[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 11.432544] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.990834] random: sshd: uninitialized urandom read (32 bytes read) [ 16.207196] audit: type=1400 audit(1572435625.455:6): avc: denied { map } for pid=1767 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 [ 16.254066] random: sshd: uninitialized urandom read (32 bytes read) [ 16.764255] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.218' (ECDSA) to the list of known hosts. [ 22.376277] urandom_read: 1 callbacks suppressed [ 22.376282] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 22.470657] audit: type=1400 audit(1572435631.725:7): avc: denied { map } for pid=1785 comm="syz-executor603" path="/root/syz-executor603474564" dev="sda1" ino=16482 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 22.472586] [ 22.498522] ============================= [ 22.502699] WARNING: suspicious RCU usage [ 22.506828] 4.14.151+ #0 Not tainted [ 22.510511] ----------------------------- [ 22.514665] ./include/linux/radix-tree.h:238 suspicious rcu_dereference_check() usage! [ 22.522743] [ 22.522743] other info that might help us debug this: [ 22.522743] [ 22.530863] [ 22.530863] rcu_scheduler_active = 2, debug_locks = 1 [ 22.537514] 2 locks held by syz-executor603/1785: [ 22.542330] #0: (&sb->s_type->i_mutex_key#10){+.+.}, at: [< (ptrval)>] shmem_add_seals+0x12b/0xf80 [ 22.552217] #1: (&(&mapping->tree_lock)->rlock){-.-.}, at: [< (ptrval)>] shmem_add_seals+0x2e1/0xf80 [ 22.562268] [ 22.562268] stack backtrace: [ 22.566749] CPU: 1 PID: 1785 Comm: syz-executor603 Not tainted 4.14.151+ #0 [ 22.573818] Call Trace: [ 22.576387] dump_stack+0xca/0x134 [ 22.579943] shmem_add_seals+0x9d2/0xf80 [ 22.583987] ? shmem_file_llseek+0x220/0x220 [ 22.588375] ? vfs_write+0x35d/0x4d0 [ 22.592068] ? check_preemption_disabled+0x35/0x1f0 [ 22.597061] shmem_fcntl+0xea/0x120 [ 22.600666] do_fcntl+0x5c8/0xd20 [ 22.604094] ? f_getown+0xa0/0xa0 [ 22.607558] ? vfs_write+0x319/0x4d0 [ 22.611325] ? selinux_file_fcntl+0x86/0x140 [ 22.615726] SyS_fcntl+0xc6/0x100 [ 22.619166] ? do_fcntl+0xd20/0xd20 [ 22.622780] do_syscall_64+0x19b/0x520 [ 22.626660] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 22.631828] RIP: 0033:0x440189 [ 22.634994] RSP: 002b:00007ffdde77c7f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000048 [ 22.642702] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440189 [ 22.649960] RDX: 0000000000000008 RSI: 0000000000000409 RDI: 0000000000000003 [ 22.657204] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 22.664450] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a10