[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 17.895551] random: sshd: uninitialized urandom read (32 bytes read, 29 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.916636] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [ 20.163045] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [ 21.126126] random: sshd: uninitialized urandom read (32 bytes read, 118 bits of entropy available) [ 21.281370] random: sshd: uninitialized urandom read (32 bytes read, 122 bits of entropy available) Warning: Permanently added '10.128.0.41' (ECDSA) to the list of known hosts. [ 26.837638] random: sshd: uninitialized urandom read (32 bytes read, 128 bits of entropy available) executing program [ 26.920012] ------------[ cut here ]------------ [ 26.924798] WARNING: CPU: 1 PID: 3603 at mm/page_alloc.c:3069 __alloc_pages_nodemask+0x62a/0x15f0() [ 26.934060] Kernel panic - not syncing: panic_on_warn set ... [ 26.934060] [ 26.941405] CPU: 1 PID: 3603 Comm: syzkaller538165 Not tainted 4.4.125-g38f41ec #63 [ 26.949167] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.958491] 0000000000000000 eb5b24f12c274657 ffff8801ce75f4e8 ffffffff81d067bd [ 26.966465] ffffffff83843c60 ffff8801ce75f5c0 ffffffff8389b480 0000000000000009 [ 26.974444] 0000000000000bfd ffff8801ce75f5b0 ffffffff8141b46a 0000000041b58ab3 [ 26.982418] Call Trace: [ 26.984979] [] dump_stack+0xc1/0x124 [ 26.990310] [] panic+0x1aa/0x388 [ 26.995295] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 27.002190] [] ? pm_qos_get_value.part.4+0xb/0xb [ 27.008566] [] ? warn_slowpath_common+0x10a/0x140 [ 27.015027] [] warn_slowpath_common+0x125/0x140 [ 27.021315] [] ? __alloc_pages_nodemask+0x62a/0x15f0 [ 27.028034] [] warn_slowpath_null+0x29/0x30 [ 27.033973] [] __alloc_pages_nodemask+0x62a/0x15f0 [ 27.040521] [] ? depot_save_stack+0x1c3/0x640 [ 27.046636] [] ? save_stack+0xa3/0xd0 [ 27.052055] [] ? save_stack+0x43/0xd0 [ 27.057472] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 27.064629] [] ? blk_trace_ioctl+0x1de/0x2b0 [ 27.070657] [] ? blkdev_ioctl+0x9d0/0x1990 [ 27.076515] [] ? block_ioctl+0xde/0x120 [ 27.082107] [] ? do_vfs_ioctl+0x7aa/0xee0 [ 27.087871] [] ? SyS_ioctl+0x8f/0xc0 [ 27.093206] [] ? entry_SYSCALL_64_fastpath+0x22/0x9e [ 27.099930] [] ? dump_trace+0x14f/0x350 [ 27.105525] [] ? save_stack_trace+0x26/0x50 [ 27.111465] [] ? __lock_is_held+0xa1/0xf0 [ 27.117233] [] alloc_kmem_pages+0x12/0x20 [ 27.123001] [] kmalloc_order+0x1f/0x70 [ 27.128508] [] kmalloc_order_trace+0x1f/0x1a0 [ 27.134624] [] __kmalloc+0x1a6/0x320 [ 27.139958] [] relay_open_buf.part.12+0xc8/0x930 [ 27.146337] [] ? _find_next_bit.part.0+0xe0/0x120 [ 27.152797] [] ? memcpy+0x45/0x50 [ 27.157871] [] relay_open+0x472/0x760 [ 27.163289] [] do_blk_trace_setup+0x3e9/0x930 [ 27.169403] [] blk_trace_setup+0xcf/0x180 [ 27.175169] [] ? do_blk_trace_setup+0x930/0x930 [ 27.181457] [] ? disk_name+0xc7/0x140 [ 27.186878] [] blk_trace_ioctl+0x1de/0x2b0 [ 27.192731] [] ? compat_blk_trace_setup+0x1f0/0x1f0 [ 27.199374] [] ? SyS_open+0x2d/0x40 [ 27.204622] [] ? avc_ss_reset+0x110/0x110 [ 27.210389] [] blkdev_ioctl+0xa97/0x1990 [ 27.216068] [] ? blkpg_ioctl+0x910/0x910 [ 27.221747] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 27.228557] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 27.235451] [] ? debug_check_no_obj_freed+0x2d2/0x9b0 [ 27.242264] [] ? __fd_install+0x224/0x5f0 [ 27.248028] [] ? quarantine_put+0xab/0x180 [ 27.253883] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 27.260692] [] ? check_preemption_disabled+0x3b/0x200 [ 27.267502] [] ? check_preemption_disabled+0x3b/0x200 [ 27.274312] [] block_ioctl+0xde/0x120 [ 27.279732] [] ? blkdev_read_iter+0x170/0x170 [ 27.285853] [] do_vfs_ioctl+0x7aa/0xee0 [ 27.291451] [] ? ioctl_preallocate+0x1f0/0x1f0 [ 27.297653] [] ? do_sys_open+0x259/0x660 [ 27.303335] [] ? filp_open+0x70/0x70 [ 27.308670] [] ? security_file_ioctl+0x89/0xb0 [ 27.314873] [] SyS_ioctl+0x8f/0xc0 [ 27.320043] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 27.327139] Dumping ftrace buffer: [ 27.330695] (ftrace buffer empty) [ 27.334376] Kernel Offset: disabled [ 27.337992] Rebooting in 86400 seconds..