[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.845670] 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: [ 22.529338] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 22.885375] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 23.596224] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) [ 23.754650] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) Warning: Permanently added '10.128.10.50' (ECDSA) to the list of known hosts. [ 29.452907] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) executing program [ 29.537498] BUG: unable to handle kernel paging request at ffffeafff8c40008 [ 29.544871] IP: [] page_remove_rmap+0x2e/0x260 [ 29.551120] PGD 0 [ 29.553365] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.558352] Dumping ftrace buffer: [ 29.561864] (ftrace buffer empty) [ 29.565554] Modules linked in: [ 29.568899] CPU: 1 PID: 3683 Comm: syz-executor205 Not tainted 4.4.149-gf76bdbd #18 [ 29.576666] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.586004] task: ffff8801cf129800 task.stack: ffff8801ce4f0000 [ 29.592038] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 29.600735] RSP: 0018:ffff8801ce4f7948 EFLAGS: 00010246 [ 29.606162] RAX: dffffc0000000000 RBX: ffffeafff8c40000 RCX: 0000000000000000 [ 29.613421] RDX: 1ffffd5fff188001 RSI: ffffffff814bc8bf RDI: ffffeafff8c40008 [ 29.620761] RBP: ffff8801ce4f7958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 29.628009] R10: 0000000000000001 R11: ffff8801cf129800 R12: 0000000000000001 [ 29.635262] R13: 1ffff10039c9ef2f R14: ffff8801d20c0800 R15: ffffeafff8c40000 [ 29.642513] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.650717] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 29.656575] CR2: ffffeafff8c40008 CR3: 00000001d2386000 CR4: 00000000001606f0 [ 29.663822] Stack: [ 29.665954] ffff8801ce4f7bd8 0000000000000001 ffff8801ce4f7a00 ffffffff8150a443 [ 29.673965] 00003ffe310001e0 00003ffe310001e0 0000000041b58ab3 ffffffff841ef837 [ 29.681961] ffffffff8150a240 00000000000004f0 ffff8801cfb96e18 ffff8801ce4f79c8 [ 29.689950] Call Trace: [ 29.692514] [] zap_huge_pmd+0x203/0x510 [ 29.698115] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 29.704696] [] unmap_single_vma+0xea3/0x1240 [ 29.710737] [] ? vm_normal_page+0x230/0x230 [ 29.716702] [] ? __put_single_page+0x60/0x60 [ 29.722737] [] unmap_vmas+0x81/0xd0 [ 29.727994] [] exit_mmap+0x1c9/0x3a0 [ 29.733335] [] ? SyS_remap_file_pages+0x870/0x870 [ 29.739804] [] ? up_write+0x1a/0x60 [ 29.745059] [] mmput+0xf8/0x2d0 [ 29.749964] [] do_exit+0x8d8/0x26b0 [ 29.755303] [] ? file_map_prot_check+0x193/0x310 [ 29.761686] [] ? release_task.part.17+0x1200/0x1200 [ 29.768331] [] ? SyS_mprotect+0x41e/0x640 [ 29.774112] [] ? up_write+0x1a/0x60 [ 29.779389] [] ? SyS_mprotect+0x423/0x640 [ 29.785187] [] do_group_exit+0x111/0x330 [ 29.790874] [] ? do_group_exit+0x330/0x330 [ 29.797004] [] SyS_exit_group+0x1d/0x20 [ 29.802605] [] do_fast_syscall_32+0x324/0x8b0 [ 29.808729] [] sysenter_flags_fixed+0xd/0x1a [ 29.814759] Code: e5 41 54 53 48 89 fb e8 e1 77 e9 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 de 01 00 00 43 08 01 0f 84 4e 01 00 00 e8 b3 77 e9 ff f0 83 43 18 ff 78 [ 29.841639] RIP [] page_remove_rmap+0x2e/0x260 [ 29.847973] RSP [ 29.851570] CR2: ffffeafff8c40008 [ 29.854998] ---[ end trace 8c01d755917f1f0e ]--- [ 29.859725] Kernel panic - not syncing: Fatal exception [ 29.865368] Dumping ftrace buffer: [ 29.868888] (ftrace buffer empty) [ 29.872573] Kernel Offset: disabled [ 29.876174] Rebooting in 86400 seconds..