[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   29.176717] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   30.606968] random: sshd: uninitialized urandom read (32 bytes read)
[   31.006867] random: sshd: uninitialized urandom read (32 bytes read)
[   32.150298] random: sshd: uninitialized urandom read (32 bytes read)
[   32.363681] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.31' (ECDSA) to the list of known hosts.
[   38.012505] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   38.136457] ==================================================================
[   38.143859] BUG: KMSAN: kernel-infoleak in copy_page_to_iter+0x754/0x1b70
[   38.150767] CPU: 0 PID: 4480 Comm: syz-executor513 Not tainted 4.17.0+ #4
[   38.157682] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   38.167010] Call Trace:
[   38.169581]  dump_stack+0x185/0x1d0
[   38.173210]  kmsan_report+0x188/0x2a0
[   38.176988]  kmsan_internal_check_memory+0x17e/0x1f0
[   38.182072]  ? copy_page_to_iter+0x5f6/0x1b70
[   38.186548]  kmsan_copy_to_user+0x7a/0x160
[   38.190760]  copy_page_to_iter+0x754/0x1b70
[   38.195062]  process_vm_rw_core+0xf6a/0x1930
[   38.199454]  ? process_vm_rw+0x34f/0x500
[   38.203493]  process_vm_rw+0x3d0/0x500
[   38.207370]  __x64_sys_process_vm_readv+0x1a0/0x200
[   38.212362]  ? s_show+0xe80/0xe80
[   38.215793]  do_syscall_64+0x15b/0x230
[   38.219664]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   38.224844] RIP: 0033:0x4457b9
[   38.228008] RSP: 002b:00007f0daf55acd8 EFLAGS: 00000216 ORIG_RAX: 0000000000000136
[   38.235690] RAX: ffffffffffffffda RBX: 00000000006dac3c RCX: 00000000004457b9
[   38.242935] RDX: 0000000000000001 RSI: 0000000020000440 RDI: 000000000000117d
[   38.250181] RBP: 00000000006dac38 R08: 0000000000000001 R09: 0000000000000000
[   38.257436] R10: 00000000200006c0 R11: 0000000000000216 R12: 0000000000000000
[   38.266199] R13: 00007ffe15eb6c4f R14: 00007f0daf55b9c0 R15: 0000000000000004
[   38.273451] 
[   38.276381] Uninit was created at:
[   38.280114]  kmsan_alloc_meta_for_pages+0x161/0x3a0
[   38.285122]  kmsan_alloc_page+0x82/0xe0
[   38.289087]  __alloc_pages_nodemask+0xf7b/0x5cc0
[   38.293827]  alloc_pages_vma+0x1555/0x17f0
[   38.298043]  do_huge_pmd_wp_page+0x3123/0x50a0
[   38.302601]  handle_mm_fault+0x232c/0x7ec0
[   38.306816]  __do_page_fault+0xec6/0x1a10
[   38.310941]  do_page_fault+0xb7/0x250
[   38.314719]  page_fault+0x1e/0x30
[   38.318159] 
[   38.319764] Bytes 0-71 of 72 are uninitialized
[   38.324617] Memory access starts at ffff8801b4a00640
[   38.329699] ==================================================================
[   38.337035] Disabling lock debugging due to kernel taint
[   38.342470] Kernel panic - not syncing: panic_on_warn set ...
[   38.342470] 
[   38.349956] CPU: 0 PID: 4480 Comm: syz-executor513 Tainted: G    B             4.17.0+ #4
[   38.358242] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   38.367581] Call Trace:
[   38.370151]  dump_stack+0x185/0x1d0
[   38.373771]  panic+0x3d0/0x990
[   38.376943]  kmsan_report+0x29e/0x2a0
[   38.380721]  kmsan_internal_check_memory+0x17e/0x1f0
[   38.385804]  ? copy_page_to_iter+0x5f6/0x1b70
[   38.390301]  kmsan_copy_to_user+0x7a/0x160
[   38.394514]  copy_page_to_iter+0x754/0x1b70
[   38.398818]  process_vm_rw_core+0xf6a/0x1930
[   38.403214]  ? process_vm_rw+0x34f/0x500
[   38.407273]  process_vm_rw+0x3d0/0x500
[   38.411147]  __x64_sys_process_vm_readv+0x1a0/0x200
[   38.416162]  ? s_show+0xe80/0xe80
[   38.419593]  do_syscall_64+0x15b/0x230
[   38.423460]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   38.428626] RIP: 0033:0x4457b9
[   38.431791] RSP: 002b:00007f0daf55acd8 EFLAGS: 00000216 ORIG_RAX: 0000000000000136
[   38.439476] RAX: ffffffffffffffda RBX: 00000000006dac3c RCX: 00000000004457b9
[   38.446724] RDX: 0000000000000001 RSI: 0000000020000440 RDI: 000000000000117d
[   38.453970] RBP: 00000000006dac38 R08: 0000000000000001 R09: 0000000000000000
[   38.461230] R10: 00000000200006c0 R11: 0000000000000216 R12: 0000000000000000
[   38.468488] R13: 00007ffe15eb6c4f R14: 00007f0daf55b9c0 R15: 0000000000000004
[   38.476272] Dumping ftrace buffer:
[   38.479799]    (ftrace buffer empty)
[   38.483483] Kernel Offset: disabled
[   38.487082] Rebooting in 86400 seconds..