[....] 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 syzkaller login: [ 31.367337] random: sshd: uninitialized urandom read (32 bytes read) [ 31.769538] audit: type=1400 audit(1542755947.186:6): avc: denied { map } for pid=1770 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 [ 31.812753] random: sshd: uninitialized urandom read (32 bytes read) [ 32.242917] random: sshd: uninitialized urandom read (32 bytes read) [ 40.967641] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.65' (ECDSA) to the list of known hosts. [ 46.491775] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 46.579504] audit: type=1400 audit(1542755961.996:7): avc: denied { map } for pid=1788 comm="syz-executor579" path="/root/syz-executor579173631" 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 60.974328] ------------[ cut here ]------------ [ 60.979141] WARNING: CPU: 0 PID: 1793 at fs/direct-io.c:293 dio_complete+0x578/0x800 [ 60.986996] Kernel panic - not syncing: panic_on_warn set ... [ 60.986996] [ 60.994334] CPU: 0 PID: 1793 Comm: kworker/0:2 Not tainted 4.14.81+ #6 [ 61.000973] Workqueue: dio/sda1 dio_aio_complete_work [ 61.006143] Call Trace: [ 61.008705] dump_stack+0xb9/0x11b [ 61.012221] ? dio_complete+0x520/0x800 [ 61.016170] panic+0x1bf/0x3a4 [ 61.019339] ? add_taint.cold.4+0x16/0x16 [ 61.023469] ? __probe_kernel_read+0x163/0x1c0 [ 61.028032] ? dio_complete+0x578/0x800 [ 61.031984] __warn.cold.7+0x2f/0x35 [ 61.035674] ? dio_complete+0x578/0x800 [ 61.039669] report_bug+0x1f7/0x26c [ 61.043284] do_error_trap+0x1ba/0x2c0 [ 61.047150] ? math_error+0x2d0/0x2d0 [ 61.050927] ? clear_shadow_entry+0x190/0x190 [ 61.055411] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 61.060247] invalid_op+0x18/0x40 [ 61.063674] RIP: 0010:dio_complete+0x578/0x800 [ 61.068228] RSP: 0018:ffff8801cb437d10 EFLAGS: 00010297 [ 61.073566] RAX: ffff8801ceb24680 RBX: ffff8801c9a43400 RCX: 0000000000000000 [ 61.080911] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8801ceb246a4 [ 61.088314] RBP: 0000000000010000 R08: 0000000000000001 R09: 0000000000000000 [ 61.095561] R10: ffff8801ceb24f00 R11: 0000000000000001 R12: ffff8801c0479c30 [ 61.102804] R13: 0000000000010000 R14: 0000000000000003 R15: ffff8801c9a43498 [ 61.110068] ? ext4_update_bh_state+0xe0/0xe0 [ 61.114543] process_one_work+0x86e/0x1670 [ 61.118759] ? pwq_dec_nr_in_flight+0x2b0/0x2b0 [ 61.123415] worker_thread+0xdc/0x1000 [ 61.127284] ? process_one_work+0x1670/0x1670 [ 61.131753] ? process_one_work+0x1670/0x1670 [ 61.136222] kthread+0x348/0x420 [ 61.139563] ? kthread_create_on_node+0xe0/0xe0 [ 61.144222] ret_from_fork+0x3a/0x50 [ 61.148307] Kernel Offset: 0x3800000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 61.159123] Rebooting in 86400 seconds..