[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.326235] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.338010] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 22.669852] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 23.681908] random: sshd: uninitialized urandom read (32 bytes read, 120 bits of entropy available) [ 23.851606] random: sshd: uninitialized urandom read (32 bytes read, 124 bits of entropy available) [ 24.666763] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.42' (ECDSA) to the list of known hosts. executing program [ 29.383732] ------------[ cut here ]------------ [ 29.388934] WARNING: CPU: 1 PID: 3780 at arch/x86/mm/pat.c:1003 untrack_pfn+0x204/0x2a0() [ 29.398058] Kernel panic - not syncing: panic_on_warn set ... [ 29.398058] [ 29.405404] CPU: 1 PID: 3780 Comm: syzkaller934269 Not tainted 4.4.119-g855ea74 #27 [ 29.413170] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.422497] 0000000000000000 6de82625fc974cdd ffff8801d908f778 ffffffff81d0402d [ 29.430468] ffffffff83843b40 ffff8801d908f850 ffffffff8383da60 0000000000000009 [ 29.438442] 00000000000003eb ffff8801d908f840 ffffffff8141aaea 0000000041b58ab3 [ 29.446434] Call Trace: [ 29.449000] [] dump_stack+0xc1/0x124 [ 29.454343] [] panic+0x1aa/0x388 [ 29.459347] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 29.466251] [] ? pm_qos_get_value.part.4+0xb/0xb [ 29.472629] [] ? warn_slowpath_common+0x10a/0x140 [ 29.479093] [] warn_slowpath_common+0x125/0x140 [ 29.485386] [] ? untrack_pfn+0x204/0x2a0 [ 29.491065] [] warn_slowpath_null+0x29/0x30 [ 29.497006] [] untrack_pfn+0x204/0x2a0 [ 29.502511] [] ? track_pfn_insert+0x110/0x110 [ 29.508627] [] ? depot_save_stack+0x1c3/0x640 [ 29.514744] [] unmap_single_vma+0xf81/0x12a0 [ 29.520774] [] ? entry_SYSCALL_64_fastpath+0x1c/0x98 [ 29.527507] [] ? vm_normal_page+0x200/0x200 [ 29.533449] [] unmap_vmas+0x81/0xd0 [ 29.538695] [] unmap_region+0x1ad/0x330 [ 29.544289] [] ? __vma_link_file+0x160/0x160 [ 29.550324] [] ? flush_tlb_mm_range+0x10f/0x560 [ 29.556616] [] ? vma_compute_subtree_gap+0x190/0x200 [ 29.563340] [] ? vma_rb_erase+0x60a/0x9f0 [ 29.569108] [] do_munmap+0x70f/0xec0 [ 29.574441] [] move_vma+0x511/0x9b0 [ 29.579689] [] ? move_page_tables+0xe20/0xe20 [ 29.585805] [] ? selinux_mmap_addr+0x1f/0xf0 [ 29.591833] [] ? security_mmap_addr+0x79/0xa0 [ 29.597951] [] ? get_unmapped_area+0x271/0x2f0 [ 29.604154] [] SyS_mremap+0xb8b/0xe60 [ 29.609573] [] ? move_vma+0x9b0/0x9b0 [ 29.615005] [] ? _raw_spin_unlock_irq+0x27/0x50 [ 29.621295] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 29.628110] [] ? int_ret_from_sys_call+0x52/0xa3 [ 29.634486] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 29.641511] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 29.648594] Dumping ftrace buffer: [ 29.652173] (ftrace buffer empty) [ 29.655853] Kernel Offset: disabled [ 29.659478] Rebooting in 86400 seconds..