[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.330819] 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: [ 24.200994] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 24.532105] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 25.267500] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 25.429987] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) Warning: Permanently added '10.128.10.8' (ECDSA) to the list of known hosts. [ 31.041225] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) executing program [ 31.136873] BUG: unable to handle kernel paging request at ffffeafffd3c8008 [ 31.144384] IP: [] page_remove_rmap+0x2e/0x260 [ 31.150632] PGD 0 [ 31.152879] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.157824] Dumping ftrace buffer: [ 31.161336] (ftrace buffer empty) [ 31.165086] Modules linked in: [ 31.168383] CPU: 0 PID: 3689 Comm: syz-executor671 Not tainted 4.4.149-gf76bdbd #18 [ 31.176150] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.185484] task: ffff8800b2c56000 task.stack: ffff8800b7018000 [ 31.191561] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.200271] RSP: 0018:ffff8800b701f948 EFLAGS: 00010246 [ 31.205898] RAX: dffffc0000000000 RBX: ffffeafffd3c8000 RCX: 0000000000000000 [ 31.213229] RDX: 1ffffd5fffa79001 RSI: ffffffff814bc8bf RDI: ffffeafffd3c8008 [ 31.220482] RBP: ffff8800b701f958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.227727] R10: 0000000000000001 R11: ffff8800b2c56000 R12: 0000000000000001 [ 31.234987] R13: 1ffff10016e03f2f R14: ffff8800b6dbd800 R15: ffffeafffd3c8000 [ 31.242300] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.250617] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 31.256479] CR2: ffffeafffd3c8008 CR3: 00000000b55e9000 CR4: 00000000001606f0 [ 31.263781] Stack: [ 31.265909] ffff8800b701fbd8 0000000000000001 ffff8800b701fa00 ffffffff8150a443 [ 31.273905] 00003fff4f2001e0 00003fff4f2001e0 0000000041b58ab3 ffffffff841ef837 [ 31.282044] ffffffff8150a240 00000000000004f0 ffff8801cfcd3e70 ffff8800b701f9c8 [ 31.290029] Call Trace: [ 31.292594] [] zap_huge_pmd+0x203/0x510 [ 31.298197] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.304759] [] unmap_single_vma+0xea3/0x1240 [ 31.310817] [] ? vm_normal_page+0x230/0x230 [ 31.316792] [] ? __put_single_page+0x60/0x60 [ 31.322838] [] unmap_vmas+0x81/0xd0 [ 31.328101] [] exit_mmap+0x1c9/0x3a0 [ 31.333439] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.339906] [] ? up_write+0x1a/0x60 [ 31.345171] [] mmput+0xf8/0x2d0 [ 31.350121] [] do_exit+0x8d8/0x26b0 [ 31.355376] [] ? file_map_prot_check+0x193/0x310 [ 31.361760] [] ? release_task.part.17+0x1200/0x1200 [ 31.368406] [] ? SyS_mprotect+0x41e/0x640 [ 31.374187] [] ? up_write+0x1a/0x60 [ 31.379465] [] ? SyS_mprotect+0x423/0x640 [ 31.385242] [] do_group_exit+0x111/0x330 [ 31.391028] [] ? do_group_exit+0x330/0x330 [ 31.396995] [] SyS_exit_group+0x1d/0x20 [ 31.402601] [] do_fast_syscall_32+0x324/0x8b0 [ 31.408770] [] sysenter_flags_fixed+0xd/0x1a [ 31.414805] 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 [ 31.442018] RIP [] page_remove_rmap+0x2e/0x260 [ 31.448346] RSP [ 31.451944] CR2: ffffeafffd3c8008 [ 31.455373] ---[ end trace a186a846a3409137 ]--- [ 31.460101] Kernel panic - not syncing: Fatal exception [ 31.465813] Dumping ftrace buffer: [ 31.469337] (ftrace buffer empty) [ 31.473027] Kernel Offset: disabled [ 31.476629] Rebooting in 86400 seconds..