[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.060615] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 14.510317] random: sshd: uninitialized urandom read (32 bytes read) [ 14.791691] random: sshd: uninitialized urandom read (32 bytes read) [ 15.238866] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.391210] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.56' (ECDSA) to the list of known hosts. [ 21.067150] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program [ 21.247754] ------------[ cut here ]------------ [ 21.252569] WARNING: CPU: 0 PID: 2017 at fs/direct-io.c:293 dio_complete+0x578/0x800 [ 21.260425] Kernel panic - not syncing: panic_on_warn set ... [ 21.260425] [ 21.267769] CPU: 0 PID: 2017 Comm: syz-executor952 Not tainted 4.14.67+ #1 [ 21.274771] Call Trace: [ 21.277353] dump_stack+0xb9/0x11b [ 21.280899] ? dio_complete+0x4c0/0x800 [ 21.284868] panic+0x1bf/0x3a4 [ 21.288060] ? add_taint.cold.4+0x16/0x16 [ 21.292208] ? __probe_kernel_read+0x163/0x1c0 [ 21.296786] ? dio_complete+0x578/0x800 [ 21.300746] __warn.cold.7+0x148/0x185 [ 21.304618] ? dio_complete+0x578/0x800 [ 21.308574] report_bug+0x1f7/0x26c [ 21.312190] do_error_trap+0x1ba/0x2c0 [ 21.316063] ? math_error+0x2d0/0x2d0 [ 21.319941] ? clear_shadow_entry+0x190/0x190 [ 21.324438] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 21.329288] invalid_op+0x18/0x40 [ 21.332724] RIP: 0010:dio_complete+0x578/0x800 [ 21.337286] RSP: 0018:ffff8801bd677070 EFLAGS: 00010297 [ 21.342636] RAX: ffff8801d111c680 RBX: ffff8801c37e4000 RCX: 0000000000000000 [ 21.349894] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8801d111c6a4 [ 21.357151] RBP: 0000000000010000 R08: 0000000000000001 R09: 0000000000000000 [ 21.364403] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801c2938c00 [ 21.371681] R13: 0000000000010000 R14: 0000000000000002 R15: ffff8801c37e4098 [ 21.378958] ? ext4_update_bh_state+0xe0/0xe0 [ 21.383441] __blockdev_direct_IO+0x7614/0xc4e0 [ 21.388116] ? sb_init_dio_done_wq+0x70/0x70 [ 21.392516] ? trace_hardirqs_on+0x10/0x10 [ 21.396758] ? ext4_dio_get_block_unwritten_async+0x1b0/0x1b0 [ 21.402667] ? ext4_dio_get_block_unwritten_async+0x1b0/0x1b0 [ 21.408539] ext4_direct_IO+0x905/0x27f0 [ 21.412602] ? __filemap_fdatawait_range+0x1c2/0x260 [ 21.417689] ? ext4_da_write_begin+0x1050/0x1050 [ 21.422458] ? filemap_check_errors+0x8b/0xb0 [ 21.426942] generic_file_direct_write+0x225/0x430 [ 21.431909] __generic_file_write_iter+0x213/0x540 [ 21.436826] ? generic_write_checks+0x252/0x410 [ 21.441494] ext4_file_write_iter+0x4f6/0xe20 [ 21.445980] ? ext4_file_mmap+0x1a0/0x1a0 [ 21.450116] ? kasan_kmalloc.part.1+0xa9/0xd0 [ 21.454599] ? kasan_kmalloc.part.1+0x4f/0xd0 [ 21.459082] ? __kmalloc+0x153/0x340 [ 21.462795] ? iter_file_splice_write+0x142/0xab0 [ 21.467620] ? direct_splice_actor+0x116/0x160 [ 21.472182] ? splice_direct_to_actor+0x28c/0x750 [ 21.477020] ? do_splice_direct+0x17b/0x220 [ 21.481335] do_iter_readv_writev+0x3a4/0x560 [ 21.485818] ? clone_verify_area+0x1e0/0x1e0 [ 21.490213] ? security_file_permission+0x88/0x1e0 [ 21.495130] do_iter_write+0x156/0x530 [ 21.499001] ? kasan_unpoison_shadow+0x30/0x40 [ 21.503567] ? kasan_kmalloc+0x76/0xc0 [ 21.507443] vfs_iter_write+0x70/0xa0 [ 21.511232] iter_file_splice_write+0x5b4/0xab0 [ 21.515900] ? vmsplice_to_user+0x1e0/0x1e0 [ 21.520213] ? avc_policy_seqno+0x5/0x10 [ 21.524269] ? vmsplice_to_user+0x1e0/0x1e0 [ 21.528576] direct_splice_actor+0x116/0x160 [ 21.532976] splice_direct_to_actor+0x28c/0x750 [ 21.537660] ? pipe_to_sendpage+0x300/0x300 [ 21.541972] ? do_splice_to+0x150/0x150 [ 21.545932] ? security_file_permission+0x88/0x1e0 [ 21.550856] do_splice_direct+0x17b/0x220 [ 21.554989] ? splice_direct_to_actor+0x750/0x750 [ 21.559839] ? rcu_read_lock_sched_held+0x102/0x120 [ 21.564844] do_sendfile+0x4a1/0xb50 [ 21.568550] ? do_compat_pwritev64+0x170/0x170 [ 21.573136] ? __might_fault+0xd4/0x1b0 [ 21.577128] ? __might_fault+0x177/0x1b0 [ 21.581182] SyS_sendfile64+0xab/0x140 [ 21.585056] ? SyS_sendfile+0x150/0x150 [ 21.589019] ? do_syscall_64+0x43/0x4b0 [ 21.592980] ? SyS_sendfile+0x150/0x150 [ 21.596942] do_syscall_64+0x19b/0x4b0 [ 21.600822] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 21.605996] RIP: 0033:0x446779 [ 21.609194] RSP: 002b:00007f445464ad18 EFLAGS: 00000297 ORIG_RAX: 0000000000000028 [ 21.616887] RAX: ffffffffffffffda RBX: 00000000006dbc78 RCX: 0000000000446779 [ 21.624140] RDX: 0000000020d83ff8 RSI: 0000000000000006 RDI: 0000000000000004 [ 21.631410] RBP: 00000000006dbc70 R08: 0000000000000000 R09: 0000000000000000 [ 21.638669] R10: 00008000fffffffe R11: 0000000000000297 R12: 00000000006dbc7c [ 21.645923] R13: 00007f445464ad20 R14: 20c49ba5e353f7cf R15: 00000000006dbd6c [ 21.653584] Dumping ftrace buffer: [ 21.657182] (ftrace buffer empty) [ 21.660890] Kernel Offset: 0x25e00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 21.671797] Rebooting in 86400 seconds..