[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.088964] 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: [ 27.162505] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.470600] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 28.077074] random: sshd: uninitialized urandom read (32 bytes read, 63 bits of entropy available) [ 28.252846] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) Warning: Permanently added '10.128.10.1' (ECDSA) to the list of known hosts. [ 33.869916] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) executing program [ 33.962514] BUG: unable to handle kernel paging request at ffffeafffd478008 [ 33.969914] IP: [] page_remove_rmap+0x2e/0x260 [ 33.976211] PGD 0 [ 33.978450] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.983440] Dumping ftrace buffer: [ 33.986955] (ftrace buffer empty) [ 33.990657] Modules linked in: [ 33.993948] CPU: 0 PID: 3855 Comm: syz-executor908 Not tainted 4.4.148-gf057ff9 #81 [ 34.001718] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.011062] task: ffff8801d95bc800 task.stack: ffff8800aba88000 [ 34.017093] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 34.025786] RSP: 0018:ffff8800aba8f9c0 EFLAGS: 00010246 [ 34.031209] RAX: dffffc0000000000 RBX: ffffeafffd478000 RCX: 0000000000000000 [ 34.038479] RDX: 1ffffd5fffa8f001 RSI: ffffffff814bc75f RDI: ffffeafffd478008 [ 34.045733] RBP: ffff8800aba8f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 34.052986] R10: 0000000000000001 R11: ffff8801d95bc800 R12: 0000000000000001 [ 34.060237] R13: 1ffff10015751f3e R14: ffff8800b4d3a800 R15: ffffeafffd478000 [ 34.067498] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 34.075716] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.081577] CR2: ffffeafffd478008 CR3: 00000000b627e000 CR4: 00000000001606f0 [ 34.088823] Stack: [ 34.090951] ffff8800aba8fc50 0000000000000001 ffff8800aba8fa78 ffffffff8150a1f3 [ 34.098974] 00003fff51e001e0 00003fff51e001e0 0000000041b58ab3 ffffffff841ef82f [ 34.106978] ffffffff81509ff0 00000000000004f0 ffff8800b0c04a50 ffff8800aba8fa40 [ 34.115016] Call Trace: [ 34.117590] [] zap_huge_pmd+0x203/0x510 [ 34.123217] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 34.129786] [] unmap_single_vma+0xea3/0x1240 [ 34.135829] [] ? vm_normal_page+0x230/0x230 [ 34.141817] [] ? __put_single_page+0x60/0x60 [ 34.147857] [] unmap_vmas+0x81/0xd0 [ 34.153116] [] exit_mmap+0x1c9/0x3a0 [ 34.158454] [] ? SyS_remap_file_pages+0x870/0x870 [ 34.164923] [] ? up_write+0x1a/0x60 [ 34.170177] [] mmput+0xf8/0x2d0 [ 34.175091] [] do_exit+0x8d8/0x26b0 [ 34.180370] [] ? file_map_prot_check+0x193/0x310 [ 34.186752] [] ? release_task.part.17+0x1200/0x1200 [ 34.193420] [] ? SyS_mprotect+0x41e/0x640 [ 34.199197] [] ? up_write+0x1a/0x60 [ 34.204452] [] ? SyS_mprotect+0x423/0x640 [ 34.210565] [] do_group_exit+0x111/0x330 [ 34.216257] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 34.222819] [] SyS_exit_group+0x1d/0x20 [ 34.228424] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 34.234979] 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 [ 34.262180] RIP [] page_remove_rmap+0x2e/0x260 [ 34.268552] RSP [ 34.272163] CR2: ffffeafffd478008 [ 34.275592] ---[ end trace e6d5be4105497ef1 ]--- [ 34.280324] Kernel panic - not syncing: Fatal exception [ 34.285988] Dumping ftrace buffer: [ 34.289520] (ftrace buffer empty) [ 34.293216] Kernel Offset: disabled [ 34.296821] Rebooting in 86400 seconds..