[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.748305] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 32.925652] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 33.465990] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 33.942061] random: sshd: uninitialized urandom read (32 bytes read, 55 bits of entropy available) [ 34.100649] random: sshd: uninitialized urandom read (32 bytes read, 58 bits of entropy available) Warning: Permanently added '10.128.0.56' (ECDSA) to the list of known hosts. [ 39.726205] random: sshd: uninitialized urandom read (32 bytes read, 64 bits of entropy available) executing program [ 39.813033] BUG: unable to handle kernel paging request at ffffeafffd538008 [ 39.820551] IP: [] page_remove_rmap+0x2e/0x260 [ 39.826944] PGD 0 [ 39.829220] Oops: 0000 [#1] PREEMPT SMP KASAN [ 39.834652] Dumping ftrace buffer: [ 39.838177] (ftrace buffer empty) [ 39.841892] Modules linked in: [ 39.845226] CPU: 1 PID: 3854 Comm: syz-executor421 Not tainted 4.4.148-gf057ff9 #81 [ 39.853160] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.862627] task: ffff8800ac136000 task.stack: ffff8800bb0a0000 [ 39.868844] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 39.877680] RSP: 0018:ffff8800bb0a79c0 EFLAGS: 00010246 [ 39.883116] RAX: dffffc0000000000 RBX: ffffeafffd538000 RCX: ffffea0002ac0000 [ 39.890533] RDX: 1ffffd5fffaa7001 RSI: ffffffff814bc75f RDI: ffffeafffd538008 [ 39.897904] RBP: ffff8800bb0a79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 39.905340] R10: 0000000000000001 R11: ffff8800ac136000 R12: 0000000000000001 [ 39.912771] R13: 1ffff10017614f3e R14: ffff8800b150f810 R15: ffffeafffd538000 [ 39.920304] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 39.928894] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.934766] CR2: ffffeafffd538008 CR3: 00000000b3c5b000 CR4: 00000000001606f0 [ 39.942028] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.949396] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.956829] Stack: [ 39.958965] ffff8800bb0a7c50 0000000000000001 ffff8800bb0a7a78 ffffffff8150a1f3 [ 39.967038] 00003fff54e001a0 00003fff54e001a0 0000000041b58ab3 ffffffff841ef82f [ 39.975085] ffffffff81509ff0 00000000000004f0 ffff8800af7cc6e0 ffff8800bb0a7a40 [ 39.983233] Call Trace: [ 39.985811] [] zap_huge_pmd+0x203/0x510 [ 39.991425] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 39.998161] [] unmap_single_vma+0xea3/0x1240 [ 40.004423] [] ? vm_normal_page+0x230/0x230 [ 40.010387] [] ? __put_single_page+0x60/0x60 [ 40.016597] [] unmap_vmas+0x81/0xd0 [ 40.021862] [] exit_mmap+0x1c9/0x3a0 [ 40.027234] [] ? SyS_remap_file_pages+0x870/0x870 [ 40.033712] [] ? up_write+0x1a/0x60 [ 40.039062] [] mmput+0xf8/0x2d0 [ 40.044119] [] do_exit+0x8d8/0x26b0 [ 40.049386] [] ? file_map_prot_check+0x193/0x310 [ 40.055893] [] ? release_task.part.17+0x1200/0x1200 [ 40.062554] [] ? SyS_mprotect+0x41e/0x640 [ 40.068337] [] ? up_write+0x1a/0x60 [ 40.073621] [] ? SyS_mprotect+0x423/0x640 [ 40.079417] [] do_group_exit+0x111/0x330 [ 40.085112] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 40.091590] [] SyS_exit_group+0x1d/0x20 [ 40.097627] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 40.104333] 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 [ 40.132421] RIP [] page_remove_rmap+0x2e/0x260 [ 40.139097] RSP [ 40.142707] CR2: ffffeafffd538008 [ 40.146148] ---[ end trace 78716036e3d96cee ]--- [ 40.150906] Kernel panic - not syncing: Fatal exception [ 40.156741] Dumping ftrace buffer: [ 40.160396] (ftrace buffer empty) [ 40.164138] Kernel Offset: disabled [ 40.167754] Rebooting in 86400 seconds..