[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   31.882453] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.
[   32.098359] random: sshd: uninitialized urandom read (32 bytes read)
[   32.622588] random: sshd: uninitialized urandom read (32 bytes read)

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   33.826664] random: sshd: uninitialized urandom read (32 bytes read)
[   46.652117] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.38' (ECDSA) to the list of known hosts.
[   52.195783] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   52.306129] ==================================================================
[   52.313801] BUG: KMSAN: kernel-infoleak in vcs_read+0x18ba/0x1cc0
[   52.320027] CPU: 0 PID: 4540 Comm: syz-executor524 Not tainted 4.17.0+ #5
[   52.326928] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   52.336273] Call Trace:
[   52.338857]  dump_stack+0x185/0x1d0
[   52.342462]  kmsan_report+0x188/0x2a0
[   52.346241]  kmsan_internal_check_memory+0x138/0x1f0
[   52.351338]  kmsan_copy_to_user+0x7a/0x160
[   52.355552]  vcs_read+0x18ba/0x1cc0
[   52.359165]  ? vcs_lseek+0x470/0x470
[   52.362858]  __vfs_read+0x1b2/0x9d0
[   52.366483]  vfs_read+0x36c/0x6b0
[   52.369919]  __x64_sys_read+0x1bf/0x3e0
[   52.373874]  ? ksys_read+0x360/0x360
[   52.377568]  do_syscall_64+0x15b/0x230
[   52.381450]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   52.386633] RIP: 0033:0x443d39
[   52.389813] RSP: 002b:00007ffe1f341578 EFLAGS: 00000213 ORIG_RAX: 0000000000000000
[   52.397500] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443d39
[   52.404749] RDX: 00000000000000f0 RSI: 0000000020000400 RDI: 0000000000000003
[   52.412000] RBP: 00000000006ce018 R08: 00000000004002e0 R09: 00000000004002e0
[   52.419250] R10: 000000000000000f R11: 0000000000000213 R12: 00000000004019e0
[   52.426510] R13: 0000000000401a70 R14: 0000000000000000 R15: 0000000000000000
[   52.433779] 
[   52.435384] Uninit was stored to memory at:
[   52.439689]  kmsan_internal_chain_origin+0x12b/0x210
[   52.444786]  __msan_chain_origin+0x69/0xc0
[   52.449000]  vcs_read+0xd01/0x1cc0
[   52.452520]  __vfs_read+0x1b2/0x9d0
[   52.456138]  vfs_read+0x36c/0x6b0
[   52.459569]  __x64_sys_read+0x1bf/0x3e0
[   52.463668]  do_syscall_64+0x15b/0x230
[   52.467552]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   52.472719] Uninit was created at:
[   52.476250]  kmsan_internal_poison_shadow+0xb8/0x1b0
[   52.481331]  kmsan_kmalloc+0x94/0x100
[   52.485123]  __kmalloc+0x13a/0x350
[   52.488648]  vc_allocate+0x438/0x800
[   52.492345]  con_install+0x8c/0x640
[   52.495959]  tty_init_dev+0x1b5/0x1020
[   52.499832]  tty_open+0x17b4/0x2ed0
[   52.503434]  chrdev_open+0xc25/0xd90
[   52.507128]  do_dentry_open+0xccc/0x1440
[   52.511184]  vfs_open+0x1b6/0x2f0
[   52.514621]  path_openat+0x4771/0x6640
[   52.518483]  do_filp_open+0x261/0x640
[   52.522268]  do_sys_open+0x624/0x960
[   52.525972]  __x64_sys_open+0xf2/0x130
[   52.529845]  do_syscall_64+0x15b/0x230
[   52.533727]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   52.538893] 
[   52.540513] Bytes 0-79 of 240 are uninitialized
[   52.545158] Memory access starts at ffff8801925b8000
[   52.550251] ==================================================================
[   52.557593] Disabling lock debugging due to kernel taint
[   52.563016] Kernel panic - not syncing: panic_on_warn set ...
[   52.563016] 
[   52.570356] CPU: 0 PID: 4540 Comm: syz-executor524 Tainted: G    B             4.17.0+ #5
[   52.578650] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   52.587983] Call Trace:
[   52.590567]  dump_stack+0x185/0x1d0
[   52.594200]  panic+0x3d0/0x990
[   52.597478]  kmsan_report+0x29e/0x2a0
[   52.601287]  kmsan_internal_check_memory+0x138/0x1f0
[   52.606375]  kmsan_copy_to_user+0x7a/0x160
[   52.610605]  vcs_read+0x18ba/0x1cc0
[   52.614248]  ? vcs_lseek+0x470/0x470
[   52.617951]  __vfs_read+0x1b2/0x9d0
[   52.621557]  vfs_read+0x36c/0x6b0
[   52.625009]  __x64_sys_read+0x1bf/0x3e0
[   52.628982]  ? ksys_read+0x360/0x360
[   52.632671]  do_syscall_64+0x15b/0x230
[   52.636543]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   52.641709] RIP: 0033:0x443d39
[   52.644872] RSP: 002b:00007ffe1f341578 EFLAGS: 00000213 ORIG_RAX: 0000000000000000
[   52.652561] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443d39
[   52.659810] RDX: 00000000000000f0 RSI: 0000000020000400 RDI: 0000000000000003
[   52.667064] RBP: 00000000006ce018 R08: 00000000004002e0 R09: 00000000004002e0
[   52.674400] R10: 000000000000000f R11: 0000000000000213 R12: 00000000004019e0
[   52.681652] R13: 0000000000401a70 R14: 0000000000000000 R15: 0000000000000000
[   52.689434] Dumping ftrace buffer:
[   52.692975]    (ftrace buffer empty)
[   52.696666] Kernel Offset: disabled
[   52.700289] Rebooting in 86400 seconds..