[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.071776] random: sshd: uninitialized urandom read (32 bytes read) [ 26.566571] audit: type=1400 audit(1543666614.954:6): avc: denied { map } for pid=1771 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 [ 26.599827] random: sshd: uninitialized urandom read (32 bytes read) [ 27.045189] random: sshd: uninitialized urandom read (32 bytes read) [ 27.207435] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.118' (ECDSA) to the list of known hosts. [ 32.852812] random: sshd: uninitialized urandom read (32 bytes read) 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 [ 32.942025] audit: type=1400 audit(1543666621.334:7): avc: denied { map } for pid=1789 comm="syz-executor756" path="/root/syz-executor756430238" 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 executing program executing program executing program executing program executing program [ 33.027120] audit: type=1400 audit(1543666621.414:8): avc: denied { map } for pid=1822 comm="sh" path="/bin/dash" dev="sda1" ino=1473 scontext=system_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_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 [ 33.308812] ------------[ cut here ]------------ [ 33.313645] WARNING: CPU: 1 PID: 1885 at fs/direct-io.c:293 dio_complete+0x578/0x800 [ 33.321505] Kernel panic - not syncing: panic_on_warn set ... [ 33.321505] [ 33.328916] CPU: 1 PID: 1885 Comm: syz-executor756 Not tainted 4.14.85+ #15 [ 33.335998] Call Trace: [ 33.338568] dump_stack+0xb9/0x11b [ 33.342085] ? dio_complete+0x4a0/0x800 [ 33.346037] panic+0x1bf/0x3a4 [ 33.349216] ? add_taint.cold.4+0x16/0x16 [ 33.353459] ? __probe_kernel_read+0x163/0x1c0 [ 33.358127] ? dio_complete+0x578/0x800 [ 33.362090] __warn.cold.7+0x2f/0x35 [ 33.365778] ? dio_complete+0x578/0x800 [ 33.369730] report_bug+0x1f7/0x26c [ 33.373433] do_error_trap+0x1ba/0x2c0 [ 33.377306] ? math_error+0x2d0/0x2d0 [ 33.381217] ? clear_shadow_entry+0x190/0x190 [ 33.385697] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.390520] invalid_op+0x18/0x40 [ 33.393952] RIP: 0010:dio_complete+0x578/0x800 [ 33.398508] RSP: 0018:ffff8881c53b7070 EFLAGS: 00010297 [ 33.403849] RAX: ffff8881ce1b4680 RBX: ffff8881cf1af740 RCX: 0000000000000000 [ 33.411244] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881ce1b46a4 [ 33.418497] RBP: 0000000000010000 R08: 1ffff11021ee8c00 R09: 0000000000000000 [ 33.425845] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881c4026508 [ 33.433202] R13: 0000000000010000 R14: 0000000000000002 R15: ffff8881cf1af7d8 [ 33.440661] ? ext4_update_bh_state+0xe0/0xe0 [ 33.445147] __blockdev_direct_IO+0x7614/0xc4e0 [ 33.449882] ? sb_init_dio_done_wq+0x70/0x70 [ 33.454287] ? _raw_spin_unlock_irqrestore+0x54/0x70 [ 33.459377] ? trace_hardirqs_on_caller+0x381/0x520 [ 33.464387] ? __lock_acquire+0x619/0x4320 [ 33.468606] ? ext4_dio_get_block_unwritten_async+0x1b0/0x1b0 [ 33.474518] ? trace_hardirqs_on+0x10/0x10 [ 33.478739] ? ext4_dio_get_block_unwritten_async+0x1b0/0x1b0 [ 33.484606] ext4_direct_IO+0x905/0x27f0 [ 33.488720] ? ext4_da_write_begin+0x1050/0x1050 [ 33.493459] ? current_time+0x16/0xb0 [ 33.497238] ? mark_held_locks+0xc2/0x130 [ 33.501501] ? timespec_trunc+0xc9/0x140 [ 33.505648] ? put_itimerspec64+0x1b0/0x1b0 [ 33.509948] ? current_kernel_time64+0x101/0x120 [ 33.514794] ? current_time+0x89/0xb0 [ 33.518589] ? filemap_check_errors+0x8b/0xb0 [ 33.523179] generic_file_direct_write+0x225/0x430 [ 33.528203] __generic_file_write_iter+0x213/0x540 [ 33.533262] ? generic_write_checks+0x252/0x410 [ 33.538143] ext4_file_write_iter+0x4f6/0xe20 [ 33.542618] ? ext4_file_mmap+0x1a0/0x1a0 [ 33.546949] ? kasan_kmalloc.part.1+0xa9/0xd0 [ 33.551427] ? kasan_kmalloc.part.1+0x4f/0xd0 [ 33.555899] ? __kmalloc+0x153/0x340 [ 33.559591] ? iter_file_splice_write+0x142/0xab0 [ 33.564406] ? direct_splice_actor+0x116/0x160 [ 33.569020] ? splice_direct_to_actor+0x28c/0x750 [ 33.573851] ? do_splice_direct+0x17b/0x220 [ 33.578169] do_iter_readv_writev+0x3a4/0x560 [ 33.582646] ? clone_verify_area+0x1e0/0x1e0 [ 33.587035] ? security_file_permission+0x88/0x1e0 [ 33.592042] do_iter_write+0x156/0x530 [ 33.595963] ? kasan_unpoison_shadow+0x30/0x40 [ 33.600527] ? kasan_kmalloc+0x76/0xc0 [ 33.604392] vfs_iter_write+0x70/0xa0 [ 33.608168] iter_file_splice_write+0x5b4/0xab0 [ 33.612841] ? vmsplice_to_user+0x1e0/0x1e0 [ 33.617155] ? avc_policy_seqno+0x5/0x10 [ 33.621203] ? vmsplice_to_user+0x1e0/0x1e0 [ 33.625609] direct_splice_actor+0x116/0x160 [ 33.630000] splice_direct_to_actor+0x28c/0x750 [ 33.634717] ? pipe_to_sendpage+0x300/0x300 [ 33.639027] ? do_splice_to+0x150/0x150 [ 33.642980] ? security_file_permission+0x88/0x1e0 [ 33.647894] do_splice_direct+0x17b/0x220 [ 33.652125] ? splice_direct_to_actor+0x750/0x750 [ 33.657060] ? rcu_read_lock_sched_held+0x102/0x120 [ 33.662198] do_sendfile+0x4a1/0xb50 [ 33.665914] ? do_compat_pwritev64+0x170/0x170 [ 33.670483] ? kmem_cache_free+0x2cd/0x350 [ 33.674703] ? SyS_futex+0x1b7/0x2b5 [ 33.678398] SyS_sendfile64+0x11f/0x140 [ 33.682348] ? SyS_sendfile+0x150/0x150 [ 33.686301] ? do_syscall_64+0x43/0x4b0 [ 33.690271] ? SyS_sendfile+0x150/0x150 [ 33.694276] do_syscall_64+0x19b/0x4b0 [ 33.698151] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 33.703322] RIP: 0033:0x446609 [ 33.706489] RSP: 002b:00007f0597498da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 [ 33.714225] RAX: ffffffffffffffda RBX: 00000000006dbc48 RCX: 0000000000446609 [ 33.721476] RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003 [ 33.728722] RBP: 00000000006dbc40 R08: 0000000000000000 R09: 0000000000000000 [ 33.735973] R10: 00008000fffffffe R11: 0000000000000246 R12: 00000000006dbc4c [ 33.743322] R13: 0000040000006100 R14: 00008000fffffffe R15: 0000000000000000 [ 33.750988] Kernel Offset: 0x11200000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 33.762002] Rebooting in 86400 seconds..