[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 23.284742] 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: [ 28.692141] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 29.384938] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 30.045560] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) [ 30.221846] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) Warning: Permanently added '10.128.10.26' (ECDSA) to the list of known hosts. [ 36.064365] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) executing program [ 36.152927] BUG: unable to handle kernel paging request at ffffeafff8d98008 [ 36.160265] IP: [] page_remove_rmap+0x2e/0x260 [ 36.166517] PGD 0 [ 36.168747] Oops: 0000 [#1] PREEMPT SMP KASAN [ 36.173699] Dumping ftrace buffer: [ 36.177204] (ftrace buffer empty) [ 36.180879] Modules linked in: [ 36.184155] CPU: 1 PID: 3860 Comm: syz-executor290 Not tainted 4.4.148-gf057ff9 #81 [ 36.191914] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.201239] task: ffff8800ac363000 task.stack: ffff8801d97e0000 [ 36.207262] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 36.215929] RSP: 0018:ffff8801d97e79c0 EFLAGS: 00010246 [ 36.221342] RAX: dffffc0000000000 RBX: ffffeafff8d98000 RCX: 0000000000000000 [ 36.228601] RDX: 1ffffd5fff1b3001 RSI: ffffffff814bc75f RDI: ffffeafff8d98008 [ 36.235838] RBP: ffff8801d97e79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 36.243077] R10: 0000000000000001 R11: ffff8800ac363000 R12: 0000000000000001 [ 36.250316] R13: 1ffff1003b2fcf3e R14: ffff8801ca61d800 R15: ffffeafff8d98000 [ 36.257555] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 36.265747] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.271604] CR2: ffffeafff8d98008 CR3: 00000001cb9d0000 CR4: 00000000001606f0 [ 36.278863] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.286102] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.293340] Stack: [ 36.295460] ffff8801d97e7c50 0000000000000001 ffff8801d97e7a78 ffffffff8150a1f3 [ 36.303437] 00003ffe366001e0 00003ffe366001e0 0000000041b58ab3 ffffffff841ef82f [ 36.311401] ffffffff81509ff0 00000000000004f0 ffff8801c653d210 ffff8801d97e7a40 [ 36.319386] Call Trace: [ 36.321958] [] zap_huge_pmd+0x203/0x510 [ 36.327554] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 36.334120] [] unmap_single_vma+0xea3/0x1240 [ 36.340147] [] ? vm_normal_page+0x230/0x230 [ 36.346088] [] ? __put_single_page+0x60/0x60 [ 36.352114] [] unmap_vmas+0x81/0xd0 [ 36.357360] [] exit_mmap+0x1c9/0x3a0 [ 36.362717] [] ? SyS_remap_file_pages+0x870/0x870 [ 36.369183] [] ? up_write+0x1a/0x60 [ 36.374433] [] mmput+0xf8/0x2d0 [ 36.379336] [] do_exit+0x8d8/0x26b0 [ 36.384588] [] ? file_map_prot_check+0x193/0x310 [ 36.390963] [] ? release_task.part.17+0x1200/0x1200 [ 36.397597] [] ? SyS_mprotect+0x41e/0x640 [ 36.403366] [] ? up_write+0x1a/0x60 [ 36.408619] [] ? SyS_mprotect+0x423/0x640 [ 36.414407] [] do_group_exit+0x111/0x330 [ 36.420103] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 36.426564] [] SyS_exit_group+0x1d/0x20 [ 36.432176] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 36.438718] 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 [ 36.465591] RIP [] page_remove_rmap+0x2e/0x260 [ 36.471916] RSP [ 36.475510] CR2: ffffeafff8d98008 [ 36.478935] ---[ end trace 244784b93acc9f06 ]--- [ 36.483689] Kernel panic - not syncing: Fatal exception [ 36.489379] Dumping ftrace buffer: [ 36.492897] (ftrace buffer empty) [ 36.496578] Kernel Offset: disabled [ 36.500177] Rebooting in 86400 seconds..