[ 37.738632] audit: type=1800 audit(1561206889.088:32): pid=7396 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2450 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 38.455138] audit: type=1800 audit(1561206889.808:33): pid=7396 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2465 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 42.979881] kauditd_printk_skb: 1 callbacks suppressed [ 42.979896] audit: type=1400 audit(1561206894.328:35): avc: denied { map } for pid=7571 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 '10.128.0.6' (ECDSA) to the list of known hosts. executing program executing program executing program executing program [ 1077.207413] audit: type=1400 audit(1561207928.558:36): avc: denied { map } for pid=7583 comm="syz-executor978" path="/root/syz-executor978141630" 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 [ 1182.251835] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: [ 1182.258192] rcu: (detected by 1, t=10502 jiffies, g=5293, q=20) [ 1182.264361] rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4295055363-4295044860), jiffies_till_next_fqs=1, root ->qsmask 0x0 [ 1182.277011] syz-executor978 R running task 26464 7592 7585 0x00000000 [ 1182.284240] Call Trace: [ 1182.286821] [ 1182.289094] sched_show_task.cold+0x292/0x30b [ 1182.293688] ? set_rq_offline.part.0+0x140/0x140 [ 1182.298496] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 1182.303527] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 1182.309130] rcu_check_callbacks.cold+0xaa1/0xd93 [ 1182.314020] update_process_times+0x32/0x80 [ 1182.318380] tick_sched_handle+0xa2/0x190 [ 1182.322540] tick_sched_timer+0x47/0x130 [ 1182.326627] __hrtimer_run_queues+0x33b/0xdd0 [ 1182.331125] ? tick_sched_do_timer+0x1b0/0x1b0 [ 1182.335714] ? hrtimer_start_range_ns+0xc70/0xc70 [ 1182.340564] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 1182.345583] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 1182.350960] hrtimer_interrupt+0x314/0x770 [ 1182.355299] smp_apic_timer_interrupt+0x111/0x550 [ 1182.360156] apic_timer_interrupt+0xf/0x20 [ 1182.364385] [ 1182.366680] RIP: 0010:lock_is_held_type+0x87/0x210 [ 1182.371749] Code: 72 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 69 01 00 00 48 83 3d d1 8e 20 07 00 0f 84 20 01 00 00 9c 58 <0f> 1f 44 00 00 48 c7 c2 50 36 72 88 48 89 c3 48 b8 00 00 00 00 00 [ 1182.390654] RSP: 0018:ffff8880908b7428 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 1182.398371] RAX: 0000000000000286 RBX: ffff8880a112e700 RCX: 0000000000000000 [ 1182.405661] RDX: dffffc0000000000 RSI: 00000000ffffffff RDI: ffff8880a112ef7c [ 1182.412929] RBP: ffff8880908b7448 R08: ffff8880a112e700 R09: ffffed1015d24733 [ 1182.420205] R10: ffffed1015d24732 R11: ffff8880ae923993 R12: ffffffff8879d760 [ 1182.427482] R13: ffff88808efad4f0 R14: 000000000496d9e4 R15: ffff88808efad6f0 [ 1182.434831] rcu_read_lock_sched_held+0x110/0x130 [ 1182.439731] ext4_da_write_end+0x865/0xa50 [ 1182.443975] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 1182.449543] ? iov_iter_copy_from_user_atomic+0x445/0xb40 [ 1182.455136] generic_perform_write+0x2ed/0x520 [ 1182.459734] ? page_endio+0x780/0x780 [ 1182.463580] ? current_time+0x140/0x140 [ 1182.467568] ? lock_acquire+0x16f/0x3f0 [ 1182.471556] ? ext4_file_write_iter+0x23f/0x1060 [ 1182.476321] __generic_file_write_iter+0x25e/0x630 [ 1182.481268] ext4_file_write_iter+0x32b/0x1060 [ 1182.485861] ? ext4_file_mmap+0x410/0x410 [ 1182.490020] ? ___might_sleep+0x163/0x280 [ 1182.494229] do_iter_readv_writev+0x558/0x830 [ 1182.498730] ? vfs_dedupe_file_range+0x6f0/0x6f0 [ 1182.503528] ? security_file_permission+0x89/0x230 [ 1182.508462] ? rw_verify_area+0x118/0x360 [ 1182.512620] do_iter_write+0x184/0x5f0 [ 1182.516529] ? rcu_read_lock_sched_held+0x110/0x130 [ 1182.521578] ? __kmalloc+0x5e1/0x750 [ 1182.525323] vfs_iter_write+0x77/0xb0 [ 1182.529223] iter_file_splice_write+0x661/0xbd0 [ 1182.533898] ? atime_needs_update+0x5f0/0x5f0 [ 1182.538409] ? page_cache_pipe_buf_confirm+0x2b0/0x2b0 [ 1182.543704] ? security_file_permission+0x89/0x230 [ 1182.548644] ? rw_verify_area+0x118/0x360 [ 1182.552796] ? page_cache_pipe_buf_confirm+0x2b0/0x2b0 [ 1182.558079] direct_splice_actor+0x123/0x190 [ 1182.562499] splice_direct_to_actor+0x2e7/0x890 [ 1182.567368] ? generic_pipe_buf_nosteal+0x10/0x10 [ 1182.572229] ? do_splice_to+0x180/0x180 [ 1182.576208] ? security_file_permission+0x89/0x230 [ 1182.581148] ? rw_verify_area+0x118/0x360 [ 1182.585300] do_splice_direct+0x1da/0x2a0 [ 1182.589467] ? splice_direct_to_actor+0x890/0x890 [ 1182.594320] ? rcu_read_lock_sched_held+0x110/0x130 [ 1182.599339] ? rcu_sync_lockdep_assert+0x6d/0xb0 [ 1182.604217] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 1182.609767] ? __sb_start_write+0x1ac/0x360 [ 1182.614093] do_sendfile+0x597/0xce0 [ 1182.617826] ? do_compat_pwritev64+0x1c0/0x1c0 [ 1182.622417] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 1182.628040] ? _copy_from_user+0xdd/0x150 [ 1182.632197] __x64_sys_sendfile64+0x15a/0x220 [ 1182.636706] ? __ia32_sys_sendfile+0x230/0x230 [ 1182.641322] ? do_syscall_64+0x26/0x620 [ 1182.645300] ? lockdep_hardirqs_on+0x415/0x5d0 [ 1182.649937] ? trace_hardirqs_on+0x67/0x220 [ 1182.654268] do_syscall_64+0xfd/0x620 [ 1182.658080] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1182.663281] RIP: 0033:0x4417c9 [ 1182.666476] 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 [ 1182.685377] RSP: 002b:00007ffedf309698 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 [ 1182.693096] RAX: ffffffffffffffda RBX: 00007ffedf309840 RCX: 00000000004417c9 [ 1182.700366] RDX: 0000000020000000 RSI: 0000000000000003 RDI: 0000000000000003 [ 1182.707633] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 1182.714921] R10: 00008080fffffffe R11: 0000000000000246 R12: 0000000000000000 [ 1182.722189] R13: 00000000004024a0 R14: 0000000000000000 R15: 0000000000000000 [ 1182.729485] rcu: rcu_preempt kthread starved for 10549 jiffies! g5293 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 [ 1182.741688] rcu: RCU grace-period kthread stack dump: [ 1182.746878] rcu_preempt R running task 29624 10 2 0x80000000 [ 1182.754089] Call Trace: [ 1182.756746] __schedule+0x80d/0x1c70 [ 1182.760471] ? pci_mmcfg_check_reserved+0x170/0x170 [ 1182.765585] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 1182.770693] ? lockdep_hardirqs_on+0x415/0x5d0 [ 1182.775285] ? trace_hardirqs_on+0x67/0x220 [ 1182.779725] schedule+0x92/0x1c0 [ 1182.783207] schedule_timeout+0x4db/0xfc0 [ 1182.787364] ? usleep_range+0x170/0x170 [ 1182.791365] ? trace_hardirqs_on+0x67/0x220 [ 1182.795710] ? kasan_check_read+0x11/0x20 [ 1182.799865] ? __next_timer_interrupt+0x1a0/0x1a0 [ 1182.804720] ? prepare_to_swait_exclusive+0x120/0x120 [ 1182.809918] rcu_gp_kthread+0xd5c/0x2190 [ 1182.814024] ? rcu_blocking_is_gp+0x90/0x90 [ 1182.818348] ? trace_hardirqs_on+0x67/0x220 [ 1182.822674] ? kasan_check_read+0x11/0x20 [ 1182.826832] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 1182.831938] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 1182.837635] ? __kthread_parkme+0xfb/0x1b0 [ 1182.841879] kthread+0x354/0x420 [ 1182.845250] ? rcu_blocking_is_gp+0x90/0x90 [ 1182.849572] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 1182.855113] ret_from_fork+0x24/0x30