[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.061682] 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: [ 24.343723] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.687910] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.261271] random: sshd: uninitialized urandom read (32 bytes read, 53 bits of entropy available) [ 25.424213] random: sshd: uninitialized urandom read (32 bytes read, 55 bits of entropy available) Warning: Permanently added '10.128.10.37' (ECDSA) to the list of known hosts. [ 30.921585] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) executing program [ 31.005684] BUG: unable to handle kernel paging request at ffffeafff8d08008 [ 31.013011] IP: [] page_remove_rmap+0x2e/0x260 [ 31.019260] PGD 0 [ 31.021498] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.026434] Dumping ftrace buffer: [ 31.029967] (ftrace buffer empty) [ 31.033651] Modules linked in: [ 31.036947] CPU: 0 PID: 3834 Comm: syz-executor136 Not tainted 4.4.148-gf057ff9 #81 [ 31.044712] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.054056] task: ffff8801c8094800 task.stack: ffff8801d9270000 [ 31.060105] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.068772] RSP: 0018:ffff8801d92779c0 EFLAGS: 00010246 [ 31.074207] RAX: dffffc0000000000 RBX: ffffeafff8d08000 RCX: 0000000000000000 [ 31.081452] RDX: 1ffffd5fff1a1001 RSI: ffffffff814bc75f RDI: ffffeafff8d08008 [ 31.088704] RBP: ffff8801d92779d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.095946] R10: 0000000000000001 R11: ffff8801c8094800 R12: 0000000000000001 [ 31.103194] R13: 1ffff1003b24ef3e R14: ffff8801c7f06800 R15: ffffeafff8d08000 [ 31.110438] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.118641] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.124493] CR2: ffffeafff8d08008 CR3: 00000001da39f000 CR4: 00000000001606f0 [ 31.131737] Stack: [ 31.133858] ffff8801d9277c50 0000000000000001 ffff8801d9277a78 ffffffff8150a1f3 [ 31.141836] 00003ffe342001e0 00003ffe342001e0 0000000041b58ab3 ffffffff841ef82f [ 31.149830] ffffffff81509ff0 00000000000004f0 ffff8801c7eb8bb0 ffff8801d9277a40 [ 31.157846] Call Trace: [ 31.160408] [] zap_huge_pmd+0x203/0x510 [ 31.166014] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.172566] [] unmap_single_vma+0xea3/0x1240 [ 31.178615] [] ? vm_normal_page+0x230/0x230 [ 31.184561] [] ? __put_single_page+0x60/0x60 [ 31.190589] [] unmap_vmas+0x81/0xd0 [ 31.195837] [] exit_mmap+0x1c9/0x3a0 [ 31.201174] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.207638] [] ? up_write+0x1a/0x60 [ 31.212890] [] mmput+0xf8/0x2d0 [ 31.217794] [] do_exit+0x8d8/0x26b0 [ 31.223045] [] ? file_map_prot_check+0x193/0x310 [ 31.229424] [] ? release_task.part.17+0x1200/0x1200 [ 31.236062] [] ? SyS_mprotect+0x41e/0x640 [ 31.241830] [] ? up_write+0x1a/0x60 [ 31.247078] [] ? SyS_mprotect+0x423/0x640 [ 31.252861] [] do_group_exit+0x111/0x330 [ 31.258542] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 31.265005] [] SyS_exit_group+0x1d/0x20 [ 31.270602] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 31.277150] 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 [ 31.296693] RIP [] page_remove_rmap+0x2e/0x260 [ 31.296704] RSP [ 31.296707] CR2: ffffeafff8d08008 [ 31.296713] ---[ end trace 8ef2a6c1e02ffd85 ]--- [ 31.296717] Kernel panic - not syncing: Fatal exception [ 31.297032] Dumping ftrace buffer: [ 31.297036] (ftrace buffer empty) [ 31.297038] Kernel Offset: disabled [ 31.336726] Rebooting in 86400 seconds..