[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.949008] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.356820] random: sshd: uninitialized urandom read (32 bytes read) [ 22.713627] random: sshd: uninitialized urandom read (32 bytes read) [ 23.130313] random: sshd: uninitialized urandom read (32 bytes read) [ 35.655669] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.13' (ECDSA) to the list of known hosts. [ 41.214538] 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 [ 41.719241] ------------[ cut here ]------------ [ 41.724047] WARNING: CPU: 1 PID: 2022 at fs/direct-io.c:293 dio_complete+0x578/0x800 [ 41.731905] Kernel panic - not syncing: panic_on_warn set ... [ 41.731905] [ 41.739241] CPU: 1 PID: 2022 Comm: syz-executor209 Not tainted 4.14.67+ #1 [ 41.746223] Call Trace: [ 41.748786] dump_stack+0xb9/0x11b [ 41.752298] ? dio_complete+0x4c0/0x800 [ 41.756246] panic+0x1bf/0x3a4 [ 41.759413] ? add_taint.cold.4+0x16/0x16 [ 41.763538] ? __probe_kernel_read+0x163/0x1c0 [ 41.768099] ? dio_complete+0x578/0x800 [ 41.772050] __warn.cold.7+0x148/0x185 [ 41.775923] ? dio_complete+0x578/0x800 [ 41.779871] report_bug+0x1f7/0x26c [ 41.783475] do_error_trap+0x1ba/0x2c0 [ 41.787337] ? math_error+0x2d0/0x2d0 [ 41.791110] ? clear_shadow_entry+0x190/0x190 [ 41.795585] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 41.800402] invalid_op+0x18/0x40 [ 41.803829] RIP: 0010:dio_complete+0x578/0x800 [ 41.808381] RSP: 0018:ffff8801bf7af070 EFLAGS: 00010297 [ 41.813716] RAX: ffff8801bf25af00 RBX: ffff8801c92d7a80 RCX: 0000000000000000 [ 41.820961] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8801bf25af24 [ 41.828205] RBP: 0000000000010000 R08: 1ffff1003a26b000 R09: 0000000000000000 [ 41.835448] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801c3c854d8 [ 41.842691] R13: 0000000000010000 R14: 0000000000000002 R15: ffff8801c92d7b18 [ 41.849950] ? ext4_update_bh_state+0xe0/0xe0 [ 41.854429] __blockdev_direct_IO+0x7614/0xc4e0 [ 41.859088] ? sb_init_dio_done_wq+0x70/0x70 [ 41.863476] ? trace_hardirqs_on+0x10/0x10 [ 41.867695] ? ext4_dio_get_block_unwritten_async+0x1b0/0x1b0 [ 41.873561] ? ext4_dio_get_block_unwritten_async+0x1b0/0x1b0 [ 41.879418] ext4_direct_IO+0x905/0x27f0 [ 41.883458] ? __filemap_fdatawait_range+0x1c2/0x260 [ 41.888605] ? ext4_da_write_begin+0x1050/0x1050 [ 41.893366] ? current_time+0x89/0xb0 [ 41.897146] ? filemap_check_errors+0x8b/0xb0 [ 41.901622] generic_file_direct_write+0x225/0x430 [ 41.906535] __generic_file_write_iter+0x213/0x540 [ 41.911441] ? generic_write_checks+0x252/0x410 [ 41.916092] ext4_file_write_iter+0x4f6/0xe20 [ 41.920567] ? ext4_file_mmap+0x1a0/0x1a0 [ 41.924696] ? kasan_kmalloc.part.1+0xa9/0xd0 [ 41.929166] ? kasan_kmalloc.part.1+0x4f/0xd0 [ 41.933633] ? __kmalloc+0x153/0x340 [ 41.937319] ? iter_file_splice_write+0x142/0xab0 [ 41.942143] ? direct_splice_actor+0x116/0x160 [ 41.946790] ? splice_direct_to_actor+0x28c/0x750 [ 41.951617] ? do_splice_direct+0x17b/0x220 [ 41.955929] do_iter_readv_writev+0x3a4/0x560 [ 41.960409] ? clone_verify_area+0x1e0/0x1e0 [ 41.964797] ? security_file_permission+0x88/0x1e0 [ 41.969704] do_iter_write+0x156/0x530 [ 41.973568] ? kasan_unpoison_shadow+0x30/0x40 [ 41.978128] ? kasan_kmalloc+0x76/0xc0 [ 41.981993] vfs_iter_write+0x70/0xa0 [ 41.985772] iter_file_splice_write+0x5b4/0xab0 [ 41.990423] ? vmsplice_to_user+0x1e0/0x1e0 [ 41.994721] ? avc_policy_seqno+0x5/0x10 [ 41.998760] ? vmsplice_to_user+0x1e0/0x1e0 [ 42.003063] direct_splice_actor+0x116/0x160 [ 42.007448] splice_direct_to_actor+0x28c/0x750 [ 42.012092] ? pipe_to_sendpage+0x300/0x300 [ 42.016397] ? do_splice_to+0x150/0x150 [ 42.020344] ? security_file_permission+0x88/0x1e0 [ 42.025253] do_splice_direct+0x17b/0x220 [ 42.029376] ? splice_direct_to_actor+0x750/0x750 [ 42.034207] ? rcu_read_lock_sched_held+0x102/0x120 [ 42.039356] do_sendfile+0x4a1/0xb50 [ 42.043060] ? do_compat_pwritev64+0x170/0x170 [ 42.047623] ? __might_fault+0xd4/0x1b0 [ 42.051577] ? __might_fault+0x177/0x1b0 [ 42.055615] SyS_sendfile64+0xab/0x140 [ 42.059482] ? SyS_sendfile+0x150/0x150 [ 42.063435] ? do_syscall_64+0x43/0x4b0 [ 42.067455] ? SyS_sendfile+0x150/0x150 [ 42.071416] do_syscall_64+0x19b/0x4b0 [ 42.075289] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 42.080458] RIP: 0033:0x4464d9 [ 42.083625] RSP: 002b:00007fdfb821ed18 EFLAGS: 00000297 ORIG_RAX: 0000000000000028 [ 42.091379] RAX: ffffffffffffffda RBX: 00000000006dbc48 RCX: 00000000004464d9 [ 42.098639] RDX: 0000000020d83ff8 RSI: 000000000000000a RDI: 0000000000000008 [ 42.105888] RBP: 00000000006dbc40 R08: 65732f636f72702f R09: 65732f636f72702f [ 42.113139] R10: 00008000fffffffe R11: 0000000000000297 R12: 00000000006dbc4c [ 42.120386] R13: 00007fdfb821ed20 R14: 0000000000000000 R15: 00000000006dbd4c [ 42.128011] Dumping ftrace buffer: [ 42.131655] (ftrace buffer empty) [ 42.135351] Kernel Offset: 0x2ac00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 42.146250] Rebooting in 86400 seconds..