[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.807875] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.440897] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 26.053042] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 26.741738] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) [ 26.914919] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) Warning: Permanently added '10.128.0.29' (ECDSA) to the list of known hosts. [ 32.471913] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) executing program [ 32.562521] BUG: unable to handle kernel paging request at ffffeafff8ca0008 [ 32.569898] IP: [] page_remove_rmap+0x2e/0x260 [ 32.576195] PGD 0 [ 32.578446] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.583404] Dumping ftrace buffer: [ 32.586937] (ftrace buffer empty) [ 32.590632] Modules linked in: [ 32.593967] CPU: 0 PID: 3814 Comm: syz-executor568 Not tainted 4.4.150-g5541782 #83 [ 32.601756] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.611090] task: ffff8801c9be3000 task.stack: ffff8801c9668000 [ 32.617120] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.625804] RSP: 0018:ffff8801c966f9c0 EFLAGS: 00010246 [ 32.631225] RAX: dffffc0000000000 RBX: ffffeafff8ca0000 RCX: 0000000000000000 [ 32.638491] RDX: 1ffffd5fff194001 RSI: ffffffff814bceaf RDI: ffffeafff8ca0008 [ 32.645737] RBP: ffff8801c966f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.653018] R10: 0000000000000001 R11: ffff8801c9be3000 R12: 0000000000000001 [ 32.660266] R13: 1ffff100392cdf3e R14: ffff8801cdbb2800 R15: ffffeafff8ca0000 [ 32.667513] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.675730] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.681587] CR2: ffffeafff8ca0008 CR3: 00000001cbefd000 CR4: 00000000001606f0 [ 32.688833] Stack: [ 32.690957] ffff8801c966fc50 0000000000000001 ffff8801c966fa78 ffffffff8150ad13 [ 32.698968] 00003ffe328001e0 00003ffe328001e0 0000000041b58ab3 ffffffff841ef837 [ 32.706969] ffffffff8150ab10 00000000000004f0 ffff8801ce8ec528 ffff8801c966fa40 [ 32.714998] Call Trace: [ 32.717571] [] zap_huge_pmd+0x203/0x510 [ 32.723171] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.729748] [] unmap_single_vma+0xea3/0x1240 [ 32.735782] [] ? vm_normal_page+0x280/0x280 [ 32.741736] [] ? __put_single_page+0x60/0x60 [ 32.747773] [] unmap_vmas+0x81/0xd0 [ 32.753031] [] exit_mmap+0x1c9/0x3a0 [ 32.758382] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.764853] [] ? up_write+0x1a/0x60 [ 32.770110] [] mmput+0xf8/0x2d0 [ 32.775016] [] do_exit+0x8d8/0x26b0 [ 32.780271] [] ? file_map_prot_check+0x193/0x310 [ 32.786653] [] ? release_task.part.17+0x1200/0x1200 [ 32.793300] [] ? SyS_mprotect+0x41e/0x640 [ 32.799093] [] ? up_write+0x1a/0x60 [ 32.804347] [] ? SyS_mprotect+0x423/0x640 [ 32.810141] [] ? retint_user+0x18/0x3c [ 32.815658] [] do_group_exit+0x111/0x330 [ 32.821344] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 32.827898] [] SyS_exit_group+0x1d/0x20 [ 32.833499] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.840050] Code: e5 41 54 53 48 89 fb e8 31 76 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 03 76 e9 ff f0 83 43 18 ff 78 [ 32.866955] RIP [] page_remove_rmap+0x2e/0x260 [ 32.873297] RSP [ 32.876915] CR2: ffffeafff8ca0008 [ 32.880375] ---[ end trace 7d1e0107da7383aa ]--- [ 32.885111] Kernel panic - not syncing: Fatal exception [ 32.890800] Dumping ftrace buffer: [ 32.894329] (ftrace buffer empty) [ 32.898013] Kernel Offset: disabled [ 32.901642] Rebooting in 86400 seconds..