[   39.654050] audit: type=1800 audit(1572692358.782:31): pid=7568 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0
[   39.682946] audit: type=1800 audit(1572692358.782:32): pid=7568 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.

Debian GNU/Linux 7 syzkaller ttyS0

Warning: Permanently added '10.128.0.6' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   49.260632] kauditd_printk_skb: 3 callbacks suppressed
[   49.260646] audit: type=1400 audit(1572692368.442:36): avc:  denied  { map } for  pid=7754 comm="syz-executor621" path="/root/syz-executor621903849" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
[   49.264387] 
[   49.294401] =============================
[   49.298546] WARNING: suspicious RCU usage
[   49.302678] 4.19.81 #0 Not tainted
[   49.306196] -----------------------------
[   49.310327] include/linux/radix-tree.h:241 suspicious rcu_dereference_check() usage!
[   49.318196] 
[   49.318196] other info that might help us debug this:
[   49.318196] 
[   49.326929] 
[   49.326929] rcu_scheduler_active = 2, debug_locks = 1
[   49.333582] 2 locks held by syz-executor621/7754:
[   49.338405]  #0: 00000000baabcbe7 (&sb->s_type->i_mutex_key#12){+.+.}, at: memfd_fcntl+0x235/0x1750
[   49.347601]  #1: 00000000f46f022d (&(&(&mapping->i_pages)->xa_lock)->rlock){-...}, at: memfd_fcntl+0x4bc/0x1750
[   49.357842] 
[   49.357842] stack backtrace:
[   49.362328] CPU: 0 PID: 7754 Comm: syz-executor621 Not tainted 4.19.81 #0
[   49.369233] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   49.378572] Call Trace:
[   49.381155]  dump_stack+0x172/0x1f0
[   49.384774]  lockdep_rcu_suspicious+0x153/0x15d
[   49.389445]  memfd_fcntl+0xfdf/0x1750
[   49.393229]  ? vfs_write+0x2f0/0x560
[   49.396929]  ? find_held_lock+0x35/0x130
[   49.400995]  ? vfs_write+0x2f0/0x560
[   49.404716]  ? memfd_file_seals_ptr+0x160/0x160
[   49.409457]  ? check_preemption_disabled+0x48/0x290
[   49.414474]  do_fcntl+0x200/0x1020
[   49.418018]  ? f_getown+0xc0/0xc0
[   49.421461]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   49.426987]  ? ksys_write+0x1f1/0x2d0
[   49.430791]  ? __sanitizer_cov_trace_switch+0x49/0x80
[   49.435974]  ? selinux_file_fcntl+0x74/0x140
[   49.440370]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   49.445895]  ? security_file_fcntl+0x8d/0xc0
[   49.450288]  __x64_sys_fcntl+0x16d/0x1e0
[   49.454336]  do_syscall_64+0xfd/0x620
[   49.458134]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   49.463310] RIP: 0033:0x440189
[   49.466490] 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
[   49.485382] RSP: 002b:00007ffc0af3c528 EFLAGS: 00000246 ORIG_RAX: 0000000000000048
[   49.493074] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440189
[   49.500328] RDX: 0000000000000008 RSI: 0000000000000409 RDI: 0000000000000003
[   49.507585] RBP: 00000000006ca018 R