[....] 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. [ 37.330096] audit: type=1800 audit(1572690602.947:33): pid=7230 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 syzkaller login: [ 42.349118] kauditd_printk_skb: 1 callbacks suppressed [ 42.349131] audit: type=1400 audit(1572690607.967:35): avc: denied { map } for pid=7404 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 '10.128.0.133' (ECDSA) to the list of known hosts. executing program [ 48.812506] audit: type=1400 audit(1572690614.427:36): avc: denied { map } for pid=7416 comm="syz-executor868" path="/root/syz-executor868043492" 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 [ 48.865281] [ 48.867058] ============================= [ 48.871184] WARNING: suspicious RCU usage [ 48.875314] 4.19.81 #0 Not tainted [ 48.878840] ----------------------------- [ 48.882970] include/linux/radix-tree.h:241 suspicious rcu_dereference_check() usage! [ 48.890828] [ 48.890828] other info that might help us debug this: [ 48.890828] [ 48.898957] [ 48.898957] rcu_scheduler_active = 2, debug_locks = 1 [ 48.905606] 2 locks held by syz-executor868/7416: [ 48.910426] #0: 00000000787f7aac (&sb->s_type->i_mutex_key#12){+.+.}, at: memfd_fcntl+0x235/0x1750 [ 48.919621] #1: 00000000c86469ec (&(&(&mapping->i_pages)->xa_lock)->rlock){-...}, at: memfd_fcntl+0x4bc/0x1750 [ 48.929844] [ 48.929844] stack backtrace: [ 48.934328] CPU: 1 PID: 7416 Comm: syz-executor868 Not tainted 4.19.81 #0 [ 48.941231] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.950623] Call Trace: [ 48.953201] dump_stack+0x172/0x1f0 [ 48.956815] lockdep_rcu_suspicious+0x153/0x15d [ 48.961475] memfd_fcntl+0xfdf/0x1750 [ 48.965260] ? vfs_write+0x2f0/0x560 [ 48.968956] ? find_held_lock+0x35/0x130 [ 48.972999] ? vfs_write+0x2f0/0x560 [ 48.976700] ? memfd_file_seals_ptr+0x160/0x160 [ 48.981391] ? check_preemption_disabled+0x48/0x290 [ 48.986400] do_fcntl+0x200/0x1020 [ 48.989925] ? f_getown+0xc0/0xc0 [ 48.993359] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.998881] ? ksys_write+0x1f1/0x2d0 [ 49.002662] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 49.007837] ? selinux_file_fcntl+0x74/0x140 [ 49.012228] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.017745] ? security_file_fcntl+0x8d/0xc0 [ 49.022153] __x64_sys_fcntl+0x16d/0x1e0 [ 49.026202] do_syscall_64+0xfd/0x620 [ 49.029987] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 49.035161] RIP: 0033:0x440159 [ 49.038336] 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 [ 49.057220] RSP: 002b:00007ffc5f3ed958 EFLAGS: 00000246 ORIG_RAX: 0000000000000048 [ 49.064910] RA