[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.734428] 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: [ 24.674702] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 24.994410] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.551195] random: sshd: uninitialized urandom read (32 bytes read, 51 bits of entropy available) [ 25.727412] random: sshd: uninitialized urandom read (32 bytes read, 55 bits of entropy available) Warning: Permanently added '10.128.0.31' (ECDSA) to the list of known hosts. [ 31.589075] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) executing program [ 31.676795] BUG: unable to handle kernel paging request at ffffeafff8cf8008 [ 31.684178] IP: [] page_remove_rmap+0x2e/0x260 [ 31.690445] PGD 0 [ 31.692712] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.697721] Dumping ftrace buffer: [ 31.701242] (ftrace buffer empty) [ 31.704952] Modules linked in: [ 31.708271] CPU: 0 PID: 3824 Comm: syz-executor064 Not tainted 4.4.148-gf057ff9 #81 [ 31.716046] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.725516] task: ffff8800ad514800 task.stack: ffff8801c9178000 [ 31.731559] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.740262] RSP: 0018:ffff8801c917f9c0 EFLAGS: 00010246 [ 31.745694] RAX: dffffc0000000000 RBX: ffffeafff8cf8000 RCX: ffffea0002b08000 [ 31.752963] RDX: 1ffffd5fff19f001 RSI: ffffffff814bc75f RDI: ffffeafff8cf8008 [ 31.760349] RBP: ffff8801c917f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.767606] R10: 0000000000000001 R11: ffff8800ad514800 R12: 0000000000000001 [ 31.774863] R13: 1ffff1003922ff3e R14: ffff8801cd8b1800 R15: ffffeafff8cf8000 [ 31.782239] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.790451] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.796320] CR2: ffffeafff8cf8008 CR3: 00000001cc7f0000 CR4: 00000000001606f0 [ 31.803657] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.810936] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.818191] Stack: [ 31.820324] ffff8801c917fc50 0000000000000001 ffff8801c917fa78 ffffffff8150a1f3 [ 31.828570] 00003ffe33e001e0 00003ffe33e001e0 0000000041b58ab3 ffffffff841ef82f [ 31.836612] ffffffff81509ff0 00000000000004f0 ffff8800af9b0f20 ffff8801c917fa40 [ 31.844650] Call Trace: [ 31.847226] [] zap_huge_pmd+0x203/0x510 [ 31.852839] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.859406] [] unmap_single_vma+0xea3/0x1240 [ 31.865608] [] ? vm_normal_page+0x230/0x230 [ 31.871565] [] ? __put_single_page+0x60/0x60 [ 31.877611] [] unmap_vmas+0x81/0xd0 [ 31.882883] [] exit_mmap+0x1c9/0x3a0 [ 31.888242] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.894726] [] ? up_write+0x1a/0x60 [ 31.900064] [] mmput+0xf8/0x2d0 [ 31.904986] [] do_exit+0x8d8/0x26b0 [ 31.910249] [] ? file_map_prot_check+0x193/0x310 [ 31.916639] [] ? release_task.part.17+0x1200/0x1200 [ 31.923384] [] ? SyS_mprotect+0x41e/0x640 [ 31.923393] [] ? up_write+0x1a/0x60 [ 31.923400] [] ? SyS_mprotect+0x423/0x640 [ 31.923407] [] do_group_exit+0x111/0x330 [ 31.923414] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 31.923420] [] SyS_exit_group+0x1d/0x20 [ 31.923431] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 31.923537] 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 [ 31.923546] RIP [] page_remove_rmap+0x2e/0x260 [ 31.923549] RSP [ 31.923552] CR2: ffffeafff8cf8008 [ 31.923558] ---[ end trace 76bfe3d9bdebaf8a ]--- [ 31.923562] Kernel panic - not syncing: Fatal exception [ 31.929975] Dumping ftrace buffer: [ 31.929979] (ftrace buffer empty) [ 31.929981] Kernel Offset: disabled [ 32.018691] Rebooting in 86400 seconds..