[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.269266] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.931919] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 25.374537] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.049917] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) [ 26.214346] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) Warning: Permanently added '10.128.0.33' (ECDSA) to the list of known hosts. [ 31.865955] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) executing program [ 31.959863] BUG: unable to handle kernel paging request at ffffeafff8c80008 [ 31.967335] IP: [] page_remove_rmap+0x2e/0x260 [ 31.973607] PGD 0 [ 31.975856] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.980818] Dumping ftrace buffer: [ 31.984334] (ftrace buffer empty) [ 31.988031] Modules linked in: [ 31.991344] CPU: 0 PID: 3688 Comm: syz-executor932 Not tainted 4.4.149-gf76bdbd #18 [ 31.999112] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.008442] task: ffff8800b2f20000 task.stack: ffff8801cea08000 [ 32.014472] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.023198] RSP: 0018:ffff8801cea0f948 EFLAGS: 00010246 [ 32.028665] RAX: dffffc0000000000 RBX: ffffeafff8c80000 RCX: 0000000000000000 [ 32.035916] RDX: 1ffffd5fff190001 RSI: ffffffff814bc8bf RDI: ffffeafff8c80008 [ 32.043169] RBP: ffff8801cea0f958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.050416] R10: 0000000000000001 R11: ffff8800b2f20000 R12: 0000000000000001 [ 32.057663] R13: 1ffff10039d41f2f R14: ffff8801cf07c800 R15: ffffeafff8c80000 [ 32.064960] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.073168] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 32.079025] CR2: ffffeafff8c80008 CR3: 00000001cfeb0000 CR4: 00000000001606f0 [ 32.086269] Stack: [ 32.088392] ffff8801cea0fbd8 0000000000000001 ffff8801cea0fa00 ffffffff8150a443 [ 32.096483] 00003ffe320001e0 00003ffe320001e0 0000000041b58ab3 ffffffff841ef837 [ 32.104496] ffffffff8150a240 00000000000004f0 ffff8801cec17790 ffff8801cea0f9c8 [ 32.112606] Call Trace: [ 32.115174] [] zap_huge_pmd+0x203/0x510 [ 32.120893] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.127445] [] unmap_single_vma+0xea3/0x1240 [ 32.133483] [] ? vm_normal_page+0x230/0x230 [ 32.139432] [] ? __put_single_page+0x60/0x60 [ 32.145464] [] unmap_vmas+0x81/0xd0 [ 32.150724] [] exit_mmap+0x1c9/0x3a0 [ 32.156066] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.162537] [] ? up_write+0x1a/0x60 [ 32.167808] [] mmput+0xf8/0x2d0 [ 32.172715] [] do_exit+0x8d8/0x26b0 [ 32.177965] [] ? file_map_prot_check+0x193/0x310 [ 32.184347] [] ? release_task.part.17+0x1200/0x1200 [ 32.190991] [] ? SyS_mprotect+0x41e/0x640 [ 32.196765] [] ? up_write+0x1a/0x60 [ 32.202021] [] ? SyS_mprotect+0x423/0x640 [ 32.207803] [] do_group_exit+0x111/0x330 [ 32.213490] [] ? do_group_exit+0x330/0x330 [ 32.219365] [] SyS_exit_group+0x1d/0x20 [ 32.224997] [] do_fast_syscall_32+0x324/0x8b0 [ 32.231119] [] sysenter_flags_fixed+0xd/0x1a [ 32.237146] 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 [ 32.264834] RIP [] page_remove_rmap+0x2e/0x260 [ 32.271228] RSP [ 32.274843] CR2: ffffeafff8c80008 [ 32.278269] ---[ end trace 55f96109a09ca463 ]--- [ 32.283000] Kernel panic - not syncing: Fatal exception [ 32.288659] Dumping ftrace buffer: [ 32.292176] (ftrace buffer empty) [ 32.295865] Kernel Offset: disabled [ 32.299471] Rebooting in 86400 seconds..