[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.692537] 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: [ 25.207042] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 25.632202] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.239393] random: sshd: uninitialized urandom read (32 bytes read, 56 bits of entropy available) [ 33.701148] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) Warning: Permanently added '10.128.0.11' (ECDSA) to the list of known hosts. [ 39.333207] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) executing program [ 39.422942] BUG: unable to handle kernel paging request at ffffeafffd3b0008 [ 39.430315] IP: [] page_remove_rmap+0x2e/0x260 [ 39.436558] PGD 0 [ 39.438798] Oops: 0000 [#1] PREEMPT SMP KASAN [ 39.443741] Dumping ftrace buffer: [ 39.447254] (ftrace buffer empty) [ 39.450936] Modules linked in: [ 39.454221] CPU: 1 PID: 3696 Comm: syz-executor532 Not tainted 4.4.149-gf76bdbd #18 [ 39.461985] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.471318] task: ffff8801cedf9800 task.stack: ffff8800b2400000 [ 39.477455] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 39.486195] RSP: 0018:ffff8800b2407948 EFLAGS: 00010246 [ 39.491620] RAX: dffffc0000000000 RBX: ffffeafffd3b0000 RCX: 0000000000000000 [ 39.498864] RDX: 1ffffd5fffa76001 RSI: ffffffff814bc8bf RDI: ffffeafffd3b0008 [ 39.506112] RBP: ffff8800b2407958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 39.513357] R10: 0000000000000001 R11: ffff8801cedf9800 R12: 0000000000000001 [ 39.520603] R13: 1ffff10016480f2f R14: ffff8800b6cee800 R15: ffffeafffd3b0000 [ 39.527908] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 39.536176] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 39.542040] CR2: ffffeafffd3b0008 CR3: 00000000b2ce0000 CR4: 00000000001606f0 [ 39.549289] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.556589] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.563942] Stack: [ 39.566064] ffff8800b2407bd8 0000000000000001 ffff8800b2407a00 ffffffff8150a443 [ 39.574178] 00003fff4ec001e0 00003fff4ec001e0 0000000041b58ab3 ffffffff841ef837 [ 39.582196] ffffffff8150a240 00000000000004f0 ffff8800b24a8840 ffff8800b24079c8 [ 39.590171] Call Trace: [ 39.592739] [] zap_huge_pmd+0x203/0x510 [ 39.598338] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 39.604897] [] unmap_single_vma+0xea3/0x1240 [ 39.610938] [] ? vm_normal_page+0x230/0x230 [ 39.617026] [] ? __put_single_page+0x60/0x60 [ 39.623063] [] unmap_vmas+0x81/0xd0 [ 39.628312] [] exit_mmap+0x1c9/0x3a0 [ 39.633650] [] ? SyS_remap_file_pages+0x870/0x870 [ 39.640216] [] ? up_write+0x1a/0x60 [ 39.645474] [] mmput+0xf8/0x2d0 [ 39.650383] [] do_exit+0x8d8/0x26b0 [ 39.655637] [] ? handle_mm_fault+0x1a49/0x31e0 [ 39.661969] [] ? release_task.part.17+0x1200/0x1200 [ 39.668610] [] do_group_exit+0x111/0x330 [ 39.674295] [] ? do_group_exit+0x330/0x330 [ 39.680156] [] SyS_exit_group+0x1d/0x20 [ 39.685800] [] do_fast_syscall_32+0x324/0x8b0 [ 39.691939] [] sysenter_flags_fixed+0xd/0x1a [ 39.698070] 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 [ 39.725305] RIP [] page_remove_rmap+0x2e/0x260 [ 39.731631] RSP [ 39.735226] CR2: ffffeafffd3b0008 [ 39.738655] ---[ end trace 8aa0179e5f89f052 ]--- [ 39.743416] Kernel panic - not syncing: Fatal exception [ 39.749171] Dumping ftrace buffer: [ 39.752699] (ftrace buffer empty) [ 39.756386] Kernel Offset: disabled [ 39.759986] Rebooting in 86400 seconds..