[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c[ 12.526532] random: sshd: uninitialized urandom read (32 bytes read) . [ 12.753598] audit: type=1400 audit(1572738124.890:6): avc: denied { map } for pid=1756 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 [ 12.797881] random: sshd: uninitialized urandom read (32 bytes read) [ 13.504977] urandom_read: 1 callbacks suppressed [ 13.504981] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.3' (ECDSA) to the list of known hosts. syzkaller login: [ 19.003373] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 19.109748] audit: type=1400 audit(1572738131.240:7): avc: denied { map } for pid=1768 comm="syz-executor855" path="/root/syz-executor855943957" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 19.113025] [ 19.138302] ============================= [ 19.142442] WARNING: suspicious RCU usage [ 19.146765] 4.14.151+ #0 Not tainted [ 19.150459] ----------------------------- [ 19.154593] ./include/linux/radix-tree.h:238 suspicious rcu_dereference_check() usage! [ 19.162625] [ 19.162625] other info that might help us debug this: [ 19.162625] [ 19.170760] [ 19.170760] rcu_scheduler_active = 2, debug_locks = 1 [ 19.177422] 2 locks held by syz-executor855/1768: [ 19.182247] #0: (&sb->s_type->i_mutex_key#10){+.+.}, at: [< (ptrval)>] shmem_add_seals+0x12b/0xf80 [ 19.192333] #1: (&(&mapping->tree_lock)->rlock){-...}, at: [< (ptrval)>] shmem_add_seals+0x2e1/0xf80 [ 19.202482] [ 19.202482] stack backtrace: [ 19.207010] CPU: 0 PID: 1768 Comm: syz-executor855 Not tainted 4.14.151+ #0 [ 19.214102] Call Trace: [ 19.216705] dump_stack+0xca/0x134 [ 19.220326] shmem_add_seals+0x9d2/0xf80 [ 19.224379] ? shmem_file_llseek+0x220/0x220 [ 19.228788] ? vfs_write+0x35d/0x4d0 [ 19.232623] ? check_preemption_disabled+0x35/0x1f0 [ 19.237657] shmem_fcntl+0xea/0x120 [ 19.241351] do_fcntl+0x5c8/0xd20 [ 19.244820] ? f_getown+0xa0/0xa0 [ 19.248285] ? vfs_write+0x319/0x4d0 [ 19.251995] ? selinux_file_fcntl+0x86/0x140 [ 19.256547] SyS_fcntl+0xc6/0x100 [ 19.260031] ? do_fcntl+0xd20/0xd20 [ 19.263965] do_syscall_64+0x19b/0x520 [ 19.267860] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 19.273047] RIP: 0033:0x440199 [ 19.276355] RSP: 002b:00007ffefda4f858 EFLAGS: 00000246 ORIG_RAX: 0000000000000048 [ 19.284057] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440199 [ 19.291322] RDX: 0000000000000008 RSI: 0000000000000409 RDI: 0000000000000003 [ 19.298760] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 19.306278] R10: 0000000000000000 R11: 0000000000