[ 47.122438][ T26] audit: type=1800 audit(1556893549.390:30): pid=8083 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 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 mcstransd: [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 53.356124][ T26] kauditd_printk_skb: 4 callbacks suppressed [ 53.356140][ T26] audit: type=1400 audit(1556893555.650:35): avc: denied { map } for pid=8259 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.0.229' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program [ 775.901531][ T26] audit: type=1400 audit(1556894278.190:36): avc: denied { map } for pid=8271 comm="syz-executor364" path="/root/syz-executor364472056" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 775.973604][ C0] hrtimer: interrupt took 65643 ns [ 881.002278][ C0] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: [ 881.009288][ C0] rcu: (detected by 0, t=10502 jiffies, g=6601, q=1) [ 881.016070][ C0] rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295025263-4295014761), jiffies_till_next_fqs=1, root ->qsmask 0x0 [ 881.029437][ C0] syz-executor364 R running task 26328 8286 8273 0x00000000 [ 881.037373][ C0] Call Trace: [ 881.040666][ C0] [ 881.044550][ C0] sched_show_task.cold+0x291/0x2fc [ 881.049817][ C0] rcu_sched_clock_irq.cold+0xa10/0xa4a [ 881.055421][ C0] update_process_times+0x32/0x80 [ 881.060486][ C0] tick_sched_handle+0xa2/0x190 [ 881.065350][ C0] tick_sched_timer+0x47/0x130 [ 881.070394][ C0] __hrtimer_run_queues+0x33e/0xde0 [ 881.075716][ C0] ? tick_sched_do_timer+0x1b0/0x1b0 [ 881.081120][ C0] ? hrtimer_start_range_ns+0xc80/0xc80 [ 881.086765][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 881.092501][ C0] ? ktime_get_update_offsets_now+0x2d9/0x440 [ 881.098581][ C0] hrtimer_interrupt+0x314/0x770 [ 881.103619][ C0] smp_apic_timer_interrupt+0x120/0x570 [ 881.109185][ C0] apic_timer_interrupt+0xf/0x20 [ 881.114134][ C0] [ 881.117147][ C0] RIP: 0010:kfree+0x186/0x230 [ 881.122195][ C0] Code: 59 7e 0f 85 b3 fe ff ff e8 58 fc 57 ff e9 a9 fe ff ff e8 3d 8f cd ff 48 83 3d f5 2c ea 06 00 0f 84 9e 00 00 00 48 89 df 57 9d <0f> 1f 44 00 00 5b 41 5c 41 5d 41 5e 5d c3 4c 89 f2 4c 89 e6 4c 89 [ 881.143304][ C0] RSP: 0018:ffff88809acdf918 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 881.151723][ C0] RAX: 0000000000000007 RBX: 0000000000000286 RCX: 1ffff110116dbd8c [ 881.159702][ C0] RDX: 0000000000000000 RSI: ffff88808b6dec40 RDI: 0000000000000286 [ 881.167680][ C0] RBP: ffff88809acdf938 R08: ffff88808b6de3c0 R09: ffff88808b6dec60 [ 881.175655][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88808ce5e200 [ 881.183629][ C0] R13: ffff8880aa4007c0 R14: ffffffff81be7b24 R15: 0000000000000000 [ 881.191695][ C0] ? iter_file_splice_write+0x564/0xbe0 [ 881.197276][ C0] iter_file_splice_write+0x564/0xbe0 [ 881.202694][ C0] ? atime_needs_update+0x5f0/0x5f0 [ 881.207947][ C0] ? page_cache_pipe_buf_confirm+0x2b0/0x2b0 [ 881.213992][ C0] ? rw_verify_area+0x118/0x360 [ 881.219030][ C0] ? page_cache_pipe_buf_confirm+0x2b0/0x2b0 [ 881.225020][ C0] direct_splice_actor+0x126/0x1a0 [ 881.230149][ C0] splice_direct_to_actor+0x369/0x970 [ 881.235549][ C0] ? generic_pipe_buf_nosteal+0x10/0x10 [ 881.241279][ C0] ? do_splice_to+0x190/0x190 [ 881.245966][ C0] ? rw_verify_area+0x118/0x360 [ 881.250831][ C0] do_splice_direct+0x1da/0x2a0 [ 881.255689][ C0] ? splice_direct_to_actor+0x970/0x970 [ 881.261248][ C0] ? rcu_read_lock_sched_held+0x110/0x130 [ 881.266975][ C0] ? rcu_sync_lockdep_assert+0x73/0xb0 [ 881.272524][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 881.278872][ C0] ? __sb_start_write+0x1ac/0x360 [ 881.283921][ C0] do_sendfile+0x597/0xd00 [ 881.288360][ C0] ? do_compat_pwritev64+0x1c0/0x1c0 [ 881.293658][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 881.299976][ C0] ? _copy_from_user+0xdd/0x150 [ 881.304850][ C0] __x64_sys_sendfile64+0x15a/0x220 [ 881.310194][ C0] ? __ia32_sys_sendfile+0x230/0x230 [ 881.315537][ C0] ? do_syscall_64+0x26/0x610 [ 881.320266][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 881.325628][ C0] ? trace_hardirqs_on+0x67/0x230 [ 881.331101][ C0] do_syscall_64+0x103/0x610 [ 881.335708][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 881.341695][ C0] RIP: 0033:0x446989 [ 881.345608][ C0] Code: e8 0c e8 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 5b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 881.365229][ C0] RSP: 002b:00007f2c15dd5da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 [ 881.373680][ C0] RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 0000000000446989 [ 881.381716][ C0] RDX: 0000000020000000 RSI: 0000000000000004 RDI: 0000000000000004 [ 881.389702][ C0] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000 [ 881.397703][ C0] R10: 00008080fffffffe R11: 0000000000000246 R12: 00000000006dbc2c [ 881.405684][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 881.414235][ C0] rcu: rcu_preempt kthread starved for 10502 jiffies! g6601 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 [ 881.425338][ C0] rcu: RCU grace-period kthread stack dump: [ 881.431314][ C0] rcu_preempt R running task 29776 10 2 0x80000000 [ 881.439312][ C0] Call Trace: [ 881.442676][ C0] __schedule+0x813/0x1cc0 [ 881.447121][ C0] ? __sched_text_start+0x8/0x8 [ 881.451998][ C0] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 881.457819][ C0] ? lockdep_hardirqs_on+0x418/0x5d0 [ 881.463116][ C0] ? trace_hardirqs_on+0x67/0x230 [ 881.468190][ C0] schedule+0x92/0x180 [ 881.472266][ C0] schedule_timeout+0x4db/0xfd0 [ 881.477125][ C0] ? usleep_range+0x170/0x170 [ 881.481816][ C0] ? trace_hardirqs_on+0x67/0x230 [ 881.486853][ C0] ? kasan_check_read+0x11/0x20 [ 881.491717][ C0] ? __next_timer_interrupt+0x1a0/0x1a0 [ 881.497342][ C0] ? prepare_to_swait_exclusive+0x120/0x120 [ 881.503254][ C0] rcu_gp_kthread+0x962/0x17b0 [ 881.508029][ C0] ? kasan_check_write+0x14/0x20 [ 881.512981][ C0] ? wait_rcu_exp_gp+0x50/0x50 [ 881.517751][ C0] ? trace_hardirqs_on+0x67/0x230 [ 881.523375][ C0] ? kasan_check_read+0x11/0x20 [ 881.528240][ C0] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 881.534058][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 881.540365][ C0] ? __kthread_parkme+0xfb/0x1b0 [ 881.545381][ C0] kthread+0x357/0x430 [ 881.549488][ C0] ? wait_rcu_exp_gp+0x50/0x50 [ 881.554258][ C0] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 881.560513][ C0] ret_from_fork+0x3a/0x50