[ 93.354703][ T27] audit: type=1800 audit(1579936633.920:24): pid=9581 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="sudo" dev="sda1" ino=2454 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 93.931279][ T27] audit: type=1800 audit(1579936634.610:25): pid=9581 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 93.951683][ T27] audit: type=1800 audit(1579936634.620:26): pid=9581 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[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.249' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 336.736419][ T9736] Set syz2 is full, maxelem 65536 reached [ 441.754612][ C1] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: [ 441.761627][ C1] (detected by 1, t=10502 jiffies, g=9453, q=929) [ 441.768152][ C1] rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294981303-4294970801), jiffies_till_next_fqs=1, root ->qsmask 0x0 [ 441.781868][ C1] syz-executor596 R running task 28776 9738 9733 0x20020008 [ 441.790130][ C1] Call Trace: [ 441.793433][ C1] [ 441.796431][ C1] sched_show_task.cold+0x2ee/0x35d [ 441.801654][ C1] ? can_nice.part.0+0x20/0x20 [ 441.806521][ C1] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 441.812844][ C1] rcu_sched_clock_irq.cold+0xaf4/0xc0d [ 441.818517][ C1] update_process_times+0x2d/0x70 [ 441.823643][ C1] tick_sched_handle+0xa2/0x190 [ 441.828550][ C1] tick_sched_timer+0x53/0x140 [ 441.833366][ C1] __hrtimer_run_queues+0x364/0xe40 [ 441.838734][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 441.844045][ C1] ? hrtimer_init+0x330/0x330 [ 441.848744][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 441.854481][ C1] ? ktime_get_update_offsets_now+0x2ce/0x430 [ 441.860704][ C1] hrtimer_interrupt+0x314/0x770 [ 441.865740][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 441.871316][ C1] apic_timer_interrupt+0xf/0x20 [ 441.876293][ C1] RIP: 0010:native_safe_halt+0xe/0x10 [ 441.882580][ C1] Code: 18 77 de f9 eb 8a cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d c4 31 54 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d b4 31 54 00 fb f4 cc 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 fe 3f 8e f9 e8 c9 [ 441.904920][ C1] RSP: 0018:ffffc90000da8b10 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 441.913365][ C1] RAX: 1ffffffff1326676 RBX: ffff8880a46f6e20 RCX: 0000000000000002 [ 441.921356][ C1] RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff8880a3224b14 [ 441.929346][ C1] RBP: ffffc90000da8b30 R08: 1ffffffff165e7b1 R09: fffffbfff165e7b2 [ 441.937436][ C1] R10: fffffbfff165e7b1 R11: ffffffff8b2f3d8f R12: 0000000000000003 [ 441.945540][ C1] R13: 0000000000000282 R14: 0000000000000000 R15: 0000000000000001 [ 441.953629][ C1] ? apic_timer_interrupt+0xa/0x20 [ 441.958943][ C1] ? kvm_wait+0x1c0/0x250 [ 441.963371][ C1] __pv_queued_spin_lock_slowpath+0x9ba/0xc40 [ 441.969467][ C1] ? pv_hash+0xf0/0xf0 [ 441.973547][ C1] ? mark_held_locks+0xf0/0xf0 [ 441.978547][ C1] ? __this_cpu_preempt_check+0x2c/0x190 [ 441.984471][ C1] do_raw_spin_lock+0x21d/0x2f0 [ 441.989354][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 441.994404][ C1] ? lock_acquire+0x190/0x410 [ 441.999187][ C1] ? hash_ip4_gc+0x49/0x150 [ 442.003736][ C1] _raw_spin_lock_bh+0x3b/0x50 [ 442.008518][ C1] ? hash_ip4_gc+0x49/0x150 [ 442.013036][ C1] hash_ip4_gc+0x49/0x150 [ 442.017423][ C1] call_timer_fn+0x1ac/0x780 [ 442.022027][ C1] ? hash_ip4_expire.isra.0+0x8d0/0x8d0 [ 442.027595][ C1] ? msleep_interruptible+0x150/0x150 [ 442.032979][ C1] ? run_timer_softirq+0x6b1/0x1790 [ 442.038417][ C1] ? trace_hardirqs_on+0x67/0x240 [ 442.043491][ C1] ? hash_ip4_expire.isra.0+0x8d0/0x8d0 [ 442.049048][ C1] ? hash_ip4_expire.isra.0+0x8d0/0x8d0 [ 442.054787][ C1] run_timer_softirq+0x6c3/0x1790 [ 442.059933][ C1] ? add_timer+0x930/0x930 [ 442.064367][ C1] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 442.070541][ C1] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 442.076108][ C1] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 442.082120][ C1] ? trace_hardirqs_on+0x67/0x240 [ 442.087168][ C1] __do_softirq+0x262/0x98c [ 442.091692][ C1] ? sched_clock_cpu+0x1b/0x1b0 [ 442.096782][ C1] irq_exit+0x19b/0x1e0 [ 442.100979][ C1] smp_apic_timer_interrupt+0x1a3/0x610 [ 442.106545][ C1] apic_timer_interrupt+0xf/0x20 [ 442.111487][ C1] [ 442.114482][ C1] RIP: 0010:__schedule+0x119/0x1f90 [ 442.119693][ C1] Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 ad 18 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 7d 18 4c 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 d2 18 00 00 49 81 3f 9d 6e ac 57 0f 85 47 1e 00 00 84 db 75 [ 442.140269][ C1] RSP: 0018:ffffc90001f17b70 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 442.148698][ C1] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff839f64da [ 442.156695][ C1] RDX: 1ffff920003e2000 RSI: ffffffff839f64e3 RDI: ffff8880a3224298 [ 442.164763][ C1] RBP: ffffc90001f17c38 R08: ffff8880a3224280 R09: 0000000000000000 [ 442.172751][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ae937340 [ 442.180743][ C1] R13: ffff8880a3224280 R14: 0000000000037340 R15: ffffc90001f10000 [ 442.188776][ C1] ? debug_smp_processor_id+0x2a/0x18a [ 442.194263][ C1] ? debug_smp_processor_id+0x33/0x18a [ 442.199767][ C1] ? hrtimer_start_range_ns+0x676/0xcd0 [ 442.205451][ C1] ? __sched_text_start+0x8/0x8 [ 442.210322][ C1] ? enqueue_hrtimer+0x430/0x430 [ 442.215278][ C1] ? _raw_spin_unlock_irqrestore+0x9f/0xe0 [ 442.221156][ C1] schedule+0xdc/0x2b0 [ 442.225346][ C1] do_nanosleep+0x21f/0x640 [ 442.229887][ C1] ? schedule_timeout_idle+0x90/0x90 [ 442.235277][ C1] ? memset+0x32/0x40 [ 442.239322][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 442.245675][ C1] ? __hrtimer_init+0x13d/0x280 [ 442.250573][ C1] hrtimer_nanosleep+0x297/0x550 [ 442.255527][ C1] ? nanosleep_copyout+0x110/0x110 [ 442.260648][ C1] ? _copy_from_user+0x12c/0x1a0 [ 442.265608][ C1] ? hrtimer_init_sleeper_on_stack+0xa0/0xa0 [ 442.271623][ C1] __ia32_sys_nanosleep_time32+0x1ad/0x230 [ 442.277454][ C1] ? __x64_sys_nanosleep_time32+0x230/0x230 [ 442.283398][ C1] ? do_fast_syscall_32+0xd1/0xe16 [ 442.288540][ C1] ? lockdep_hardirqs_on+0x421/0x5e0 [ 442.293857][ C1] ? trace_hardirqs_on+0x67/0x240 [ 442.299194][ C1] do_fast_syscall_32+0x27b/0xe16 [ 442.304363][ C1] entry_SYSENTER_compat+0x70/0x7f [ 442.309511][ C1] RIP: 0023:0xf7f089a9 [ 442.313618][ C1] Code: 00 00 00 89 d3 5b 5e 5f 5d c3 b8 80 96 98 00 eb c4 8b 04 24 c3 8b 1c 24 c3 8b 34 24 c3 8b 3c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 442.333406][ C1] RSP: 002b:00000000ffe365ac EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 [ 442.341986][ C1] RAX: ffffffffffffffda RBX: 00000000ffe365d8 RCX: 0000000000000000 [ 442.349965][ C1] RDX: 0000000000002611 RSI: 0000000000051fda RDI: 0000000000000000 [ 442.357946][ C1] RBP: 00000000ffe36628 R08: 0000000000000000 R09: 0000000000000000 [ 442.366044][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 442.374147][ C1] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 442.382160][ C1] rcu: rcu_preempt kthread starved for 10502 jiffies! g9453 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 [ 442.393393][ C1] rcu: RCU grace-period kthread stack dump: [ 442.399664][ C1] rcu_preempt R running task 29264 10 2 0x80004000 [ 442.407841][ C1] Call Trace: [ 442.411286][ C1] __schedule+0x934/0x1f90 [ 442.415739][ C1] ? __sched_text_start+0x8/0x8 [ 442.420612][ C1] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 442.426555][ C1] ? schedule_timeout+0x47c/0xc50 [ 442.431703][ C1] ? lockdep_hardirqs_on+0x421/0x5e0 [ 442.437028][ C1] schedule+0xdc/0x2b0 [ 442.441125][ C1] schedule_timeout+0x486/0xc50 [ 442.446006][ C1] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 442.451828][ C1] ? usleep_range+0x170/0x170 [ 442.456519][ C1] ? trace_hardirqs_on+0x67/0x240 [ 442.461680][ C1] ? __next_timer_interrupt+0x1a0/0x1a0 [ 442.467318][ C1] ? swake_up_one+0x60/0x60 [ 442.471955][ C1] rcu_gp_kthread+0x9b2/0x18d0 [ 442.476780][ C1] ? rcu_barrier+0x350/0x350 [ 442.481388][ C1] ? trace_hardirqs_on+0x67/0x240 [ 442.486434][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 442.492782][ C1] ? __kthread_parkme+0x108/0x1c0 [ 442.497837][ C1] ? __kasan_check_read+0x11/0x20 [ 442.502887][ C1] kthread+0x361/0x430 [ 442.506970][ C1] ? rcu_barrier+0x350/0x350 [ 442.511571][ C1] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 442.517397][ C1] ret_from_fork+0x24/0x30