[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.872564] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.485562] random: sshd: uninitialized urandom read (32 bytes read) [ 19.899093] random: sshd: uninitialized urandom read (32 bytes read) [ 20.402421] random: sshd: uninitialized urandom read (32 bytes read) [ 38.520378] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.7' (ECDSA) to the list of known hosts. [ 44.065959] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program [ 44.197084] ------------[ cut here ]------------ [ 44.201887] WARNING: CPU: 0 PID: 2008 at fs/direct-io.c:293 dio_complete+0x578/0x800 [ 44.209751] Kernel panic - not syncing: panic_on_warn set ... [ 44.209751] [ 44.217096] CPU: 0 PID: 2008 Comm: syz-executor876 Not tainted 4.14.67+ #1 [ 44.224173] Call Trace: [ 44.226748] dump_stack+0xb9/0x11b [ 44.230314] ? dio_complete+0x4c0/0x800 [ 44.234271] panic+0x1bf/0x3a4 [ 44.237452] ? add_taint.cold.4+0x16/0x16 [ 44.241588] ? __probe_kernel_read+0x163/0x1c0 [ 44.246167] ? dio_complete+0x578/0x800 [ 44.250128] __warn.cold.7+0x148/0x185 [ 44.254015] ? dio_complete+0x578/0x800 [ 44.258014] report_bug+0x1f7/0x26c [ 44.261630] do_error_trap+0x1ba/0x2c0 [ 44.265503] ? math_error+0x2d0/0x2d0 [ 44.269286] ? clear_shadow_entry+0x190/0x190 [ 44.273772] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 44.278601] invalid_op+0x18/0x40 [ 44.282036] RIP: 0010:dio_complete+0x578/0x800 [ 44.286593] RSP: 0018:ffff8801d26a7070 EFLAGS: 00010297 [ 44.291935] RAX: ffff8801d5805e00 RBX: ffff8801c2408000 RCX: 0000000000000000 [ 44.299180] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8801d5805e24 [ 44.306468] RBP: 0000000000010000 R08: 1ffff10038809000 R09: 0000000000000000 [ 44.313736] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801befe8c00 [ 44.320989] R13: 0000000000010000 R14: 0000000000000002 R15: ffff8801c2408098 [ 44.328263] ? ext4_update_bh_state+0xe0/0xe0 [ 44.332801] __blockdev_direct_IO+0x7614/0xc4e0 [ 44.337600] ? sb_init_dio_done_wq+0x70/0x70 [ 44.341997] ? release_pages+0x6e3/0xa90 [ 44.346049] ? _raw_spin_unlock_irqrestore+0x54/0x70 [ 44.351233] ? ext4_dio_get_block_unwritten_async+0x1b0/0x1b0 [ 44.357242] ? ext4_dio_get_block_unwritten_async+0x1b0/0x1b0 [ 44.363178] ext4_direct_IO+0x905/0x27f0 [ 44.367258] ? __filemap_fdatawait_range+0x1c2/0x260 [ 44.372348] ? ext4_da_write_begin+0x1050/0x1050 [ 44.377085] ? wait_on_page_bit+0x2e0/0x2e0 [ 44.381576] ? current_time+0x16/0xb0 [ 44.385371] ? replace_page_cache_page+0x5f0/0x5f0 [ 44.390286] ? current_time+0x89/0xb0 [ 44.394068] ? filemap_check_errors+0x8b/0xb0 [ 44.398543] generic_file_direct_write+0x225/0x430 [ 44.403460] __generic_file_write_iter+0x213/0x540 [ 44.408372] ? generic_write_checks+0x252/0x410 [ 44.413047] ext4_file_write_iter+0x4f6/0xe20 [ 44.417532] ? ext4_file_mmap+0x1a0/0x1a0 [ 44.421752] ? kasan_kmalloc.part.1+0xa9/0xd0 [ 44.426247] ? kasan_kmalloc.part.1+0x4f/0xd0 [ 44.430725] ? __kmalloc+0x153/0x340 [ 44.434423] ? iter_file_splice_write+0x142/0xab0 [ 44.439293] ? direct_splice_actor+0x116/0x160 [ 44.443918] ? splice_direct_to_actor+0x28c/0x750 [ 44.448745] ? do_splice_direct+0x17b/0x220 [ 44.453060] do_iter_readv_writev+0x3a4/0x560 [ 44.457535] ? clone_verify_area+0x1e0/0x1e0 [ 44.461944] ? security_file_permission+0x88/0x1e0 [ 44.466898] do_iter_write+0x156/0x530 [ 44.470780] ? kasan_unpoison_shadow+0x30/0x40 [ 44.475346] ? kasan_kmalloc+0x76/0xc0 [ 44.479228] vfs_iter_write+0x70/0xa0 [ 44.483023] iter_file_splice_write+0x5b4/0xab0 [ 44.487723] ? vmsplice_to_user+0x1e0/0x1e0 [ 44.492044] ? avc_policy_seqno+0x5/0x10 [ 44.496102] ? vmsplice_to_user+0x1e0/0x1e0 [ 44.500406] direct_splice_actor+0x116/0x160 [ 44.504800] splice_direct_to_actor+0x28c/0x750 [ 44.509452] ? pipe_to_sendpage+0x300/0x300 [ 44.513753] ? do_splice_to+0x150/0x150 [ 44.517713] ? security_file_permission+0x88/0x1e0 [ 44.522632] do_splice_direct+0x17b/0x220 [ 44.526764] ? splice_direct_to_actor+0x750/0x750 [ 44.531590] ? rcu_read_lock_sched_held+0x102/0x120 [ 44.536647] do_sendfile+0x4a1/0xb50 [ 44.540350] ? do_compat_pwritev64+0x170/0x170 [ 44.544912] ? __might_fault+0xd4/0x1b0 [ 44.548868] ? __might_fault+0x177/0x1b0 [ 44.552919] SyS_sendfile64+0xab/0x140 [ 44.556786] ? SyS_sendfile+0x150/0x150 [ 44.560741] ? do_syscall_64+0x43/0x4b0 [ 44.564695] ? SyS_sendfile+0x150/0x150 [ 44.568702] do_syscall_64+0x19b/0x4b0 [ 44.572580] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 44.577754] RIP: 0033:0x4465c9 [ 44.580920] RSP: 002b:00007f85fabf0d18 EFLAGS: 00000297 ORIG_RAX: 0000000000000028 [ 44.588609] RAX: ffffffffffffffda RBX: 00000000006dbc48 RCX: 00000000004465c9 [ 44.595855] RDX: 0000000020d83ff8 RSI: 0000000000000006 RDI: 0000000000000004 [ 44.603101] RBP: 00000000006dbc40 R08: 0000000000000000 R09: 65732f636f72702f [ 44.610348] R10: 00008000fffffffe R11: 0000000000000297 R12: 00000000006dbc4c [ 44.617657] R13: 00007f85fabf0d20 R14: 0000000000000000 R15: 00000000006dbd4c [ 44.625225] Dumping ftrace buffer: [ 44.628821] (ftrace buffer empty) [ 44.632520] Kernel Offset: 0x28e00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 44.643421] Rebooting in 86400 seconds..