[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.026413] random: sshd: uninitialized urandom read (32 bytes read, 30 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.414681] random: sshd: uninitialized urandom read (32 bytes read, 30 bits of entropy available) [ 20.656534] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.375862] random: sshd: uninitialized urandom read (32 bytes read, 61 bits of entropy available) [ 27.868757] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) Warning: Permanently added '10.128.10.9' (ECDSA) to the list of known hosts. [ 33.479501] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) executing program [ 33.569697] BUG: unable to handle kernel paging request at ffffeafffd408008 [ 33.577075] IP: [] page_remove_rmap+0x2e/0x260 [ 33.583342] PGD 0 [ 33.585601] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.590591] Dumping ftrace buffer: [ 33.594119] (ftrace buffer empty) [ 33.597814] Modules linked in: [ 33.601162] CPU: 0 PID: 3731 Comm: syz-executor522 Not tainted 4.4.148-gf057ff9 #81 [ 33.608937] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.618373] task: ffff8801ccff0000 task.stack: ffff8800b1728000 [ 33.624416] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.633109] RSP: 0018:ffff8800b172f9c0 EFLAGS: 00010246 [ 33.638538] RAX: dffffc0000000000 RBX: ffffeafffd408000 RCX: 0000000000000000 [ 33.645791] RDX: 1ffffd5fffa81001 RSI: ffffffff814bc75f RDI: ffffeafffd408008 [ 33.653042] RBP: ffff8800b172f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.660295] R10: 0000000000000001 R11: ffff8801ccff0000 R12: 0000000000000001 [ 33.667547] R13: 1ffff100162e5f3e R14: ffff8800b115a800 R15: ffffeafffd408000 [ 33.674966] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.683175] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.689039] CR2: ffffeafffd408008 CR3: 00000000b1158000 CR4: 00000000001606f0 [ 33.696292] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.703543] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.710791] Stack: [ 33.712922] ffff8800b172fc50 0000000000000001 ffff8800b172fa78 ffffffff8150a1f3 [ 33.720965] 00003fff502001e0 00003fff502001e0 0000000041b58ab3 ffffffff841ef82f [ 33.729001] ffffffff81509ff0 00000000000004f0 ffff8801cc9f4840 ffff8800b172fa40 [ 33.737164] Call Trace: [ 33.739738] [] zap_huge_pmd+0x203/0x510 [ 33.745345] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.751907] [] unmap_single_vma+0xea3/0x1240 [ 33.757948] [] ? vm_normal_page+0x230/0x230 [ 33.763906] [] ? __put_single_page+0x60/0x60 [ 33.769947] [] unmap_vmas+0x81/0xd0 [ 33.775207] [] exit_mmap+0x1c9/0x3a0 [ 33.780649] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.787236] [] ? up_write+0x1a/0x60 [ 33.792511] [] mmput+0xf8/0x2d0 [ 33.797423] [] do_exit+0x8d8/0x26b0 [ 33.802685] [] ? file_map_prot_check+0x193/0x310 [ 33.809147] [] ? release_task.part.17+0x1200/0x1200 [ 33.815809] [] ? SyS_mprotect+0x41e/0x640 [ 33.821611] [] ? up_write+0x1a/0x60 [ 33.826874] [] ? SyS_mprotect+0x423/0x640 [ 33.832654] [] do_group_exit+0x111/0x330 [ 33.838350] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.844842] [] SyS_exit_group+0x1d/0x20 [ 33.850453] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.857013] 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 [ 33.884466] RIP [] page_remove_rmap+0x2e/0x260 [ 33.890809] RSP [ 33.894434] CR2: ffffeafffd408008 [ 33.897882] ---[ end trace 7bd36f08ec8abc94 ]--- [ 33.902617] Kernel panic - not syncing: Fatal exception [ 33.908579] Dumping ftrace buffer: [ 33.912111] (ftrace buffer empty) [ 33.915803] Kernel Offset: disabled [ 33.919429] Rebooting in 86400 seconds..