[....] Starting OpenBSD Secure Shell server: sshd[ 11.739474] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.493550] random: sshd: uninitialized urandom read (32 bytes read) [ 17.840905] audit: type=1400 audit(1537723624.309:6): avc: denied { map } for pid=1761 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 [ 17.884053] random: sshd: uninitialized urandom read (32 bytes read) [ 18.357343] random: sshd: uninitialized urandom read (32 bytes read) [ 25.180927] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.22' (ECDSA) to the list of known hosts. [ 30.840560] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program [ 30.929218] audit: type=1400 audit(1537723637.389:7): avc: denied { map } for pid=1779 comm="syz-executor165" path="/root/syz-executor165561455" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 30.958403] ------------[ cut here ]------------ [ 30.963257] WARNING: CPU: 0 PID: 1791 at fs/direct-io.c:293 dio_complete+0x578/0x800 [ 30.971124] Kernel panic - not syncing: panic_on_warn set ... [ 30.971124] [ 30.978474] CPU: 0 PID: 1791 Comm: syz-executor165 Not tainted 4.14.71+ #8 [ 30.985461] Call Trace: [ 30.988032] dump_stack+0xb9/0x11b [ 30.991560] ? dio_complete+0x510/0x800 [ 30.995513] panic+0x1bf/0x3a4 [ 30.998806] ? add_taint.cold.4+0x16/0x16 [ 31.002946] ? __probe_kernel_read+0x163/0x1c0 [ 31.007518] ? dio_complete+0x578/0x800 [ 31.011476] __warn.cold.7+0x148/0x185 [ 31.015374] ? dio_complete+0x578/0x800 [ 31.019332] report_bug+0x1f7/0x26c [ 31.022954] do_error_trap+0x1ba/0x2c0 [ 31.026824] ? math_error+0x2d0/0x2d0 [ 31.030607] ? clear_shadow_entry+0x190/0x190 [ 31.035113] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.039940] invalid_op+0x18/0x40 [ 31.043372] RIP: 0010:dio_complete+0x578/0x800 [ 31.047929] RSP: 0018:ffff8801d2dd7070 EFLAGS: 00010297 [ 31.053282] RAX: ffff8801d30b8000 RBX: ffff8801d1e09040 RCX: 0000000000000000 [ 31.060531] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8801d30b8024 [ 31.067780] RBP: 0000000000010000 R08: 1ffff1003a44d800 R09: 0000000000000000 [ 31.075163] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801c3863478 [ 31.082420] R13: 0000000000010000 R14: 0000000000000002 R15: ffff8801d1e090d8 [ 31.089711] ? ext4_update_bh_state+0xe0/0xe0 [ 31.094244] __blockdev_direct_IO+0x7614/0xc4e0 [ 31.098932] ? sb_init_dio_done_wq+0x70/0x70 [ 31.103336] ? trace_hardirqs_on+0x10/0x10 [ 31.107571] ? ext4_dio_get_block_unwritten_async+0x1b0/0x1b0 [ 31.113454] ? ext4_dio_get_block_unwritten_async+0x1b0/0x1b0 [ 31.119320] ext4_direct_IO+0x905/0x27f0 [ 31.123369] ? __filemap_fdatawait_range+0x1c2/0x260 [ 31.128539] ? ext4_da_write_begin+0x1050/0x1050 [ 31.133308] ? current_time+0x89/0xb0 [ 31.137101] ? filemap_check_errors+0x8b/0xb0 [ 31.141591] generic_file_direct_write+0x225/0x430 [ 31.146512] __generic_file_write_iter+0x213/0x540 [ 31.151426] ? generic_write_checks+0x252/0x410 [ 31.156102] ext4_file_write_iter+0x4f6/0xe20 [ 31.160601] ? ext4_file_mmap+0x1a0/0x1a0 [ 31.164735] ? kasan_kmalloc.part.1+0xa9/0xd0 [ 31.169208] ? kasan_kmalloc.part.1+0x4f/0xd0 [ 31.173678] ? __kmalloc+0x153/0x340 [ 31.177370] ? iter_file_splice_write+0x142/0xab0 [ 31.182197] ? direct_splice_actor+0x116/0x160 [ 31.186768] ? splice_direct_to_actor+0x28c/0x750 [ 31.191610] ? do_splice_direct+0x17b/0x220 [ 31.195930] do_iter_readv_writev+0x3a4/0x560 [ 31.200418] ? clone_verify_area+0x1e0/0x1e0 [ 31.204840] ? security_file_permission+0x88/0x1e0 [ 31.209769] do_iter_write+0x156/0x530 [ 31.213646] ? kasan_unpoison_shadow+0x30/0x40 [ 31.218219] ? kasan_kmalloc+0x76/0xc0 [ 31.222086] vfs_iter_write+0x70/0xa0 [ 31.225879] iter_file_splice_write+0x5b4/0xab0 [ 31.230614] ? vmsplice_to_user+0x1e0/0x1e0 [ 31.234934] ? avc_policy_seqno+0x5/0x10 [ 31.238989] ? vmsplice_to_user+0x1e0/0x1e0 [ 31.243288] direct_splice_actor+0x116/0x160 [ 31.247677] splice_direct_to_actor+0x28c/0x750 [ 31.252324] ? pipe_to_sendpage+0x300/0x300 [ 31.256628] ? do_splice_to+0x150/0x150 [ 31.260589] ? security_file_permission+0x88/0x1e0 [ 31.265511] do_splice_direct+0x17b/0x220 [ 31.269649] ? splice_direct_to_actor+0x750/0x750 [ 31.274482] ? rcu_read_lock_sched_held+0x102/0x120 [ 31.279479] do_sendfile+0x4a1/0xb50 [ 31.283237] ? do_compat_pwritev64+0x170/0x170 [ 31.287818] ? __might_fault+0xd4/0x1b0 [ 31.291774] ? __might_fault+0x177/0x1b0 [ 31.295823] SyS_sendfile64+0xab/0x140 [ 31.299841] ? SyS_sendfile+0x150/0x150 [ 31.303807] ? do_syscall_64+0x43/0x4b0 [ 31.307799] ? SyS_sendfile+0x150/0x150 [ 31.311756] do_syscall_64+0x19b/0x4b0 [ 31.315626] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 31.320792] RIP: 0033:0x4466e9 [ 31.323962] RSP: 002b:00007f9801242d18 EFLAGS: 00000297 ORIG_RAX: 0000000000000028 [ 31.331762] RAX: ffffffffffffffda RBX: 00000000006dbc48 RCX: 00000000004466e9 [ 31.339013] RDX: 0000000020d83ff8 RSI: 0000000000000006 RDI: 0000000000000004 [ 31.346268] RBP: 00000000006dbc40 R08: 65732f636f72702f R09: 65732f636f72702f [ 31.353529] R10: 00008000fffffffe R11: 0000000000000297 R12: 00000000006dbc4c [ 31.360783] R13: 00007f9801242d20 R14: 0000000000000000 R15: 00000000006dbd4c [ 31.368469] Kernel Offset: 0x34400000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 31.379381] Rebooting in 86400 seconds..