[....] 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[   45.349878] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.
[   46.911709] random: sshd: uninitialized urandom read (32 bytes read)

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   47.300880] random: sshd: uninitialized urandom read (32 bytes read)
[   48.651714] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.82' (ECDSA) to the list of known hosts.
[   54.392311] random: sshd: uninitialized urandom read (32 bytes read)
2018/09/21 06:32:38 fuzzer started
[   55.891304] random: cc1: uninitialized urandom read (8 bytes read)
2018/09/21 06:32:41 connecting to host at 10.128.0.26:33345
2018/09/21 06:32:41 checking revisions...
[   57.609048] ==================================================================
[   57.616635] BUG: KMSAN: uninit-value in kcov_open+0x4a/0xa0
[   57.622353] CPU: 0 PID: 4542 Comm: syz-fuzzer Not tainted 4.19.0-rc4+ #55
[   57.629258] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   57.638601] Call Trace:
[   57.641183]  dump_stack+0x2f6/0x430
[   57.644822]  kmsan_report+0x183/0x2b0
[   57.648632]  kmsan_internal_check_memory+0x17e/0x1f0
[   57.653735]  kmsan_check_memory+0xb/0x10
[   57.657779]  kcov_open+0x4a/0xa0
[   57.661132]  ? kcov_mmap+0x120/0x120
[   57.664847]  open_proxy_open+0x545/0x5d0
[   57.668911]  ? debugfs_file_put+0x100/0x100
[   57.673216]  do_dentry_open+0xfb0/0x18b0
[   57.677261]  ? kmsan_memcpy_origins+0x111/0x1b0
[   57.681923]  vfs_open+0xaf/0xe0
[   57.685189]  path_openat+0x1845/0x6e50
[   57.689069]  ? kmsan_set_origin_inline+0x6b/0x120
[   57.693910]  do_filp_open+0x259/0x610
[   57.697708]  do_sys_open+0x630/0x940
[   57.701413]  __se_sys_openat+0xcb/0xe0
[   57.705291]  __x64_sys_openat+0x56/0x70
[   57.709253]  do_syscall_64+0xb8/0x100
[   57.713044]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   57.718220] RIP: 0033:0x47fcba
[   57.721399] 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
[   57.740284] RSP: 002b:000000c420031650 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
[   57.747978] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcba
[   57.755234] RDX: 0000000000080000 RSI: 000000c420084480 RDI: ffffffffffffff9c
[   57.762486] RBP: 000000c4200316d0 R08: 0000000000000000 R09: 0000000000000000
[   57.769740] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
[   57.777018] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
[   57.784278] 
[   57.785886] Local variable description: ----c.i.i.i.i@generic_permission
[   57.792705] Variable was created at:
[   57.796406]  generic_permission+0x4f/0xa90
[   57.800637]  inode_permission+0x11b/0x940
[   57.804775] 
[   57.806382] Byte 7 of 8 is uninitialized
[   57.810423] Memory access starts at ffff8801aed3f810
[   57.815505] ==================================================================
[   57.822842] Disabling lock debugging due to kernel taint
[   57.828273] Kernel panic - not syncing: panic_on_warn set ...
[   57.828273] 
[   57.835632] CPU: 0 PID: 4542 Comm: syz-fuzzer Tainted: G    B             4.19.0-rc4+ #55
[   57.843958] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   57.853295] Call Trace:
[   57.855865]  dump_stack+0x2f6/0x430
[   57.859482]  panic+0x54c/0xaf7
[   57.862673]  ? __msan_metadata_ptr_for_store_1+0x13/0x20
[   57.868112]  kmsan_report+0x2a8/0x2b0
[   57.871920]  kmsan_internal_check_memory+0x17e/0x1f0
[   57.877013]  kmsan_check_memory+0xb/0x10
[   57.881061]  kcov_open+0x4a/0xa0
[   57.884415]  ? kcov_mmap+0x120/0x120
[   57.888131]  open_proxy_open+0x545/0x5d0
[   57.892182]  ? debugfs_file_put+0x100/0x100
[   57.896491]  do_dentry_open+0xfb0/0x18b0
[   57.900540]  ? kmsan_memcpy_origins+0x111/0x1b0
[   57.905204]  vfs_open+0xaf/0xe0
[   57.908472]  path_openat+0x1845/0x6e50
[   57.912360]  ? kmsan_set_origin_inline+0x6b/0x120
[   57.917200]  do_filp_open+0x259/0x610
[   57.921019]  do_sys_open+0x630/0x940
[   57.924723]  __se_sys_openat+0xcb/0xe0
[   57.928614]  __x64_sys_openat+0x56/0x70
[   57.932603]  do_syscall_64+0xb8/0x100
[   57.936403]  entry_SYSCALL_64_after_hwframe+0x63/0xe7
[   57.941579] RIP: 0033:0x47fcba
[   57.944766] 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
[   57.963663] RSP: 002b:000000c420031650 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
[   57.971360] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcba
[   57.978618] RDX: 0000000000080000 RSI: 000000c420084480 RDI: ffffffffffffff9c
[   57.985893] RBP: 000000c4200316d0 R08: 0000000000000000 R09: 0000000000000000
[   57.993148] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
[   58.000399] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
[   58.008146] Kernel Offset: disabled
[   58.011766] Rebooting in 86400 seconds..