[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   20.471425] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   23.794107] random: sshd: uninitialized urandom read (32 bytes read)
[   24.352912] random: sshd: uninitialized urandom read (32 bytes read)
[   25.135727] random: sshd: uninitialized urandom read (32 bytes read)
[   25.296920] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.45' (ECDSA) to the list of known hosts.
[   30.726923] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   30.834990] ------------[ cut here ]------------
[   30.839975] memory commitment underflow
[   30.840079] WARNING: CPU: 0 PID: 4515 at mm/util.c:640 __vm_enough_memory+0x738/0x960
[   30.852005] Kernel panic - not syncing: panic_on_warn set ...
[   30.852005] 
[   30.859366] CPU: 0 PID: 4515 Comm: syz-executor312 Not tainted 4.17.0-rc6+ #66
[   30.866707] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   30.876050] Call Trace:
[   30.878651]  dump_stack+0x1b9/0x294
[   30.882273]  ? dump_stack_print_info.cold.2+0x52/0x52
[   30.887460]  ? __vm_enough_memory+0x670/0x960
[   30.891949]  panic+0x22f/0x4de
[   30.895127]  ? add_taint.cold.5+0x16/0x16
[   30.899266]  ? __warn.cold.8+0x148/0x1b3
[   30.903309]  ? __warn.cold.8+0x117/0x1b3
[   30.907353]  ? __vm_enough_memory+0x738/0x960
[   30.911839]  __warn.cold.8+0x163/0x1b3
[   30.915707]  ? __vm_enough_memory+0x738/0x960
[   30.920196]  report_bug+0x252/0x2d0
[   30.923807]  do_error_trap+0x1de/0x490
[   30.927680]  ? math_error+0x420/0x420
[   30.931472]  ? vprintk_default+0x28/0x30
[   30.935516]  ? vprintk_func+0x81/0xe7
[   30.939300]  ? printk+0x9e/0xba
[   30.942566]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   30.947392]  do_invalid_op+0x1b/0x20
[   30.951091]  invalid_op+0x14/0x20
[   30.954536] RIP: 0010:__vm_enough_memory+0x738/0x960
[   30.959615] RSP: 0018:ffff8801ad187740 EFLAGS: 00010282
[   30.964968] RAX: 000000000000001b RBX: 1ffff10035a30eec RCX: ffffffff8160bcad
[   30.972219] RDX: 0000000000000000 RSI: ffffffff81610961 RDI: 0000000000000001
[   30.979471] RBP: ffff8801ad187928 R08: ffff8801ae46c0c0 R09: 0000000000000006
[   30.986738] R10: ffff8801ae46c0c0 R11: 0000000000000000 R12: ffff8801ad187900
[   30.993998] R13: 0000000000000c67 R14: ffffffff88e08360 R15: 0000000000000021
[   31.001446]  ? console_unlock+0x8ad/0x1100
[   31.005685]  ? vprintk_func+0x81/0xe7
[   31.009490]  ? vm_commit_limit+0xd0/0xd0
[   31.013547]  ? __sanitizer_cov_trace_cmp8+0x18/0x20
[   31.018559]  ? may_expand_vm+0x1e3/0x8b0
[   31.022602]  ? copy_vma+0xe00/0xe00
[   31.026221]  ? __sanitizer_cov_trace_switch+0x53/0x90
[   31.031398]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   31.036917]  ? cap_capable+0x1f9/0x260
[   31.040792]  security_vm_enough_memory_mm+0x9d/0xc0
[   31.045801]  mmap_region+0x37b/0x1870
[   31.049588]  ? unmapped_area+0xac0/0xac0
[   31.053654]  ? __x64_sys_brk+0x790/0x790
[   31.057705]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   31.062715]  ? arch_get_unmapped_area+0x750/0x750
[   31.067545]  ? cap_mmap_addr+0x52/0x130
[   31.071504]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   31.077041]  ? security_mmap_addr+0x80/0xa0
[   31.081359]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   31.086877]  ? get_unmapped_area+0x292/0x3b0
[   31.091283]  ? __sanitizer_cov_trace_switch+0x53/0x90
[   31.096454]  do_mmap+0x9d2/0x12e0
[   31.099889]  ? mmap_region+0x1870/0x1870
[   31.103936]  ? vm_mmap_pgoff+0x1a1/0x2a0
[   31.107990]  ? down_read_killable+0x1f0/0x1f0
[   31.112474]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   31.117995]  ? security_mmap_file+0x166/0x1b0
[   31.122482]  vm_mmap_pgoff+0x1fb/0x2a0
[   31.126358]  ? vma_is_stack_for_current+0xd0/0xd0
[   31.131188]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   31.136800]  ksys_mmap_pgoff+0x26e/0x640
[   31.140848]  ? find_mergeable_anon_vma+0xd0/0xd0
[   31.145606]  ? mprotect_fixup+0x700/0x700
[   31.149747]  ? __ia32_sys_fallocate+0xf0/0xf0
[   31.154228]  __x64_sys_mmap+0xe9/0x1b0
[   31.158099]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   31.163099]  do_syscall_64+0x1b1/0x800
[   31.166968]  ? syscall_return_slowpath+0x5c0/0x5c0
[   31.171879]  ? syscall_return_slowpath+0x30f/0x5c0
[   31.176797]  ? entry_SYSCALL_64_after_hwframe+0x59/0xbe
[   31.182153]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   31.186980]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   31.192159] RIP: 0033:0x44558a
[   31.195327] RSP: 002b:00007ffc6bc97228 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
[   31.203068] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000044558a
[   31.210322] RDX: 0000000000000003 RSI: 0000000000021000 RDI: 0000000000000000
[   31.217576] RBP: ffffffffffffffff R08: ffffffffffffffff R09: 0000000000000000
[   31.224836] R10: 0000000000020022 R11: 0000000000000246 R12: 0000000000000000
[   31.232093] R13: 0000000000021000 R14: 0000000000020022 R15: 0000000000000000
[   31.239990] Dumping ftrace buffer:
[   31.243727]    (ftrace buffer empty)
[   31.247417] Kernel Offset: disabled
[   31.251026] Rebooting in 86400 seconds..