[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.126865] 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: [ 27.000806] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 27.531125] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 28.083213] random: sshd: uninitialized urandom read (32 bytes read, 51 bits of entropy available) [ 28.258481] random: sshd: uninitialized urandom read (32 bytes read, 53 bits of entropy available) Warning: Permanently added '10.128.10.5' (ECDSA) to the list of known hosts. [ 33.860788] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) executing program [ 33.957347] BUG: unable to handle kernel paging request at ffffeafffd230008 [ 33.964719] IP: [] page_remove_rmap+0x2e/0x260 [ 33.970969] PGD 0 [ 33.973286] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.978297] Dumping ftrace buffer: [ 33.981814] (ftrace buffer empty) [ 33.985672] Modules linked in: [ 33.988973] CPU: 0 PID: 3796 Comm: syz-executor202 Not tainted 4.4.148-gf057ff9 #81 [ 33.996735] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.006062] task: ffff8801ca244800 task.stack: ffff8800bb9e8000 [ 34.012095] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 34.020944] RSP: 0018:ffff8800bb9ef9c0 EFLAGS: 00010246 [ 34.026393] RAX: dffffc0000000000 RBX: ffffeafffd230000 RCX: ffffea0002dc8000 [ 34.033713] RDX: 1ffffd5fffa46001 RSI: ffffffff814bc75f RDI: ffffeafffd230008 [ 34.041052] RBP: ffff8800bb9ef9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 34.048359] R10: 0000000000000001 R11: ffff8801ca244800 R12: 0000000000000001 [ 34.055618] R13: 1ffff1001773df3e R14: ffff8800b10e4810 R15: ffffeafffd230000 [ 34.062896] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 34.071098] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.076957] CR2: ffffeafffd230008 CR3: 00000000af0e9000 CR4: 00000000001606f0 [ 34.084215] Stack: [ 34.086369] ffff8800bb9efc50 0000000000000001 ffff8800bb9efa78 ffffffff8150a1f3 [ 34.094371] 00003fff48c001a0 00003fff48c001a0 0000000041b58ab3 ffffffff841ef82f [ 34.102529] ffffffff81509ff0 00000000000004f0 ffff8801d02e6ec8 ffff8800bb9efa40 [ 34.110538] Call Trace: [ 34.113112] [] zap_huge_pmd+0x203/0x510 [ 34.118715] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 34.125275] [] unmap_single_vma+0xea3/0x1240 [ 34.131319] [] ? vm_normal_page+0x230/0x230 [ 34.137271] [] ? __put_single_page+0x60/0x60 [ 34.143303] [] unmap_vmas+0x81/0xd0 [ 34.148561] [] exit_mmap+0x1c9/0x3a0 [ 34.153907] [] ? SyS_remap_file_pages+0x870/0x870 [ 34.160380] [] ? up_write+0x1a/0x60 [ 34.165638] [] mmput+0xf8/0x2d0 [ 34.170546] [] do_exit+0x8d8/0x26b0 [ 34.175918] [] ? file_map_prot_check+0x193/0x310 [ 34.182401] [] ? release_task.part.17+0x1200/0x1200 [ 34.189161] [] ? SyS_mprotect+0x41e/0x640 [ 34.194944] [] ? up_write+0x1a/0x60 [ 34.200204] [] ? SyS_mprotect+0x423/0x640 [ 34.205982] [] do_group_exit+0x111/0x330 [ 34.211700] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 34.218170] [] SyS_exit_group+0x1d/0x20 [ 34.223771] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 34.230322] 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 [ 34.257521] RIP [] page_remove_rmap+0x2e/0x260 [ 34.263850] RSP [ 34.267480] CR2: ffffeafffd230008 [ 34.270920] ---[ end trace 5e27c827f3c7a946 ]--- [ 34.275652] Kernel panic - not syncing: Fatal exception [ 34.281253] Dumping ftrace buffer: [ 34.284807] (ftrace buffer empty) [ 34.288495] Kernel Offset: disabled [ 34.292095] Rebooting in 86400 seconds..