[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] startpar: service(s) returned failure: ssh ...[?25l[?1c7[FAIL8[?25h[?0c failed! Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 48.342461][ T26] kauditd_printk_skb: 4 callbacks suppressed [ 48.342476][ T26] audit: type=1400 audit(1556004920.653:35): avc: denied { map } for pid=8108 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 '10.128.0.250' (ECDSA) to the list of known hosts. executing program [ 503.981997][ T26] audit: type=1400 audit(1556005376.293:36): avc: denied { map } for pid=8120 comm="syz-executor033" path="/root/syz-executor033533901" 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 [ 504.054665][ T26] audit: type=1804 audit(1556005376.353:37): pid=8120 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=open_writers comm="syz-executor033" name="/root/bus" dev="sda1" ino=2339 res=1 [ 504.270993][ C1] hrtimer: interrupt took 34243 ns [ 634.520917][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 634.527706][ C1] rcu: 1-....: (10777 ticks this GP) idle=3f2/1/0x4000000000000002 softirq=11561/11563 fqs=5245 [ 634.538450][ C1] rcu: (t=10500 jiffies g=5965 q=5) [ 634.543813][ C1] NMI backtrace for cpu 1 [ 634.548129][ C1] CPU: 1 PID: 8120 Comm: syz-executor033 Not tainted 5.1.0-rc6 #78 [ 634.555998][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 634.566053][ C1] Call Trace: [ 634.569327][ C1] [ 634.572281][ C1] dump_stack+0x172/0x1f0 [ 634.576607][ C1] nmi_cpu_backtrace.cold+0x63/0xa4 [ 634.581869][ C1] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 634.587506][ C1] nmi_trigger_cpumask_backtrace+0x1be/0x236 [ 634.597026][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 634.603002][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 634.608231][ C1] ? find_next_bit+0x107/0x130 [ 634.613093][ C1] rcu_sched_clock_irq.cold+0x500/0xa4a [ 634.618757][ C1] ? raise_softirq+0x11f/0x310 [ 634.623568][ C1] update_process_times+0x32/0x80 [ 634.628651][ C1] tick_sched_handle+0xa2/0x190 [ 634.633498][ C1] tick_sched_timer+0x47/0x130 [ 634.638296][ C1] __hrtimer_run_queues+0x33e/0xde0 [ 634.643483][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 634.648754][ C1] ? hrtimer_start_range_ns+0xc80/0xc80 [ 634.654332][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 634.660156][ C1] ? ktime_get_update_offsets_now+0x2d9/0x440 [ 634.666412][ C1] hrtimer_interrupt+0x314/0x770 [ 634.671402][ C1] smp_apic_timer_interrupt+0x120/0x570 [ 634.677083][ C1] apic_timer_interrupt+0xf/0x20 [ 634.682050][ C1] [ 634.685028][ C1] RIP: 0010:do_iter_write+0x0/0x610 [ 634.690288][ C1] Code: ff ff e8 43 57 f7 ff e9 4c ff ff ff 49 c7 c7 ea ff ff ff e9 74 ff ff ff 49 c7 c7 f7 ff ff ff e9 68 ff ff ff e8 b1 e7 91 ff 90 <55> 48 89 e5 41 57 41 56 41 55 49 89 f5 41 54 41 89 cc 53 48 89 fb [ 634.709997][ C1] RSP: 0018:ffff88808900f908 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 [ 634.718680][ C1] RAX: ffff888091bfe700 RBX: ffffffff877a4ba0 RCX: 0000000000000000 [ 634.726787][ C1] RDX: ffff88808900fa70 RSI: ffff88808900fa08 RDI: ffff888082b18500 [ 634.734756][ C1] RBP: ffff88808900f938 R08: ffff888091bfe700 R09: ffffed1015d25bc8 [ 634.742733][ C1] R10: ffffed1015d25bc7 R11: ffff8880ae92de3b R12: ffff888082b18500 [ 634.750756][ C1] R13: ffff88808900fa08 R14: ffff88808900fa70 R15: 0000000000000000 [ 634.758755][ C1] ? vfs_iter_write+0x77/0xb0 [ 634.763506][ C1] iter_file_splice_write+0x662/0xbe0 [ 634.768915][ C1] ? atime_needs_update+0x5f0/0x5f0 [ 634.774333][ C1] ? page_cache_pipe_buf_confirm+0x2b0/0x2b0 [ 634.780434][ C1] ? rw_verify_area+0x118/0x360 [ 634.785584][ C1] ? page_cache_pipe_buf_confirm+0x2b0/0x2b0 [ 634.791574][ C1] direct_splice_actor+0x126/0x1a0 [ 634.796912][ C1] splice_direct_to_actor+0x369/0x970 [ 634.802328][ C1] ? generic_pipe_buf_nosteal+0x10/0x10 [ 634.807869][ C1] ? do_splice_to+0x190/0x190 [ 634.812540][ C1] ? rw_verify_area+0x118/0x360 [ 634.817376][ C1] do_splice_direct+0x1da/0x2a0 [ 634.822218][ C1] ? splice_direct_to_actor+0x970/0x970 [ 634.827857][ C1] ? retint_kernel+0x2d/0x2d [ 634.832579][ C1] do_sendfile+0x597/0xd00 [ 634.836999][ C1] ? do_compat_pwritev64+0x1c0/0x1c0 [ 634.842280][ C1] __x64_sys_sendfile64+0x1dd/0x220 [ 634.847472][ C1] ? __ia32_sys_sendfile+0x230/0x230 [ 634.852832][ C1] ? do_syscall_64+0x26/0x610 [ 634.857560][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 634.862940][ C1] ? trace_hardirqs_on+0x67/0x230 [ 634.867966][ C1] do_syscall_64+0x103/0x610 [ 634.872570][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 634.878481][ C1] RIP: 0033:0x440339 [ 634.882367][ C1] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 634.902026][ C1] RSP: 002b:00007fff34c7a5b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 [ 634.910447][ C1] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440339 [ 634.918411][ C1] RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000003 [ 634.926376][ C1] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 634.934326][ C1] R10: 00008000fffffffe R11: 0000000000000246 R12: 0000000000401bc0 [ 634.942280][ C1] R13: 0000000000401c50 R14: 0000000000000000 R15: 0000000000000000