/0x8 [ 1220.041509][ C0] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 1220.047323][ C0] ? schedule_timeout+0x47c/0xc50 [ 1220.052366][ C0] ? lockdep_hardirqs_on+0x421/0x5e0 [ 1220.057666][ C0] schedule+0xdc/0x2b0 [ 1220.062099][ C0] schedule_timeout+0x486/0xc50 [ 1220.066958][ C0] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 1220.072804][ C0] ? usleep_range+0x170/0x170 [ 1220.077497][ C0] ? trace_hardirqs_on+0x67/0x240 [ 1220.082550][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 1220.088192][ C0] ? swake_up_one+0x60/0x60 [ 1220.092719][ C0] rcu_gp_kthread+0x9b2/0x18d0 [ 1220.097511][ C0] ? rcu_barrier+0x350/0x350 [ 1220.102120][ C0] ? trace_hardirqs_on+0x67/0x240 [ 1220.107185][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 1220.113531][ C0] ? __kthread_parkme+0x108/0x1c0 [ 1220.118584][ C0] ? __kasan_check_read+0x11/0x20 [ 1220.123617][ C0] kthread+0x361/0x430 [ 1220.127703][ C0] ? rcu_barrier+0x350/0x350 [ 1220.132310][ C0] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 1220.138040][ C0] ret_from_fork+0x24/0x30