[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 16.744705] random: sshd: uninitialized urandom read (32 bytes read) [ 17.098632] audit: type=1400 audit(1543822440.456:6): avc: denied { map } for pid=1757 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 [ 17.140730] random: sshd: uninitialized urandom read (32 bytes read) [ 17.564320] random: sshd: uninitialized urandom read (32 bytes read) [ 38.224639] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.16' (ECDSA) to the list of known hosts. [ 43.907445] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program [ 44.001281] audit: type=1400 audit(1543822467.366:7): avc: denied { map } for pid=1787 comm="syz-executor738" path="/root/syz-executor738331013" dev="sda1" ino=16461 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 44.056713] ------------[ cut here ]------------ [ 44.061542] WARNING: CPU: 0 PID: 1801 at fs/direct-io.c:293 dio_complete+0x578/0x800 [ 44.069402] Kernel panic - not syncing: panic_on_warn set ... [ 44.069402] [ 44.076740] CPU: 0 PID: 1801 Comm: syz-executor738 Not tainted 4.14.85+ #15 [ 44.083922] Call Trace: [ 44.086503] dump_stack+0xb9/0x11b [ 44.090046] ? dio_complete+0x4a0/0x800 [ 44.094024] panic+0x1bf/0x3a4 [ 44.097202] ? add_taint.cold.4+0x16/0x16 [ 44.101347] ? __probe_kernel_read+0x163/0x1c0 [ 44.105919] ? dio_complete+0x578/0x800 [ 44.109872] __warn.cold.7+0x2f/0x35 [ 44.113693] ? dio_complete+0x578/0x800 [ 44.117652] report_bug+0x1f7/0x26c [ 44.121265] do_error_trap+0x1ba/0x2c0 [ 44.125134] ? math_error+0x2d0/0x2d0 [ 44.128922] ? clear_shadow_entry+0x190/0x190 [ 44.133504] ? debug_object_activate+0x4e0/0x4e0 [ 44.138258] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 44.143096] invalid_op+0x18/0x40 [ 44.146645] RIP: 0010:dio_complete+0x578/0x800 [ 44.151221] RSP: 0018:ffff8881cc697070 EFLAGS: 00010297 [ 44.156571] RAX: ffff8881cb432f00 RBX: ffff8881ccfac000 RCX: 0000000000000000 [ 44.163824] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881cb432f24 [ 44.171074] RBP: 0000000000008200 R08: 0000000000000001 R09: 0000000000000000 [ 44.178406] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881c000ac60 [ 44.185662] R13: 0000000000008200 R14: 0000000000000002 R15: ffff8881ccfac098 [ 44.192925] ? ext4_update_bh_state+0xe0/0xe0 [ 44.197401] __blockdev_direct_IO+0x7614/0xc4e0 [ 44.202062] ? sb_init_dio_done_wq+0x70/0x70 [ 44.206451] ? release_pages+0x6e3/0xa90 [ 44.210497] ? _raw_spin_unlock_irqrestore+0x54/0x70 [ 44.215591] ? ext4_dio_get_block_unwritten_async+0x1b0/0x1b0 [ 44.221477] ? ext4_dio_get_block_unwritten_async+0x1b0/0x1b0 [ 44.227343] ext4_direct_IO+0x905/0x27f0 [ 44.231400] ? __filemap_fdatawait_range+0x1c2/0x260 [ 44.236609] ? ext4_da_write_begin+0x1050/0x1050 [ 44.241358] ? inode_dio_wait+0x220/0x220 [ 44.245484] ? generic_update_time+0x1a5/0x270 [ 44.250049] ? preempt_count_add+0xb8/0x180 [ 44.254369] ? filemap_check_errors+0x8b/0xb0 [ 44.258859] generic_file_direct_write+0x225/0x430 [ 44.263772] __generic_file_write_iter+0x213/0x540 [ 44.268683] ? generic_write_checks+0x252/0x410 [ 44.273332] ext4_file_write_iter+0x4f6/0xe20 [ 44.277942] ? ext4_file_mmap+0x1a0/0x1a0 [ 44.282085] ? kasan_kmalloc.part.1+0xa9/0xd0 [ 44.286688] ? kasan_kmalloc.part.1+0x4f/0xd0 [ 44.291197] ? __kmalloc+0x153/0x340 [ 44.294899] ? iter_file_splice_write+0x142/0xab0 [ 44.299751] ? direct_splice_actor+0x116/0x160 [ 44.304326] ? splice_direct_to_actor+0x28c/0x750 [ 44.309147] ? do_splice_direct+0x17b/0x220 [ 44.313468] do_iter_readv_writev+0x3a4/0x560 [ 44.317941] ? clone_verify_area+0x1e0/0x1e0 [ 44.322329] ? security_file_permission+0x88/0x1e0 [ 44.327237] do_iter_write+0x156/0x530 [ 44.331118] ? kasan_unpoison_shadow+0x30/0x40 [ 44.335723] ? kasan_kmalloc+0x76/0xc0 [ 44.339595] vfs_iter_write+0x70/0xa0 [ 44.343379] iter_file_splice_write+0x5b4/0xab0 [ 44.348037] ? vmsplice_to_user+0x1e0/0x1e0 [ 44.352340] ? avc_policy_seqno+0x5/0x10 [ 44.356385] ? vmsplice_to_user+0x1e0/0x1e0 [ 44.360685] direct_splice_actor+0x116/0x160 [ 44.365073] splice_direct_to_actor+0x28c/0x750 [ 44.369726] ? pipe_to_sendpage+0x300/0x300 [ 44.374132] ? do_splice_to+0x150/0x150 [ 44.378095] ? security_file_permission+0x88/0x1e0 [ 44.383022] do_splice_direct+0x17b/0x220 [ 44.387255] ? splice_direct_to_actor+0x750/0x750 [ 44.392084] ? rcu_read_lock_sched_held+0x102/0x120 [ 44.397092] do_sendfile+0x4a1/0xb50 [ 44.400799] ? do_compat_pwritev64+0x170/0x170 [ 44.405378] ? SyS_futex+0x1b7/0x2b5 [ 44.409075] SyS_sendfile64+0x11f/0x140 [ 44.413047] ? SyS_sendfile+0x150/0x150 [ 44.417043] ? do_syscall_64+0x43/0x4b0 [ 44.421011] ? SyS_sendfile+0x150/0x150 [ 44.424981] do_syscall_64+0x19b/0x4b0 [ 44.428850] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 44.434019] RIP: 0033:0x446659 [ 44.437190] RSP: 002b:00007f88dec9cd18 EFLAGS: 00000287 ORIG_RAX: 0000000000000028 [ 44.444980] RAX: ffffffffffffffda RBX: 00000000006dbc48 RCX: 0000000000446659 [ 44.452235] RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000004 [ 44.459495] RBP: 00000000006dbc40 R08: 0000000000000000 R09: 65732f636f72702f [ 44.466742] R10: 00008000fffffffe R11: 0000000000000287 R12: 00000000006dbc4c [ 44.473989] R13: 00007f88dec9cd20 R14: 0000000020001380 R15: 00000000006dbd4c [ 44.481633] Kernel Offset: 0x4a00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 44.492464] Rebooting in 86400 seconds..