[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   54.176579] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   56.472526] random: sshd: uninitialized urandom read (32 bytes read)
[   56.977318] random: sshd: uninitialized urandom read (32 bytes read)
[   59.084874] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.91' (ECDSA) to the list of known hosts.
[   64.870862] random: sshd: uninitialized urandom read (32 bytes read)
2018/09/20 18:20:43 fuzzer started
[   66.613709] random: cc1: uninitialized urandom read (8 bytes read)
2018/09/20 18:20:46 connecting to host at 10.128.0.26:35823
2018/09/20 18:20:46 checking revisions...
[   68.571969] ==================================================================
[   68.579404] BUG: KMSAN: uninit-value in kcov_open+0x4a/0xa0
[   68.585131] CPU: 1 PID: 4760 Comm: syz-fuzzer Not tainted 4.19.0-rc4+ #54
[   68.592044] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   68.601457] Call Trace:
[   68.604047]  dump_stack+0x2f6/0x430
[   68.607701]  kmsan_report+0x183/0x2b0
[   68.611507]  kmsan_internal_check_memory+0x17e/0x1f0
[   68.616617]  kmsan_check_memory+0xb/0x10
[   68.620698]  kcov_open+0x4a/0xa0
[   68.624067]  ? kcov_mmap+0x120/0x120
[   68.627779]  open_proxy_open+0x545/0x5d0
[   68.631919]  ? debugfs_file_put+0x100/0x100
[   68.636242]  do_dentry_open+0xfb0/0x18b0
[   68.640299]  ? kmsan_memcpy_origins+0x111/0x1b0
[   68.644978]  vfs_open+0xaf/0xe0
[   68.648255]  path_openat+0x1845/0x6e50
[   68.652157]  ? kmsan_set_origin_inline+0x6b/0x120
[   68.657033]  do_filp_open+0x259/0x610
[   68.660867]  do_sys_open+0x630/0x940
[   68.664599]  __se_sys_openat+0xcb/0xe0
[   68.668525]  __x64_sys_openat+0x56/0x70
[   68.672497]  do_syscall_64+0xb8/0x100
[   68.676314]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   68.681496] RIP: 0033:0x47fcba
[   68.684693] Code: e8 2b 41 fb ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 4c 8b 54 24 28 4c 8b 44 24 30 4c 8b 4c 24 38 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 40 ff ff ff ff 48 c7 44 24 48
[   68.703595] RSP: 002b:000000c420125650 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
[   68.711302] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcba
[   68.718563] RDX: 0000000000080000 RSI: 000000c420012120 RDI: ffffffffffffff9c
[   68.725830] RBP: 000000c4201256d0 R08: 0000000000000000 R09: 0000000000000000
[   68.733092] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
[   68.740352] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000108
[   68.747624] 
[   68.749253] Local variable description: ----c.i.i.i.i@generic_permission
[   68.756074] Variable was created at:
[   68.759784]  generic_permission+0x4f/0xa90
[   68.764017]  inode_permission+0x11b/0x940
[   68.768145] 
[   68.769760] Byte 7 of 8 is uninitialized
[   68.773807] Memory access starts at ffff8801aaa8f810
[   68.778911] ==================================================================
[   68.786252] Disabling lock debugging due to kernel taint
[   68.791697] Kernel panic - not syncing: panic_on_warn set ...
[   68.791697] 
[   68.799059] CPU: 1 PID: 4760 Comm: syz-fuzzer Tainted: G    B             4.19.0-rc4+ #54
[   68.807361] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   68.816724] Call Trace:
[   68.819309]  dump_stack+0x2f6/0x430
[   68.822938]  panic+0x54c/0xaf7
[   68.826154]  ? __msan_metadata_ptr_for_store_1+0x13/0x20
[   68.831607]  kmsan_report+0x2a8/0x2b0
[   68.835419]  kmsan_internal_check_memory+0x17e/0x1f0
[   68.840526]  kmsan_check_memory+0xb/0x10
[   68.844637]  kcov_open+0x4a/0xa0
[   68.848041]  ? kcov_mmap+0x120/0x120
[   68.851781]  open_proxy_open+0x545/0x5d0
[   68.855852]  ? debugfs_file_put+0x100/0x100
[   68.860173]  do_dentry_open+0xfb0/0x18b0
[   68.864231]  ? kmsan_memcpy_origins+0x111/0x1b0
[   68.868910]  vfs_open+0xaf/0xe0
[   68.872208]  path_openat+0x1845/0x6e50
[   68.876111]  ? kmsan_set_origin_inline+0x6b/0x120
[   68.880986]  do_filp_open+0x259/0x610
[   68.884852]  do_sys_open+0x630/0x940
[   68.888579]  __se_sys_openat+0xcb/0xe0
[   68.892470]  __x64_sys_openat+0x56/0x70
[   68.896439]  do_syscall_64+0xb8/0x100
[   68.900236]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   68.905415] RIP: 0033:0x47fcba
[   68.908605] Code: e8 2b 41 fb ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 4c 8b 54 24 28 4c 8b 44 24 30 4c 8b 4c 24 38 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 40 ff ff ff ff 48 c7 44 24 48
[   68.927534] RSP: 002b:000000c420125650 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
[   68.935293] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcba
[   68.942555] RDX: 0000000000080000 RSI: 000000c420012120 RDI: ffffffffffffff9c
[   68.949841] RBP: 000000c4201256d0 R08: 0000000000000000 R09: 0000000000000000
[   68.957101] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
[   68.964360] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000108
[   68.972034] Kernel Offset: disabled
[   68.975676] Rebooting in 86400 seconds..