[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.512225] 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: [ 27.284360] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 27.618984] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 28.307621] random: sshd: uninitialized urandom read (32 bytes read, 64 bits of entropy available) [ 28.479611] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) Warning: Permanently added '10.128.10.23' (ECDSA) to the list of known hosts. [ 33.981714] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) executing program [ 34.079561] BUG: unable to handle kernel paging request at ffffeafff8e20008 [ 34.086945] IP: [] page_remove_rmap+0x2e/0x260 [ 34.093219] PGD 0 [ 34.095476] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.100730] Dumping ftrace buffer: [ 34.104255] (ftrace buffer empty) [ 34.107949] Modules linked in: [ 34.111255] CPU: 0 PID: 3839 Comm: syz-executor467 Not tainted 4.4.148-gf057ff9 #81 [ 34.119041] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.128416] task: ffff8800ad656000 task.stack: ffff8801d9340000 [ 34.134455] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 34.143244] RSP: 0018:ffff8801d93479c0 EFLAGS: 00010246 [ 34.148679] RAX: dffffc0000000000 RBX: ffffeafff8e20000 RCX: ffffea00071d8000 [ 34.155937] RDX: 1ffffd5fff1c4001 RSI: ffffffff814bc75f RDI: ffffeafff8e20008 [ 34.163204] RBP: ffff8801d93479d0 R08: ffffffff85333170 R09: 0000000000000000 [ 34.170467] R10: 0000000000000001 R11: ffff8800ad656000 R12: 0000000000000001 [ 34.177726] R13: 1ffff1003b268f3e R14: ffff8801cec63810 R15: ffffeafff8e20000 [ 34.184981] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 34.193223] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.199090] CR2: ffffeafff8e20008 CR3: 00000001ced5c000 CR4: 00000000001606f0 [ 34.206392] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.213653] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.221084] Stack: [ 34.223213] ffff8801d9347c50 0000000000000001 ffff8801d9347a78 ffffffff8150a1f3 [ 34.231280] 00003ffe388001a0 00003ffe388001a0 0000000041b58ab3 ffffffff841ef82f [ 34.239358] ffffffff81509ff0 00000000000004f0 ffff8801ca8506e0 ffff8801d9347a40 [ 34.247426] Call Trace: [ 34.250002] [] zap_huge_pmd+0x203/0x510 [ 34.255635] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 34.262211] [] unmap_single_vma+0xea3/0x1240 [ 34.268257] [] ? vm_normal_page+0x230/0x230 [ 34.274217] [] ? __put_single_page+0x60/0x60 [ 34.280295] [] unmap_vmas+0x81/0xd0 [ 34.285585] [] exit_mmap+0x1c9/0x3a0 [ 34.292273] [] ? SyS_remap_file_pages+0x870/0x870 [ 34.298759] [] ? up_write+0x1a/0x60 [ 34.304060] [] mmput+0xf8/0x2d0 [ 34.309007] [] do_exit+0x8d8/0x26b0 [ 34.314308] [] ? file_map_prot_check+0x193/0x310 [ 34.320738] [] ? release_task.part.17+0x1200/0x1200 [ 34.327396] [] ? SyS_mprotect+0x41e/0x640 [ 34.333214] [] ? up_write+0x1a/0x60 [ 34.338481] [] ? SyS_mprotect+0x423/0x640 [ 34.344297] [] do_group_exit+0x111/0x330 [ 34.350033] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 34.356512] [] SyS_exit_group+0x1d/0x20 [ 34.362162] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 34.368765] 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 [ 34.396890] RIP [] page_remove_rmap+0x2e/0x260 [ 34.403258] RSP [ 34.406864] CR2: ffffeafff8e20008 [ 34.410317] ---[ end trace 8431bff65ee7b6a5 ]--- [ 34.415095] Kernel panic - not syncing: Fatal exception [ 34.421152] Dumping ftrace buffer: [ 34.424726] (ftrace buffer empty) [ 34.428453] Kernel Offset: disabled [ 34.432067] Rebooting in 86400 seconds..