[   39.436758] audit: type=1800 audit(1572345579.174:32): pid=7445 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 mcstransd: 
[....] 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.
[   40.304110] audit: type=1800 audit(1572345580.154:33): pid=7445 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

Warning: Permanently added '10.128.0.212' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   48.155809] kauditd_printk_skb: 2 callbacks suppressed
[   48.155824] audit: type=1400 audit(1572345588.004:36): avc:  denied  { map } for  pid=7630 comm="syz-executor615" path="/root/syz-executor615681230" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
[   48.160030] 
[   48.189279] =============================
[   48.193407] WARNING: suspicious RCU usage
[   48.197547] 4.19.81 #0 Not tainted
[   48.201062] -----------------------------
[   48.205192] include/linux/radix-tree.h:241 suspicious rcu_dereference_check() usage!
[   48.213063] 
[   48.213063] other info that might help us debug this:
[   48.213063] 
[   48.221226] 
[   48.221226] rcu_scheduler_active = 2, debug_locks = 1
[   48.228058] 2 locks held by syz-executor615/7630:
[   48.232886]  #0: 00000000b659d878 (&sb->s_type->i_mutex_key#12){+.+.}, at: memfd_fcntl+0x235/0x1750
[   48.242103]  #1: 000000002aa6086e (&(&(&mapping->i_pages)->xa_lock)->rlock){-...}, at: memfd_fcntl+0x4bc/0x1750
[   48.252372] 
[   48.252372] stack backtrace:
[   48.256861] CPU: 1 PID: 7630 Comm: syz-executor615 Not tainted 4.19.81 #0
[   48.263765] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   48.273274] Call Trace:
[   48.275858]  dump_stack+0x172/0x1f0
[   48.279614]  lockdep_rcu_suspicious+0x153/0x15d
[   48.284276]  memfd_fcntl+0xfdf/0x1750
[   48.288149]  ? vfs_write+0x2f0/0x560
[   48.291856]  ? find_held_lock+0x35/0x130
[   48.295915]  ? vfs_write+0x2f0/0x560
[   48.299617]  ? memfd_file_seals_ptr+0x160/0x160
[   48.304277]  ? check_preemption_disabled+0x48/0x290
[   48.309285]  do_fcntl+0x200/0x1020
[   48.312829]  ? f_getown+0xc0/0xc0
[   48.316284]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   48.322772]  ? ksys_write+0x1f1/0x2d0
[   48.326558]  ? __sanitizer_cov_trace_switch+0x49/0x80
[   48.331739]  ? selinux_file_fcntl+0x74/0x140
[   48.336136]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   48.341660]  ? security_file_fcntl+0x8d/0xc0
[   48.346056]  __x64_sys_fcntl+0x16d/0x1e0
[   48.350104]  do_syscall_64+0xfd/0x620
[   48.353898]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   48.359086] RIP: 0033:0x4401b9
[   48.362268] 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
[   48.381594] RSP: 002b:00007ffedef331e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000048
[   48.389642] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401b9
[   48.396899] RDX: 0000000000000009 RSI: 0000000000000409 RDI: 0000000000000003
[   48.404226] RBP: 00000000006ca