[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.557100] 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: [ 25.567149] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.900187] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.637246] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) [ 26.820516] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) Warning: Permanently added '10.128.0.16' (ECDSA) to the list of known hosts. [ 32.427431] random: sshd: uninitialized urandom read (32 bytes read, 84 bits of entropy available) executing program [ 32.518345] BUG: unable to handle kernel paging request at ffffeafffd3c8008 [ 32.525753] IP: [] page_remove_rmap+0x2e/0x260 [ 32.532002] PGD 0 [ 32.534255] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.539200] Dumping ftrace buffer: [ 32.542712] (ftrace buffer empty) [ 32.546396] Modules linked in: [ 32.549684] CPU: 0 PID: 3701 Comm: syz-executor476 Not tainted 4.4.150-g5541782 #83 [ 32.557509] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.566836] task: ffff8801ce8f0000 task.stack: ffff8800b1c90000 [ 32.572927] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.581608] RSP: 0018:ffff8800b1c979c0 EFLAGS: 00010246 [ 32.587030] RAX: dffffc0000000000 RBX: ffffeafffd3c8000 RCX: 0000000000000000 [ 32.594272] RDX: 1ffffd5fffa79001 RSI: ffffffff814bceaf RDI: ffffeafffd3c8008 [ 32.601513] RBP: ffff8800b1c979d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.608758] R10: 0000000000000001 R11: ffff8801ce8f0000 R12: 0000000000000001 [ 32.616005] R13: 1ffff10016392f3e R14: ffff8800b21a2800 R15: ffffeafffd3c8000 [ 32.623424] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.631621] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.637477] CR2: ffffeafffd3c8008 CR3: 00000000b1c57000 CR4: 00000000001606f0 [ 32.644722] Stack: [ 32.646870] ffff8800b1c97c50 0000000000000001 ffff8800b1c97a78 ffffffff8150ad13 [ 32.654873] 00003fff4f2001e0 00003fff4f2001e0 0000000041b58ab3 ffffffff841ef837 [ 32.662849] ffffffff8150ab10 00000000000004f0 ffff8800b6d4bd68 ffff8800b1c97a40 [ 32.670845] Call Trace: [ 32.673410] [] zap_huge_pmd+0x203/0x510 [ 32.679007] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.685562] [] unmap_single_vma+0xea3/0x1240 [ 32.691597] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 32.698414] [] ? vm_normal_page+0x280/0x280 [ 32.704365] [] unmap_vmas+0x81/0xd0 [ 32.709617] [] exit_mmap+0x1c9/0x3a0 [ 32.714953] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.721417] [] ? kmem_cache_free+0x2b4/0x340 [ 32.727450] [] mmput+0xf8/0x2d0 [ 32.732359] [] do_exit+0x8d8/0x26b0 [ 32.737618] [] ? release_task.part.17+0x1200/0x1200 [ 32.744257] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 32.750812] [] ? retint_kernel+0x2d/0x2d [ 32.756498] [] do_group_exit+0x111/0x330 [ 32.762187] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 32.768738] [] SyS_exit_group+0x1d/0x20 [ 32.774337] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.780886] 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 [ 32.807710] RIP [] page_remove_rmap+0x2e/0x260 [ 32.814075] RSP [ 32.817688] CR2: ffffeafffd3c8008 [ 32.821125] ---[ end trace a2f56271adc7ff80 ]--- [ 32.825853] Kernel panic - not syncing: Fatal exception [ 32.831480] Dumping ftrace buffer: [ 32.834998] (ftrace buffer empty) [ 32.838723] Kernel Offset: disabled [ 32.842328] Rebooting in 86400 seconds..