[....] 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..