[ 15.186015] random: sshd: uninitialized urandom read (32 bytes read, 32 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: [ 20.738115] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.940922] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.724320] random: sshd: uninitialized urandom read (32 bytes read, 97 bits of entropy available) [ 37.818553] random: sshd: uninitialized urandom read (32 bytes read, 107 bits of entropy available) Warning: Permanently added '10.128.15.229' (ECDSA) to the list of known hosts. [ 43.224412] random: sshd: uninitialized urandom read (32 bytes read, 113 bits of entropy available) executing program [ 43.313438] ------------[ cut here ]------------ [ 43.318724] WARNING: CPU: 1 PID: 3321 at mm/page_alloc.c:3069 __alloc_pages_nodemask+0x62a/0x16e0() [ 43.327976] Kernel panic - not syncing: panic_on_warn set ... [ 43.327976] [ 43.335307] CPU: 1 PID: 3321 Comm: syzkaller251590 Not tainted 4.4.107-g610c835 #12 [ 43.343063] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.352381] 0000000000000000 4d747aca8932c1e0 ffff8801d1f77458 ffffffff81d0457d [ 43.360328] ffffffff838429a0 ffff8801d1f77530 ffffffff8389a0c0 0000000000000009 [ 43.368270] 0000000000000bfd ffff8801d1f77520 ffffffff8141774a 0000000041b58ab3 [ 43.376212] Call Trace: [ 43.378767] [] dump_stack+0xc1/0x124 [ 43.384100] [] panic+0x1aa/0x388 [ 43.389080] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 43.395974] [] ? pm_qos_get_value.part.4+0xb/0xb [ 43.402341] [] ? warn_slowpath_common+0x10a/0x140 [ 43.408795] [] warn_slowpath_common+0x125/0x140 [ 43.415075] [] ? __alloc_pages_nodemask+0x62a/0x16e0 [ 43.421787] [] warn_slowpath_null+0x29/0x30 [ 43.427719] [] __alloc_pages_nodemask+0x62a/0x16e0 [ 43.434261] [] ? mark_held_locks+0xaf/0x100 [ 43.440197] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 43.447084] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 43.453887] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 43.460775] [] ? depot_save_stack+0x1c3/0x640 [ 43.466886] [] ? save_stack+0xa3/0xd0 [ 43.472307] [] ? save_stack+0x43/0xd0 [ 43.477721] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 43.484873] [] ? blk_trace_ioctl+0x1de/0x300 [ 43.490894] [] ? blkdev_ioctl+0xa90/0x1990 [ 43.496740] [] ? block_ioctl+0xde/0x120 [ 43.502329] [] ? do_vfs_ioctl+0x7aa/0xee0 [ 43.508095] [] ? SyS_ioctl+0x8f/0xc0 [ 43.513422] [] ? entry_SYSCALL_64_fastpath+0x16/0x76 [ 43.520140] [] ? dump_trace+0x14c/0x350 [ 43.525737] [] ? save_stack_trace+0x26/0x50 [ 43.531670] [] ? __lock_is_held+0xa1/0xf0 [ 43.537432] [] alloc_kmem_pages+0x12/0x20 [ 43.543195] [] kmalloc_order+0x1f/0x70 [ 43.548702] [] kmalloc_order_trace+0x1f/0x1a0 [ 43.554810] [] __kmalloc+0x1a6/0x320 [ 43.560139] [] relay_open_buf.part.12+0xc8/0x930 [ 43.566508] [] ? _find_next_bit.part.0+0xe0/0x120 [ 43.572972] [] ? memcpy+0x45/0x50 [ 43.578041] [] relay_open+0x472/0x760 [ 43.583457] [] do_blk_trace_setup+0x3e9/0x950 [ 43.589574] [] blk_trace_setup+0xcf/0x170 [ 43.595335] [] ? do_blk_trace_setup+0x950/0x950 [ 43.601619] [] ? disk_name+0xc7/0x140 [ 43.607031] [] blk_trace_ioctl+0x1de/0x300 [ 43.612878] [] ? compat_blk_trace_setup+0x230/0x230 [ 43.619508] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 43.626483] [] ? avc_ss_reset+0x110/0x110 [ 43.632243] [] blkdev_ioctl+0xa97/0x1990 [ 43.637915] [] ? blkpg_ioctl+0x910/0x910 [ 43.643587] [] ? check_preemption_disabled+0x3b/0x200 [ 43.650389] [] ? handle_mm_fault+0xbf5/0x3190 [ 43.656496] [] ? _raw_spin_unlock+0x2c/0x50 [ 43.662429] [] block_ioctl+0xde/0x120 [ 43.667843] [] ? blkdev_read_iter+0x170/0x170 [ 43.673951] [] do_vfs_ioctl+0x7aa/0xee0 [ 43.679536] [] ? ioctl_preallocate+0x1f0/0x1f0 [ 43.685815] [] ? __do_page_fault+0x380/0xa00 [ 43.691839] [] ? security_file_ioctl+0x89/0xb0 [ 43.698034] [] SyS_ioctl+0x8f/0xc0 [ 43.703189] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 43.709854] Dumping ftrace buffer: [ 43.713396] (ftrace buffer empty) [ 43.717071] Kernel Offset: disabled [ 43.720693] Rebooting in 86400 seconds..