[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.150206] 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: [ 22.582656] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 22.905697] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 23.689625] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) [ 23.863528] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) Warning: Permanently added '10.128.10.22' (ECDSA) to the list of known hosts. [ 29.417466] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) executing program [ 29.514148] BUG: unable to handle kernel paging request at ffffeafff8d70008 [ 29.521731] IP: [] page_remove_rmap+0x2e/0x260 [ 29.528008] PGD 0 [ 29.530330] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.535349] Dumping ftrace buffer: [ 29.538870] (ftrace buffer empty) [ 29.542564] Modules linked in: [ 29.545867] CPU: 0 PID: 3839 Comm: syz-executor296 Not tainted 4.4.148-gf057ff9 #81 [ 29.553644] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.563000] task: ffff8800ac953000 task.stack: ffff8801d8dd8000 [ 29.569153] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 29.577854] RSP: 0018:ffff8801d8ddf9c0 EFLAGS: 00010246 [ 29.583330] RAX: dffffc0000000000 RBX: ffffeafff8d70000 RCX: 0000000000000000 [ 29.590584] RDX: 1ffffd5fff1ae001 RSI: ffffffff814bc75f RDI: ffffeafff8d70008 [ 29.597838] RBP: ffff8801d8ddf9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 29.605202] R10: 0000000000000001 R11: ffff8800ac953000 R12: 0000000000000001 [ 29.612521] R13: 1ffff1003b1bbf3e R14: ffff8801cecd9800 R15: ffffeafff8d70000 [ 29.619777] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.628004] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.633870] CR2: ffffeafff8d70008 CR3: 00000001cdebf000 CR4: 00000000001606f0 [ 29.641128] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.648384] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.655636] Stack: [ 29.657770] ffff8801d8ddfc50 0000000000000001 ffff8801d8ddfa78 ffffffff8150a1f3 [ 29.665829] 00003ffe35c001e0 00003ffe35c001e0 0000000041b58ab3 ffffffff841ef82f [ 29.673942] ffffffff81509ff0 00000000000004f0 ffff8801cff821b8 ffff8801d8ddfa40 [ 29.681997] Call Trace: [ 29.684572] [] zap_huge_pmd+0x203/0x510 [ 29.690231] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 29.696798] [] unmap_single_vma+0xea3/0x1240 [ 29.702843] [] ? vm_normal_page+0x230/0x230 [ 29.708800] [] ? __put_single_page+0x60/0x60 [ 29.714842] [] unmap_vmas+0x81/0xd0 [ 29.720104] [] exit_mmap+0x1c9/0x3a0 [ 29.725453] [] ? SyS_remap_file_pages+0x870/0x870 [ 29.731933] [] ? up_write+0x1a/0x60 [ 29.737196] [] mmput+0xf8/0x2d0 [ 29.742112] [] do_exit+0x8d8/0x26b0 [ 29.747374] [] ? file_map_prot_check+0x193/0x310 [ 29.753764] [] ? release_task.part.17+0x1200/0x1200 [ 29.760416] [] ? SyS_mprotect+0x41e/0x640 [ 29.766199] [] ? up_write+0x1a/0x60 [ 29.771461] [] ? SyS_mprotect+0x423/0x640 [ 29.777246] [] do_group_exit+0x111/0x330 [ 29.782949] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 29.789444] [] SyS_exit_group+0x1d/0x20 [ 29.795107] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 29.801711] 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 [ 29.829364] RIP [] page_remove_rmap+0x2e/0x260 [ 29.835717] RSP [ 29.839367] CR2: ffffeafff8d70008 [ 29.842808] ---[ end trace e79a6f0aa8a9b519 ]--- [ 29.847544] Kernel panic - not syncing: Fatal exception [ 29.853373] Dumping ftrace buffer: [ 29.856908] (ftrace buffer empty) [ 29.860599] Kernel Offset: disabled [ 29.864208] Rebooting in 86400 seconds..