[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.427484] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.852061] random: sshd: uninitialized urandom read (32 bytes read) [ 20.112957] random: sshd: uninitialized urandom read (32 bytes read) [ 20.603475] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.15' (ECDSA) to the list of known hosts. [ 26.246447] urandom_read: 1 callbacks suppressed [ 26.246451] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program [ 26.362320] ------------[ cut here ]------------ [ 26.367173] WARNING: CPU: 1 PID: 1988 at fs/direct-io.c:293 dio_complete+0x578/0x800 [ 26.375047] Kernel panic - not syncing: panic_on_warn set ... [ 26.375047] [ 26.382398] CPU: 1 PID: 1988 Comm: syz-executor818 Not tainted 4.14.67+ #1 [ 26.389397] Call Trace: [ 26.391988] dump_stack+0xb9/0x11b [ 26.395529] ? dio_complete+0x4c0/0x800 [ 26.399487] panic+0x1bf/0x3a4 [ 26.402668] ? add_taint.cold.4+0x16/0x16 [ 26.406814] ? __probe_kernel_read+0x163/0x1c0 [ 26.411381] ? dio_complete+0x578/0x800 [ 26.415342] __warn.cold.7+0x148/0x185 [ 26.419223] ? dio_complete+0x578/0x800 [ 26.423179] report_bug+0x1f7/0x26c [ 26.426788] do_error_trap+0x1ba/0x2c0 [ 26.430653] ? math_error+0x2d0/0x2d0 [ 26.434435] ? clear_shadow_entry+0x190/0x190 [ 26.438922] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.443765] invalid_op+0x18/0x40 [ 26.447212] RIP: 0010:dio_complete+0x578/0x800 [ 26.451769] RSP: 0018:ffff8801ba31f070 EFLAGS: 00010297 [ 26.457119] RAX: ffff8801d2339780 RBX: ffff8801c6745040 RCX: 0000000000000000 [ 26.464366] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8801d23397a4 [ 26.471611] RBP: 0000000000010000 R08: 1ffff100386ddc00 R09: 0000000000000000 [ 26.478863] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801c6020c00 [ 26.486115] R13: 0000000000010000 R14: 0000000000000002 R15: ffff8801c67450d8 [ 26.493383] ? ext4_update_bh_state+0xe0/0xe0 [ 26.497863] __blockdev_direct_IO+0x7614/0xc4e0 [ 26.502525] ? sb_init_dio_done_wq+0x70/0x70 [ 26.506918] ? splice_direct_to_actor+0x28c/0x750 [ 26.511742] ? mark_held_locks+0xc2/0x130 [ 26.515869] ? _raw_spin_unlock_irqrestore+0x54/0x70 [ 26.520954] ? trace_hardirqs_on_caller+0x381/0x520 [ 26.525968] ? ext4_dio_get_block_unwritten_async+0x1b0/0x1b0 [ 26.531839] ? kmem_cache_free+0x2cd/0x350 [ 26.536098] ? ext4_dio_get_block_unwritten_async+0x1b0/0x1b0 [ 26.542078] ext4_direct_IO+0x905/0x27f0 [ 26.546135] ? ext4_da_write_begin+0x1050/0x1050 [ 26.550867] ? jbd2__journal_start+0xf4/0x8b0 [ 26.555349] ? ext4_setattr+0x2280/0x2280 [ 26.559533] ? rcu_read_lock_sched_held+0x102/0x120 [ 26.564532] ? __mark_inode_dirty+0x15b/0x1060 [ 26.569168] ? current_kernel_time64+0x101/0x120 [ 26.573914] ? inode_dio_wait+0x220/0x220 [ 26.578045] ? generic_update_time+0x1a5/0x270 [ 26.582606] ? preempt_count_add+0x7d/0x130 [ 26.586908] ? __mnt_drop_write+0x40/0x70 [ 26.591040] ? filemap_check_errors+0x8b/0xb0 [ 26.595519] generic_file_direct_write+0x225/0x430 [ 26.600431] __generic_file_write_iter+0x213/0x540 [ 26.605336] ? generic_write_checks+0x252/0x410 [ 26.609984] ext4_file_write_iter+0x4f6/0xe20 [ 26.614466] ? ext4_file_mmap+0x1a0/0x1a0 [ 26.618607] ? kasan_kmalloc.part.1+0xa9/0xd0 [ 26.623088] ? kasan_kmalloc.part.1+0x4f/0xd0 [ 26.627564] ? __kmalloc+0x153/0x340 [ 26.631264] ? iter_file_splice_write+0x142/0xab0 [ 26.636085] ? direct_splice_actor+0x116/0x160 [ 26.640641] ? splice_direct_to_actor+0x28c/0x750 [ 26.648415] ? do_splice_direct+0x17b/0x220 [ 26.652739] do_iter_readv_writev+0x3a4/0x560 [ 26.657218] ? clone_verify_area+0x1e0/0x1e0 [ 26.661605] ? security_file_permission+0x88/0x1e0 [ 26.666519] do_iter_write+0x156/0x530 [ 26.670385] ? kasan_unpoison_shadow+0x30/0x40 [ 26.674943] ? kasan_kmalloc+0x76/0xc0 [ 26.678809] vfs_iter_write+0x70/0xa0 [ 26.682587] iter_file_splice_write+0x5b4/0xab0 [ 26.687237] ? vmsplice_to_user+0x1e0/0x1e0 [ 26.691544] ? avc_policy_seqno+0x5/0x10 [ 26.695595] ? vmsplice_to_user+0x1e0/0x1e0 [ 26.699896] direct_splice_actor+0x116/0x160 [ 26.704291] splice_direct_to_actor+0x28c/0x750 [ 26.708938] ? pipe_to_sendpage+0x300/0x300 [ 26.713281] ? do_splice_to+0x150/0x150 [ 26.717399] ? security_file_permission+0x88/0x1e0 [ 26.722313] do_splice_direct+0x17b/0x220 [ 26.726439] ? splice_direct_to_actor+0x750/0x750 [ 26.731268] ? rcu_read_lock_sched_held+0x102/0x120 [ 26.736264] do_sendfile+0x4a1/0xb50 [ 26.739960] ? do_compat_pwritev64+0x170/0x170 [ 26.744537] ? __might_fault+0xd4/0x1b0 [ 26.748501] ? __might_fault+0x177/0x1b0 [ 26.752545] SyS_sendfile64+0xab/0x140 [ 26.756416] ? SyS_sendfile+0x150/0x150 [ 26.760374] ? do_syscall_64+0x43/0x4b0 [ 26.764325] ? SyS_sendfile+0x150/0x150 [ 26.768272] do_syscall_64+0x19b/0x4b0 [ 26.772143] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 26.777307] RIP: 0033:0x446629 [ 26.780471] RSP: 002b:00007feb4cf20d18 EFLAGS: 00000297 ORIG_RAX: 0000000000000028 [ 26.788158] RAX: ffffffffffffffda RBX: 00000000006dbc68 RCX: 0000000000446629 [ 26.795407] RDX: 0000000020d83ff8 RSI: 0000000000000006 RDI: 0000000000000004 [ 26.802650] RBP: 00000000006dbc60 R08: 65732f636f72702f R09: 65732f636f72702f [ 26.809899] R10: 00008000fffffffe R11: 0000000000000297 R12: 00000000006dbc6c [ 26.817156] R13: 00007feb4cf20d20 R14: 6374722f7665642f R15: 0000000000000000 [ 26.824770] Dumping ftrace buffer: [ 26.828377] (ftrace buffer empty) [ 26.832074] Kernel Offset: 0x9600000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 26.842891] Rebooting in 86400 seconds..