[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 23.788495] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.127834] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 28.575912] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 29.169026] random: sshd: uninitialized urandom read (32 bytes read, 56 bits of entropy available) [ 29.349663] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) Warning: Permanently added '10.128.0.51' (ECDSA) to the list of known hosts. [ 34.914249] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) executing program [ 35.008653] BUG: unable to handle kernel paging request at ffffeafffd3c8008 [ 35.016056] IP: [] page_remove_rmap+0x2e/0x260 [ 35.022521] PGD 0 [ 35.024795] Oops: 0000 [#1] PREEMPT SMP KASAN [ 35.030007] Dumping ftrace buffer: [ 35.033686] (ftrace buffer empty) [ 35.037406] Modules linked in: [ 35.040721] CPU: 0 PID: 3844 Comm: syz-executor033 Not tainted 4.4.148-gf057ff9 #81 [ 35.048504] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.057944] task: ffff8800ac188000 task.stack: ffff8800ac158000 [ 35.063994] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 35.072859] RSP: 0018:ffff8800ac15f9c0 EFLAGS: 00010246 [ 35.078296] RAX: dffffc0000000000 RBX: ffffeafffd3c8000 RCX: 0000000000000000 [ 35.085563] RDX: 1ffffd5fffa79001 RSI: ffffffff814bc75f RDI: ffffeafffd3c8008 [ 35.092825] RBP: ffff8800ac15f9d0 R08: ffffffff85345c40 R09: 0000000000000000 [ 35.100620] R10: 0000000000000001 R11: ffff8800ac188000 R12: 0000000000000001 [ 35.107880] R13: 1ffff1001582bf3e R14: ffff8800add0c800 R15: ffffeafffd3c8000 [ 35.115317] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 35.123671] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.129690] CR2: ffffeafffd3c8008 CR3: 00000000b5afe000 CR4: 00000000001606f0 [ 35.137106] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.144550] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.152259] Stack: [ 35.154402] ffff8800ac15fc50 0000000000000001 ffff8800ac15fa78 ffffffff8150a1f3 [ 35.162549] 00003fff4f2001e0 00003fff4f2001e0 0000000041b58ab3 ffffffff841ef82f [ 35.170592] ffffffff81509ff0 00000000000004f0 ffff8800b154b738 ffff8800ac15fa40 [ 35.178665] Call Trace: [ 35.181243] [] zap_huge_pmd+0x203/0x510 [ 35.186860] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 35.193559] [] unmap_single_vma+0xea3/0x1240 [ 35.199616] [] ? vm_normal_page+0x230/0x230 [ 35.205711] [] ? __put_single_page+0x60/0x60 [ 35.211760] [] unmap_vmas+0x81/0xd0 [ 35.217026] [] exit_mmap+0x1c9/0x3a0 [ 35.222398] [] ? SyS_remap_file_pages+0x870/0x870 [ 35.228884] [] ? up_write+0x1a/0x60 [ 35.234148] [] mmput+0xf8/0x2d0 [ 35.239068] [] do_exit+0x8d8/0x26b0 [ 35.244336] [] ? file_map_prot_check+0x193/0x310 [ 35.250758] [] ? release_task.part.17+0x1200/0x1200 [ 35.257584] [] ? SyS_mprotect+0x41e/0x640 [ 35.263395] [] ? up_write+0x1a/0x60 [ 35.268817] [] ? SyS_mprotect+0x423/0x640 [ 35.274736] [] do_group_exit+0x111/0x330 [ 35.280455] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 35.287085] [] SyS_exit_group+0x1d/0x20 [ 35.292704] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 35.299270] 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 [ 35.327615] RIP [] page_remove_rmap+0x2e/0x260 [ 35.334147] RSP [ 35.337941] CR2: ffffeafffd3c8008 [ 35.341401] ---[ end trace 05007011c9ea1ff6 ]--- [ 35.346144] Kernel panic - not syncing: Fatal exception [ 35.352274] Dumping ftrace buffer: [ 35.355937] (ftrace buffer empty) [ 35.359766] Kernel Offset: disabled [ 35.363404] Rebooting in 86400 seconds..