[ 11.223133] random: sshd: uninitialized urandom read (32 bytes read) [....] 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: [ 20.585397] random: sshd: uninitialized urandom read (32 bytes read) [ 20.929772] audit: type=1400 audit(1543106631.349:6): avc: denied { map } for pid=1759 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 [ 20.976362] random: sshd: uninitialized urandom read (32 bytes read) [ 21.421538] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.108' (ECDSA) to the list of known hosts. [ 27.386151] urandom_read: 1 callbacks suppressed [ 27.386154] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.480400] audit: type=1400 audit(1543106637.909:7): avc: denied { map } for pid=1777 comm="syz-executor934" path="/root/syz-executor934962647" dev="sda1" ino=16482 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 27.511207] audit: type=1400 audit(1543106637.939:8): avc: denied { map } for pid=1778 comm="syz-executor934" path="/root/bus" dev="sda1" ino=16461 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:file_t:s0 tclass=file permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 42.595610] random: crng init done executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 57.956094] ------------[ cut here ]------------ [ 57.960958] WARNING: CPU: 0 PID: 3112 at fs/direct-io.c:293 dio_complete+0x578/0x800 [ 57.968816] Kernel panic - not syncing: panic_on_warn set ... [ 57.968816] [ 57.976158] CPU: 0 PID: 3112 Comm: syz-executor934 Not tainted 4.14.83+ #9 [ 57.983235] Call Trace: [ 57.985815] dump_stack+0xb9/0x11b [ 57.989341] ? dio_complete+0x4c0/0x800 [ 57.993293] panic+0x1bf/0x3a4 [ 57.996466] ? add_taint.cold.4+0x16/0x16 [ 58.000750] ? __probe_kernel_read+0x163/0x1c0 [ 58.005334] ? dio_complete+0x578/0x800 [ 58.009293] __warn.cold.7+0x2f/0x35 [ 58.013070] ? dio_complete+0x578/0x800 [ 58.017035] report_bug+0x1f7/0x26c [ 58.020652] do_error_trap+0x1ba/0x2c0 [ 58.024532] ? math_error+0x2d0/0x2d0 [ 58.028316] ? clear_shadow_entry+0x190/0x190 [ 58.032802] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 58.037637] invalid_op+0x18/0x40 [ 58.041093] RIP: 0010:dio_complete+0x578/0x800 [ 58.045667] RSP: 0018:ffff8801c7e07070 EFLAGS: 00010297 [ 58.051124] RAX: ffff8801c8274680 RBX: ffff8801c7dc5a00 RCX: 0000000000000000 [ 58.058376] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8801c82746a4 [ 58.065627] RBP: 0000000000010000 R08: 1ffff1003a48b400 R09: 0000000000000000 [ 58.072876] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801cebf54d8 [ 58.080141] R13: 0000000000010000 R14: 0000000000000002 R15: ffff8801c7dc5a98 [ 58.087413] ? ext4_update_bh_state+0xe0/0xe0 [ 58.091896] __blockdev_direct_IO+0x7614/0xc4e0 [ 58.096560] ? sb_init_dio_done_wq+0x70/0x70 [ 58.100958] ? trace_hardirqs_on+0x10/0x10 [ 58.105182] ? ext4_dio_get_block_unwritten_async+0x1b0/0x1b0 [ 58.111068] ? ext4_dio_get_block_unwritten_async+0x1b0/0x1b0 [ 58.116927] ext4_direct_IO+0x905/0x27f0 [ 58.121072] ? __filemap_fdatawait_range+0x1c2/0x260 [ 58.126152] ? ext4_da_write_begin+0x1050/0x1050 [ 58.130898] ? filemap_check_errors+0x8b/0xb0 [ 58.135370] generic_file_direct_write+0x225/0x430 [ 58.140410] __generic_file_write_iter+0x213/0x540 [ 58.145317] ? generic_write_checks+0x252/0x410 [ 58.150072] ext4_file_write_iter+0x4f6/0xe20 [ 58.154556] ? ext4_file_mmap+0x1a0/0x1a0 [ 58.158689] ? kasan_kmalloc.part.1+0xa9/0xd0 [ 58.163167] ? kasan_kmalloc.part.1+0x4f/0xd0 [ 58.167642] ? __kmalloc+0x153/0x340 [ 58.171332] ? iter_file_splice_write+0x142/0xab0 [ 58.176150] ? direct_splice_actor+0x116/0x160 [ 58.180708] ? splice_direct_to_actor+0x28c/0x750 [ 58.185536] ? do_splice_direct+0x17b/0x220 [ 58.189846] do_iter_readv_writev+0x3a4/0x560 [ 58.194320] ? clone_verify_area+0x1e0/0x1e0 [ 58.198813] ? security_file_permission+0x88/0x1e0 [ 58.203723] do_iter_write+0x156/0x530 [ 58.207590] ? kasan_unpoison_shadow+0x30/0x40 [ 58.212154] ? kasan_kmalloc+0x76/0xc0 [ 58.216021] vfs_iter_write+0x70/0xa0 [ 58.219802] iter_file_splice_write+0x5b4/0xab0 [ 58.224453] ? vmsplice_to_user+0x1e0/0x1e0 [ 58.228762] ? avc_policy_seqno+0x5/0x10 [ 58.232813] ? vmsplice_to_user+0x1e0/0x1e0 [ 58.237168] direct_splice_actor+0x116/0x160 [ 58.241606] splice_direct_to_actor+0x28c/0x750 [ 58.246260] ? pipe_to_sendpage+0x300/0x300 [ 58.250561] ? do_splice_to+0x150/0x150 [ 58.254515] ? security_file_permission+0x88/0x1e0 [ 58.259427] do_splice_direct+0x17b/0x220 [ 58.263546] ? splice_direct_to_actor+0x750/0x750 [ 58.268368] ? rcu_read_lock_sched_held+0x102/0x120 [ 58.273367] do_sendfile+0x4a1/0xb50 [ 58.277192] ? do_compat_pwritev64+0x170/0x170 [ 58.281754] ? kmem_cache_free+0x2cd/0x350 [ 58.285975] ? SyS_futex+0x1b7/0x2b5 [ 58.289670] SyS_sendfile64+0x11f/0x140 [ 58.293621] ? SyS_sendfile+0x150/0x150 [ 58.297573] ? do_syscall_64+0x43/0x4b0 [ 58.301523] ? SyS_sendfile+0x150/0x150 [ 58.305470] do_syscall_64+0x19b/0x4b0 [ 58.309346] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 58.314515] RIP: 0033:0x446499 [ 58.317678] RSP: 002b:00007f9da81c6d18 EFLAGS: 00000297 ORIG_RAX: 0000000000000028 [ 58.325366] RAX: ffffffffffffffda RBX: 00000000006dbc48 RCX: 0000000000446499 [ 58.332624] RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000004 [ 58.339872] RBP: 00000000006dbc40 R08: 65732f636f72702f R09: 65732f636f72702f [ 58.347124] R10: 00008000fffffffe R11: 0000000000000297 R12: 00000000006dbc4c [ 58.354374] R13: 00007f9da81c6d20 R14: 00000000200000c0 R15: 00000000006dbd4c [ 58.362186] Kernel Offset: 0x16a00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 58.373144] Rebooting in 86400 seconds..