[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.839019] 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: [ 23.244693] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 23.470561] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 24.155799] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) [ 34.992028] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) Warning: Permanently added '10.128.10.36' (ECDSA) to the list of known hosts. [ 40.673890] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available) executing program [ 40.757518] BUG: unable to handle kernel paging request at ffffeafff8cb0008 [ 40.764870] IP: [] page_remove_rmap+0x2e/0x260 [ 40.771112] PGD 0 [ 40.773348] Oops: 0000 [#1] PREEMPT SMP KASAN [ 40.778280] Dumping ftrace buffer: [ 40.781793] (ftrace buffer empty) [ 40.785514] Modules linked in: [ 40.788800] CPU: 1 PID: 3718 Comm: syz-executor899 Not tainted 4.4.149-gf76bdbd #82 [ 40.796565] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.805901] task: ffff8800b1d31800 task.stack: ffff8801cdd70000 [ 40.811930] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 40.820790] RSP: 0018:ffff8801cdd779c0 EFLAGS: 00010246 [ 40.826216] RAX: dffffc0000000000 RBX: ffffeafff8cb0000 RCX: 0000000000000000 [ 40.833460] RDX: 1ffffd5fff196001 RSI: ffffffff814bc8bf RDI: ffffeafff8cb0008 [ 40.840703] RBP: ffff8801cdd779d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 40.847953] R10: 0000000000000001 R11: ffff8800b1d31800 R12: 0000000000000001 [ 40.855207] R13: 1ffff10039baef3e R14: ffff8801d227d800 R15: ffffeafff8cb0000 [ 40.862458] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 40.870656] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.876522] CR2: ffffeafff8cb0008 CR3: 00000001d06fd000 CR4: 00000000001606f0 [ 40.883773] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 40.891024] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 40.898266] Stack: [ 40.900390] ffff8801cdd77c50 0000000000000001 ffff8801cdd77a78 ffffffff8150a443 [ 40.908368] 00003ffe32c001e0 00003ffe32c001e0 0000000041b58ab3 ffffffff841ef837 [ 40.916342] ffffffff8150a240 00000000000004f0 ffff8801ce5dcbb0 ffff8801cdd77a40 [ 40.924311] Call Trace: [ 40.926874] [] zap_huge_pmd+0x203/0x510 [ 40.932469] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 40.939023] [] unmap_single_vma+0xea3/0x1240 [ 40.945058] [] ? vm_normal_page+0x230/0x230 [ 40.951011] [] ? __put_single_page+0x60/0x60 [ 40.957111] [] unmap_vmas+0x81/0xd0 [ 40.962368] [] exit_mmap+0x1c9/0x3a0 [ 40.967707] [] ? SyS_remap_file_pages+0x870/0x870 [ 40.974172] [] ? up_write+0x1a/0x60 [ 40.979427] [] mmput+0xf8/0x2d0 [ 40.984333] [] do_exit+0x8d8/0x26b0 [ 40.989590] [] ? file_map_prot_check+0x193/0x310 [ 40.995977] [] ? release_task.part.17+0x1200/0x1200 [ 41.002625] [] ? SyS_mprotect+0x41e/0x640 [ 41.008402] [] ? up_write+0x1a/0x60 [ 41.013658] [] ? SyS_mprotect+0x423/0x640 [ 41.019445] [] do_group_exit+0x111/0x330 [ 41.025133] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 41.031596] [] SyS_exit_group+0x1d/0x20 [ 41.037194] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 41.043742] 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 [ 41.070554] RIP [] page_remove_rmap+0x2e/0x260 [ 41.076885] RSP [ 41.080485] CR2: ffffeafff8cb0008 [ 41.083915] ---[ end trace 3e7e5b4e1d9522e7 ]--- [ 41.088650] Kernel panic - not syncing: Fatal exception [ 41.094392] Dumping ftrace buffer: [ 41.097919] (ftrace buffer empty) [ 41.101607] Kernel Offset: disabled [ 41.105207] Rebooting in 86400 seconds..