[....] Starting enhanced syslogd: rsyslogd[   12.268591] audit: type=1400 audit(1515534194.628:5): avc:  denied  { syslog } for  pid=3343 comm="rsyslogd" capability=34  scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1
[?25l[?1c7[ ok 8[?25h[?0c.
[....] 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.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   16.622160] audit: type=1400 audit(1515534198.981:6): avc:  denied  { map } for  pid=3482 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 '10.128.0.18' (ECDSA) to the list of known hosts.
net.ipv6.conf.syz0.accept_dad = 0
net.ipv6.conf.syz0.router_solicitations = 0
[   22.850613] audit: type=1400 audit(1515534205.210:7): avc:  denied  { map } for  pid=3497 comm="syzkaller369142" path="/root/syzkaller369142330" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
[   22.972324] 
[   22.972704] audit: type=1400 audit(1515534205.331:8): avc:  denied  { map } for  pid=3497 comm="syzkaller369142" path="/dev/ashmem" dev="devtmpfs" ino=8894 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:device_t:s0 tclass=chr_file permissive=1
[   22.998687] ======================================================
[   23.004972] WARNING: possible circular locking dependency detected
[   23.011262] 4.15.0-rc7+ #255 Not tainted
[   23.015285] ------------------------------------------------------
[   23.021581] syzkaller369142/3497 is trying to acquire lock:
[   23.027262]  (&sb->s_type->i_mutex_key#11){++++}, at: [<00000000cf5dc36e>] shmem_file_llseek+0xef/0x240
[   23.036782] 
[   23.036782] but task is already holding lock:
[   23.042714]  (ashmem_mutex){+.+.}, at: [<00000000a81ce9c2>] ashmem_llseek+0x56/0x1f0
[   23.050585] 
[   23.050585] which lock already depends on the new lock.
[   23.050585] 
[   23.058862] 
[   23.058862] the existing dependency chain (in reverse order) is:
[   23.066444] 
[   23.066444] -> #2 (ashmem_mutex){+.+.}:
[   23.071867]        __mutex_lock+0x16f/0x1a80
[   23.076240]        mutex_lock_nested+0x16/0x20
[   23.080785]        ashmem_mmap+0x53/0x410
[   23.084899]        mmap_region+0xa99/0x15a0
[   23.089184]        do_mmap+0x6c0/0xe00
[   23.093038]        vm_mmap_pgoff+0x1de/0x280
[   23.097412]        SyS_mmap_pgoff+0x462/0x5f0
[   23.101873]        SyS_mmap+0x16/0x20
[   23.105640]        entry_SYSCALL_64_fastpath+0x23/0x9a
[   23.110876] 
[   23.110876] -> #1 (&mm->mmap_sem){++++}:
[   23.116384]        __might_fault+0x13a/0x1d0
[   23.120762]        _copy_to_user+0x2c/0xc0
[   23.124963]        filldir+0x1a7/0x320
[   23.128814]        dcache_readdir+0x12d/0x5e0
[   23.133274]        iterate_dir+0x1ca/0x530
[   23.137473]        SyS_getdents+0x225/0x450
[   23.141758]        entry_SYSCALL_64_fastpath+0x23/0x9a
[   23.147005] 
[   23.147005] -> #0 (&sb->s_type->i_mutex_key#11){++++}:
[   23.153740]        lock_acquire+0x1d5/0x580
[   23.158026]        down_write+0x87/0x120
[   23.162053]        shmem_file_llseek+0xef/0x240
[   23.166688]        vfs_llseek+0xa2/0xd0
[   23.170630]        ashmem_llseek+0xe7/0x1f0
[   23.174915]        SyS_lseek+0xeb/0x170
[   23.178855]        entry_SYSCALL_64_fastpath+0x23/0x9a
[   23.184102] 
[   23.184102] other info that might help us debug this:
[   23.184102] 
[   23.192214] Chain exists of:
[   23.192214]   &sb->s_type->i_mutex_key#11 --> &mm->mmap_sem --> ashmem_mutex
[   23.192214] 
[   23.203720]  Possible unsafe locking scenario:
[   23.203720] 
[   23.209740]        CPU0                    CPU1
[   23.214371]        ----                    ----
[   23.219000]   lock(ashmem_mutex);
[   23.222417]                                lock(&mm->mmap_sem);
[   23.228438]                                lock(ashmem_mutex);
[   23.234371]   lock(&sb->s_type->i_mutex_key#11);
[   23.239092] 
[   23.239092]  *** DEADLOCK ***
[   23.239092] 
[   23.245115] 1 lock held by syzkaller369142/3497:
[   23.249833]  #0:  (ashmem_mutex){+.+.}, at: [<00000000a81ce9c2>] ashmem_llseek+0x56/0x1f0
[   23.258118] 
[   23.258118] stack backtrace:
[   23.262584] CPU: 0 PID: 3497 Comm: syzkaller369142 Not tainted 4.15.0-rc7+ #255
[   23.269994] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   23.279313] Call Trace:
[   23.281875]  dump_stack+0x194/0x257
[   23.285468]  ? arch_local_irq_restore+0x53/0x53
[   23.290114]  print_circular_bug.isra.37+0x2cd/0x2dc
[   23.295096]  ? save_trace+0xe0/0x2b0
[   23.298777]  __lock_acquire+0x30a8/0x3e00
[   23.302893]  ? debug_check_no_locks_freed+0x3c0/0x3c0
[   23.308057]  ? ashmem_llseek+0x56/0x1f0
[   23.311998]  ? lock_release+0xa40/0xa40
[   23.315939]  ? trace_event_raw_event_sched_switch+0x800/0x800
[   23.321792]  ? rcu_note_context_switch+0x710/0x710
[   23.326689]  ? vma_wants_writenotify+0x3b0/0x3b0
[   23.331411]  ? __might_sleep+0x95/0x190
[   23.335349]  ? ashmem_llseek+0x56/0x1f0
[   23.339289]  ? __mutex_lock+0x16f/0x1a80
[   23.343314]  ? ashmem_llseek+0x56/0x1f0
[   23.347253]  ? mmap_region+0x52e/0x15a0
[   23.351206]  ? ashmem_llseek+0x56/0x1f0
[   23.355145]  ? mutex_lock_io_nested+0x1900/0x1900
[   23.359956]  ? vm_mmap_pgoff+0x1ed/0x280
[   23.363984]  ? userfaultfd_unmap_complete+0x327/0x510
[   23.369142]  lock_acquire+0x1d5/0x580
[   23.372907]  ? lock_acquire+0x1d5/0x580
[   23.376847]  ? shmem_file_llseek+0xef/0x240
[   23.381135]  ? lock_release+0xa40/0xa40
[   23.385077]  ? trace_event_raw_event_sched_switch+0x800/0x800
[   23.390936]  ? rcu_note_context_switch+0x710/0x710
[   23.395830]  ? __fget_light+0x297/0x380
[   23.399770]  ? __might_sleep+0x95/0x190
[   23.403711]  down_write+0x87/0x120
[   23.407217]  ? shmem_file_llseek+0xef/0x240
[   23.411504]  ? down_read+0x150/0x150
[   23.415207]  ? selinux_capable+0x40/0x40
[   23.419239]  shmem_file_llseek+0xef/0x240
[   23.423354]  ? shmem_free_swap+0x80/0x80
[   23.427380]  vfs_llseek+0xa2/0xd0
[   23.430799]  ashmem_llseek+0xe7/0x1f0
[   23.434565]  ? ashmem_read_iter+0x230/0x230
[   23.438861]  SyS_lseek+0xeb/0x170
[   23.442296]  entry_SYSCALL_64_fastpath+0x23/0x9a
[   23.447028] RIP: 0033:0x444aa9
[   23.450184] RSP: 002b:00007fffd187fb08 EFLAGS: 00000217 ORIG_RAX: 0000000000000008
[   23.457858] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000444aa9
[   23.465103] RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000004
[   23.472338] RBP: 00000