[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.494111] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.718782] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 28.102734] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 28.666231] random: sshd: uninitialized urandom read (32 bytes read, 55 bits of entropy available) [ 28.856644] random: sshd: uninitialized urandom read (32 bytes read, 58 bits of entropy available) Warning: Permanently added '10.128.0.33' (ECDSA) to the list of known hosts. [ 34.520632] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) executing program [ 34.608732] BUG: unable to handle kernel paging request at ffffeafff8e60008 [ 34.616435] IP: [] page_remove_rmap+0x2e/0x260 [ 34.622680] PGD 0 [ 34.624919] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.629864] Dumping ftrace buffer: [ 34.633382] (ftrace buffer empty) [ 34.637069] Modules linked in: [ 34.640359] CPU: 0 PID: 3847 Comm: syz-executor184 Not tainted 4.4.150-g5541782 #83 [ 34.648128] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.657459] task: ffff8801d2d80000 task.stack: ffff8801d2a78000 [ 34.663489] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 34.672170] RSP: 0018:ffff8801d2a7f9c0 EFLAGS: 00010246 [ 34.677596] RAX: dffffc0000000000 RBX: ffffeafff8e60000 RCX: ffffea0007198000 [ 34.684840] RDX: 1ffffd5fff1cc001 RSI: ffffffff814bceaf RDI: ffffeafff8e60008 [ 34.692186] RBP: ffff8801d2a7f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 34.699562] R10: 0000000000000001 R11: ffff8801d2d80000 R12: 0000000000000001 [ 34.706814] R13: 1ffff1003a54ff3e R14: ffff8801cc639808 R15: ffffeafff8e60000 [ 34.714061] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 34.722262] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.728118] CR2: ffffeafff8e60008 CR3: 00000001cc650000 CR4: 00000000001606f0 [ 34.735365] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.742612] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.749979] Stack: [ 34.752111] ffff8801d2a7fc50 0000000000000001 ffff8801d2a7fa78 ffffffff8150ad13 [ 34.760100] 00003ffe398001a0 00003ffe398001a0 0000000041b58ab3 ffffffff841ef837 [ 34.768096] ffffffff8150ab10 00000000000004f0 ffff8801cc45c630 ffff8801d2a7fa40 [ 34.776093] Call Trace: [ 34.778659] [] zap_huge_pmd+0x203/0x510 [ 34.784268] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 34.790846] [] unmap_single_vma+0xea3/0x1240 [ 34.796894] [] ? vm_normal_page+0x280/0x280 [ 34.802849] [] ? __put_single_page+0x60/0x60 [ 34.808890] [] unmap_vmas+0x81/0xd0 [ 34.814140] [] exit_mmap+0x1c9/0x3a0 [ 34.819479] [] ? SyS_remap_file_pages+0x870/0x870 [ 34.825949] [] ? up_write+0x1a/0x60 [ 34.831214] [] mmput+0xf8/0x2d0 [ 34.836124] [] do_exit+0x8d8/0x26b0 [ 34.841376] [] ? file_map_prot_check+0x193/0x310 [ 34.847755] [] ? release_task.part.17+0x1200/0x1200 [ 34.854538] [] ? SyS_mprotect+0x41e/0x640 [ 34.860314] [] ? up_write+0x1a/0x60 [ 34.865564] [] ? SyS_mprotect+0x423/0x640 [ 34.871445] [] do_group_exit+0x111/0x330 [ 34.877134] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 34.883754] [] SyS_exit_group+0x1d/0x20 [ 34.889360] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 34.896115] Code: e5 41 54 53 48 89 fb e8 31 76 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 03 76 e9 ff f0 83 43 18 ff 78 [ 34.923272] RIP [] page_remove_rmap+0x2e/0x260 [ 34.929602] RSP [ 34.933196] CR2: ffffeafff8e60008 [ 34.936629] ---[ end trace d591f146acc5bdff ]--- [ 34.941357] Kernel panic - not syncing: Fatal exception [ 34.946992] Dumping ftrace buffer: [ 34.950506] (ftrace buffer empty) [ 34.954187] Kernel Offset: disabled [ 34.957788] Rebooting in 86400 seconds..