Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [ 37.513871] audit: type=1800 audit(1572347097.305:33): pid=7310 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 [ 37.537239] audit: type=1800 audit(1572347097.305:34): pid=7310 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2456 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 41.510684] audit: type=1400 audit(1572347101.305:35): avc: denied { map } for pid=7484 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 '10.128.0.231' (ECDSA) to the list of known hosts. executing program [ 48.120959] audit: type=1400 audit(1572347107.915:36): avc: denied { map } for pid=7496 comm="syz-executor288" path="/root/syz-executor288023981" 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 [ 48.124321] [ 48.148988] ============================= [ 48.153118] WARNING: suspicious RCU usage [ 48.157243] 4.19.81 #0 Not tainted [ 48.160758] ----------------------------- [ 48.164884] include/linux/radix-tree.h:241 suspicious rcu_dereference_check() usage! [ 48.172737] [ 48.172737] other info that might help us debug this: [ 48.172737] [ 48.180860] [ 48.180860] rcu_scheduler_active = 2, debug_locks = 1 [ 48.187509] 2 locks held by syz-executor288/7496: [ 48.192326] #0: 00000000e6897a60 (&sb->s_type->i_mutex_key#12){+.+.}, at: memfd_fcntl+0x235/0x1750 [ 48.201516] #1: 0000000050fccb66 (&(&(&mapping->i_pages)->xa_lock)->rlock){-...}, at: memfd_fcntl+0x4bc/0x1750 [ 48.211740] [ 48.211740] stack backtrace: [ 48.216219] CPU: 0 PID: 7496 Comm: syz-executor288 Not tainted 4.19.81 #0 [ 48.223122] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.232457] Call Trace: [ 48.235037] dump_stack+0x172/0x1f0 [ 48.238652] lockdep_rcu_suspicious+0x153/0x15d [ 48.243306] memfd_fcntl+0xfdf/0x1750 [ 48.247093] ? vfs_write+0x2f0/0x560 [ 48.250789] ? find_held_lock+0x35/0x130 [ 48.254831] ? vfs_write+0x2f0/0x560 [ 48.258545] ? memfd_file_seals_ptr+0x160/0x160 [ 48.263216] ? check_preemption_disabled+0x48/0x290 [ 48.268217] do_fcntl+0x200/0x1020 [ 48.271740] ? f_getown+0xc0/0xc0 [ 48.275190] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.280708] ? ksys_write+0x1f1/0x2d0 [ 48.284489] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 48.289683] ? selinux_file_fcntl+0x74/0x140 [ 48.294092] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.299634] ? security_file_fcntl+0x8d/0xc0 [ 48.304054] __x64_sys_fcntl+0x16d/0x1e0 [ 48.308142] do_syscall_64+0xfd/0x620 [ 48.311938] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.317106] RIP: 0033:0x4401b9 [ 48.320290] 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 [ 48.339181] RSP: 002b:00007ffc6c580da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000048 [ 48.346880] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401b9 [ 48.354131] RDX: 0000000000000009 RSI: 0000000000000409 RDI: 0000000000000003 [ 48.361410] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 48.368673] R10: 0000000000000000 R11