[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.695028] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.786948] random: sshd: uninitialized urandom read (32 bytes read) [ 22.241115] random: sshd: uninitialized urandom read (32 bytes read) [ 22.730690] random: sshd: uninitialized urandom read (32 bytes read) [ 22.919275] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.4' (ECDSA) to the list of known hosts. [ 28.525030] random: sshd: uninitialized urandom read (32 bytes read) 2018/09/04 00:12:35 parsed 1 programs [ 29.593711] random: cc1: uninitialized urandom read (8 bytes read) 2018/09/04 00:12:36 executed programs: 0 [ 33.415661] ------------[ cut here ]------------ [ 33.420462] WARNING: CPU: 0 PID: 2431 at fs/direct-io.c:293 dio_complete+0x578/0x800 [ 33.428314] Kernel panic - not syncing: panic_on_warn set ... [ 33.428314] [ 33.435669] CPU: 0 PID: 2431 Comm: syz-executor0 Not tainted 4.14.67+ #1 [ 33.442491] Call Trace: [ 33.445054] dump_stack+0xb9/0x11b [ 33.448577] ? dio_complete+0x4c0/0x800 [ 33.452558] panic+0x1bf/0x3a4 [ 33.455725] ? add_taint.cold.4+0x16/0x16 [ 33.459862] ? __probe_kernel_read+0x163/0x1c0 [ 33.464434] ? dio_complete+0x578/0x800 [ 33.468380] __warn.cold.7+0x148/0x185 [ 33.472329] ? dio_complete+0x578/0x800 [ 33.476281] report_bug+0x1f7/0x26c [ 33.479885] do_error_trap+0x1ba/0x2c0 [ 33.483751] ? math_error+0x2d0/0x2d0 [ 33.487524] ? clear_shadow_entry+0x190/0x190 [ 33.492003] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.496825] invalid_op+0x18/0x40 [ 33.500253] RIP: 0010:dio_complete+0x578/0x800 [ 33.504808] RSP: 0018:ffff8801b5d17070 EFLAGS: 00010297 [ 33.510155] RAX: ffff8801b6760000 RBX: ffff8801c1a60d00 RCX: 0000000000000000 [ 33.517410] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8801b6760024 [ 33.524655] RBP: 0000000000010000 R08: 1ffff100387dd000 R09: 0000000000000000 [ 33.531900] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801be2c9c30 [ 33.539140] R13: 0000000000010000 R14: 0000000000000002 R15: ffff8801c1a60d98 [ 33.546402] ? ext4_update_bh_state+0xe0/0xe0 [ 33.550877] __blockdev_direct_IO+0x7614/0xc4e0 [ 33.555542] ? sb_init_dio_done_wq+0x70/0x70 [ 33.559927] ? trace_hardirqs_on+0x10/0x10 [ 33.564149] ? ext4_dio_get_block_unwritten_async+0x1b0/0x1b0 [ 33.570024] ? ext4_dio_get_block_unwritten_async+0x1b0/0x1b0 [ 33.575926] ext4_direct_IO+0x905/0x27f0 [ 33.579970] ? __filemap_fdatawait_range+0x1c2/0x260 [ 33.585049] ? ext4_da_write_begin+0x1050/0x1050 [ 33.589822] ? current_time+0x89/0xb0 [ 33.593617] ? filemap_check_errors+0x8b/0xb0 [ 33.598088] generic_file_direct_write+0x225/0x430 [ 33.602999] __generic_file_write_iter+0x213/0x540 [ 33.607905] ? generic_write_checks+0x252/0x410 [ 33.612550] ext4_file_write_iter+0x4f6/0xe20 [ 33.617025] ? ext4_file_mmap+0x1a0/0x1a0 [ 33.621152] ? kasan_kmalloc.part.1+0xa9/0xd0 [ 33.625625] ? kasan_kmalloc.part.1+0x4f/0xd0 [ 33.630093] ? __kmalloc+0x153/0x340 [ 33.633779] ? iter_file_splice_write+0x142/0xab0 [ 33.638601] ? direct_splice_actor+0x116/0x160 [ 33.643155] ? splice_direct_to_actor+0x28c/0x750 [ 33.647968] ? do_splice_direct+0x17b/0x220 [ 33.652275] do_iter_readv_writev+0x3a4/0x560 [ 33.656760] ? clone_verify_area+0x1e0/0x1e0 [ 33.661167] ? security_file_permission+0x88/0x1e0 [ 33.666080] do_iter_write+0x156/0x530 [ 33.669944] ? kasan_unpoison_shadow+0x30/0x40 [ 33.674499] ? kasan_kmalloc+0x76/0xc0 [ 33.678363] vfs_iter_write+0x70/0xa0 [ 33.682138] iter_file_splice_write+0x5b4/0xab0 [ 33.686789] ? vmsplice_to_user+0x1e0/0x1e0 [ 33.691099] ? avc_policy_seqno+0x5/0x10 [ 33.695137] ? vmsplice_to_user+0x1e0/0x1e0 [ 33.699434] direct_splice_actor+0x116/0x160 [ 33.703820] splice_direct_to_actor+0x28c/0x750 [ 33.708462] ? pipe_to_sendpage+0x300/0x300 [ 33.712762] ? do_splice_to+0x150/0x150 [ 33.716710] ? security_file_permission+0x88/0x1e0 [ 33.721617] do_splice_direct+0x17b/0x220 [ 33.725740] ? splice_direct_to_actor+0x750/0x750 [ 33.730564] ? rcu_read_lock_sched_held+0x102/0x120 [ 33.735579] do_sendfile+0x4a1/0xb50 [ 33.739272] ? do_compat_pwritev64+0x170/0x170 [ 33.743829] ? __might_fault+0xd4/0x1b0 [ 33.747779] ? __might_fault+0x177/0x1b0 [ 33.751827] SyS_sendfile64+0xab/0x140 [ 33.755687] ? SyS_sendfile+0x150/0x150 [ 33.759636] ? do_syscall_64+0x43/0x4b0 [ 33.763587] ? SyS_sendfile+0x150/0x150 [ 33.767534] do_syscall_64+0x19b/0x4b0 [ 33.771404] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 33.776565] RIP: 0033:0x457099 [ 33.779728] RSP: 002b:00007fe35e6d4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 [ 33.787412] RAX: ffffffffffffffda RBX: 00007fe35e6d56d4 RCX: 0000000000457099 [ 33.794666] RDX: 0000000020d83ff8 RSI: 000000000000000e RDI: 000000000000000c [ 33.801911] RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 [ 33.809156] R10: 00008000fffffffe R11: 0000000000000246 R12: 00000000ffffffff [ 33.816689] R13: 00000000004d4428 R14: 00000000004c8b10 R15: 0000000000000000 [ 33.824355] Dumping ftrace buffer: [ 33.827957] (ftrace buffer empty) [ 33.831649] Kernel Offset: 0x3aa00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 33.842545] Rebooting in 86400 seconds..