[....] 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: [ 36.214146] random: sshd: uninitialized urandom read (32 bytes read) [ 36.620633] audit: type=1400 audit(1537567376.998:6): avc: denied { map } for pid=1791 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 [ 36.668080] random: sshd: uninitialized urandom read (32 bytes read) [ 37.171231] random: sshd: uninitialized urandom read (32 bytes read) [ 37.327666] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.3' (ECDSA) to the list of known hosts. [ 42.877319] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program [ 42.972427] audit: type=1400 audit(1537567383.348:7): avc: denied { map } for pid=1803 comm="syz-executor568" path="/root/syz-executor568603133" 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 [ 43.845132] ------------[ cut here ]------------ [ 43.849952] WARNING: CPU: 1 PID: 1867 at fs/direct-io.c:293 dio_complete+0x578/0x800 [ 43.857958] Kernel panic - not syncing: panic_on_warn set ... [ 43.857958] [ 43.857966] CPU: 1 PID: 1867 Comm: syz-executor568 Not tainted 4.14.71+ #8 [ 43.857969] Call Trace: [ 43.857983] dump_stack+0xb9/0x11b [ 43.857997] ? dio_complete+0x510/0x800 [ 43.858005] panic+0x1bf/0x3a4 [ 43.858013] ? add_taint.cold.4+0x16/0x16 [ 43.858026] ? __probe_kernel_read+0x163/0x1c0 [ 43.858041] ? dio_complete+0x578/0x800 [ 43.858048] __warn.cold.7+0x148/0x185 [ 43.858057] ? dio_complete+0x578/0x800 [ 43.858067] report_bug+0x1f7/0x26c [ 43.858083] do_error_trap+0x1ba/0x2c0 [ 43.858092] ? math_error+0x2d0/0x2d0 [ 43.858100] ? clear_shadow_entry+0x190/0x190 [ 43.858122] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 43.858138] invalid_op+0x18/0x40 [ 43.858146] RIP: 0010:dio_complete+0x578/0x800 [ 43.858151] RSP: 0018:ffff8801cf13f070 EFLAGS: 00010297 [ 43.858158] RAX: ffff8801cf099780 RBX: ffff8801cf0a1380 RCX: 0000000000000000 [ 43.858163] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8801cf0997a4 [ 43.858167] RBP: 0000000000010000 R08: 1ffff1003a51ee00 R09: 0000000000000000 [ 43.858172] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801c3896d20 [ 43.858176] R13: 0000000000010000 R14: 0000000000000002 R15: ffff8801cf0a1418 [ 43.858204] ? ext4_update_bh_state+0xe0/0xe0 [ 43.858217] __blockdev_direct_IO+0x7614/0xc4e0 [ 43.858252] ? sb_init_dio_done_wq+0x70/0x70 [ 43.858270] ? trace_hardirqs_on+0x10/0x10 [ 43.858303] ? ext4_dio_get_block_unwritten_async+0x1b0/0x1b0 [ 43.858331] ? ext4_dio_get_block_unwritten_async+0x1b0/0x1b0 [ 43.858341] ext4_direct_IO+0x905/0x27f0 [ 43.858362] ? __filemap_fdatawait_range+0x1c2/0x260 [ 43.858372] ? ext4_da_write_begin+0x1050/0x1050 [ 43.858413] ? filemap_check_errors+0x8b/0xb0 [ 43.858427] generic_file_direct_write+0x225/0x430 [ 43.858443] __generic_file_write_iter+0x213/0x540 [ 43.858452] ? generic_write_checks+0x252/0x410 [ 43.858465] ext4_file_write_iter+0x4f6/0xe20 [ 43.858479] ? ext4_file_mmap+0x1a0/0x1a0 [ 43.858494] ? kasan_kmalloc.part.1+0xa9/0xd0 [ 43.858504] ? kasan_kmalloc.part.1+0x4f/0xd0 [ 43.858510] ? __kmalloc+0x153/0x340 [ 43.858517] ? iter_file_splice_write+0x142/0xab0 [ 43.858524] ? direct_splice_actor+0x116/0x160 [ 43.858530] ? splice_direct_to_actor+0x28c/0x750 [ 43.858536] ? do_splice_direct+0x17b/0x220 [ 43.858559] do_iter_readv_writev+0x3a4/0x560 [ 43.858572] ? clone_verify_area+0x1e0/0x1e0 [ 43.858586] ? security_file_permission+0x88/0x1e0 [ 43.858603] do_iter_write+0x156/0x530 [ 43.858614] ? kasan_unpoison_shadow+0x30/0x40 [ 43.858623] ? kasan_kmalloc+0x76/0xc0 [ 43.858637] vfs_iter_write+0x70/0xa0 [ 43.858648] iter_file_splice_write+0x5b4/0xab0 [ 43.858670] ? vmsplice_to_user+0x1e0/0x1e0 [ 43.858686] ? avc_policy_seqno+0x5/0x10 [ 43.858706] ? vmsplice_to_user+0x1e0/0x1e0 [ 43.858717] direct_splice_actor+0x116/0x160 [ 43.858730] splice_direct_to_actor+0x28c/0x750 [ 43.858742] ? pipe_to_sendpage+0x300/0x300 [ 43.858755] ? do_splice_to+0x150/0x150 [ 43.858764] ? security_file_permission+0x88/0x1e0 [ 43.858781] do_splice_direct+0x17b/0x220 [ 43.858791] ? splice_direct_to_actor+0x750/0x750 [ 43.858808] ? rcu_read_lock_sched_held+0x102/0x120 [ 43.858829] do_sendfile+0x4a1/0xb50 [ 43.858848] ? do_compat_pwritev64+0x170/0x170 [ 43.858855] ? __might_fault+0xd4/0x1b0 [ 43.858872] ? __might_fault+0x177/0x1b0 [ 43.858886] SyS_sendfile64+0xab/0x140 [ 43.858895] ? SyS_sendfile+0x150/0x150 [ 43.858906] ? do_syscall_64+0x43/0x4b0 [ 43.858915] ? SyS_sendfile+0x150/0x150 [ 43.858923] do_syscall_64+0x19b/0x4b0 [ 43.858939] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 43.858944] RIP: 0033:0x446379 [ 43.858948] RSP: 002b:00007fc536527da8 EFLAGS: 00000297 ORIG_RAX: 0000000000000028 [ 43.858955] RAX: ffffffffffffffda RBX: 00000000006dac48 RCX: 0000000000446379 [ 43.858960] RDX: 0000000020d83ff8 RSI: 0000000000000008 RDI: 0000000000000006 [ 43.858964] RBP: 00000000006dac40 R08: 0000000000000000 R09: 0000000000000000 [ 43.858969] R10: 00008000fffffffe R11: 0000000000000297 R12: 00000000006dac4c [ 43.858973] R13: 00008000fffffffe R14: 00007fc5365289c0 R15: 00000000006dad4c [ 43.865618] Kernel Offset: 0x8c00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 44.261054] Rebooting in 86400 seconds..