[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.744714] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.430686] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 26.862083] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.477446] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) [ 27.651883] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) Warning: Permanently added '10.128.10.55' (ECDSA) to the list of known hosts. [ 33.113004] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) executing program [ 33.199325] BUG: unable to handle kernel paging request at ffffeafff8da8008 [ 33.206746] IP: [] page_remove_rmap+0x2e/0x260 [ 33.213006] PGD 0 [ 33.215243] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.220174] Dumping ftrace buffer: [ 33.223683] (ftrace buffer empty) [ 33.227376] Modules linked in: [ 33.230656] CPU: 0 PID: 3850 Comm: syz-executor089 Not tainted 4.4.148-gf057ff9 #81 [ 33.238421] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.247747] task: ffff8801d9119800 task.stack: ffff8801d9228000 [ 33.253776] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.262460] RSP: 0018:ffff8801d922f9c0 EFLAGS: 00010246 [ 33.267885] RAX: dffffc0000000000 RBX: ffffeafff8da8000 RCX: 0000000000000000 [ 33.275126] RDX: 1ffffd5fff1b5001 RSI: ffffffff814bc75f RDI: ffffeafff8da8008 [ 33.282373] RBP: ffff8801d922f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.289770] R10: 0000000000000001 R11: ffff8801d9119800 R12: 0000000000000001 [ 33.297026] R13: 1ffff1003b245f3e R14: ffff8801d0b82800 R15: ffffeafff8da8000 [ 33.304278] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.312480] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.318437] CR2: ffffeafff8da8008 CR3: 00000001cbf33000 CR4: 00000000001606f0 [ 33.325681] Stack: [ 33.327810] ffff8801d922fc50 0000000000000001 ffff8801d922fa78 ffffffff8150a1f3 [ 33.335803] 00003ffe36a001e0 00003ffe36a001e0 0000000041b58ab3 ffffffff841ef82f [ 33.343884] ffffffff81509ff0 00000000000004f0 ffff8801c7c0f898 ffff8801d922fa40 [ 33.351894] Call Trace: [ 33.354459] [] zap_huge_pmd+0x203/0x510 [ 33.360058] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.366628] [] unmap_single_vma+0xea3/0x1240 [ 33.372671] [] ? vm_normal_page+0x230/0x230 [ 33.378619] [] ? __put_single_page+0x60/0x60 [ 33.384651] [] unmap_vmas+0x81/0xd0 [ 33.389904] [] exit_mmap+0x1c9/0x3a0 [ 33.395242] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.401708] [] ? kmem_cache_free+0x2b4/0x340 [ 33.407743] [] mmput+0xf8/0x2d0 [ 33.412646] [] do_exit+0x8d8/0x26b0 [ 33.417897] [] ? file_map_prot_check+0x193/0x310 [ 33.424289] [] ? release_task.part.17+0x1200/0x1200 [ 33.431121] [] ? SyS_mprotect+0x41e/0x640 [ 33.436911] [] ? up_write+0x1a/0x60 [ 33.442165] [] ? SyS_mprotect+0x423/0x640 [ 33.447936] [] do_group_exit+0x111/0x330 [ 33.453621] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.460089] [] SyS_exit_group+0x1d/0x20 [ 33.465689] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.472247] 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 [ 33.499058] RIP [] page_remove_rmap+0x2e/0x260 [ 33.505445] RSP [ 33.509043] CR2: ffffeafff8da8008 [ 33.512469] ---[ end trace cad66b4fbb07aed3 ]--- [ 33.517194] Kernel panic - not syncing: Fatal exception [ 33.522866] Dumping ftrace buffer: [ 33.526385] (ftrace buffer empty) [ 33.530067] Kernel Offset: disabled [ 33.533667] Rebooting in 86400 seconds..