[ 16.249182] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.206796] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.619365] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.356346] random: sshd: uninitialized urandom read (32 bytes read, 85 bits of entropy available) [ 21.535076] random: sshd: uninitialized urandom read (32 bytes read, 90 bits of entropy available) Warning: Permanently added '10.128.15.223' (ECDSA) to the list of known hosts. [ 26.915750] random: sshd: uninitialized urandom read (32 bytes read, 96 bits of entropy available) executing program [ 27.013254] ------------[ cut here ]------------ [ 27.018056] WARNING: CPU: 1 PID: 3313 at mm/page_alloc.c:3069 __alloc_pages_nodemask+0x62a/0x16e0() [ 27.028023] Kernel panic - not syncing: panic_on_warn set ... [ 27.028023] [ 27.035403] CPU: 1 PID: 3313 Comm: syzkaller085214 Not tainted 4.4.107-g610c835 #12 [ 27.043169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.052495] 0000000000000000 2d2b1dd93cbe973f ffff8800b411f458 ffffffff81d0457d [ 27.060453] ffffffff838429a0 ffff8800b411f530 ffffffff8389a0c0 0000000000000009 [ 27.068400] 0000000000000bfd ffff8800b411f520 ffffffff8141774a 0000000041b58ab3 [ 27.076347] Call Trace: [ 27.078925] [] dump_stack+0xc1/0x124 [ 27.084255] [] panic+0x1aa/0x388 [ 27.089238] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 27.096131] [] ? pm_qos_get_value.part.4+0xb/0xb [ 27.102505] [] ? warn_slowpath_common+0x10a/0x140 [ 27.108961] [] warn_slowpath_common+0x125/0x140 [ 27.115244] [] ? __alloc_pages_nodemask+0x62a/0x16e0 [ 27.121961] [] warn_slowpath_null+0x29/0x30 [ 27.127898] [] __alloc_pages_nodemask+0x62a/0x16e0 [ 27.134442] [] ? mark_held_locks+0xaf/0x100 [ 27.140378] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 27.147271] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 27.154076] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 27.160966] [] ? depot_save_stack+0x1c3/0x640 [ 27.167083] [] ? save_stack+0xa3/0xd0 [ 27.172512] [] ? save_stack+0x43/0xd0 [ 27.177932] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 27.185085] [] ? blk_trace_ioctl+0x1de/0x300 [ 27.191119] [] ? blkdev_ioctl+0xa90/0x1990 [ 27.196969] [] ? block_ioctl+0xde/0x120 [ 27.202565] [] ? do_vfs_ioctl+0x7aa/0xee0 [ 27.208335] [] ? SyS_ioctl+0x8f/0xc0 [ 27.213673] [] ? entry_SYSCALL_64_fastpath+0x16/0x76 [ 27.220391] [] ? dump_trace+0x14c/0x350 [ 27.225988] [] ? save_stack_trace+0x26/0x50 [ 27.231925] [] ? __lock_is_held+0xa1/0xf0 [ 27.237689] [] alloc_kmem_pages+0x12/0x20 [ 27.243454] [] kmalloc_order+0x1f/0x70 [ 27.248957] [] kmalloc_order_trace+0x1f/0x1a0 [ 27.255070] [] __kmalloc+0x1a6/0x320 [ 27.260399] [] relay_open_buf.part.12+0xc8/0x930 [ 27.266781] [] ? _find_next_bit.part.0+0xe0/0x120 [ 27.273246] [] ? memcpy+0x45/0x50 [ 27.278315] [] relay_open+0x472/0x760 [ 27.283744] [] do_blk_trace_setup+0x3e9/0x950 [ 27.289861] [] blk_trace_setup+0xcf/0x170 [ 27.295629] [] ? do_blk_trace_setup+0x950/0x950 [ 27.301919] [] ? disk_name+0xc7/0x140 [ 27.307362] [] blk_trace_ioctl+0x1de/0x300 [ 27.313223] [] ? compat_blk_trace_setup+0x230/0x230 [ 27.319862] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 27.326857] [] ? avc_ss_reset+0x110/0x110 [ 27.332629] [] blkdev_ioctl+0xa97/0x1990 [ 27.338308] [] ? blkpg_ioctl+0x910/0x910 [ 27.343992] [] ? check_preemption_disabled+0x3b/0x200 [ 27.350815] [] ? handle_mm_fault+0xbf5/0x3190 [ 27.356947] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.362888] [] block_ioctl+0xde/0x120 [ 27.368302] [] ? blkdev_read_iter+0x170/0x170 [ 27.374413] [] do_vfs_ioctl+0x7aa/0xee0 [ 27.380001] [] ? ioctl_preallocate+0x1f0/0x1f0 [ 27.386199] [] ? __do_page_fault+0x380/0xa00 [ 27.392221] [] ? security_file_ioctl+0x89/0xb0 [ 27.398420] [] SyS_ioctl+0x8f/0xc0 [ 27.403581] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 27.410689] Dumping ftrace buffer: [ 27.414249] (ftrace buffer empty) [ 27.417926] Kernel Offset: disabled [ 27.421544] Rebooting in 86400 seconds..