[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.538717] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 21.378770] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 21.586802] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.296262] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) [ 22.468264] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) Warning: Permanently added '10.128.0.44' (ECDSA) to the list of known hosts. [ 28.168017] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) executing program [ 28.261812] BUG: unable to handle kernel paging request at ffffeafff8ca0008 [ 28.269167] IP: [] page_remove_rmap+0x2e/0x260 [ 28.275475] PGD 0 [ 28.277741] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.282686] Dumping ftrace buffer: [ 28.286203] (ftrace buffer empty) [ 28.289890] Modules linked in: [ 28.293179] CPU: 1 PID: 3731 Comm: syz-executor498 Not tainted 4.4.150-g5541782 #83 [ 28.300949] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.310295] task: ffff8801ccfb4800 task.stack: ffff8801cc8f0000 [ 28.316328] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 28.325013] RSP: 0018:ffff8801cc8f79c0 EFLAGS: 00010246 [ 28.330438] RAX: dffffc0000000000 RBX: ffffeafff8ca0000 RCX: 0000000000000000 [ 28.337684] RDX: 1ffffd5fff194001 RSI: ffffffff814bceaf RDI: ffffeafff8ca0008 [ 28.344929] RBP: ffff8801cc8f79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 28.352172] R10: 0000000000000001 R11: ffff8801ccfb4800 R12: 0000000000000001 [ 28.359417] R13: 1ffff1003991ef3e R14: ffff8801d22c3800 R15: ffffeafff8ca0000 [ 28.366662] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.374880] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.380739] CR2: ffffeafff8ca0008 CR3: 00000001d22c1000 CR4: 00000000001606f0 [ 28.388027] Stack: [ 28.390152] ffff8801cc8f7c50 0000000000000001 ffff8801cc8f7a78 ffffffff8150ad13 [ 28.398157] 00003ffe328001e0 00003ffe328001e0 0000000041b58ab3 ffffffff841ef837 [ 28.406163] ffffffff8150ab10 00000000000004f0 ffff8800b23e1688 ffff8801cc8f7a40 [ 28.414168] Call Trace: [ 28.416756] [] zap_huge_pmd+0x203/0x510 [ 28.422368] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 28.428968] [] unmap_single_vma+0xea3/0x1240 [ 28.435016] [] ? vm_normal_page+0x280/0x280 [ 28.440971] [] ? __put_single_page+0x60/0x60 [ 28.447019] [] unmap_vmas+0x81/0xd0 [ 28.452273] [] exit_mmap+0x1c9/0x3a0 [ 28.457877] [] ? SyS_remap_file_pages+0x870/0x870 [ 28.464867] [] ? up_write+0x1a/0x60 [ 28.470127] [] mmput+0xf8/0x2d0 [ 28.475030] [] do_exit+0x8d8/0x26b0 [ 28.480281] [] ? file_map_prot_check+0x193/0x310 [ 28.486660] [] ? release_task.part.17+0x1200/0x1200 [ 28.493301] [] ? SyS_mprotect+0x41e/0x640 [ 28.499075] [] ? up_write+0x1a/0x60 [ 28.504328] [] ? SyS_mprotect+0x423/0x640 [ 28.510099] [] do_group_exit+0x111/0x330 [ 28.515816] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.522284] [] SyS_exit_group+0x1d/0x20 [ 28.527882] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 28.534432] Code: e5 41 54 53 48 89 fb e8 31 76 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 03 76 e9 ff f0 83 43 18 ff 78 [ 28.561455] RIP [] page_remove_rmap+0x2e/0x260 [ 28.567985] RSP [ 28.571599] CR2: ffffeafff8ca0008 [ 28.575025] ---[ end trace 1af563c9af0b3cde ]--- [ 28.579752] Kernel panic - not syncing: Fatal exception [ 28.585386] Dumping ftrace buffer: [ 28.588907] (ftrace buffer empty) [ 28.592592] Kernel Offset: disabled [ 28.596190] Rebooting in 86400 seconds..